The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2026
Filed:
Oct. 25, 2024
Wuhan University, Hubei, CN;
Shengnan Shen, Hubei, CN;
Hui Li, Hubei, CN;
Jiafeng Xiao, Hubei, CN;
Wei Han, Hubei, CN;
Xuechun Wang, Hubei, CN;
WUHAN UNIVERSITY, Hubei, CN;
Abstract
The present invention discloses a low light image enhancement method for online visual monitoring of metal additive manufacturing process. A video of the metal additive manufacturing process is captured using a high-speed camera and exported frame by frame to construct a low light and bright light image dataset. Based on Retinex vision theory, a low light image enhancement network model is constructed, and the reflection and illumination maps are fused into an enhanced image and the loss function value is calculated to complete the iterative training of the low light image enhancement network model. The low light image enhancement network model is deployed to the online monitoring hardware platform to calculate the image quality evaluation indexes. The present invention overcomes the difficulties of the low light environment of the metal additive manufacturing process online visual monitoring images with a lot of noise and poor geometric feature extraction accuracy.