Field programmable gate array (FPGA)-based joint photographic experts group (JPEG) 2000 image decoding device and method

Abstract

The embodiment of the invention discloses a field programmable gate array (FPGA)-based joint photographic experts group (JPEG) 2000 image decoding device, which comprises a decoding controller, a code stream input cache, a code stream resolver, an embedded block coding with optimized truncation (EBCOT) decoder, an inverse quantizer, an external memory controller, an inverse wavelet transform arithmetic unit, a multi-component converter and a pixel output cache. The invention also discloses an FPGA-based JPEG2000 image decoding method. By the device and the method, high-bit rate and high-frame rate real-time decoding output of the JPEG2000 image can be realized, and the device and the method are highly flexible.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an FPGA-based JPEG2000 image decoding device and method. Background technique [0002] The JPEG2000 standard is a high-quality still image coding standard, which can provide image coding and decoding algorithms of different compression quality levels from lossless compression to lossy compression. With the rapid development of digital technology, the digitization process of movies is advancing rapidly all over the world. The American Digital Cinema Initiative (DCI) released the DCIv1.0 specification in 2005, according to which, digital cinema adopts the first part of the JPEG2000 standard (ISO / IEC15444-1) as an image compression standard. [0003] Because the JPEG2000 encoding standard has the characteristics of high compressed image quality and high algorithm complexity, the decoding part of the playback system introduced by digital film equipment manufacturers is impl...

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Problems solved by technology

With the development of digital movies from 2K resolution to 4K or even higher 8K resolution, the defects of complex system design, high power consumption and obvious poor flexibility of fixed circuit design brought about by the use of multiple ASICs directly hinder the development of this solution. Subsequent development

[0005] Although the solution based on high-performance DSP has the unique high flexibility of software implementation, for high-resolution digital movies, because the internal hardware unit of DSP is not designed for EBCOT compression / decompression and forward / inverse DWT transformation of JPEG2000, it is difficult to It is suitable for real-time applications of movie playback with high bit rate and high data rate, so it is mainly used in non-real-time applications such as medical treatment

[0006] Therefore, under the background of the development of digital movies to higher resolution and higher frame rate, the existing traditional JPEG2000 decoding chip can no longer meet the requirements of higher bit rate processing capability, higher frame rate output capability, flexibility and real-time performance. Require

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