Patent ID: 7881545
Filing Date: 2011-02-01
Classification: H04N

Abstract:
1. An image data compression method for generating compressed data of image data, comprising the steps of: dividing the image data into predetermined regions; generating modeled data by extracting a feature of the image data for each of the regions, the modeled data being data whose image reproducibility varies when a part of the modeled data is thinned out step by step; determining a thinning-out threshold value, the thinning-out threshold value being used when the compressed data is generated by thinning out data from the modeled data, and the thinning-out threshold value having a value such that data quantity of the compressed data becomes equal to or less than predetermined target data quantity; and generating the compressed data by thinning out data from the modeled data based on the determined thinning-out threshold value, wherein the image data is pseudo gradation image data that is obtained by a pseudo gradation process performed on multi gradation image data with a dither pattern, and wherein the step of generating the modeled data includes the following steps: