- Reduction of noise caused by absorption of x-ray photons in pixelated image sensors

摘要

A method and corresponding apparatus for reducing the noise caused by the absorption of x- ray photons in the image sensor having a plurality of pixels is provided. The method as calculating (S2) a directional gradient in a plurality of different directions in a pixel neighborhood of the hot pixels identify the pixels that are affected by the so-called hot-line absorption x- (S1) and, for each hot pixel based. The method also includes the replacement value based on neighboring pixel values ​​in the selected direction (s) selecting at least one direction of the direction with the lowest slope (S3) and, for each of the hot-pixels for each of the hot pixels It includes determining (S4). For each hot pixel value of the pixel it is replaced with the determined hot replacement value (S5). And in this way maintain the resolution (sharpness) of an image is substantially the noise generated due to the absorption of x- ray photons within the image sensor can be reduced. ;