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Update contrast_preserve.hpp
fix a build warning: ``` C:\Slave\workspace\precommit\windows10\opencv\modules\photo\src\contrast_preserve.hpp(289): warning C4244: '=': conversion from 'double' to '_Tp', possible loss of data with [ _Tp=float ] C:\Slave\workspace\precommit\windows10\opencv\modules\photo\src\contrast_preserve.hpp(361): warning C4244: '=': conversion from 'double' to '_Tp', possible loss of data with [ _Tp=float ] ``` (from https://build.opencv.org.cn/job/precommit/job/windows10/1633/console)
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@ -285,9 +285,9 @@ void Decolor::grad_system(const Mat &im, vector < vector < double > > &polyGrad,
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add_vector(comb,idx,r,g,b);
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for(int i = 0;i<h;i++)
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for(int j=0;j<w;j++)
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curIm.at<float>(i,j)=
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curIm.at<float>(i,j)=static_cast<float>(
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pow(rgb_channel[2].at<float>(i,j),r)*pow(rgb_channel[1].at<float>(i,j),g)*
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pow(rgb_channel[0].at<float>(i,j),b);
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pow(rgb_channel[0].at<float>(i,j),b));
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vector <double> curGrad;
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gradvector(curIm,curGrad);
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add_to_vector_poly(polyGrad,curGrad,idx1);
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