Patent ID: 8922680
Filing Date: 2014-12-30
Classification: H04N

Abstract:
1. An image processing apparatus for detecting, from image data generated by an image sensor constituted by a plurality of pixels, a signal from a defective pixel of the image sensor, comprising: a first determination unit configured to obtain a first determination value indicating a magnitude of a difference in signal level between a pixel of interest and a plurality of pixels located in the neighborhood of the pixel of interest; a second determination unit configured to obtain a second determination value indicating a width of distribution of the difference in signal level between the pixel of interest and the plurality of pixels located in the neighborhood of the pixel of interest; and a detection unit configured to detect whether or not the signal from the pixel of interest is a defective pixel signal, using the first determination value and the second determination value, wherein the first determination unit obtains the first determination value by obtaining differences in signal level between the pixel of interest and each of the plurality of pixels located in the neighborhood of the pixel of interest, obtaining, from each of the differences, a value indicating a possibility that the signal from the pixel of interest is a defective pixel signal, and multiplying the obtained values, the first determination value is a value that increases as the magnitude of the difference increases, and the second determination value is a value that increases as the width of distribution of the magnitude of the difference decreases, and the detection unit detects the signal from the pixel of interest as a defective pixel signal when both the first determination value and the second determination value are greater than or equal to respective predetermined thresholds.