Title :
Deadzone Based Rate Allocation for JPEG XR
Author_Institution :
Univ. of Stuttgart, Stuttgart, Germany
Abstract :
The JPEG XR image compression solely controls the image quality loss and hence the output rate by means of the quantizer bucket sizes; a precise rate control mechanism like the EBCOT rate allocation algorithm in JPEG 2000 is not specified, and hence rate-distortion optimality of the quantizer is, in general, not given. A simple rate-control mechanism for JPEG XR is introduced that allows an efficient control of the quantizer towards rate-distortion optimality. It was seen in an earlier work that the additional side information required for the spatial varying quantization mechanism of the standard almost compensates the PSNR gain and complicates the rate allocation process by requiring an additional quantizer allocation step.
Keywords :
image coding; quantisation (signal); rate distortion theory; EBCOT rate allocation; JPEG 2000; JPEG XR image compression; deadzone based rate allocation; image quality loss; quantizer allocation step; quantizer bucket sizes; rate control; rate-distortion optimality; Image coding; PSNR; Quantization; Rate-distortion; Resource management; Transform coding; JPEG XR!!; Quantization; Rate-Distortion Optimal Quantization;
Conference_Titel :
Data Compression Conference (DCC), 2011
Conference_Location :
Snowbird, UT
Print_ISBN :
978-1-61284-279-0
DOI :
10.1109/DCC.2011.78
