| Peking University Patent applications |
| Patent application number | Title | Published |
|---|
| 20120128566 | METHOD FOR PRODUCING FLUORAPATITE AND ITS APPLICATION - A method for producing fluorapatite and its application are disclosed in the present invention, which relates to the field of biomaterials for dental reparation. The present invention comprises steps of mixing tetracalcium phosphate, calcium hydrogen phosphate, and sodium fluoride to form a mixture and adding the mixture into water, or mixing tetracalcium phosphate and ammonium fluoride to form a mixture and then adding the mixture into a phosphoric acid/water solution, blending the above two sets of materials respectively to form cement-like substances; and solidifying the cement-like substances at a temperatures of 35° C. to 38° C. and a moisture of 100% for 1-3 days to produce fluorapatite. The synthesized fluorapatite has a similar chemical composition with tooth enamel, thus, the fluorapatite produced by the invention can be combined with the natural enamel directly, so as to repair enamel defects caused by caries, especially severe enamel defects (deep caries). The synthesized fluorapatite has a stoichiometric amount of apatite structure, and has high chemical stability (low solubility) in a physiological condition of human body fluid. In acidic conditions (when bacteria exist) the fluorapatite releases fluorine ion slowly, so it further has an ability to prevent dental caries. | 05-24-2012 |
| 20120115297 | METHOD FOR FABRICATING A TUNNELING FIELD-EFFECT TRANSISTOR - The present invention discloses a method for self-alignedly fabricating tunneling field-effect transistor (TFET) based on planar process, thereby lowering requirements on a photolithography process for fabricating the planar TFET. In the method, the source region and the drain region of the TFET are not directly defined by photolithography; rather, they are defined by another dielectric film which locates over an active region and on both sides of the gate and which is different from the dielectric film that defines the channel region. The influence due to the alignment deviation among three times of photolithography process for defining the channel region, the source and the drain regions may be eliminated by selectively removing the dielectric film over the source and drain regions by wet etching. Therefore, a planar TFET may be fabricated self-alignedly based on this process, thereby the rigid requirements on the alignment deviation of the photolithography during the fabrication procedure of a planar TFET is alleviated, which facilitates to fabricate a planar TFET device with stable and reliable characteristics. | 05-10-2012 |
| 20120113726 | FLASH MEMORY AND FABRICATION METHOD AND OPERATION METHOD FOR THE SAME - The present invention discloses a flash memory and the fabrication method and the operation method for the same. The flash memory comprises two memory cells of vertical channels, wherein a lightly-doped N type (or P type) silicon is used as a substrate; a P+ region (or an N+ region) is provided on each of the both ends of the silicon surface, and two channel regions perpendicular to the surface are provided therebetween; an N+ region (or a P+ region) shared by two channels is provided over the channels; a tunneling oxide layer, a polysilicon floating gate, a block oxide layer and a polysilicon control gate are provided sequentially on the outer sides of each channel from inside to outside; and the polysilicon floating gate and the polysilicon control gate are isolated from the P+ region by a sidewall oxide layer. The whole device is a two-bit TFET type flash memory with vertical channels which has better compatibility with prior-art standard CMOS process. As compared with a conventional MOSFET-based flash memory, the flash memory according to the present invention possesses various advantages such as high programming efficiency, low power consumption, effective inhibition of punch-through effect, and high density, etc. | 05-10-2012 |
| 20120099381 | EMBEDDED NON-VOLATILE MEMORY CELL, OPERATION METHOD AND MEMORY ARRAY THEREOF - The present invention discloses an embedded non-volatile memory cell, an operation method and a memory array thereof. The method includes using a gate of a selection transistor as a floating gate of a memory, and using a source electrode and a drain electrode of the selection transistor as a source electrode and a drain electrode of the memory; and then changing a threshold of the device by varying the electrode voltages, thereby realizing a storage and change of information. The invention has advantages of a small area, a low operating voltage, high operating speed and high reliability. | 04-26-2012 |
