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swim
2026-08-07 15:56:42 +09:00
commit 91ad25aca9
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tomo/utils/TVDerivative.m
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function Vst = TVDerivative(img)
fxy = padarray(img, [1,1], 0, 'both');
fxnegy = circshift(fxy, [-1, 0]);
fxposy = circshift(fxy, [1, 0]);
fnegxy = circshift(fxy, [0, -1]);
fposxy = circshift(fxy, [0, 1]);
fposxnegy = circshift(fxy, [-1 1]);
fnegxposy = circshift(fxy, [1 -1]);
eps = realmin;
vst1 = (2*(fxy - fnegxy) + 2*(fxy - fxnegy))./sqrt(eps + (fxy - fnegxy).^2 ...
+ (fxy - fxnegy).^2);
vst2 = (2*(fposxy - fxy))./sqrt(eps + (fposxy - fxy).^2 ...
+ (fposxy - fposxnegy).^2);
vst3 = (2*(fxposy - fxy))./sqrt(eps + (fxposy - fxy).^2 ...
+ (fxposy - fnegxposy).^2);
vst = vst1 - vst2 - vst3;
Vst = vst(2:end-1,2:end-1);
end