Circuit for reading image compression data and anti-distortion circuit comprising same

Abstract

The present invention relates to a circuit for reading image compression data. The circuit for reading image compression data comprises a coefficient obtaining unit, a coordinate calculation unit, a compression block header information obtaining unit and a compression data obtaining unit; the coefficient obtaining unit reads mapping coefficients of an output image block and an original image block; the coordinate calculation unit divides the original image into unit blocks with M*N pixels, M and N are positive integer being larger than 1, and the mapping relations are employed to calculate coordinates of the unit blocks of the original image corresponding to an image line; the compression block header information obtaining unit generates header information addresses of compression blocks of the unit blocks according to the coordinates of the unit blocks of the original image corresponding to the image line, and reads the header information of the compression blocks according to the header information addresses; and the compression data obtaining unit reads the compression block data according to the header information of the compression blocks. The circuit for reading image compression data and the anti-distortion circuit comprising the same achieve real-time reading of image compression data, reduce the bandwidth and reduce display delay.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a circuit for reading compressed image data and an anti-distortion circuit including the circuit. Background technique [0002] In a VR system, the lens is generally used to project the image on the display screen into the user's eyes. Due to the physical characteristics of the lens itself, the image projected to the user's eyes will produce distortion and dispersion, which will affect the user experience. In order to avoid affecting the user experience, anti-distortion processing may be performed on the image transmitted to the display screen, that is, distortion processing may be performed in advance. The image sent to the display needs to be decoded from the normal shape ( figure 1 shown on the left) is distorted into a distorted shape ( figure 1 shown on the right), while when the distorted shape ( figure 2 (shown on the left) when displayed through the lens, due to the op...

AI Technical Summary

Problems solved by technology

The process of anti-distortion transformation of each frame image is: read an original image from the dynamic random access memory (DRAM), process the original image according to the mapping relationship of the distortion transformation, and write it back to the dynamic random access memory after processing. In the memory (DRAM), the display module reads the distorted image from the dynamic random access memory (DRAM), so that the operation of one frame of image will go through reading one frame > writing back one frame > the display module reads one more Three-step frame, repeated reading and writing of dynamic random access memory (DRAM) will lead to waste of bandwidth and heavy GPU load

The existing technology usually reads the compressed data of a frame of original image and then performs decompression calculation and subsequent image processing, which will cause the problem of image display delay

At the same time, the image data after decompression and image processing needs to be saved to the memory, and then read and sent to the display by the display device, which increases the display delay and bandwidth consumption.

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