| 20120092676 | ALL-FIBER INTERFEROMETRIC FIBER OPTIC GYROSCOPE FOR INHIBITING ZERO DRIFT - A method for inhibiting zero drift of an all-fiber interferometric fiber optic gyroscope and a corresponding all-fiber interferometric fiber optic gyroscope are disclosed. The method comprises: reversing the polarity of an AC voltage applied to a PZT piezoelectric ceramic phase modulator according to a predetermined half-cycle time period, and making half of the difference between output rotation rates of the gyroscope in two adjacent half-cycle time periods as the output rotation rate of the gyroscope in a cycle. A phase reversal switch and a DSP chip are added to the all-fiber interferometric fiber optic gyroscope. The phase reversal switch is used for controlling the polarity of the AC voltage, and the DSP chip is used for outputting a square wave signal to control the phase reversal switch and for calculating the output rotation rate of the gyroscope according to the output signal of a demodulation/amplifier circuit. | 04-19-2012 |
| 20120088775 | Pyrazolo-[1,5-a]-Pyrimidones Derivatives and Pharmaceutical Compositions and Uses Thereof - The present invention provides new pyrazolo-[1,5- | 04-12-2012 |
| 20120044864 | DATA TRANSMISSION IN MOBILE AD-HOC NETWORK - Techniques are generally described related to a mobile ad-hoc network. One example method for transmitting data from a source node to a destination node in a mobile ad-hoc network may include receiving a route reply packet from a first node by a second node; identifying the route reply packet as an overheard route reply packet by the second node; adding a first routing entry in a routing table of the second node and the first routing entry being associated with the overheard route reply packet by the second node; broadcasting a routing entry added message associated with the first routing entry by the second node; receiving data transmitted from a third node and the data being transmitted by the third node responsive to the routing entry added message by the second node; and sending data received from the third node towards the destination node via an active route established based on the first routing entry in the routing table of the second node by the second node. | 02-23-2012 |
| 20120027300 | CONNECTIVITY SIMILARITY BASED GRAPH LEARNING FOR INTERACTIVE MULTI-LABEL IMAGE SEGMENTATION - A system and method of connectivity-based image processing to identify and extract objects in image data. Variations on the method may include iterative local smoothing operations and various algorithmic solutions to improve real-time processing. Variations may also include object extraction processes based on user-provided information about an object in an image. | 02-02-2012 |
| 20120018775 | ELECTROSTATIC DISCHARGE PROTECTION DEVICE AND METHOD FOR FABRICATING THE SAME - The present invention provides an ESD protection device comprising a SCR structure that is a transverse PNPN structure formed by performing a P-type implantation and an N-type implantation in an N-well and a P-well on a silicon substrate, respectively, wherein a P-type doped region in the N-well is used as an anode, and N-type doped region in the P-well is used as a cathode, characterized in that, N-type dopants are implanted into the N-well to form one lead-out terminal of a resistor, P-type dopants are implanted into the P-well to form another lead-out terminal for the resistor, and the two leading-out terminals are connected by the resistor. | 01-26-2012 |
| 20120013912 | ALL-FIBER INTERFEROMETRIC FIBER OPTIC GYROSCOPE HAVING A MINIMUM RECIPROCAL CONFIGURATION - An all-fiber interferometric fiber optic gyroscope having a minimum reciprocal configuration is described. The gyroscope comprises a polarized light source, a light detector, a light source coupler, a fiber optic loop coupler, and a polarization maintaining fiber optic loop. A first port of the light source coupler is counter-axially coupled to an output end of the polarized light source, and a second port of the light source coupler on the same side as the first port is coupled to the light detector. A third port on the other side of the light source coupler is counter-axially coupled to the fiber optic loop coupler, and the fiber optic loop coupler is counter-axially coupled to the polarization maintaining fiber optic loop. The light source splits the input polarized light and polarizes the optical signal propagated along a transmission arm alone, where the first and third ports are on the same transmission arm. | 01-19-2012 |
| 20110315014 | METHOD FOR REMOVING SOx FROM GAS USING POLYETHYLENE GLYCOL - A method for removing SO | 12-29-2011 |
