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Rho is the size of the 'bucket' or accumulator array for all incoming rho, or distance from origin. The longest possible distance in an image is from the top left to bottom right, so for maximum accuracy, plug that value into houghlines rho.

Theta is the size of the bucket for all incoming theta. For maximum accuracy you need a value of 180. To only detect even angles, theta should be 90. to only detect angles divisible by 30, theta should be 6

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