Next: Resistive Grids Up: Improved Resistive Fuse Grids Previous: Extreme Pixels Contents
As a result of the considerations of noise in the previous chapter, it is clear that one of the most effective methods of removing noise is image smoothing. In a digital computer, smoothing is generally performed by convolving the image with a small filter, usually a square with between 3 and 32 pixels on a side. The filter usually has a gaussian shaped impulse response [13]. This convolution is a very computationally intense operation, involving a multiplication for every pixel within the filter window, for every pixel in the image. However, an elegant electronic version exists based on resistive grids.