- Pseudo-color gradated display
- Original image
Differences in freshness are displayed in color, making them easier to see.0 is black, 255 is white, and the colors between change from blue to light blue, green, yellow, and red.
- Sharpening + variable threshold
- Sharpening + variable threshold + synthesis with original image
"Sharpening" refers to a uniform binarization of an image by changing the threshold for each image, even for images with uneven illumination.A variable threshold extracts the areas with significant differences in brightness compared to the original image to create a crisp, clear image.