| 20110279872 | Image Processing Method and Apparatus - An image processing method includes: generating a stochastic screening dither matrix (S | 11-17-2011 |
| 20110262031 | CONCAVE SURFACE MODELING IN IMAGE-BASED VISUAL HULL - Apparatus and methods disclosed herein provide for a set of reference images obtained from a camera and a reference image obtained from a viewpoint to capture an entire concave region of an object; a silhouette processing module for obtaining a silhouette image of the concave region of the object; and a virtual-image synthesis module connected to the silhouette processing module for synthesizing a virtual inside-out image of the concave region from the computed silhouette images and for generating a visual hull of the object having the concave region. | 10-27-2011 |
| 20110191355 | METHOD FOR MONITORING ABNORMAL STATE OF INTERNET INFORMATION - A method for monitoring abnormal state of Internet information by monitoring the change of hot words frequency in the Internet information. The method includes the following steps: 1) obtaining the current date word frequency data of common words appearing in the current date web pages; 2) combining with the hot words dictionary that the user focuses on to determine the current date keywords set of the Internet information; 3) determining the weight of each current date keyword; 4) determining the abnormal threshold of the current date keywords; 5) detecting the abnormal level of the current date keywords to determine the current date hot Internet information. The present invention calculates the abnormal level of keywords by monitoring the change of hot words frequency in the Internet information, predicts and gives alarm for the abnormal level of hot words frequency change, which makes the Internet information user react at the first moment. | 08-04-2011 |
| 20110164082 | Pulse Width Control Device and Method, Inkjet Printing Device Using the Device - Disclosed is a pulse width control device, including: a first monostable multivibrator, for receiving a synchronization pulse, and generating a negative pulse whose width is a first preset threshold; a second monostable multivibrator, for receiving the synchronization pulse, and generating a positive pulse whose width is a second preset threshold; an inverter, for receiving the synchronization pulse, and inverting the synchronization pulse, and outputting an inverted synchronization pulse; and a flip-flop, for receiving the negative pulse, the positive pulse and the inverted synchronization pulse, and generating a synchronization pulse with a width between the first threshold and the second threshold. | 07-07-2011 |
| 20110090522 | AUTOMATIC TRAPPING METHOD AND SYSTEM - An automatic trapping method and system is used for packaging printing. The method includes translating trapping objects into simple color blocks, scanning all of the blocks and attaining trapping boundaries, determining whether the color blocks on both sides of the trapping boundaries meet the trapping rule depending on the ink dots percentage and luminance, connecting trapping boundaries by analyzing regions, creating trapping zone and filling ink into the zone and reducing color. | 04-21-2011 |
| 20110087959 | METHOD AND DEVICE FOR PROCESSING THE STRUCTURE OF A LAYOUT FILE - Disclosed are a method and a device for processing the structure of a layout file, comprising: obtaining document content structure information and/or document layout exhibition information of the layout file; dividing document contents of the layout file into content blocks according to the document content structure information and/or the document layout exhibition information; and creating document flow information of the layout file according to the divided content blocks. | 04-14-2011 |
| 20110084739 | Methods and Devices for Generating Trapezoidal Fire Pulses - The present application discloses trapezoidal fire pulse generating methods and devices. According to the devices and methods of the present application, the voltage value of the positive DC control voltage signal, the voltage value of the negative DC control voltage signal, the voltage value of the rise-time DC control voltage signal and a fall-time DC control voltage signal can be determined according to the parameter values of a trapezoidal fire pulse required to be output. Thus, corresponding DC control voltage signals can be generated. Further, the positive DC control voltage signal and the negative DC control voltage signal can be modulated to a square-wave pulse. Then, the rise-time DC control voltage signal, the fall-time DC control voltage signal and the square-wave pulse can be input to a inverse integrator so as to generate a trapezoidal fire pulse. Since there are specific quantitative relations between the rise time and fall time of the trapezoidal fire pulse and the voltage values of the rise-time and fall-time DC control voltage signals, the corresponding rise time and fall time of the trapezoidal fire pulses can be accurately controlled and adjusted so that the output trapezoidal fire pulses can be more stable and accurate. | 04-14-2011 |
