Patent ID: 7095451

Claim:
An image processing system comprising: an extension degree setting section which sets a degree of extension of luminance values of pixels in one frame based on the maximum and minimum luminance values of the pixels; an extension section which extends luminance values of pixels to be subjected to processing among the pixels in the frame toward one of black and white sides based on the degree of extension when the luminance values are equal to or higher than a predetermined threshold value, and extends the luminance values toward one of white and black sides based on the degree of extension when the luminance values are lower than the predetermined threshold value; and a control section which generates information of request for causing the extension degree setting section to update the degree of extension, based on the maximum and minimum luminance values of the pixels in one frame, wherein the extension degree setting section uses a new degree of extension in the case where the information of request has been received, and uses the original degree of extension in the case where the information of request has not been received.