Abstract: The object of the present invention is to provide an image encoding device and decoding device which allows the maximum compression rate to be achieved with a visually uniform level of picture quality. The present invention has a characteristic pixel extractor 0309 which encodes input images by small region unit in accordance with an irreversible compression method, decodes the encoded data which is created, and utilizes the input image and decoded image obtained after decoding to extract characteristic pixels, a characteristic distortion calculator 0311 which utilizes characteristic pixels to calculate characteristic distortion of the decoded image in relation to the input image, and an encoding parameter controller 0312 which controls parameter values determining the degree of data compression in line with the extent of characteristic distortion.

Abstract: An input image is subjected to image region determination in a unit of prescribed block. Based on a result of image region determination, two or more pieces of layer data, of which validity or invalidity at the time of reproduction of the image is defined in a unit of prescribed block are generated by using data of the input image. Then, each of the two or more pieces of layer data is subjected to coding processing under a coding condition suitable for each of the generated two or more pieces of layer data, in a unit of block suitable for each of the two or more pieces of layer data.

Abstract: An image automatic display device for reading automatic operation data as one of pieces of input data has a display image data generation device and a display image data generation operation processing unit. The display image data generation device generates image data to be displayed on a display device on the basis of image data read out from an image input device. The display image data generation operation processing unit controls the display image data generation device by using user operation input data inputted through a viewer operation input device and the automatic operation data. The automatic operation data has a plurality of sets of values of various parameters used for generating an image to be displayed. A user performs an operation through the viewer operation input device, so that a desired set to be applied for image generation is designated in the automatic operation data.

Abstract: An input image is subjected to image region determination in a unit of prescribed block. Based on a result of image region determination, two or more pieces of layer data, of which validity or invalidity at the time of reproduction of the image is defined in a unit of prescribed block are generated by using data of the input image. Then, each of the two or more pieces of layer data is subjected to coding processing under a coding condition suitable for each of the generated two or more pieces of layer data, in a unit of block suitable for each of the two or more pieces of layer data.

Abstract: An image automatic display device for reading automatic operation data as one of pieces of input data has a display image data generation device and a display image data generation operation processing unit. The display image data generation device generates image data to be displayed on a display device on the basis of image data read out from an image input device. The display image data generation operation processing unit controls the display image data generation device by using user operation input data inputted through a viewer operation input device and the automatic operation data. The automatic operation data has a plurality of sets of values of various parameters used for generating an image to be displayed. A user performs an operation through the viewer operation input device, so that a desired set to be applied for image generation is designated in the automatic operation data.

Abstract: An image compression apparatus capable of efficiently encoding an image without causing color deviation to the eye compresses luminance element image data and two types of chrominance element image data each consisting of a plurality of blocks.

Abstract: An image coding apparatus corresponding to a standard scheme of binary image compression and having the compression efficiency of a gray scale image improved includes: a bit plane generator (303) dividing unitary image data into a plurality of bit planes determined according to the number of bits forming each pixel, an image preprocessor (305) connected to the bit plane generator (303) to arrange bit data of the same position forming a plurality of bit planes in close proximity to combine into a single bit plane, and a data compressor (306) connected to the image preprocessor (305) to compress an image of the single bit plane.

Abstract: The object of the present invention is to provide an image encoding device and decoding device which allows the maximum compression rate to be achieved with a visually uniform level of picture quality. The present invention has a characteristic pixel extractor 0309 which encodes input images by small region unit in accordance with an irreversible compression method, decodes the encoded data which is created, and utilises the input image and decoded image obtained after decoding to extract characteristic pixels, a characteristic distortion calculator 0311 which utilises characteristic pixels to calculate characteristic distortion of the decoded image in relation to the input image, and an encoding parameter controller 0312 which controls parameter values determining the degree of data compression in line with the extent of characteristic distortion.

Abstract: The present invention has a characteristic pixel extractor 0309 which encodes input images by small region unit in accordance with an irreversible compression method, decodes the encoded data which is created, and utilises the input image and decoded image obtained after decoding to extract characteristic pixels, a characteristic distortion calculator 0311 which utilises characteristic pixels to calculate characteristic distortion of the decoded image in relation to the input image, and an encoding parameter controller 0312 which controls parameter values determining the degree of data compression in line with the extent of characteristic distortion. The regions of picture quality of a visually uniform level thus obtained are all compressed using an image compression method with a high compression efficiency, thus allowing the maximum compression rate to be achieved.

Abstract: An image encoding device capable of maintaining high efficiency to encode data and also reducing erroneous substitution of an input pattern through encoding, includes an input pattern extractor (305) extracting an input pattern from image data, a representative pattern extractor (311) comparing extracted input patterns for each constituent portion of the input patterns to extract a single representative pattern from similar input patterns, a representative pattern image compressor (318) compressing an image of a representative pattern, and an input pattern information compressor (317) compressing a position of a coordinate of an input pattern.