Retinex low-illumination color image enhancement method based on variation constraint

A color image, variational constraint technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of loss of details in the highlighted area of ​​the enhanced image, inaccurate estimation of the illumination image, and insufficient contrast enhancement in the low-brightness area.
CN109872285AActive Publication Date: 2019-06-11UNIV OF ELECTRONICS SCI & TECH OF CHINA
2 Cites 18 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2019-06-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a Retinex low-illumination color image enhancement method based on variation constraint, and relates to the technical field of color image processing, the method comprises thefollowing steps: converting an original color image from an RGB space to an HSV space, and extracting an image of an intensity channel V as a grayscale image; constructing a conductivity weight matrixby using the extracted grayscale image; constructing an objective function by using an energy minimization principle, inputting the grayscale image and the conductance weight matrix into the objective function, and solving the objective function by using an alternating direction multiplier method to obtain an illumination image; Separating a reflection component from the original color image according to the illumination image to obtain a reflection image; The gray level image is reconstructed by using the illumination image and the reflection image; According to the method, the boundary of the image is well reserved, so that the estimated illumination image is more accurate, the reflection image contains more internal details and texture features of the image, the contrast ratio of the enhanced image is improved, and the details of the high-brightness position of the image are reserved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of color image processing, and more particularly relates to a Retinex low-illuminance color image enhancement method based on variation constraints. Background technique

[0002] Low-illuminance color images are low-light images taken in dark environments due to the limitations of light and image acquisition equipment. This kind of image is characterized by low brightness, high noise, and unclear details, which is difficult for the human eye to reproduce. Observation or recognition of computer systems, so it is necessary to process low-illuminance images to obtain higher-definition images. Image enhancement technology plays an important role in improving image quality. Through image enhancement, the brightness, contrast and detail information in the image can be improved, so that the enhanced image can better conform to the observation rules of the human eye and the computer image processing system. require...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More