SONY-RGBW array color reconstruction method based on residual errors and high-frequency replacement

Abstract

The invention discloses an SONYRGBW array color reconstruction method based on residual errors and high-frequency replacement, and belongs to the technical field of photoelectric detector pixel reconstruction and color imaging. Aiming at the characteristic of spatial discrete arrangement of each channel of an SONY-RGBW filter array, a brightness W image is reconstructed by utilizing the advantagesof strong detail retention capability and high signal-to-noise ratio of brightness W channel information, the brightness W image is used as a guide image to reconstruct an RGB color image, and through guide filtering, color reconstruction results based on iterative residual interpolation in two orthogonal directions are combined, so the sampling rate of each channel pixel is gradually improved, the RGB color image is enhanced through high-frequency replacement, and color correction is performed by using a color card in a scene and a nonlinear regression model of a color correction matrix. According to the invention, the reconstruction precision and the edge detail retention capability of the solid detector can be improved, the common color aliasing and sawtooth effects in color imaging are reduced, the color accuracy of the reconstruction result of the detector is improved, and the detection performance of a photoelectric imaging system in the daytime and in a low-illumination environment is enhanced.

Description

technical field [0001] The invention relates to a SONY-RGBW array color reconstruction method, in particular to a SONY-RGBW array color reconstruction method based on residual error and high-frequency replacement, and belongs to the technical field of photodetector pixel reconstruction and color imaging. Background technique [0002] With the improvement of the sensitivity of silicon-based detectors, although CCD / CMOS color imaging based on traditional Bayer filter arrays has been extended to low-light applications, the color reproduction and signal-to-noise ratio in scenes below 1lx are still difficult to meet. application requirements. For this reason, people have researched and proposed a variety of detection and imaging technologies and color reconstruction methods based on new RGBW color filter arrays. Successful applications in products with color imaging properties. [0003] In the spectral response of a typical RGBW filter array + detector, the pixel corresponding ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by a SONY-RGBW array color reconstruction method based on residual and high-frequency replacement disclosed by the present invention is: according to the characteristics of the discrete arrangement of each channel space of the SONY-RGBW filter array, through guided filtering and high-frequency Replace the correlation between mining brightness information and color information, realize color reconstruction based on iterative residual interpolation, combine the color reconstruction results in two orthogonal directions, gradually increase the pixel sampling rate of each channel, and solve the problem by color correction In actual imaging, near-infrared radiation causes the color saturation of each channel to decrease, improve the reconstruction accuracy of solid-state detectors and the ability to maintain edge details, reduce common color aliasing and aliasing effects in color imaging, and improve detector reconstruction results Excellent color accuracy, enhancing the detection performance of photoelectric imaging systems in daytime and low-light environments

Images