1. An image processing device, comprising: a control unit configured to control an exposure time of pixel regions by setting exposure start times for the pixel regions in accordance with different exposure times of the pixel regions; a pixel portion configured to output pixel information including high sensitivity pixel information from pixel regions of long exposure times and low sensitivity pixel information from pixel regions of short exposure times; and a pixel information combining unit configured to set weighting coefficients for the high sensitivity pixel information from the pixel regions of long exposure times and for the low sensitivity pixel information from the pixel regions of short exposure times based on a brightness of a photographic subject, and to calculate a pixel value for one or more pixels of an output image based on the weighting coefficients, the high sensitivity pixel information from the pixel regions of long exposure times, and the low sensitivity pixel information from the pixel regions of short exposure times.