Abstract: An image encoding apparatus includes an input unit that receives image data; a prediction unit that calculates a predicted pixel value of a pixel of interest to be processed in the image data; a prediction error calculating unit that calculates a prediction error value by using an actual pixel value and the predicted pixel value of the pixel of interest; a main encoder that encodes the prediction error value with information including a number of bits and an error value, the main encoder encoding, as the error value, only one or more most significant bits corresponding to a number of effective bits when the number of bits exceeds the number of effective bits; and an additional encoder that encodes one or more least significant bits of the prediction error value, excluding the one or more most significant bits corresponding to the number of effective bits, as an additional error value.

Abstract: An image encoding apparatus includes an input unit that receives image data; a prediction unit that calculates a predicted pixel value of a pixel of interest to be processed in the image data; a prediction error calculating unit that calculates a prediction error value by using an actual pixel value and the predicted pixel value of the pixel of interest; a main encoder that encodes the prediction error value with information including a number of bits and an error value, the main encoder encoding, as the error value, only one or more most significant bits corresponding to a number of effective bits when the number of bits exceeds the number of effective bits; and an additional encoder that encodes one or more least significant bits of the prediction error value, excluding the one or more most significant bits corresponding to the number of effective bits, as an additional error value.

Abstract: An image processing device includes a first output unit that performs predetermined image processing for image data, and outputs image data having m bits per pixel; a second output unit that performs pseudo gradation-increase processing by a dither method or a multilevel error diffusion method for the output image data, and outputs image data having n bits per pixel, where n<m; and a compression unit that compresses the output image data. When a dither matrix for the dither method or a filter for the multilevel error diffusion method used by the second output unit for the pseudo gradation-increase processing is divided into plural pixel groups each including plural adjacent pixels and when each pixel group serves as a unit, processing parameters respectively set for pixels in the same pixel group are similar as compared with processing parameters respectively set for pixels in different pixel groups.

Abstract: An image composition device includes: a determination unit that determines an overlap state between respective pixel strings on corresponding lines in plural first image data pieces, having plural continuous pixels in the same color as a pixel string, including continuous coordinates with start point coordinate information and end point coordinate information of the pixel string, using the plural first image data pieces; and a composition unit that composes plural second image data pieces based on a result of determination by the determination unit.

Abstract: Provided is an image processing apparatus including a receiving unit that receives a point sequence image, a point-plane conversion unit that performs a point-plane conversion processing for the image received by the receiving unit, plural lossy encoding units that perform a lossy encoding processing for the point-plane conversion image by using the point-plane conversion unit, and a control unit that performs control such that transmission of the image to the lossy encoding unit from the point-plane conversion unit is controlled to synchronize lossy encoding processings of the plural lossy encoding units, and each lossy encoding unit changes processing variables used in the encoding processing based on a code amount of the processing result of the lossy encoding unit.

Abstract: An image encoding apparatus includes an input unit, a prediction unit, a prediction error calculating unit, and an encoder. The input unit receives, as an input, image data. The prediction unit calculates a predicted pixel value of a pixel of interest serving as a target to be processed in the image data. The prediction error calculating unit calculates a prediction error value by using an actual pixel value and the predicted pixel value of the pixel of interest. The encoder encodes the prediction error value with information including a number of bits and an error value. The encoder encodes, as the error value, only one or more most significant bits corresponding to a number of effective bits when the number of bits exceeds the number of effective bits.

Abstract: An image coding apparatus includes: a transformation unit that transforms spatial domain image data having plural pixels, by a pixel block including plural pixels as a unit, into plural coefficient groups each including plural frequency domain coefficients; a grouping unit that classifies the plural coefficient groups into plural groups for classification of values in these coefficient groups; a quantization coefficient calculation unit that calculates a quantization coefficient used for quantizing plural coefficients included in the respective plural coefficient groups based on the number of coefficient groups classified in the plural groups and the values of the coefficient groups classified in the plural groups; a quantization unit that quantizes the respective plural coefficients included in the respective plural coefficient groups obtained by the transformation by using the calculated quantization coefficient; and a coding unit that encodes the plural coefficients included in the plural quantized coeffic

Abstract: Provided is an image processing apparatus including a receiving unit that receives a point sequence image, a point-plane conversion unit that performs a point-plane conversion processing for the image received by the receiving unit, plural lossy encoding units that perform a lossy encoding processing for the point-plane conversion image by using the point-plane conversion unit, and a control unit that performs control such that transmission of the image to the lossy encoding unit from the point-plane conversion unit is controlled to synchronize lossy encoding processings of the plural lossy encoding units, and each lossy encoding unit changes processing variables used in the encoding processing based on a code amount of the processing result of the lossy encoding unit.

Abstract: An image processing apparatus includes a partitions setting unit that sets up image partitions into which an input image is separated; a tone number setting unit that sets the number of tones for each of the image partitions set up by the partitions setting unit, based on gray levels of pixels included in each of the image partitions; and a conversion unit that converts each of the image partitions of the input image into an image partition represented with tones equal to or less than the number of tones set by the tone number setting unit.

Abstract: An image processing apparatus includes: a reference-based coding unit that encodes image information for an image partition having a predefined size by referring to image information for another image partition; an independently coding unit that encodes the image information for the image partition independently of any other image partition; and a bounds defining unit that defines bounds of reference to be made by the reference-based coding unit.

