Patent ID: 9569857
Date: 2017-02-14
CPC Classifications: G06T

Claim:
1. A method of converting a digital image to a digital line drawing, the method comprising: forming a blank accumulator image with uniform pixel values from an input image; applying a smoothing operator to at least one channel image of the input image to form at least one smoothed image; applying a scaling operator to the at least one smoothed image to form at least one scaled image; applying a tone equalization operator to the at least one scaled image to form at least one equalized image; applying an edge detection operator to the at least one scaled image to form at least one edge image; applying a threshold operator to the at least one edge image to form at least one threshold image; combining the at least one threshold image with the blank accumulator image; and creating a digital line drawing with the combined at least one threshold image and the blank accumulator image.