Projects / Machine Vision Pleat Counting

Machine Vision Pleat Counting

Upload a photo of a pleated filter and the face is perspective-corrected before counting. Ridges are found by autocorrelation, the frame and grating are detected and excluded, and pitch, pleats-per-foot, and open area are reported — entirely in the browser.

Perspective-corrected ridge detectionno image
Drop a filter photo here
or click to choose  ·  JPG PNG HEIC→JPG
Ridge intensity trace · detrended · click to add or remove a pleat—
4

Results

×
Pleats
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Media area
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Pitch
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Pleats / ft
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Open area
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Opens the pleated filter performance calculator on a new page with the face size, pleat depth, pleat count, and grating blockage pre-filled.
1

Frame the face

Corners snap to the pleated area automatically — the smooth, bright frame is excluded. Drag the purple dots to fine-tune; the rectified view in step 3 shows exactly what falls inside the frame.

face outlinepleat ridgemanual linegrating
2

Count pleats

35
0.60×
0°

Spacing is a fraction of the detected pitch — go low for minipleats. Orientation forces the ridge direction if auto picks wrong; the tilt guide recenters the ±12° lean search for strongly tilted pleats. Everything recounts when a setting changes. Tap the image, or click in the trace below it, to add a missed ridge or remove a false one.

Waiting for image.
3

Frame & grating

205
12

Frame strips and grating are bright and smooth. Tune until the pink shading hugs them without eating into the pleat ridges.

Rectified face · pink = blocked—