Patent
Method and device for compressing picture signal, method and device for restoring picture signal, method and device for compressing and restoring picture signal and printer
TLDR
In this article, the problem of improving compressibility and reducing the time of a restoration processing in the compression technique of picture signals using run length encoding is addressed by using a run length calculation.Abstract:
PROBLEM TO BE SOLVED: To improve a compressibility and to shorten the time of a restoration processing in the compression technique of picture signals using run length encoding. SOLUTION: At the time of one-dimensionally encoding and compressing the picture signals, a white (or black) run length at present calculated in a run length calculation part 1 is compared with the white (or black) run length stored one cycle earlier in a previous data storage part 2 in a comparison part 3. When they do not match, a code chart 6 prepared beforehand is referred to and conversion to codes is performed in a code conversion part 4. When they match, the conversion to prescribed repetitive codes is performed in a repetitive code conversion part 5 without referring to the code chart 6.read more
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Patent
Image data compression apparatus for compressing both binary image data and multiple value image data
TL;DR: An image data compression apparatus which compresses code data obtained by compressing image data by a fixed length encoding method so as to reduce a scale of hardware and reduce a development cost of software for an image data compressing apparatus.
Patent
Image compression apparatus, image expansion apparatus, image forming apparatus, image compression method, image expansion method and storage medium
TL;DR: In this article, an image compression apparatus compresses image data by carrying out a parallel processing for every image pattern made up of a plurality of bits, including a first unit for obtaining a run length of the image data, a second unit for coding the run length and the repetition number obtained by the first unit, and a third unit for predicting whether or not a code length of a code generated by a word which is to be coded by the second unit exceeds a predetermined threshold value.
Patent
Method of and apparatus for encoding, method of and apparatus for decoding, and image forming apparatus
TL;DR: In this article, an encoding section 301 in an encoding apparatus sequentially inputs binary signals by a predetermined bit length, and an adder in the run length processing section 320 adds the indeterminate run length to the first run length of a binary signal of the specified bit length to be subsequently input by the image reading section 310.