Fig. 10
From: A two-stage defect detection method for unevenly illuminated self-adhesive printed materials
The brightness correction and filtering effects under different parameters. (a) The pixel value distribution ranges of the three intervals for the original image and reference image are ([58,62][70,75][200,205]) and ([70,75][70,75][170,175]), respectively. (b) The pixel value distribution ranges of the three intervals for the images are ([55,65][75,85][120,170]). The horizontal axis in the graphs represents the pixel coordinates of the image, while the vertical axis represents the pixel value. The red profile line indicates the pixel value variation of the 100th row of pixels in the image.