| 20110009342 | USES OF PDCD5 POLYPEPTIDE FOR TUMOR CHEMOTHERAPY AND ORGAN PROTECTION - The invention relates to the use of PDCD5 polypeptides or polynucleotides that code the PDCD5 polypeptides in preparation of sensitizers of chemotherapeutic agents for cancers. The invention also relates to the use of PDCD5 polypeptides or polynucleotides that code the PDCD5 polypeptides to protect normal or diseased tissues or organs from damage or further damage, and to pharmaceutical combinations including chemotherapeutic agents and PDCD5 polypeptides or polynucleotides that code the PDCD5 polypeptides in an amount effective for sensitization. Preferably, the pharmaceutical agents are selected from antibiotic and anti-metabolic agents or any combination thereof. | 01-13-2011 |
| 20100290521 | Method and Device For Selecting Best Mode Of Intra Predictive Coding For Video Coding - A method for selecting the best mode of intra prediction coding for video coding applied in video coding and decoding field is provided. The method includes: constructing a rate distortion cost function based on an estimated rate to be encoded; computing the rate distortion costs for all predictive modes by using the constructed function, and selecting the predictive mode with the minimum rate distortion cost as the best mode of intra prediction coding according to the computing result. Accordingly, a device for selecting the best mode of intra prediction coding for video coding is provided. By the method, the selected mode is closer to the best mode selected by original rate distortion optimization model, thereby the need to code every block actually in the process of rate distortion optimization is effectively avoided. | 11-18-2010 |
| 20100218239 | Digital Content Counting System and Method - A digital content counting system and a method thereof are provided for achieving the credible transaction counting mechanism established between the owner of copyrights and the seller, to make the owner of copyrights and the seller collectively confirm the transaction information of the digital contents. The system comprises a sale subsystem, an authorization service subsystem and a transaction clearing subsystem; the sale subsystem and the authorization service subsystem authenticate each other; the transaction clearing subsystem and the authorization service subsystem authenticate each other; the transaction clearing subsystem authenticates the sale subsystem; the sale subsystem generates transaction request information according to a purchase list, sends the transaction request information to the authenticated authorization service subsystem, and records transaction success information; after receiving and confirming the transaction request information, the authorization service subsystem sends transaction success information to a client device, the sale subsystem and authenticated transaction clearing subsystem, sends an approach for obtaining an authorization file to the client device, records the transaction request information, and issues the authorization file; the transaction clearing subsystem records the transaction success information. | 08-26-2010 |
| 20100115356 | METHODS AND DEVICES FOR GENERATING DOTS OF AN IMAGE BY USING TWO ERROR ROW MEMORIES - Disclosed are devices and methods for generating dots of an image by using two error row memories, which are capable of reading and writing data synchronously. A device disclosed comprises: a buffer memory A; a buffer memory B; and a memory controller. The memory controller may comprise a read-write control circuit for the buffer memory A, a read-write control circuit for the buffer memory B, and a buffer memory selection circuit. The buffer memory selection circuit is used to generate a read-write selection signal for the buffer memory A and the buffer memory B. The read-write control circuit for the buffer memory A is connected to the buffer memory A and used to implement a read operation or a write operation on the buffer memory A according to the read-write selection signal. The read-write control circuit for the buffer memory B is connected to the buffer memory B and used to implement a read operation or a write operation on the buffer memory B according to the read-write selection signal. The devices and methods are capable of implementing read and write operations on memories synchronously, which can improve the speed of error diffusion during use. | 05-06-2010 |
