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When Original image is enabled, the original image is then displayed. When is disabled, the image is displayed with a canny edge filter enabled (edges/outline of the image highlighted).
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Evaluation
When the end-user clicks on the ‘Evaluation’ button, a threshold can be set for line length, alongside comparison rules, then click ‘Enable'. Lastly, click on 'Save and Close’.
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Measurement is done in pixels, but if you e.g. put a ruler into an image where the object would be, you can compute the pixel-to-mm ratio and then use it in the Code module to evaluate the length of the lines. The lines are saved in /wiki/spaces/KB3141/pages/533529551 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
}
] |