A fpga-based image character overlay method

Abstract

The invention discloses an image character overlay method based on FPGA, which includes: taking the preset pixel position of the image as the starting point to sequentially traverse the starting point of a single character area; according to the preset first mapping table, judging whether the character area to which the starting point belongs To superimpose characters, obtain the character content to be superimposed in the character area according to the preset first mapping table; obtain the actual superimposed character content in the character area according to the character content attribute; search the second mapping table according to the actual superimposed character content, and obtain the superimposed character bit The memory address data of the image information; traverse and read each pixel data in the superimposed character bitmap information according to the memory address data, and traverse and write to the image pixels. The present invention can realize real-time and efficient superimposition of character information of images by only using few resources inside the FPGA, and superimposed position, superimposed content and superimposed character display can flexibly adapt to character superimposed requirements.

Description

technical field [0001] The invention relates to the technical field of FPGA video processing, in particular to an FPGA-based image character overlay method. Background technique [0002] With the wide application of video technology, video character superposition technology has also obtained unprecedented development. Video character overlay is to display character information at a specific position of the video image and provide auxiliary prompt information. [0003] The conventional method of superimposing character information is to use software, based on ARM or CPU, to cache a complete frame of image in the access memory space and then superimpose characters. It takes tens of milliseconds or even longer to process a picture, which improves the processing efficiency. Low, cannot be applied to video character superimposition at higher frame rates, and requires very large access memory space resources to cache complete images; [0004] For the improvement of conventional ...

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Problems solved by technology

[0003] The conventional method of superimposing character information is to use software, based on ARM or CPU, to cache a complete frame of image in the access memory space and then superimpose characters. It takes tens of milliseconds or even longer to process a picture, which improves the processing efficiency. Low, cannot be applied to video character superimposition at higher frame rates, and requires very large access memory space resources to cache complete images;

[0004] For the improvement of conventional overlay character method, adopt FPGA to carry out image character overlay, for example adopt the register memory of FPGA to store the superimposed character, each character allocates independent register memory, causes to take up a large amount of FPGA memory resources, and overlay position, overlay content and The superimposed character display method cannot flexibly adapt to different superimposed requirements

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