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Procedure to
Accumulate Lines
• Set
accumulator array A to all zero.
Set point list array PTLIST to all NIL.
• For each
pixel (R,C) in the image {
• compute
gradient magnitude GMAG
• if GMAG >
gradient_threshold {
• compute
quantized tangent angle THETAQ
• compute
quantized distance to origin DQ
• increment
A(DQ,THETAQ)
• update PTLIST(DQ,THETAQ) } }