Image compositing apparatus, image compositing method, image compositing program, and recording medium

An image compositing method for generating a composite image by using a first image and a second image having different exposure conditions, the image compositing method comprising:

• inputting the first image and the second image;
• calculating a subject motion likelihood at each pixel based on a difference between the first image and the second image;
• estimating an exposure transform function for conforming the exposure conditions of the first image and the second image to each other based on the subject motion likelihood;
• and
• compositing the first image and the second image by using the exposure transform function.

A recording medium on which is recorded an image compositing program that causes a computer to operate so as to generate a composite image by using a first image and a second image having different exposure conditions, wherein the image compositing program recorded on the recording medium causes the computer to operate as:

• an input unit that inputs the first image and the second image;
• a likelihood calculating unit that calculates a subject motion likelihood at each pixel based on a difference between the first image and the second image;
• an exposure estimating unit that estimates an exposure transform function for conforming the exposure conditions of the first image and the second image to each other based on the subject motion likelihood;
• and
• a compositing unit that composites the first image and the second image by using the exposure transform function.