Patent ID: 6516096
Filing Date: 2003-02-04
Classification: H04N

Abstract:
An image encoding apparatus comprising:image input means for inputting an image; frequency transforming means for determining frequency components of the image inputted by said image input means; threshold processing means for effecting threshold processing of the frequency components determined by said frequency transforming means; low-frequency image output means for outputting an image of low-frequency components of the image inputted by said image input means, in correspondence with a result of threshold processing by said threshold processing means; pixel subsampling means for subsampling the image output by said low frequency image output means, in correspondence with the result of threshold processing by said threshold processing means; coefficient-information output means for outputting the result of threshold processing by said threshold processing means; and subsampled-image output means for outputting the subsampled image from said pixel subsampling means, wherein the subsampling processing by said pixel subsampling means is effected in proportion to a ratio which is derived from a distribution of maximum frequencies within a block or frequency components which are not 0s.