| 20100097390 | Methods And Devices For Processing A Raster Image - A raster image process method and device, for solving an issue existed in the current technique that it is unable to distinguish between the white color filled in a raster image when constructing the raster image and the white color in an image object of a page description filled in the raster image afterwards. The method includes: the raster image is constructed and the white color is filled in the raster image; a process of changing a color for the white color in an image object described in a page is carried out, and the image object is filled into the raster image. Thereby the white color filled in the raster image when constructing the raster image and the white color in an image object of a page description filled in the raster image afterwards can be distinguished. | 04-22-2010 |
| 20100093090 | METHOD AND KIT FOR EFFICIENT REPROGRAMMING OF SOMATIC CELLS - The present invention relates to method or kit for efficient reprogramming of somatic cells. | 04-15-2010 |
| 20100090293 | SELF-ALIGNED NANO FIELD-EFFECT TRANSISTOR AND ITS FABRICATION - Our invention discloses a self-aligned-gate structure for nano FET and its fabrication method. One dimension semiconductor material is used as conductive channel, whose two terminals are source and drain electrodes. Gate dielectric grown by ALD covers the area between source electrode and drain electrode, opposite sidewalls of source electrode and drain electrode, and part of upper source electrode and drain electrode. Gate electrode is deposited on gate dielectric by evaporation or sputtering. Total thickness of gate dielectric and electrode must less than source electrode or drain electrode. Gate electrode between source electrode and drain electrode is electrically separated from source and drain electrode by gate dielectric. The fabrication process of this self-aligned structure is simple, stable, and has high degree of freedom. Nearly the whole conductive channel between source electrode and drain electrode is covered by gate electrode, so the control efficiency of the gate over the conductive channel, described as transconductance, can be greatly enhanced. Additionally, there is no restriction on material of gate dielectric or electrode, so the devices' threshold voltage can be adjusted to satisfy the requirements of large scale integrated circuit. | 04-15-2010 |
| 20100086130 | Digital Content Rights Management Method and System - A digital content rights management method and system belongs to the digital content rights management technique field. The method of the invention includes the steps: registering the system, generating the time stamp, verifying the time stamp when the system starts up, acquiring the certificate, verifying the time before accessing the digital content. The system of the invention comprises a device for accessing the digital content and a server, wherein the device for accessing the digital content comprises: a registering module, a time stamp generating module, a time stamp verification module, a certificate of authorization acquiring module, and a time verification module. The method and system have solved the problem that the digital content can still be used beyond the time limit. | 04-08-2010 |
| 20100037949 | DYE SENSITIZED SOLAR CELL AND A WORKING ELECTRODE THEREOF - A dye sensitized solar cell contains a working electrode including a filamentous conductive substrate and a sensitized semi-conductor film, in which the sensitized semi-conductor film has a porous film structure, which is made of semi-conductor particles of different sizes absorbed with sensitizing dye molecules. The sensitized semi-conductor film is coated over the outer surface of the filamentous conductive substrate. The filamentous conductive substrate has rich source and small volume, and is easy to be deformed, convenient for processing, and assessable for series-parallel connection. Therefore, the solar cell is suitable for narrow and irregular-shaped space that needs specific driving power. | 02-18-2010 |
| 20090257076 | Method of document protection - This invention relates to a method for preventing a copy of document, belonging to a technical field of entire copy protection of document. In the prior art, for some important documents, specially the secret ones, the reproduction of this kind of document is usually prohibited by its owner because of the security. But the technique in the prior art can not solve the problem of preventing unauthorized reproduction. The method of the present invention is intended to embed a shading pattern under the original image of anti-copy document by an application program installed in the copy device, and decide whether the document can be copied legally or not. By the method of present invention, it is possible to detect the watermark information of the anti-copy document accurately and quickly, and prevent the reproduction of the anti-copy document thoroughly. Moreover, an additional memory space is no need. | 10-15-2009 |
