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Lens shadow compensation method and device, storage medium and terminal

A technology of lens shadow and compensation method, which is applied in the field of image processing and can solve the problems of poor image effect and enlarged image noise.

Active Publication Date: 2020-07-03
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is how to increase the brightness of the surrounding area of ​​the original image while avoiding image noise from being amplified in a dark environment, resulting in poor image effects

Method used

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  • Lens shadow compensation method and device, storage medium and terminal
  • Lens shadow compensation method and device, storage medium and terminal
  • Lens shadow compensation method and device, storage medium and terminal

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Embodiment Construction

[0036] As mentioned in the background technology, when the existing technology is used to perform lens shading compensation processing on the original image in a dark environment, the noise in the image will be amplified while the effective image signal is amplified, which will make the image effect worse .

[0037] Taking the fishnet method as an example, the specific operation of this method includes the calibration phase and the operation phase.

[0038] In the calibration stage, an image is taken against the gray card in a standard light box with uniform brightness. The original image obtained is an image with a bright center and gradually darkened surroundings. Then the original image is input to the LSC correction coefficient calculation module to obtain the LSC compensation coefficient. The output LSC compensation coefficient is a fishnet-like two-dimensional compensation coefficient table with a size of M×N. Wherein, M×N may be smaller than the size of the original i...

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Abstract

The invention discloses a lens shadow compensation method and device, a storage medium and a terminal. The method comprises the steps that an original image and an initial LSC compensation coefficientare acquired; acquiring ambient brightness when the original image is acquired; adjusting the initial LSC compensation coefficient according to the ambient brightness to obtain an adjusted LSC compensation coefficient, the lower the ambient brightness is, the larger the compression amplitude of the adjusted LSC compensation coefficient is than that of the initial LSC compensation coefficient; andperforming lens shadow compensation processing on the original image according to the adjusted LSC compensation coefficient to obtain a processed image. Through the scheme of the invention, the lensshadow compensation degree of the original image can be dynamically and adaptively adjusted according to the ambient brightness, so that the brightness of the surrounding area of the original image isproperly improved, and the image effect is prevented from becoming worse due to the fact that the image noise is increased in a dark environment.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a lens shading compensation method and device, a storage medium, and a terminal. Background technique [0002] Due to the physical characteristics of the lens, the amount of light passing through it gradually decreases from the center to the periphery. Therefore, the original image captured by a lens such as a mobile phone camera will appear bright in the center and gradually darken around, which seriously affects the image quality. [0003] Currently, a common processing method in the industry is to perform lens shading correction (Lens Shading Correction, LSC for short, also referred to as lens shading compensation) processing on the original image, so as to improve the image quality. [0004] Because the brightness performance of the original image is that the brightness of the central pixel is larger, and the brightness of the surrounding pixels decreases (t...

Claims

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Application Information

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IPC IPC(8): H04N5/357
CPCH04N25/61
Inventor 胡继瑶张春雷熊佳彭晓峰
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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