Low-area and low-power video compressor for endoscopic capsules

The paper presents a hardware implementation of a low-power and low-area video compressor for capsule endoscopy application. The architecture uses a direct mapping to compute the two-dimensional Discrete Cosine Transform which eliminates the need of transpose operation and results in reduced area and low processing time. Instead of using the conventional binary finite precision approach, an error-free algebraic integer encoding has been used that guarantees lossless computation. The corresponding quantization table that complies with the JPEG standard has also been developed. The processor costs only 3466 cells, runs at a maximum frequency of 151 MHz, and consumes 10.30 mW of power. The test results of several endoscopic images show that higher compression ratio (over 90%) can be achieved with high quality image reconstruction.