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``
4 L y9 @ {# A$ p0 a5 U. Y7 i* P- Wclear all
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4 K, F* z5 @ r0 s# P7 [) _! Wim = imread(‘1.bmp’);' ?# O1 \' p9 E+ v
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quality = CCF(im)
& m+ q% o1 a1 M1 \, f/ _; C9 m4 F3 @ Pfunction [quality] = CCF(im)
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%-------------CCF_coloRFulness -----------------9 C+ j& Q4 G3 R
imColor = double(im);: Z8 t) `! q# a9 [: h' F, @6 w: x
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- R = imColor(:,:,1);
- G = imColor(:,:,2);
- B = imColor(:,:,3);
- RR = log(R+0.00001) - mean2(log(R+0.00001));
- GG = log(G+0.00001) - mean2(log(G+0.00001));
- BB = log(B+0.00001) - mean2(log(B+0.00001));
- alpha = RR-GG;
- beta = 0.5*(RR+GG)-BB;
- mu_alpha=mean(mean(alpha));
- mu_beta=mean(mean(beta));
- var_alpha=var(var(alpha));
- var_beta=var(var(beta));
- CCF_colorfulness=1000*((sqrt(var_alpha+var_beta)+0.3*sqrt(mu_alpha*mu_alpha+mu_beta*mu_beta))/85.59);& j6 k1 e3 @( q; \( q% n) |! `7 l
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%-------------CCF_contrast----------------------
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- im1=rgb2gray(im);
- CCF_contrast = CCFcontrast(im1);
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& n" J" w, s1 H%-------------CCF_FADE--------------------------$ Q2 d' f1 `5 Y8 {; T# A2 o
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- CCF_FADE = FADE(im);
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; f& I; p$ S2 R* H/ x7 k%------------ normalization ------------------
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7 ?2 B; b: h5 D0 [* m p- CCF_colorfulness=mapminmax(CCF_colorfulness,1,10);
- CCF_contrast=mapminmax(CCF_contrast,1,10);
- CCF_FADE=10-mapminmax(CCF_FADE,1,10);. c8 G, I- a8 D4 ]% ]; y. N
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8 [5 ?; J/ `8 p9 \! i) m( a! q* z. y7 U% ------------calculate image quality with coefficients---------------------1 x- [& z+ l9 P) s
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- c=[0.17593 0.61759 0.33988 ];
- quality = c(1)*(CCF_colorfulness) + c(2)*(CCF_contrast) + c(3)*(CCF_FADE)
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