why the order of colors in drawChessboardCorners() changes?

asked 2020-09-12 16:29:05 -0600

Abeer0d
21 ●1

updated 2020-09-13 04:05:38 -0600

6772 ●3 ●48 ●79 https://github.com/stu...

I'm doing camera calibration and I noticed that images could have different order in coloring when using the function (drawchessboardcorner) and I removed the images that don't match the dominant order to see the difference in the final result and the mean error decreased a bit (from 0.1 to 0.08), does that mean anything?

here's the two images

image description

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You have to use the asymmetric chessboard pattern if you want to have unique chessboard pose.

Eduardo ( 2020-09-13 04:41:26 -0600 )edit

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answered 2020-09-13 03:41:17 -0600

berak
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updated 2020-09-13 04:17:10 -0600

the color is choosen according to the y position in the image, so that's pretty arbitrary, meaningless.

on the other hand, if you notice a color difference it means, e.g the y position for the top-left quare is not the same in the left and right image, so you either tilted the whole camera pair , or one of them does not look straight, please check.

again, the epilines later must be absolutely horizontal, so take care to align your cams properly.