Awb calibration method and device, computer readable storage medium, terminal

Abstract

An AWB calibration method and device, a computer-readable storage medium, and a terminal. The AWB calibration method includes: obtaining the first white point obtained by collecting a neutral color of a device to be calibrated under a calibrated light source, and presupposing that the target device collects a neutral color under a calibrated light source. The second white point obtained by neutral color; if the first difference between the first red difference value and the second red difference value is greater than the first set threshold and / or the first blue difference value and the second blue If the second difference of the color difference value is greater than the second set threshold, then adjust the second red difference value to make the first difference smaller, and / or adjust the second blue difference value to make the The second difference value becomes smaller; using the adjusted second red difference value and / or the adjusted second blue difference value as the first target value and / or the second target value respectively, the device to be calibrated is performed calibration. The technical scheme of the invention can realize the accuracy of AWB calibration and improve the applicable scope of the AWB calibration method.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an AWB calibration method and device, a computer-readable storage medium, and a terminal. Background technique [0002] In order to eliminate the ratio R / G of the red component (Red, R) to the green component (Green, G) and the ratio R / G of the blue component (Blue, B) to the green component due to production errors between the lens modules In order to make a correct color temperature estimate, an automatic white balance (AWB) calibration method is usually introduced into the lens module production line. [0003] In the prior art, the commonly used AWB calibration method includes the following steps: 1) Under the specified calibration light source (usually select a high color temperature light source and a low color temperature light source), obtain Sampling distribution diagram about red component value and blue component value; 2) Calculate the average value o...

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Problems solved by technology

[0004] However, for equipment within a small error range, such as equipment with an error of less than 10%, a more accurate calibration can be achieved by using the AWB calibration method of the prior art; and for equipment with a larger error, such as an error greater than 15%, or even 20% If the AWB calibration method of the prior art is used for the equipment, the calibration gain may be too large or too small, so that the gap between the calibrated white point and the white point of the target device is too large, and the calibration effect is poor, causing the device to estimate the subsequent color temperature. Inaccurate, reducing image quality

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