Implementation of a recursive real time edge detector using retiming techniques

We present the design of a real time image processing circuit based on an optimized Canny Deriche filter for ramp edge detection. This filter is implemented in a recursive form. A retiming method is used to achieve very high speed filtering. The edge calculation function has been implemented using a CMOS 1 /spl mu/m process (area 29 mm/sup 2/). This ASIC is able to process a pixel in less than 30 ns and image sizes from 64/spl times/64 to 1024/spl times/1024 pixels.