Patent ID: 7864859

Claim:
An image compression method adapted to determining a block mode for an input image, comprising: (a) determining an intra mode or an inter mode by; obtaining a motion vector of a current image frame's pixel data and a previous image frame's pixel data, in relation to the motion vector, calculating a first sum by adding differences between the current image frame's block pixel data and the previous image frame's block pixel data, calculating a first variation for a current block, and comparing a difference between the first sum and the first variation with a first threshold value; and, b) upon determining an intra mode in (a), determining whether or not the input image is an auto-exposure controlled image; calculating a second sum by adding differences between the previous image frame's block pixel data and the current image frame's block pixel data, calculating a second variation for a current block by eliminating an offset value generated by an auto exposure control from the current image frame's pixel data, and comparing a difference between the second sum and the second variation with a second threshold value.