Calculates 2D Fast Hough transform of an image

dst = cv.FastHoughTransform(src)
dst = cv.FastHoughTransform(src, 'OptionName',optionValue, ...)

Input

• src The source (input) image.

Output

• dst The destination image, result of transformation.

Options

• DDepth The depth of destination image. Default int32.
• Op The operation to be applied. This specifies binary operations, that is such ones which involve two operands. Formally, a binary operation f on a set S is a binary relation that maps elements of the Cartesian product SxS to S: f: SxS -> S. Default 'Addition'. One of
  • Minimum Binary minimum operation. The constant specifies the binary minimum operation f that is defined as follows: f(x, y) = min(x, y).
  • Maximum Binary maximum operation. The constant specifies the binary maximum operation f that is defined as follows: f(x, y) = max(x, y).
  • Addition Binary addition operation. The constant specifies the binary addition operation f that is defined as follows: f(x, y) = x + y.
  • Average Binary average operation. The constant specifies the binary average operation f that is defined as follows: f(x, y) = (x + y)/2.
• AngleRange The part of Hough space to calculate. This specifies the part of Hough space to calculate. Each member specifies primarily direction of lines (horizontal or vertical) and the direction of angle changes. Direction of angle changes is from multiples of 90 to odd multiples of 45. The image considered to be written top-down and left-to-right. Angles are started from vertical line and go clockwise. Separate quarters and halves are written in orientation they should be in full Hough space. Default 'ARO315135'. One of:
  • ARO_0_45 Vertical primarily direction and clockwise angle changes.
  • ARO_45_90 Horizontal primarily direction and counterclockwise angle changes.
  • ARO_90_135 Horizontal primarily direction and clockwise angle changes.
  • ARO_315_0 Vertical primarily direction and counterclockwise angle changes.
  • ARO_315_45 Vertical primarily direction.
  • ARO_45_135 Horizontal primarily direction.
  • ARO_315_135 Full set of directions.
  • ARO_CTR_HOR 90 +/- atan(0.5), interval approximately from 64.5 to 116.5 degrees. It is used for calculating Fast Hough Transform for images skewed by atan(0.5).
  • ARO_CTR_VER 0 +/- atan(0.5), interval approximately from 333.5 (-26.5) to 26.5 degrees. It is used for calculating Fast Hough Transform for images skewed by atan(0.5).
• MakeSkew Specifies to do or not to do skewing of Hough transform image. The enum specifies to do or not to do skewing of Hough transform image so it would be no cycling in Hough transform image through borders of image. Default 'Deskew'. One of:
  • Raw Use raw cyclic image.
  • Deskew Prepare deskewed image.

The function calculates the fast Hough transform for full, half or quarter range of angles.