Image processing apparatus

An image processing apparatus, comprising:

• a γ property storing section that stores a γ property of image pickup device;
• a shading data storing section that stores a shading pattern acquired by the image pickup device, and a first exposure time at a time of acquiring the shading pattern;
• an image information storing section that stores image data acquired by the image pickup device, and a second exposure time at a time of acquiring the image data;
• a pre-correction pattern calculating section that calculates a pre-correction pattern which is a shading pattern before γ correction, based on the shading pattern stored in the shading data storing section and the γ property stored in the γ property storing section;
• a revised pattern calculating section that calculates a revised pattern by performing γ correction for the pre-correction pattern calculated by the pre-correction pattern calculating section after multiplying the pre-correction pattern calculated by the pre-correction pattern calculating section by a ratio of the second exposure time to the first exposure time;
• and
• a shading correcting section that performs shading correction for the image data stored in the image information storing section by using the revised pattern calculated by the revised pattern calculating section.