Abstract: There is provided a digital image encoding device which can enhance image compression performance while maintaining an image quality. When coefficient bits are decomposed/aligned in four encoded paths for each context by a procedure called coefficient bit modeling of a JPEG 2000 encoding system, if an appearance frequency of “1” is low in subbit plane coefficients of a clean-up path of a low-order bit plane n (bit plane n is lower in order than bit plane np represented by threshold value np), coefficients of subbit planes of this clean-up path are all reset to “0.” Thus, a run length used when a symbol and a context are generated is made longer and, as a result, the amount of codes after arithmetic encoding at a subsequent stage is reduced while an image quality deterioration is suppressed.

Abstract: There is provided a digital image encoding device which can enhance image compression performance while maintaining an image quality. When coefficient bits are decomposed/aligned in four encoded paths for each context by a procedure called coefficient bit modeling of a JPEG 2000 encoding system, if an appearance frequency of “1” is low in subbit plane coefficients of a clean-up path of a low-order bit plane n (bit plane n is lower in order than bit plane np represented by threshold value np), coefficients of subbit planes of this clean-up path are all reset to “0.” Thus, a run length used when a symbol and a context are generated is made longer and, as a result, the amount of codes after arithmetic encoding at a subsequent stage is reduced while an image quality deterioration is suppressed.

Abstract: An image processing apparatus and an image processing method, and a storage media thereof which enable an image read-out by a scanner to be enlarged with arbitrary scale factor in a horizontal scanning direction and a vertical scanning direction. An analog signal which corresponds to an enlarged image obtained by changing scanning speed in a vertical scanning direction according to scale factor is inputted to an A/D converter to be converted into digital image data, before to be supplied to a line memory. The image data is read-out synchronized with a thinned-out pulse outputted from a horizontal scanning thinned-out pulse generator to be outputted synchronized with one-pixel pulse.