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cv::cvtColor (RGB5x52Gray)

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This commit is contained in:
Ilya Lavrenov 2014-10-06 13:06:08 -07:00
parent a84c4ac197
commit f91e461ea0
1 changed files with 61 additions and 3 deletions
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64
modules/imgproc/src/color.cpp
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@ -995,27 +995,85 @@ struct RGB5x52Gray
{
typedef uchar channel_type;
RGB5x52Gray(int _greenBits) : greenBits(_greenBits) {}
RGB5x52Gray(int _greenBits) : greenBits(_greenBits)
{
#if CV_NEON
v_b2y = vdup_n_u16(B2Y);
v_g2y = vdup_n_u16(G2Y);
v_r2y = vdup_n_u16(R2Y);
v_delta = vdupq_n_u32(1 << (yuv_shift - 1));
v_f8 = vdupq_n_u16(0xf8);
v_fc = vdupq_n_u16(0xfc);
#endif
}
void operator()(const uchar* src, uchar* dst, int n) const
{
int i = 0;
if( greenBits == 6 )
for( int i = 0; i < n; i++ )
{
#if CV_NEON
for ( ; i <= n - 8; i += 8)
{
uint16x8_t v_src = vld1q_u16((ushort *)src + i);
uint16x8_t v_t0 = vandq_u16(vshlq_n_u16(v_src, 3), v_f8),
v_t1 = vandq_u16(vshrq_n_u16(v_src, 3), v_fc),
v_t2 = vandq_u16(vshrq_n_u16(v_src, 8), v_f8);
uint32x4_t v_dst0 = vmlal_u16(vmlal_u16(vmull_u16(vget_low_u16(v_t0), v_b2y),
vget_low_u16(v_t1), v_g2y), vget_low_u16(v_t2), v_r2y);
uint32x4_t v_dst1 = vmlal_u16(vmlal_u16(vmull_u16(vget_high_u16(v_t0), v_b2y),
vget_high_u16(v_t1), v_g2y), vget_high_u16(v_t2), v_r2y);
v_dst0 = vshrq_n_u32(vaddq_u32(v_dst0, v_delta), yuv_shift);
v_dst1 = vshrq_n_u32(vaddq_u32(v_dst1, v_delta), yuv_shift);
vst1_u8(dst + i, vmovn_u16(vcombine_u16(vmovn_u32(v_dst0), vmovn_u32(v_dst1))));
}
#endif
for ( ; i < n; i++)
{
int t = ((ushort*)src)[i];
dst[i] = (uchar)CV_DESCALE(((t << 3) & 0xf8)*B2Y +
((t >> 3) & 0xfc)*G2Y +
((t >> 8) & 0xf8)*R2Y, yuv_shift);
}
}
else
for( int i = 0; i < n; i++ )
{
#if CV_NEON
for ( ; i <= n - 8; i += 8)
{
uint16x8_t v_src = vld1q_u16((ushort *)src + i);
uint16x8_t v_t0 = vandq_u16(vshlq_n_u16(v_src, 3), v_f8),
v_t1 = vandq_u16(vshrq_n_u16(v_src, 2), v_f8),
v_t2 = vandq_u16(vshrq_n_u16(v_src, 8), v_f8);
uint32x4_t v_dst0 = vmlal_u16(vmlal_u16(vmull_u16(vget_low_u16(v_t0), v_b2y),
vget_low_u16(v_t1), v_g2y), vget_low_u16(v_t2), v_r2y);
uint32x4_t v_dst1 = vmlal_u16(vmlal_u16(vmull_u16(vget_high_u16(v_t0), v_b2y),
vget_high_u16(v_t1), v_g2y), vget_high_u16(v_t2), v_r2y);
v_dst0 = vshrq_n_u32(vaddq_u32(v_dst0, v_delta), yuv_shift);
v_dst1 = vshrq_n_u32(vaddq_u32(v_dst1, v_delta), yuv_shift);
vst1_u8(dst + i, vmovn_u16(vcombine_u16(vmovn_u32(v_dst0), vmovn_u32(v_dst1))));
}
#endif
for ( ; i < n; i++)
{
int t = ((ushort*)src)[i];
dst[i] = (uchar)CV_DESCALE(((t << 3) & 0xf8)*B2Y +
((t >> 2) & 0xf8)*G2Y +
((t >> 7) & 0xf8)*R2Y, yuv_shift);
}
}
}
int greenBits;
#if CV_NEON
uint16x4_t v_b2y, v_g2y, v_r2y;
uint32x4_t v_delta;
uint16x8_t v_f8, v_fc;
#endif
};