Patent ID: 8243154

Claim:
An image processing apparatus detecting a change amount between a first image and a second image which are anteroposterior in a chronological order, the image processing apparatus comprising: a gain calculating unit performing a geometric transformation on a specific pixel group α extracted from the first image using an input position shift amount as a geometric transformation parameter, and calculating a gain value based on a luminance difference between pixels of the specific pixel group a in the first image after the geometric transformation is performed and pixels in the second image existing at an identical coordinate as the pixels of the specific pixel group α; a position shift amount calculating unit multiplying the gain value being input to the second image, extracting a specific pixel group β from the first image, and calculating a position shift amount by estimating a position change amount of the specific pixel group β between the first image and the second image to which the gain value is multiplied; and a detecting unit detecting the change amount by executing the gain calculating unit and the position shift amount calculating unit for at least one time or more using the position shift amount calculated by the position shift amount calculating unit as an input for the gain calculating unit and the gain value calculated by the gain calculating unit as an input for the position shift amount calculating unit.