In this paper, a thorough review is presented of noise reduction jlters for digital image sequences. Detailed descriptions of several spatiotemporal and temporal noise reduction algorithms are provided. To aid in comparing between these different algorithms, we classrfy them based on their support (i.e., 3-0 or I-D j l t e r) and whether or not motion compensation is employed. Several algorithms from each of the four categories are implemented and tested on real sequences degraded to various signal-to-noise ratios. These experimental results are discussed and analyzed to determine the overall advantages and disadvantages of the four general classijications, as well as, the individual jlters.
Xetal is a digital signal processor to be combined with a 30 frames per second VGA-format CMOS or CCD image sensor or any other source of digital video data. The processor is fully programmable and therefore able to run a variet?, of algorithms ranging from image communication to machine vision. Xetal comprises a parallel processor array and a special purpose controller to achieve high computational performances (up to 5 GOPS) with a very modest power consumption. This can go down to 30 mWatts for simple applications such as a digital camera for video cor?ferencing. The Xetal chip has been realized in a 0.18 pm CMOS process and takes up an area of 25 iriiri '.
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