Abstract: An image signal processor detects deficient pixels, such as pixels having a white deficiency or a black deficiency, and corrects the image signal so that the pixel deficiency is not reproduced. A memory circuit holds a target pixel signal and peripheral signals, which correspond to the pixels adjacent to the target pixel. A deficiency detection circuit compares the level of the target pixel signal with the levels of the peripheral pixel signals to detect whether the target pixel is deficient. A deficiency correction circuit corrects the signal of a detected deficient pixel using information from nearby pixels.

Abstract: A dynamic range expanding apparatus in an image processing system, capable of more stably expanding dynamic visual range by removing motion blurring caused when images each having different exposure levels are combined, and a dynamic range expanding method, are provided. In this apparatus, a video multiplexing unit divides a digital video signal, which is converted from an analog video signal output by a charged coupled device, into an over-exposed video signal and an under-exposed video signal having different exposure levels. A motion correction unit corrects the moving part of an excessively-exposed video according to the amount of movement of an image acquired by the charged coupled device, using the output of the video multiplexing unit.