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how to detect the center of the virtual quadrangle

image description image description

I wanna use the harris or contour to detect, but the effect is not so good.

how to detect the center of the virtual quadrangle

image description image description

I wanna use the harris or contour to detect, but the effect is not so good.

After color transformation, the image looks like this, image description

how to detect the center of the virtual quadrangle

image description image description

I wanna use the harris or contour to detect, but the effect is not so good.

After color transformation, the image looks like this, image description

Find the orientation image description

how to detect the center of the virtual quadrangle

image description image description

I wanna use the harris or contour to detect, but the effect is not so good.

After color transformation, the image looks like this, image description

Find the orientation image description

This is what i finally get. image description