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To consult the algorithm of photocopy filter

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To consult the algorithm of photocopy filter luming@shangyuekeji.com 15 Jul 02:57
  To consult the algorithm of photocopy filter Liam R E Quin 16 Jul 18:37
luming@shangyuekeji.com
2019-07-15 02:57:13 UTC (almost 5 years ago)

To consult the algorithm of photocopy filter

Dear all developers:
I want to consult the algorithm details of photocopy filter in photocopy.c, especially the paper or description. I don't understand the algorithm although I have read the description in photocopy.c. Thank you.

luming@shangyuekeji.com

Liam R E Quin
2019-07-16 18:37:41 UTC (almost 5 years ago)

To consult the algorithm of photocopy filter

On Mon, 2019-07-15 at 10:57 +0800, luming@shangyuekeji.com wrote:

Dear all developers:
I want to consult the algorithm details of photocopy filter in photocopy.c, especially the paper or description. I don't understand the algorithm although I have read the description in photocopy.c. Thank you.

Note, this is a gegl fillter; i don't know if there is a specific paper.

it looks like it does (more or less)

(1) make two blurred copies of the input with different radii (2) use these to make a histogram to count values & determing a threshhold
(3) for each input pixel, if the corresponding blurred value is less than the computed threshold, make it black (0 value) else make it brighter.

Liam (slave ankh)

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