RGB and HSI color space conversion method and circuit based on FPGA

Abstract

The invention discloses an FPGA-based RGB and HSI color space conversion method and circuit. The circuit comprises a logic circuit for converting an RGB color space into an HSI color space and a logic circuit for converting the HSI color space into the RGB color space. The method comprises the following steps: extracting R, G and B of an input image, normalizing the R, G and B to [0, 1], and calculating brightness I, chromaticity H and saturation S to obtain an HSI color image; by extracting a brightness value I, a saturation value S and a chromatic value H of an input image, intermediate variables M, N and O are calculated, and values of corresponding R, G and B are determined according to the range of the chromatic value H to obtain an RGB color image. According to the method, a traditional calculation formula for converting the RGB into the HSI is optimized, two times of addition, two times of multiplication and one time of square root operation are reduced for each pixel, the operation amount of the reserved division operation is smaller than that of the division operation before improvement, the operation amount can be effectively reduced, the precision of a calculation result is improved, and the 4KP60 system operation requirement is met.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, and in particular relates to an FPGA-based RGB and HSI color space conversion method and a circuit thereof. Background technique [0002] With the increase of video resolution and frame rate, some commonly used image preprocessing algorithms consume more time and resources of the processor in the image preprocessing stage due to the exponential increase in the amount of data calculations, resulting in the entire system unable to meet the subsequent real-time image processing requirements. [0003] In the image preprocessing algorithm, color space conversion is a commonly used algorithm. Converting color images from RGB color space to HSI color space can effectively reduce color cast and false color in the process of image processing in RGB color space. problem, so color space conversion occupies an important position in the entire image processing process. In the process of con...

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, provide a FPGA-based RGB and HSI color space conversion method and its circuit, solve the traditional RGB color space conversion HSI color space time and resource consumption problems, and at the same time Improve the accuracy of calculation results and the overall system processing capacity

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