Method for controlling exposure time of high dynamic range image

摘要

A method for controlling an exposure duration of a high dynamic range image, including: consecutively generating a first high dynamic range image having a first exposure duration ratio and a second high dynamic range image having a second exposure duration ratio greater than the first exposure duration ratio; performing image quality evaluations on both the first high dynamic range image and the second high dynamic range image to obtain a first image quality and a second image quality, respectively; and determining whether the second image quality is better than the first image quality; if yes, generating a third high dynamic range image having a third exposure duration ratio greater than the second exposure duration ratio; if not, generating the third high dynamic range image having the first exposure duration ratio and setting the first exposure duration ration as the optimal exposure duration ratio.

主权项

1. A method for controlling exposure time of high dynamic range images, comprising steps of:
using an image sensor to respectively shoot a first long exposure time image and a first short exposure time image for being merged to generate a first high dynamic range image having a first exposure duration ratio, wherein the first exposure duration ratio is a ratio of an exposure duration of the first long exposure time image to an exposure duration of the first short exposure time image; using the image sensor to respectively shoot a second long exposure time image and a second short exposure time image for being merged to generate a second high dynamic range image having a second exposure duration ratio after shooting the first long exposure time image and the first short exposure time image, wherein the second exposure duration ratio is a ratio of an exposure duration of the second long exposure time image to an exposure duration of the second short exposure time image, wherein the second exposure duration ratio is greater than the first exposure duration ratio; performing an image quality evaluation for the first high dynamic range image to obtain a first image quality, and performing an image quality evaluation for the second high dynamic range image to obtain a second image quality; and comparing the second image quality with the first image quality; if the second image quality is superior to the first image quality, using a third exposure duration ratio to shoot a third high dynamic range image, wherein the third exposure duration ratio is greater than the second exposure duration ratio; if the second image quality is not superior to the first image quality, using the first exposure duration ratio of the first high dynamic range image to shoot the third high dynamic range image and setting the first exposure duration ratio as an optimal exposure duration ratio.