Patent application number | Description | Published |
20090067009 | IMAGE READING APPARATUS AND IMAGE PROCESS METHOD - Disclosed is an image reading apparatus which reads images in a front side and a back side of a document by passing the document through the image reading apparatus once including a first reading section to read the front side of the document, a second reading section to read the back side of the document and an image process section to calculate a first standard value for carrying out a first shading correction to the first reading section and a second standard value for carrying out a second shading correction to the second reading section, respectively, and to carry out the first shading correction to a first image data read by the first reading section based on the calculated first standard value and to carry out the second shading correction to a second image data read by the second reading section based on the calculated second standard value. | 03-12-2009 |
20110149009 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus forms a pattern image on a sheet by irradiating a photosensitive body with laser lights emitted from first to eighth laser light sources based on timing set in a displaying/setting section. As the pattern image, a combined pattern image in which a plurality of combined images are arranged continuously in the sub scanning direction, in each of which combined images two first line images are arranged apart from each other in the main scanning direction, and the second line image is arranged therebetween. | 06-23-2011 |
20120020584 | IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD - An image processing apparatus including: a determining processing section which binarizes a pixel value of a target pixel using a threshold; a calculation section which calculates feedback values by multiplying binarized pixel values of adjacent processed pixels by a feedback coefficient; a addition section which adds the feedback values to the pixel value of the target pixel before binarization; a diffusion section which diffuses a difference between the binarized pixel value and the unadded pixel value as an error to adjacent unprocessed pixels; and a subtraction section which subtracts the error from the unadded pixel value of the target pixel, wherein when all pixel values of processed pixels are 0 and an output value of the target pixel is a maximum value, it is determined that the target pixel is an isolated point and an output value of an adjacent pixel is set to a forced output value excluding 0. | 01-26-2012 |
20120162674 | IMAGE PROCESSING APPARATUS USING THRESHOLD MATRIX OF RESOLUTION HIGHER THAN RESOLUTION OF INPUT IMAGE - Disclosed is an image processing apparatus which uses a threshold matrix of a resolution higher than a resolution of an input image, the image processing apparatus including: a screen processing section which performs screen processing on an input image which is input; a matrix storage section which stores a threshold matrix of a resolution higher than a resolution of the input image; a threshold obtaining section which obtains a new threshold corresponding to each pixel of the input image based on a threshold of each cell composing the threshold matrix, wherein the screen processing section compares the pixel value of each pixel of the input image with the new threshold corresponding to each pixel of the input image obtained by the threshold obtaining section and generates a multivalue output image. | 06-28-2012 |
20120176630 | IMAGE PROCESSOR AND IMAGE FORMING APPARATUS - Provided is an image processor obtaining image data divided in packing units, comprising: a parallel processing unit performing an image conversion processing in parallel on the pixel data arranged in a sub scan direction in the packing unit, based on the obtained pixel data and the intermediate value for the pixel data, to calculate an output value after the conversion of the pixel data and an index value; an intermediate value calculating unit calculating an intermediate value based on the respective index values calculated by the parallel processing units regarding pixels within a predetermined relative position range; and a first retention unit for delaying the start of the image conversion processing to one pixel data for a delay period set to be equal to or longer than a period required for obtaining the one pixel data and calculating the intermediate value for the one pixel data. | 07-12-2012 |
20120200868 | IMAGE FORMING APPARATUS AND IMAGE QUALITY ADJUSTMENT METHOD - Disclosed is an image forming apparatus including: an image forming section which forms an image on paper; a plurality of image reading sections each of which reads the image formed on the paper, and is connectable to the image forming apparatus; a storage section which stores connection information on a connection state between each of the image reading sections and the image forming apparatus; and a control section which selects a test image reading section from among the image reading sections based on the connection information, makes the selected test image reading section read a test image formed by the image forming section, and performs image quality adjustment based on the read test image. | 08-09-2012 |
20120257840 | IMAGE PROCESSING APPARATUS INCLUDING ERROR DIFFUSION PROCESSING WHICH ADDS GREEN NOISE CHARACTERISTICS, IMAGE PROCESSING METHOD INCLUDING ERROR DIFFUSION PROCESSING WHICH ADDS GREEN NOISE CHARACTERISTICS AND A COMPUTER READABLE STORAGE MEDIUM STORING PROGRAM THEREOF - An image processing apparatus including an input unit which inputs a pixel value of a multi-level notice pixel, a first add unit which acids an error value to the input value, a second add unit which adds a green noise value to the input value, a threshold processing unit which outputs an binarized output values a green noise calculation unit which calculates the green noise value, a subtract unit which calculates an error value due to binarization, an error diffusion unit which diffuses the calculated error value to an untreated pixel which is not yet binarized and a correction processing unit which adds a positive first offset to the error value to perform a correction and outputs the corrected error value to the first add unit. | 10-11-2012 |
20130010339 | THRESHOLD MATRIX GENERATION DEVICE AND METHOD FOR GENERATING THRESHOLD MATRIX FOR GENERATING THRESHOLD MATRIX OF PREDETERMINED SIZE USED FOR HALFTONE PROCESSING OF MULTITONE IMAGE DATA USING DITHERING METHOD - A threshold generation device sets a ratio of a length along a main scanning direction to a length along a sub-direction based on a relation between image reproducibility in the main scanning direction and image reproducibility in the sub-direction of an image processing device for forming an image on a paper based on an image data obtained by the halftone processing. The device determines spatial frequency characteristics having a domain of an ellipse shape having set major axis and minor axis as peak values. The device sets a threshold value of each pixel of the threshold matrix in accordance with the determined spatial frequency characteristics. | 01-10-2013 |
20130285992 | IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD TO PERFORM SCREEN PROCESS ON IMAGE DATA OF A PLURALITY OF COLORS USING THRESHOLD MATRIX FOR EACH COLOR - An image processing apparatus to perform a screen process on color image data using threshold matrices includes an address calculation section, threshold processor and shift section. The address calculation section calculates an address in the threshold matrix. The threshold processor acquires a threshold by the address, and performs an n-valued process (n≧2) on a pixel value using the threshold. The shift section divides the image data into blocks in units of the threshold matrix, determines shift amounts for each block, and shifts the address. The threshold processor acquires a threshold by an address after the shift for at least one color, and performs the n-valued process using the threshold. The threshold matrix for a color for which the address is shifted has a screen ruling with a lower number of lines than the address is not shifted. | 10-31-2013 |