BIIGLE
Area calculation by laser points? #619
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I wondered if somebody can shed light on how exactly the image area is calculated in Biigle? I have performed laser annotation, and compared given image area ( in Biigle) with calculated area from x,y coordinates - and they are slightly different. See quick screenshot from excel (output from image with laser distance 8 cm, 1920x1088 pixel, Biigle output in orange). Am I missing something here? |
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You seem to calculate the laser distance only from the difference in x coordinates (in 1D). BIIGLE calculates the euclidean distance between the (x,y) points (in 2D). For the first pair of points, if you calculate √((1334.06 - 1244.06)² + (365.19 - 380.19)²) then you get a laser distance of 91.24 px. With a laser distance of 0.08 m this is 0.000876795 m/px and 0.000000769 m²/px. With 1920x1088 px you get 1.605928676 m² (1.61 m²). |
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I see, this makes sense! Thanks |
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You seem to calculate the laser distance only from the difference in x coordinates (in 1D). BIIGLE calculates the euclidean distance between the (x,y) points (in 2D). For the first pair of points, if you calculate √((1334.06 - 1244.06)² + (365.19 - 380.19)²) then you get a laser distance of 91.24 px. With a laser distance of 0.08 m this is 0.000876795 m/px and 0.000000769 m²/px. With 1920x1088 px you get 1.605928676 m² (1.61 m²).