Array image-based low-illumination image enhancement method

Abstract

The present invention discloses an array image-based low-illumination image enhancement method. The array image-based low-illuminance image enhancement method includes the following steps that: (1) array images under a low-illumination environment are obtained through an equal-focal length array lens; (2) preliminary enhancement is performed on the obtained array images one by one by using a multi-scale Retinex algorithm; (3) image sharpening is performed on the enhanced array images so as to enhance the edges of the array images; (4) multi-scale feature registration is carried out with a central image adopted as a reference image; (5) pixel value weighted averaging-based image fusion is performed on the images; (6) de-noising processing is performed on the enhanced images through using liner filtering; and (7) the format of the images is converted into an HSV format from an RGB format, and Retinex enhancement is performed on V channels. The method of the invention is effectively verified by a 3*3 array lens, and can be expected to extend the application range of mobile devices in the image enhancement field.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an array image-based low-illuminance image enhancement method, which can be used for image enhancement in low-illuminance environments. Background technique [0002] With the rapid development of electronic equipment and the popularization of the application of professional camera equipment, people are more and more able to take pictures with higher quality. However, in the actual photography process, there will always be various uncontrollable factors, resulting in various defects in the obtained pictures. In particular, due to the lack of light sources in the shooting environment or insufficient lighting conditions, the image is dark, resulting in low-light images. After the image is stored, converted, transmitted, etc., the quality of the low-light image is further reduced. Low-light images widely exist in people's lives. In order to ensure social publi...

AI Technical Summary

Problems solved by technology

However, the light field camera optical imaging systems of Lytro and Raytrix are equipped with microlens arrays, which are large in size and thick in thickness, and cannot be used in mobile devices such as mobile phones.

Images