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You can find more about it in Preprocess article - Canny Edge Detector.
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Measurement is done in pixels, but if you e.g. put ruler into an image where the object would be, you can compute the pixel to mm ratio and then use it in Code module to evaluate the length of the lines. The lines are saved in Context in this format:
| Code Block |
|---|
"lines": [
{
"id": 1651502661344,
"label": "Line1",
"start": {
"x": 165,
"y": 479
},
"end": {
"x": 158,
"y": 4
},
"angle": 1.5560605513728232,
"length": 475
},
{
"id": 1651502665897,
"label": "Line2",
"start": {
"x": 436,
"y": 479
},
"end": {
"x": 436,
"y": 4
},
"angle": 1.5707963267948966,
"length": 475
}
] |
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