Automatic exposure method and mobile terminal

Abstract

The present invention provides an automatic exposure method applied to a mobile terminal. The mobile terminal includes a color camera and a black-and-white camera. The automatic exposure method comprises the steps of obtaining the color image of the color camera and the black-and-white image of the black-and-white camera, wherein the two images are acquired synchronously; calculating the color intensity value of the color image and the black-and-white intensity value of the black-and-white image; according to the color intensity value of the color image and the black-and-white intensity value of the black-and-white image, adjusting the exposure parameters of the color camera; according to the adjusted exposure parameters of the color camera, controlling the exposure of the color camera. The present invention also provides a corresponding mobile terminal. Based on the automatic exposure method of the present invention, the exposure parameters of the color camera can be adjusted based on the combination of the color camera and the black-and-white camera, so that the exposure setting for the current scene can be configured more scientifically. The more accurate exposure is realized. Therefore, the problem in the prior art that the color camera is small in dynamic range so as to cause the overexposure / over-dark condition of the local region of a photographed image can be effectively solved.

Description

Technical field [0001] The present invention relates to the field of mobile communication, in particular to an automatic exposure method and a mobile terminal. Background technique [0002] With the popularity of smart phones, users have higher and higher requirements for the image display quality of smart phones. Exposure is a key factor in determining the final effect of photos. At present, the automatic exposure method is widely used in smart phone cameras. [0003] The automatic exposure metering method of the existing smart phone camera is set based on the image information of the color camera. Most of the metering methods such as spot metering, central weight metering, and average metering weights are set directly , Only the weight of multi-zone evaluative metering method is dynamically set based on the difference between different regions of the current frame. Regardless of the light metering method, it is based on the image information of the current color camera, and only...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an automatic exposure method and a mobile terminal to solve the problem that local areas of captured images are overexposed or too dark due to the low dynamic range of the color sensor, making it difficult to distinguish details in dark areas of the image, and unable to take pictures expected by users.

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