The original image

AngKorWat_original.gif (86526 bytes)

After conversion to grey scale, and convolution with a smoothing kernel

AngKorWat_grey_smooth.gif (42992 bytes)

After convolution with a Laplacian edge detection kernel

AngKorWat_edges.gif (23150 bytes)

The above image equivalent in a 150x150 Hough space showing 15 selected peaks, each of which should correspond to lines in the image

AngKorWat_Hough.gif (17906 bytes)

The 15 selected Hough transform peaks represented as lines in the original image, with the original alongside

AngKorWat_lines.gif (93628 bytes)AngKorWat_original.gif (86526 bytes)