VLSI Implementation Of JPEG2000 Image Encoder

JPEG2000 standard offers a lot of advantages, such as low bit rates compression, progressive transmission, random access of code stream, region-of-interest coding, etc, so it may become the mainstream of static image compression standard, replacing JPEG, and will be widely used in the internet, mobile and portable devices, printing, scanning, remote sensing, medical application, HDTV, and so on. The hardware implementation of JPEG2000 image encoder is researched, including 9/7 Discrete Wavelet Transform (DWT), Quantization, Embedded Block Coding with Optimized Truncation (EBCOT) tier1, which is based on Jasper, the software implementation of JPEG2000 standard. The architecture is designed to improve the coding speed and decrease the area. The DWT is implemented with parallel scan of row and column, and reuse of the memory is taken into account; bit plane coding (BPC), belong to EBCOT, is implemented with state generation and parallel scan of three passes, saving the state memory and reaching the throughput of four bits a period; MQ encoder is implemented with four stage pipeline, which increases the clock frequency and reaches the throughput of one group of (CX, D). All the optimization improves the overall performance.The function of the design is verified through RTL simulation, which is the same with the result of Jasper. The implementation is also tested on FPGA platform. On the FGPA platform, the encoder designed is in charge of compressing the initial image data, generating the compression stream; EBCOT tier2 is implemented with C code, which is responsible for organizing the code stream. The PSNR of the rebuilt image and the initial image is the same with the result of Jasper. The results of simulation and FPGA test show that the design implements the compression function, conforming to JPEG2000 standard.