Abstract: An encoding device includes a first memory that stores image data, plural second memories that are associated with plural target pixels in the image data, each second memory storing pixel data of one or more reference pixels near the associated target pixel thereof, a controller that causes each second memory to store pixel data of the one or more reference pixels near the associated target pixel thereof specified from the image data stored in the first memory, and plural encoders that perform encoding on each of the plural target pixels by estimating pixel data of each target pixel using pixel data of the one or more reference pixels near each respective target pixel stored in the plural second memories wherein the plural target pixels have different positions in a subscanning direction such that one target pixel does not overlap with another target pixel in a main scanning direction, and the total amount of data of all of the reference pixels used by the plural encoders is equal to or less than the amount o

Abstract: An image processing apparatus includes an image receiving unit receiving an image, a conversion unit converting the received image, a separation unit separating the converted image into pixel synchronization information and pixel asynchronization information, a first encoding unit encoding the pixel synchronization information, a second encoding unit encoding the pixel asynchronization information, a first decoding unit decoding a code encoded by the first encoding unit to generate the pixel synchronization information, a second decoding unit decoding a code encoded by the second encoding unit to generate the pixel asynchronization information, a synthesis unit synthesizing the decoded pixel synchronization information with the decoded pixel asynchronization information on the basis of the pixel synchronization information, a reverse conversion unit performing a conversion process reverse to the conversion process of the conversion unit on the synthesized information, and an output unit outputting the image c

Abstract: An image processing device includes a first output unit that performs predetermined image processing for image data, and outputs image data having m bits per pixel; a second output unit that performs pseudo gradation-increase processing by a dither method or a multilevel error diffusion method for the output image data, and outputs image data having n bits per pixel, where n<m; and a compression unit that compresses the output image data. When a dither matrix for the dither method or a filter for the multilevel error diffusion method used by the second output unit for the pseudo gradation-increase processing is divided into plural pixel groups each including plural adjacent pixels and when each pixel group serves as a unit, processing parameters respectively set for pixels in the same pixel group are similar as compared with processing parameters respectively set for pixels in different pixel groups.

Abstract: An information processing apparatus includes a receiving unit, a separating unit, a first encoding unit, and a second encoding unit. The receiving unit receives information to be encoded. The separating unit separates the information received by the receiving unit into first information and second information on the basis of a predetermined condition. The first encoding unit encodes the first information using a first coding scheme. The second encoding unit encodes the second information using a second coding scheme that is different from the first coding scheme used by the first encoding unit. The first encoding unit encodes the first information using the first coding scheme that is more efficient than the second coding scheme used by the second encoding unit. The second encoding unit encodes the second information using the second coding scheme that is less efficient than the first coding scheme used by the first encoding unit.

Abstract: An image processing apparatus includes a criteria setter that sets selection criteria for selecting quantization intensities on the basis of feature indices of an inputted image; an intensity selector that selects, on the basis of the selection criteria set by the criteria setter, one of plural quantization intensities for each partial image area of the inputted image; and a quantizer that quantizes image information on each partial image area with the quantization intensity selected by the intensity selector.

Abstract: An image processing apparatus includes an image partitioning unit that partitions an image represented by input image information into image partitions, each containing plural pixels; a run coding unit that run-length encodes image partitions for which all pixels contained in any of the image partitions match with a pixel value in a predetermined position in another image partition; and an independently coding unit that encodes image partitions other than image partitions encoded by the run coding unit, so that the resulting codes are decoded independently for each image partition.

Abstract: An encoder includes a prediction unit and a code generation unit. The prediction unit predicts target data and judges whether prediction is right or wrong. When the prediction unit judges that consecutive predictions for respective target data are wrong, the code generation unit generates coded data including symbols corresponding to the respective target data for which the consecutive wrong predictions are made, using a code representing number of the consecutive predictions judged as wrong.

Abstract: An image coding apparatus includes: a transformation unit that transforms spatial domain image data having plural pixels, by a pixel block including plural pixels as a unit, into plural coefficient groups each including plural frequency domain coefficients; a grouping unit that classifies the plural coefficient groups into plural groups for classification of values in these coefficient groups; a quantization coefficient calculation unit that calculates a quantization coefficient used for quantizing plural coefficients included in the respective plural coefficient groups based on the number of coefficient groups classified in the plural groups and the values of the coefficient groups classified in the plural groups; a quantization unit that quantizes the respective plural coefficients included in the respective plural coefficient groups obtained by the transformation by using the calculated quantization coefficient; and a coding unit that encodes the plural coefficients included in the plural quantized coeffic

Abstract: An image composition device includes: a determination unit that determines an overlap state between respective pixel strings on corresponding lines in plural first image data pieces, having plural continuous pixels in the same color as a pixel string, including continuous coordinates with start point coordinate information and end point coordinate information of the pixel string, using the plural first image data pieces; and a composition unit that composes plural second image data pieces based on a result of determination by the determination unit.

Abstract: A coding apparatus includes a color space conversion unit that converts input image data into image data which is represented in another color space, a gradation changing unit that changes gradation of the input image data, based on the converted image data, and a predictive coding unit that performs predictive coding on the image data subjected to the gradation change.