| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system and method for image compression which makes hardware implementation more efficient utilizing adaptive sized blocks and sub-blocks of discrete cosine transform coefficient data. <P>SOLUTION: A block size assignment element in an encoder selects the block or sub-block of an input block of pixels to be processed. The selection is based on the variance of pixel values. Blocks with variances larger than a threshold are subdivided, while blocks with variances smaller than a threshold are not subdivided. A transform element transforms the pixel values of the selected blocks into the frequency domain. The frequency domain values are quantized, serialized, and variable length coded for transmission. <P>COPYRIGHT: (C)2013,JPO&INPIT |
