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MfA · 23rd September 2004, 06:13

Does DCDi do a lerp between the 2 horizontal pixels before doing the average between the 2 lines or something? ELA with a wider aperture doesnt necessarily have to pick 2 opposing pixels to average straightaway ... you could first find the best match between two opposing X pixel vectors, and then do subpixel search. Just a couple more lerps.

BTW you might want to try local centered moments to determine isophote direction (can be implemented with running averages, so the amount of operations per pixel is pretty low ... it is probably cheaper than using DoG convolution masks greater than 3x3 for getting the gradient).

23rd September 2004, 06:13	#32 \| Link
MfA Registered User Join Date: Mar 2002 Posts: 1,075	Does DCDi do a lerp between the 2 horizontal pixels before doing the average between the 2 lines or something? ELA with a wider aperture doesnt necessarily have to pick 2 opposing pixels to average straightaway ... you could first find the best match between two opposing X pixel vectors, and then do subpixel search. Just a couple more lerps. BTW you might want to try local centered moments to determine isophote direction (can be implemented with running averages, so the amount of operations per pixel is pretty low ... it is probably cheaper than using DoG convolution masks greater than 3x3 for getting the gradient). Last edited by MfA; 23rd September 2004 at 06:34.