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In this window, the user selects [Noumenon Extraction], and extracts the pixel regions that
simultaneously meet the threshold values of three channels, namely the hue, brightness and
saturation of pixels in the image interval, by setting their threshold values, and displays them
visually in the lower right extraction diagram. Users can also filter out regions with too large and
too small regions by setting the extraction area ratio. If there is a hole in the middle of some
extracted regions, the user can check [Hole Filling] to fill it. Please refer to color extraction for
operation details here. This algorithm is generally used for noumenon inspection.
[OCV]: its principle is the same as that of the region method. It also uses image comparison,
but only compares the character part after black and white processing, as shown in the following
figure:
Click the "OCV" button to enter the OCV character segmentation window. The user can adjust