| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance an encoding efficiency of an entire image including a background image and improving a transmission efficiency of the background image. <P>SOLUTION: A difference image generator 202 takes a difference of respective blocks of the background image and a picked-up image, a difference image integrator 203 accumulates accumulation of each element) the difference blocks to a storage block Int, and a DCT unit 204 applies DCT to the Int. Then a DCT coefficient comparator 205 compares a difference absolute sum between the coefficient block (Int coefficient block) from the DCT unit 204 and a comparison coefficient block with a value of a threshold block. In the case that the number of blocks satisfying a relation of the difference absolute sum greater than the threshold block is a half or over of the number of total blocks, a new background image output unit 206 outputs the picked-up image as a new background image to a background image memory 100. When the relation indicates negation, the new background image output unit 206 outputs NULL indicative of not outputting the background image. <P>COPYRIGHT: (C)2003,JPO</p> |
