| 摘要 |
PCT No. PCT/JP85/00671 Sec. 371 Date Aug. 5, 1986 Sec. 102(e) Date Aug. 5, 1986 PCT Filed Dec. 6, 1985 PCT Pub. No. WO86/03610 PCT Pub. Date Jun. 19, 1986.The present invention relates to image data compression utilized either when an original image is displayed on a monitor or when an original is reproduced with a desired reduction ratio. Pixel data of an original image are sequentially inputted synchronously with a clock signal (CY), and an average value of pixel data inputted theretofore is renewed in an averaging circuit (40) each time pixel data are inputted. The renewal of the average value is repeated until an assignment signal (CX) is outputted from a DDA circuit (30). The assignment signal assigns pixels of the original image to the same number of blocks as the number of pixels of a desired compressed image, which is adapted for a desired image compression. An output obtained from the averaging circuit (40) represents an average value of pixel data with respect to each block aligned in the vertical direction of the original image. In a DDA circuit (50) an assignment for blocks in the horizontal direction of the original is carried out. Average values of pixel data with respect to each block adaptable for the desired image compression are obtained by an averaging circuit ( 60), which average values are used as pixel data of each pixel of the compression image.
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