| 20090214411 | METHOD OF SELECTIVELY ELIMINATING METALLIC CARBON NANOTUBES, SEMICONDUCTING CARBON NANOTUBES AND PREPARATION METHOD THEREOF USING THE SAME - Metallic carbon nanotubes (“CNTs”) may be selectively eliminated and semiconducting CNTs may be prepared using light-irradiation. The light provided by the light-irradiation may have a wavelength of about 180 nm to about 11 μm. Further, the light may have an intensity of about 30 mW/cm | 08-27-2009 |
| 20090197282 | METHOD AND SYSTEM FOR SCREENING THE RECEPTOR-LIGAND BINDING IN LIVE CELL - The invention relates to methods and system for detecting ligand binding to membrane receptors and endocytosis. A method for detecting ligand binding to a membrane receptor includes the steps of: incubating the cell with a dye and a ligand; and detecting dye-containing endocytic vesicles in the cell. A system for screening ligand binding to membrane receptors includes an automatic liquid handling device; an x-y stage for positioning a plate; a microscope configured to image endocytic vesicles of a cell; a software for automatic analysis of FM spots (endocytic vesicles); and a control unit configured to control the movement of the x-y stage and the microscope. | 08-06-2009 |
| 20090155879 | RECONSTITUTION OF 5-ENOLPYRUVYLSHIKIMATE-3-PHOSPHATE SYNTHASE ACTIVITY BY FRAGMENT COMPLEMENTATION - The present invention relates to protein fragments of 5-enolpyruvylshikimate-3-phosphate synthase, which are selected from the protein fragment pairs of EPSPS, two such protein fragments can make up full length EPSPS and reconstitute EPSPS activities by complementation without help of any joint structure. The present invention also relates to nucleic acid molecules encoding the protein fragments, expression vectors and cells comprising such nucleic acid molecules. The present invention also relates to methods for reconstituting EPSPS activities by using the fragments or the nucleic acid molecules or the expression vectors of the present invention, as well as methods for dividing the protein fragments of the present invention. | 06-18-2009 |
| 20090123567 | BISBENZISOSELENAZOLONYL DERIVATIVES HAVING ANTINEOPLASTIC, ANTI-INFLAMMATORY AND ANTITHROMBOTIC ACTIVITIES AS WELL AS THEIR USE - The present invention relates to new bisbenzisoselenazolonyl derivatives of the following general formula (I), wherein R is C | 05-14-2009 |
| 20090117204 | BENZOISOSELENAZOLE DERIVATIVES WITH ANTI-INFLAMMATION, ANTIVIRUS AND ANTITHROMBOSIS ACTIVITY AND THEIR USE - The present invention relates to new bisbenzisoselenazolonyl derivatives of the following general formulae (I), (II) or (III) and their pharmaceutically acceptable salts. The inventive derivatives have antineoplastic, anti-inflammatory and antithrombotic activities. | 05-07-2009 |
| 20090080024 | Printing Control Method Capable of Reducing Printing Memory Requirement - The present invention belongs to the field of printing control technology, and is especially one kind of printing control method with reducing printing memory requirement. The available printing technology always needs complicated segment forming gratings in advance and occupying great amount of memory. The printing control method of the present invention includes interpreting the page data as banded intermediate format data, calculating the time for forming grating of each band of the intermediate format data, pre-analyzing the bands with time for forming grating greater than the printing time, and arranging the job of forming grating of the complicated bands in the idle print time as far as possible. The said method can reduce the band number of forming gratings in advance and reduce the printing memory requirement. | 03-26-2009 |
| 20090016629 | Method of Performing Fast Compression and Decompression for Image - The present invention relates to an image compression and decompression method, in particular in the areas of computer image processing and data compression. The currently, the process speed for which JPEG (Joint Photographic Experts Group, a compression standard) is applied, it's not all too satisfactory. One aspect of the present invention is simplify compression process based on particular features of an image, thus achieve the aim of accelerate the processing speed. Apply the process described in the present invention, the processing speed for JPEG compression/decompression would rise, without suffers quality reduction compare to current JPEG compression/decompression method. | 01-15-2009 |
