More complex processing could be performed. The sum of the pixels in the segments will be less than the image size, as the white lines are not counted as in any segment. %IMG7%magick %lsTEMPIMG% ca_segs.png 0,0,0,IsEdge ListSegments.bat lists the first three of those: call %PICTBAT%listSegments ca_smth2.png ca_segs.lis the coordinates of a seed point within the segment furthest from a segment boundary.whether the segment touches the image edge.the coordinates of a seed point within the segment.The segment image (white lines on black background) divides the source image into segments. Using potrace to smooth lines, the angles between lines, and between each line and an edge, have been unchanged. alpha set -channel A -evaluate set 50%% +channel ^ %POTRACEDIR%potrace -r 90 -s -o ca_smth.svg ca_smth.pnm Similarly, where three lines met at a T-junction, lines are now curved so they meet at 120°. Lines that previously hit an edge at an angle are now more perpendicular to the edge, sadly. ( ca_smth2.png -alpha set -channel A -evaluate set 50%% +channel ) ^ Blurring also shrinks loops, closing some of them. We can smooth the lines by (a) bluring, thresholding and repeating in IM or (b) using potrace.
( ca_smth.png -alpha set -channel A -evaluate set 50%% +channel ) ^ Skeleton:3 would break lines I don't want broken, Increasing the disk size closes gaps we want closed, The same four Canny edges, but RMS of channels instead of separating: %IMG7%magick ^īlah. We can combine edges from multiple colorspaces. for /F "usebackq" %%C in (`%IMG7%magick -list colorspace`) do ( We can segment an image with the Canny edge detector.Ī source image.
Even so, the central point still isn't closed. When the low threshold is set very low, spurious edges are found within each wedge. However, at their closest, they are as close as adjacent values in either side.
We can see that each value in the upper half is different to the corresponding value in the lower half. The values at the centre are: %IMG7%magick ^ radiusx sigma applies an initial Gausian blur. The syntax is " -canny radiusx sigma+ lower_percent+ upper_percent". Snibgo's ImageMagick pages Canny edge detectionĬanny (and other types of) edges can segment images.
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