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  /external/libvpx/vp8/encoder/
ssim.c 46 int mu_x2, mu_y2, mu_xy, theta_x2, theta_y2, theta_xy; local
50 mu_xy = mu_x * mu_y;
54 theta_xy = 64 * pre_mu_xy2 - mu_xy;
56 return (2 * mu_xy + C1) * (2 * theta_xy + C2) / ((mu_x2 + mu_y2 + C1) * (theta_x2 + theta_y2 + C2));

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