Multi-thread arithmetic coding circuit and method based on standard JPEG 2000

Abstract

The invention discloses a multi-thread arithmetic coding circuit and method based on the standard JPEG 2000 and mainly aims to solve the problem of large area, low encoding efficiency and low throughput of a conventional multi-context arithmetic coder. The coding circuit is characterized in that under the premise of ensuring that the compression result is identical with that of the standard JPEG 2000, a command generating subunit, a command register and a comparator are introduced to a command generating and index forecasting unit' in the arithmetic coder, and the comparator is used for generating a 'command for controlling the thread coding mode; and simultaneously, an interval adjustment selector, a probability estimate selector and an index selector are controlled according to the command value to allocate the last coding result to the current to-be-coded thread, so that the logic complexity is reduced. Besides, according to the invention, LUTs (lookup tables) are split and expanded, wherein the primary LUT stores all possible index values, and the secondary LUT only stores probability estimate value. The simulation result shows that the invention has the characteristics of small area and high throughput and can be applied to high-performance image processing chips.

Description

technical field [0001] The invention belongs to the technical field of microelectronics and relates to chip design, in particular to an encoding method and circuit structure of an arithmetic encoder conforming to the JPEG2000 standard, which is mainly used in the field of digital image encoding chip design. Background technique [0002] JPEG2000, as a new generation static compression coding standard, has been widely used in Internet, image transmission and other fields. Compared with traditional JPEG, JPEG2000 has efficient compression effect and good anti-error ability, it supports quality scalability, resolution scalability, region of interest coding, and supports both lossless and lossy in the same frame compression. [0003] The JPEG2000 algorithm is mainly composed of discrete wavelet transform DWT, optimized truncated embedded block coding algorithm EBCOT, quantization, bit-plane coding, arithmetic coder MQ and code flow control. Among them, the wavelet transform an...

AI Technical Summary

Problems solved by technology

Although there has been some improvement in the coding efficiency and performance of the circuit, there are still two problems: first, in order to be able to handle multiple contexts CX, this technology has added a large number of multiplexers and storage units. To a certain extent, the circuit area and logic complexity are increased; secondly, in this technology, if the shift number in the normalization operation of the interval adjustment register A is not zero, the calculation of the context CX will stop, and the processing efficiency of the circuit will be affected. certain restrictions

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