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Searching a small image into a big one

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HellOfMice:
John,

That's right I join an image for what I want to do.
I search for a rectangular area but it can be an ellipse, or a polygon...
After I have applied the Sobel filter/operator I will use the SHA256.
I had forgotten SHA256 and did not Keccak which is too big and a bit slow.
You gave me the second question (that I wiil not send!)
Do you understand now?

A+

Philippe

John Z:
Yup I understand now :0

Clearly if the sub-image is not bounded by straight lines searching for a corner is useless.
will ponder more

John Z

HellOfMice:
Here is what I can have to search.
I have used CFE to create the sub-image because what I will find will not have the same number of color or could be converted in grey or may be compressed more so strange pixels are presents.
I have joint the mask that I will use.

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