Ricoh Company, Ltd.

Naoto Shiraishi

Tatsuya Fujii

Masanobu Fukushima

Yasuhiro Izawa

Tatsuya Nakajima

Yoshinori Hayashi

Yutaka Sato

Naoki Miyatake

Sadayuki Iwai

Hisao Shirasawa

Kazunari Tonami

Yuichiro Kanoshima

Kazuo Sakamoto

Yukihiro Imai

Ryo Fukui

Yoshiteru Yamada

Shinji Kobayashi

An information processing apparatus includes circuitry to: divide an image into a first block and a second block; encode the first block using fixed-length coding based on a determination that a first data size is equal to or greater than a threshold, the first data size being a data size for the first block in a case where the first block is encoded using variable-length coding; and encode the first block using variable-length coding based on a determination that the first data size is less than the threshold.

Information processing apparatus, information processing method, and recording medium

An image processing device includes circuitry. The circuitry reads YUV image data for each block of a predetermined size; performs discrete wavelet transform on a Y value of a pixel included in a block to obtain a first transformed Y value; multiplies the first transformed Y value by a coefficient used for inversely transforming the first transformed Y value, to calculate a second transformed Y value; and quantizes a U value and a V value included in the block and the second transformed Y value to generate fixed length encoded data.

Image processing device, image processing method, and recording medium storing image processing program

An encoding apparatus includes circuitry. The circuitry is configured to read predetermined unit image data that is a predetermined plurality of pixel units of image data; generate pixel unit code data obtained by encoding the read predetermined unit image data on a pixel basis; generate predetermined unit code data obtained by encoding the read predetermined unit image data on a predetermined unit basis; compare a code length that is a data amount of the pixel unit code data with a data amount of the predetermined unit image data to make determination; and output the predetermined unit code data in a case where the code length is greater than the data amount of the predetermined unit image data and output the pixel unit code data in a case where the code length is not greater than the data amount, on basis of a result of the determination.

Encoding apparatus, encoding method, and recording medium

A control system controls an image forming unit that includes a charging device, an image bearer to be charged by the charging device, a light-emitting device array including a plurality of light emitting devices, and a driving causing the light emitting devices to emit light to form a latent image on the image bearer. The control system includes a storage unit, a corrector, and a controller. The storage unit is configured to store a light-amount correction value of each of the light emitting devices. The corrector is configured to correct a pixel value of each pixel in image data, based on the light-amount correction value of each light emitting device stored in the storage unit. The controller is configured to control the driver to cause each light emitting device to emit light based on image data for which a pixel value of each pixel has been corrected.

Control system configured to correct variations in optical output of light emitting devices, image forming system, control method, and computer-readable recording medium

An information processing device includes a first memory, a second memory, and a memory control circuit. The first memory stores first information. The second memory stores second information different from the first information. The memory control circuit controls reading and writing of the first information on the first memory and reading and writing of the second information on the second memory. The first information is read and written more frequently than the second information, and takes less time to be read than the second information.

Information processing device, image processing apparatus, and information processing method for high-speed translucency calculation

An image processing device performs: breaking down a drawing command into horizontal line parameters each indicating a drawing parameter on a line-by-line basis; and reading, from a translucent image storage unit configured to store a translucent image including a translucency value indicating a transmission rate of a color value corresponding to pixel for each of a plurality of pixels, the translucency values of pixels corresponding to the horizontal line parameter, and writing color values designated by the horizontal line parameter directly into a color image storage unit configured to store a color image including a color value for each of a plurality of pixels as the color values of the respective pixels corresponding to the horizontal line parameter without reading the color values of the pixels corresponding to the horizontal line parameter from the color image storage unit, when all of the read translucency values indicate transparent.

Image processing apparatus and image processing method of color image

An image processing apparatus includes a control circuit and an image processing circuit. The control circuit divides a target image stored in a memory into predetermined units to generate a plurality of block image, generates rendering determination information for each of the plurality of block images, and stores the rendering determination information in the memory. The rendering determination information indicates whether the block image has a pixel value to be rendered. The image processing circuit acquires the generated rendering determination information for at least one block image of the target image from the memory, acquires, if the rendering determination information indicates that the block image has the pixel value to be rendered, the block image corresponding to the rendering determination information from the memory, and performs image processing on the acquired target image to generate rendering information for rendering the target image.

Image processing apparatus, method of controlling image processing apparatus, and non-transitory recording medium

An image forming apparatus, which includes a first storage, a second storage, and a bus, includes a first controller configured to store first image data based on input image data, in the first storage, when the input image data is input via the bus; a second controller configured to store second image data based on the first image data, in the second storage; a third controller configured to store third image data based on the second image data, in the first storage; a fourth controller configured to output output image data based on the third image data; and an image former configured to perform image formation based on the output image data.

