Patent ID: 7787700

Claim:
A signal processing method using a processor, comprising: generating a thinned image by thinning, in a checkerboard like manner, image data comprising a plurality of pixels that are arranged, as a square, in a row direction and in a column direction perpendicular to the row direction; generating a first square array by extracting only odd-numbered lines from lines of the thinned image in the row direction and in the column direction, and generating a second square array by extracting only even-numbered lines from the lines of the thinned image in the row direction and in the column direction; performing an image compression process, for compressing image data for the first square array to generate first compressed data, and for compressing image data for the second square array to generate second compressed data; and performing an image expansion process, for expanding the first compressed data to generate first expanded data, and for expanding the second compressed data to generate second expanded data, for rearranging, at every other pixel, the first expanded data on the odd-numbered lines, and for rearranging, at every other pixel, the second expanded data on the even-numbered lines, to form a restored image having the checkerboard like manner.