CMOS implementation of an analogue median filter for image processing in real time

Abstract

Abstract. An analogue median filter, realised in a 0.35 µm CMOS technology, is presented in this paper. The key advantages of the filter are: high speed of image processing (50 frames per second), low-power operation (below 1.25 mW under 3.3 V supply) and relatively high accuracy of signal processing. The presented filter is a part of an integrated circuit for image processing (a vision chip), containing: a photo-sensor matrix, a set of analogue pre-processors, and interface circuits. The analysis of the main parameters of the considered median filter is presented. The discussion of important limitations in the operation of the filter due to the restrictions imposed by CMOS technology is also presented.

Advancements in Filter Technology: Evolution and Applications

“…Filters are also important in video processing to remove noise and unwanted frequency components from a video signal. For example, a low-pass filter can be used to remove high-frequency noise and clutter from a video signal [8], and a high-pass filter can be used to remove low-frequency noise and clutter. In addition, there are special filters, such as sharpening filters and blur filters, that can be used to enhance the clarity or blurriness of the image [9].…”