Joint photographic experts group (JPEG) image compression concurrency control method based on digital signal processor (DSP)

Abstract

The invention relates to a joint photographic experts group (JPEG) image compression concurrency control method based on a digital signal processor (DSP), which comprises the following steps: adjusting a JPEG algorithm structure, adopting a step-by-step completed strategy for image data partitioning operation, namely encoding while partitioning, and simultaneously transferring partitioned data block units into an internal memory to be processed; opening up two memory areas in the internal memory; dividing JPEG algorithm by combination with encoding structure characteristics and a hardware structure of the DSP, achieving concurrency completion in the two memory areas in the internal memory through the DSP and a peripheral device enhanced direct memory access (EDMA), and achieving concurrent execution of the JPEG algorithm on the DSP based on the concurrency completion. The JPEG image compression concurrency control method prevents a processor from reading and writing an external memory, greatly prolongs JPEG encoding time, provides conditions for JPEG real-time processing, and improves utilization rate and algorithm execution efficiency of the DSP.

Description

technical field [0001] The invention relates to an image compression technology in digital information technology, in particular to a DSP-based parallel control method for JPEG image compression. Background technique [0002] JPEG (Joint Photographic Experts Group) is a committee that formulates still image compression standards under the leadership of the International Organization for Standardization (ISO). The first set of international still image compression standards ISO 10918-1 (JPEG) was formulated by this committee. Due to the excellent quality of JPEG, the That It has achieved great success in just a few years and has been widely used in the fields of Internet and digital cameras. The JPEG format is currently the most popular image format on the Internet, and it is the format that can compress files to the smallest size. 80% of the images on the website use the JPEG compression standard. However, the JPEG compression algorithm has high complexity and slow encodin...

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Problems solved by technology

In this way, a large number of accesses to the external memory are required, and the sequential processing of data seriously affects the parallelism of program execution, and the processor and its peripherals are not effectively utilized, which affects the working efficiency of the DSP.

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