| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To further improve encoding efficiency, by determining the threshold as to whether a palletization is conducted, according to block sizes of encoding units. <P>SOLUTION: A blocking section 200 inputs an image data while using the set block size as a unit and stores the image data in a buffer memory 201. A histogram preparation section 202 prepares a histogram for the colors of the image data in one block section. A decision section 203 determines the threshold from the set block size, compares a color number appearing in the prepared histogram and the threshold and outputs the result of the comparison to a displacement section 204. The decision section 203 prepares a conversion table that allocates pallet numbers, regarding each color appearing in the block, when the a color number is lower than the threshold, and sets it to the displacement section 204. The displacement section 204 reads the image data corresponding to a single block section from the buffer memory and outputs the image data to an encoding section 205. However, when the conversion table is set from the decision section 203, a pallet conversion is conducted, and the result is output to an encoding section 205 as a pixel data. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
