Class / Patent application number | Description | Number of patent applications / Date published |
358465000 | Picture signal thresholding | 9 |
20080291506 | Analog front-end circuit and electronic instrument - An analog front-end circuit includes an analog processing circuit, an A/D converter, a calculation circuit, and a target register in which a black level target value is set. The analog processing circuit includes a clamp circuit that performs a line clamp operation, and an offset adjustment circuit. The calculation circuit monitors an A/D-converted value of a black reference pixel after the line clamp operation in a black level monitor period after a line clamp period but before an effective pixel output period, and performs a black level error correction process by writing an offset adjustment value that causes the A/D-converted value to be set at the black level target value into the offset adjustment register. | 11-27-2008 |
20090080034 | DATA PROCESSING DEVICE, IMAGE FORMING DEVICE, SYSTEM, AND A COMPUTER-READABLE RECORDING MEDIUM - There is provided a data processing device comprising: an obtaining unit that obtains a first image data set, a second image data set, and a property data set, the second image data set being generated by reading an image which is formed on a recording medium in accordance with the first image data set by an image forming device, and the property data set indicating a property of the recording medium; and a specifying unit that determines a threshold for a density difference between the first image data set and the second image data set, depending on the property data set, and specifies, as an error area, an area where the density difference between images expressed by the first and second image data sets is equal to or greater than the threshold. | 03-26-2009 |
20120206776 | IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND PROGRAM - An apparatus includes an input unit configured to read a document and input image data, a division unit configured to divide the image data into a margin area and a print information area, an acquisition unit configured to count a number of pixels having a gradation value greater than a first threshold value in each divided area, and acquire the number of counted pixels per unit area, and a determination unit configured to determine that the document is white paper if a difference of two acquired pixel numbers per unit area is smaller than a second threshold value. | 08-16-2012 |
20130003139 | Image Reading Device - An image reading device includes a holding surface that holds a first document, a conveyor unit that conveys a second document along a conveying path, a first contact surface that contacts a first side of the second document when the conveyor unit conveys the second document, a second contact surface that contacts a second side of the second document when the conveyor unit conveys the second document, and reading units. A first reading unit reads an image on a side of the first document held by the holding surface, and reads an image on the first side of the second document being conveyed by the conveyor unit. A second reading unit is disposed above the second contact surface and reads an image on the second side of the second document. The second reading unit is disposed not to overlap the first reading unit in an up down direction. | 01-03-2013 |
20140036320 | IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD - An image processing apparatus according to an aspect of the present disclosure includes: an identifying area dividing unit configured to divide the image data into plural identifying areas; a binarization processing unit configured to perform a binarization process for the identifying areas with respective binarization threshold values preset for the identifying areas; a black pixel number identifying unit configured to identify whether or not the numbers of pixels with a density value of black in the respective identifying area exceed respective number threshold values preset for the identifying areas; and a blank sheet identifying unit configured to identify that the image data is image data of a blank sheet if the black pixel number identifying unit identifies that none of the numbers of pixels with the density value of black in the respective identifying areas exceeds the number threshold value. | 02-06-2014 |
20140118798 | Image Scanner and Image Scanning Method - An image scanner includes a transparent plate, a scanning device, a driving device, a positioning member, a light absorbing portion and a white reference portion. The transparent plate has an original placing surface. The scanning device irradiates an original with light by means of a light source and scans reflected light from the original. The driving device reciprocates the scanning device along the transparent plate. The positioning member positions the original placed on the original placing surface of the transparent plate. The light absorbing portion, which is disposed on the original placing surface side of the positioning member and at substantially a central portion of the positioning member in moving directions of the scanning device, absorbs ambient light entering to the original placing surface side of the positioning member through the transparent plate. The white reference portion is provided to the original placing surface side of the positioning member. | 05-01-2014 |
358466000 | Variable thresholding technique | 3 |
20090091802 | Local Image Descriptors Using Linear Discriminant Embedding - To render the comparison of image patches more efficient, the data of an image patch can be projected into a smaller-dimensioned subspace, resulting in a descriptor of the image patch. The projection into the descriptor subspace is known as a linear discriminant embedding, and can be performed with reference to a linear discriminant embedding matrix. The linear discriminant embedding matrix can be constructed from projection vectors that maximize those elements that are shared by matching image patches or that are used to distinguish non-matching image patches, while also minimizing those elements that are common to non-matching image patches or that distinguish matching image patches. The determination of such projection vectors can be limited such that only orthogonal vectors comprise the linear discriminant embedding matrix. The determination of the linear discriminant embedding matrix can likewise be constrained to avoid overfitting to training data. | 04-09-2009 |
20090161172 | IMAGE PROCESSING DEVICE - An image processing device has a main unit, a storage unit, a first processing unit, a second processing unit, a first determination unit, and a first replacement unit. The storage unit is provided in the main unit that stores a color image having ground color and different color from the ground color, the color image being formed by color-pixels including a ground color pixel and a different color pixel, the ground color pixel having the ground color, the different color pixel having the different color. The first processing unit scales down the color image to produce a first gray-scale image which is simply represented by brightness having a plurality of brightness values, the first gray-scale image being formed by first gray-scale pixels. The second processing unit determines the brightness value of each of the color pixels to produce a histogram showing a distribution of the color pixels with respect to the brightness. The first determination unit determines a first threshold level based on the histogram to distinguish the ground color pixel from the different color pixel. The first replacement unit compares the brightness value of at least one of the color pixels with the first threshold level to detect the ground color pixel, the first replacement unit replacing the detected ground color pixel with a white color pixel to produce a processed color image, the white color pixel having white color. | 06-25-2009 |
20090323132 | IMAGE PROCESSING APPARATUS, METHOD OF IMAGE PROCESSING, COMPUTER PROGRAM, AND STORAGE MEDIUM - Input image data is converted into a brightness component to obtain a difference between the brightness component and a threshold. A count variation is determined based on the obtained difference, and the counter is used to follow up and change the threshold. The threshold obtained by the follow-up and change is used to execute a background color removal process in each pixel by executing a signal conversion process. | 12-31-2009 |