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A pre-distortion method and device based on output image pixel position index

An image pixel and pre-distortion technology, applied in the field of video processing, can solve the problems of high hardware resource consumption, achieve low latency, eliminate edge aliasing of pre-distorted images, and simplify complexity

Active Publication Date: 2018-05-08
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

[0005] The purpose of the present invention is to provide a pre-distortion method and device based on the pixel position index of the output image to solve the problem in the prior art that the index coordinates of the distortion lookup table are based on the input image, resulting in a large consumption of hardware resources

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  • A pre-distortion method and device based on output image pixel position index

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] The distortion lookup table is sometimes simply referred to as a lookup table below.

[0027] The pre-distortion correction system disclosed by the present invention is composed of 5 parts: FPGA containing memory resources, high-speed access memory chip, non-volatile memory chip, video input circuit, video output circuit, see figure 1 .

[0028] The non-volatile memory chip in this method: mainly refers to a non-volatile memory for storing the distortion parameter lookup table and corresponding parameters, such as NOR FLASH. The distortion parameter lookup table includes two parts: outputting position information of pre-distorted image pixels, and outputting distortion parameter information of pre-distorted image pixels.

[0029] Memory chips that can be accessed at high speed in this method: mainly refer to memory that can provide distortion lookup ...

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Abstract

The present invention relates to a predistortion method based on a pixel position index of an output image and a predistortion device based on the pixel position index of the output image. A distortion look-up table established according to the method has the beneficial effects that the complexity of the hardware design is greatly simplified, the hardware resources are saved, the implementation cost is lowered, moreover, the the support for a high-order interpolation algorithm is achieved, and the phenomenon of sawteeth at the edge of a predistortion image is alleviated. The predistortion device proposed by the present invention can complete predistortion correction of an high-resolution dynamic image in real time, the delayed time is minimum, and peripheral chips are relatively the least in number.

Description

technical field [0001] The invention relates to the field of video processing, in particular to image pre-distortion correction of a digital image projection display system, in particular to FPGA-based real-time pre-distortion correction of large-resolution images. Background technique [0002] In some complex optical projection systems with large field of view and wide angle, there are various degrees of distortion widely. In many applications, these distortions affect people's perception or judgment of image content. Therefore, it is necessary to carry out proper electrical correction for the distortion of the optical system. [0003] In the pre-distortion correction scheme for real-time dynamic images, FPGA is generally used to read pixels and image interpolation according to the position coordinates of the input image in the lookup table, and output the pre-distorted image according to the scanning method of the output image. Such as Chinese patent 2698267Y and Chinese...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/006
Inventor 郑永瑞张涛
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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