Imaging apparatus and pixel defect compensation method implemented therein

摘要

Pixel signals output from an imaging device having pixels arranged in horizontal and vertical directions are compensated if there are pixel defects. Extracted from the pixel signals are: a first signal from a target pixel; second signals from second pixels having the same color as the target pixel; and third signals from third pixels having a different color from the target pixel, the second and third pixels being located as close to the target pixel on both sides thereof in each direction. Extracted from the second signals are a highest-level signal having the highest luminance level and a second-level signal having the second luminance level. An average luminance level of the second signals is calculated. It is determined whether a particular pixel among the second pixels and causing generation of the highest-level signal is defective by using the highest and average levels. The highest-level signal is selected when the particular pixel is not defective, otherwise, the second-level signal. It is determined whether the target pixel is defective by using the levels of the first and selected signals. The first signal is output when the target pixel is not defective, otherwise, the selected signal.