Image forming apparatus including a first storage, a second storage, and a bus and image forming method using the same

An image processing apparatus includes a determining unit that determines whether image data includes multi-valued drawing information for drawing a multi-valued image; a multi-valued drawing unit that draws the multi-valued image of the image data when the multi-valued drawing information is determined to be included in the image data; a less-than-multi-valued drawing unit that draws a less-than-multi-valued image of the image data when the multi-valued drawing information is not determined to be included in the image data; a value-count reducing image processing unit that reduces number of values of a drawing result of the multi-valued image to generate an image with a fewer number of values; and a less-than-multi-valued encoding processing unit that encodes a drawing result obtained by drawing the less-than-multi-valued image and encodes the generated image with the fewer number of values.

Image processing apparatus and method encoding multi-valued image generated with fewer values

A data processing device includes: a data reading unit that reads a predetermined amount of data; a data-period selection unit that selects a data period in units of the predetermined amount of data; a data clipping unit that clips data from the read data with the data period; an intermediate-data conversion unit that converts the clipped data into intermediate data; and a coding processing unit that codes the intermediate data. The data-period selection unit has a match count unit that obtains count values of matches in data between pieces of divided data that are obtained by dividing the read data in units of respective predetermined periods, and selects one of the periods of divided data that provides largest one of the count values of matches or selects, when some of the count values are the same, largest one of the periods that provide the same count value.

Data processing device and data processing method

An image processing device includes: a drawing command transfer unit that transfers a drawing command for generating image data in a third region of a second storage unit to a first region of a first storage unit; a drawing unit that generates band image data in units of a band having a lower height compared with one page and a predetermined width, in accordance with the drawing command in the first region; a band image data transfer unit that transfers the band image data to a second region of the first storage; and an image transfer unit that transfers the band image data in the second region to a fourth region of the second storage unit. The drawing unit determines the first region according to a size of the drawing command, and determines the second region by subtracting the first region from a region of the first storage unit.

Image processing device, image processing method, and image forming apparatus for processing image data having a larger size

An image processing apparatus includes a detecting unit configured to detect different predetermined periods in parallel in image data line by line; a selecting unit configured to select a longest period in the periods that are acquired by the detecting unit through detection of the periods with respect to a piece of image data corresponding to one line; a dividing unit configured to divide the piece of image data corresponding to the one line into pieces of division data in accordance with the period selected by the selecting unit; a converting unit configured to convert each of the pieces of division data into a piece of intermediate data, the division data being obtained by dividing the piece of image data corresponding to the one line by the dividing unit; and an encoding unit configured to perform compression coding on the piece of intermediate data converted by the converting unit.

Image processing apparatus, image processing method, and image forming apparatus

An image processing device includes a storage unit capable of storing various kinds of images, a first drawing unit to write a source image after subjected to an image processing in the storage unit, a second drawing unit to generate an image and write the generated image in the storage unit, and an analyzing unit to analyze a page drawing command, so that the analyzing unit controls the first drawing unit in accordance with a first drawing command, if the analyzed command is the first drawing command to instruct the first drawing unit to write the image, and the analyzing unit controls the second drawing unit in accordance with a second drawing command, if the analyzed command is the second drawing command to instruct the second drawing unit to write the image.

Image processing device

First storage stores code data each of which is formed by arranging identification at head of line code data obtained by coding image in a line unit, from first to last line of the image. Second storage recognizes the identification from the code data read by First reader to store the code data in a line unit. Third storage stores decoded image obtained by decoding the code data read from the second storage by Second reader in a line unit. When the image is rotated 180 degrees, First reader reads the code data from First storage from the last to the first line and reads each line from an end to a head of the line, Second reader reads the code data from Second storage from the identification to the end of the line, and Third reader reads the decoded image from the end to the head of the line.

Image processing apparatus, image processing method, and image forming apparatus for reading code data rotated at 180 degrees

An image processing apparatus draws an image in units of band. The image processing apparatus includes: a first storage unit that stores therein a halftone pattern; an analyzer that analyzes drawing commands, the drawing commands including a first command specifying a drawing band that is the band on which drawing is performed, a second command giving an instruction to read the halftone pattern, and a third command giving an instruction to execute drawing; and a drawing processor that, only when an image, drawing of which is instructed by the second command, is determined as belonging to the drawing band, reads the halftone pattern specified by the first command from the first storage unit to draw that image using the halftone pattern read.

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Kanagawa, Japan

Naoto Shiraishi