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  /external/libvpx/libvpx/vpx_dsp/
psnrhvs.c 129 float s_means[4]; local
140 s_means[i] = d_means[i] = s_vars[i] = d_vars[i] = 0;
148 s_means[sub] += dct_s[i * 8 + j];
155 s_means[i] /= 16.f;
163 s_vars[sub] += (dct_s[i * 8 + j] - s_means[sub])
164 * (dct_s[i * 8 + j] - s_means[sub]);

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