Real-time implementation of Retinex algorithm on TS201

The Retinex is an image enhancement algorithm that improves the brightness,contrast and sharpness.Many potential applications require the use of Retinex processing at video frame rates.It is difficult to achieve because the algorithm contains a large number of complex computations and data transfers.Accordingly,a fast computation algorithm executing on TS201 is proposed.The algorithm adopted series optimizations,such as SingLeton structure,paralleling of assembly instructions,loop unrolling and software pipelining.The input image is segmented in four blocks because of the limited memory of TS201.The experiment results prove that the algorithm can process a 512×256 image in 18.5 ms operating at a clock rate of 500 MHz.