Title :
An efficient algorithm for optimizing DCT quantization
Author :
Ratnakar, Viresh ; Livny, Miron
Author_Institution :
Epson Res. & Dev., Palo Alto, CA, USA
fDate :
2/1/2000 12:00:00 AM
Abstract :
We describe the RD-OPT algorithm for DCT quantization optimization, which can be used as an efficient tool for near-optimal rate control in DCT-based compression techniques, such as JPEG and MPEG. RD-OPT measures DCT coefficient statistics for the given image data to construct rate/distortion-specific quantization tables with nearly optimal tradeoffs
Keywords :
data compression; discrete cosine transforms; image coding; optimisation; quantisation (signal); rate distortion theory; statistical analysis; transform coding; DCT coefficient statistics; DCT quantization optimization; DCT-based compression techniques; JPEG; MPEG; RD-OPT algorithm; efficient algorithm; image data; near-optimal rate control; optimal tradeoffs; rate/distortion-specific quantization tables; Discrete cosine transforms; Discrete transforms; Image coding; Lagrangian functions; Laplace equations; PSNR; Quantization; Rate distortion theory; Rate-distortion; Transform coding;
Journal_Title :
Image Processing, IEEE Transactions on
