Chapter | 28 |
Digital image processing in the frequency domain
We have seen in various chapters that a digital image is a rectangular array of numbers representing the luminance and colour at discrete positions in a scene. The image can be thought of as a matrix of pixels, each pixel carrying three numerical values (i.e. one per colour channel). The pixel position identifies a spatial coordinate and each pixel value represents the intensity of the colour channel at that position. The three values of a pixel depend on the colour model employed. For example, they may represent primary colour components of red, green and blue (e.g. RGB), or they may represent luminance and ...