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I have some sheet on a conveyor belt, with a camera positioned above a corner of the sheet,I have to detect the position ,recognizing the corner compared to the cartesian axes (x, y),and i have to measure the distance between the origin of cartesian axes and my corner. Do you have any advice on the method to use or on which technique i have to rely? I thought to recognize the angle, through the 90 ° angle that is formed between one side of the sheet and the other, but I do not know how to do it.

I have some sheet on a conveyor belt, with a camera positioned above a corner of the sheet,I have to detect the position ,recognizing the corner compared to the cartesian axes (x, y),and i have to measure the distance between the origin of cartesian axes and my corner. Do you have any advice on the method to use or on which technique i have to rely? I thought to recognize the angle, through the 90 ° angle that is formed between one side of the sheet and the other, but I do not know how to do it.