| 20090006838 | Methods for Downloading a Digital Work Automatically Bound with Characteristics of a Portable Device - Disclosed is a method for downloading a digital work automatically bound with characteristics of a portable device, which refers to a technology of digital rights protection using an embodied system. The method achieves convenient and safe binding of digital works for a portable device. A storage space of the portable device stores digital contents and an executable program which is executed automatically after the portable device is connected to a network terminal. By this method, copyright-protected digital contents can be purchased or borrowed, and downloaded to the portable device. | 01-01-2009 |
| 20080297853 | Methods and Apparatus for Embedding and Detecting Digital Watermarks in a Text Document - Disclosed are a method and apparatus for embedding or detecting watermarks in a text, which belong to the field of document protection. The method and apparatus overlay an additional layer of shade in a document for recording a large amount of information from watermarks. The shade comprises the dots arranged under certain rules. Shifts of the dots record each bit string within the watermark. According to the method and apparatus, a large amount of information can be embedded and the watermarks embedded in the shade are dispersed together with the document which can be digitized by a scanner for being detected. | 12-04-2008 |
| 20080286867 | Method of Inducing Embryonic Stem Cells Into Pancreatic Cells - The present invention provided a simple three-step approach based on the combinational induction with activin A, all-trans retinoic acid and, optionally, other maturation factors which are able to induce embryonic stem cells to differentiate into insulin-producing cells. A kit used to induce embryonic stem cells to differentiate into insulin-producing cells was also provided. | 11-20-2008 |
| 20080285085 | Method for Controlling the Shapes of FM-AM Mixed Dots on a Multi-Bit Depth Imaging Apparatus - Disclosed is a method for controlling the shapes of FM-AM mixed halftone dots on the multi-bit depth imaging apparatus. In the prior art, since the reproduction of the shapes of the dots in various gradations is absolutely based on the theory of random error diffusion and is influenced by the dynamic controlling output mechanism for the multi-bit dots, it is hard to assure the controllability of the shapes of the dots in a certain gradation. Based on the prior art, the dynamic statistic algorithm with adjacent output gray levels is introduced to assure the controllability of the shapes of the dots and solve the problem of random change of the shapes of the dots due to the randomicity of the error diffusion. According to the disclosed method, the features of the multi-bit imaging apparatus can be achieved fully in light of the requirements of the dots on the basis of the original method for multi-bit FM-AM mixed screening using error diffusion based on dual-feedback. The effect of FM-AM mixed halftone screening can be achieved under low resolution with controllable shapes of the dots, The problem of granular sensation can be solved during the practical output of the mixed halftone dots so as to assure the smooth effect of the gradations. | 11-20-2008 |
| 20080278765 | Method for Processing Fm-Am Mixed Halftone Images on a Multi-Bit Depth Imaging Apparatus - Disclosed is a method for processing FM-AM mixed halftone images on a multi-bit depth imaging apparatus, which relates to a method for producing halftone dots in the field of image hard copying. In the prior art, since it is hard to avoid the impact of the error diffusion for the output apparatus to control the mixed dots with multi-bit imaging depth based on the error diffusion, the output of the mixed dots with multi-bit imaging depth cannot satisfy requirements of the apparatus. According to the method of the present invention, the dynamic algorithm for controlling the multi-bit mixed dots is used for screening based on the existing mixed screening process using dual-feedback error diffusion. Furthermore, multi-bit halftone images with high quality and rich gradations can be output by the multi-bit depth imaging apparatus. The method of the present invention can solve the phenomenon of sawtooth in the margins of the mixed dots output by the conventional single-bit apparatus and obtain the FM-AM mixed dots with the effect of high resolution and continuous gradations, which are output under low resolution. | 11-13-2008 |
