if( bgrImage.type() != CV_8UC3 )
CV_Error( CV_StsBadArg, "input image must be an BGR image of type CV_8UC3" );
- // Split image into RGB to allow conversion to Opponent Color Space.
- vector<Mat> bgrChannels(3);
- split( bgrImage, bgrChannels );
-
// Prepare opponent color space storage matrices.
opponentChannels.resize( 3 );
opponentChannels[0] = cv::Mat(bgrImage.size(), CV_8UC1); // R-G RED-GREEN
opponentChannels[1] = cv::Mat(bgrImage.size(), CV_8UC1); // R+G-2B YELLOW-BLUE
opponentChannels[2] = cv::Mat(bgrImage.size(), CV_8UC1); // R+G+B
- // Calculate the channels of the opponent color space
- {
- // (R - G)/sqrt(2), but converted to the destination data type
- MatConstIterator_<signed char> rIt = bgrChannels[2].begin<signed char>();
- MatConstIterator_<signed char> gIt = bgrChannels[1].begin<signed char>();
- MatIterator_<unsigned char> dstIt = opponentChannels[0].begin<unsigned char>();
- for( ; dstIt != opponentChannels[0].end<unsigned char>(); ++rIt, ++gIt, ++dstIt )
- {
- float value = 0.5f * (static_cast<int>(*gIt) -
- static_cast<int>(*rIt) + 255);
- (*dstIt) = static_cast<unsigned char>(value + 0.5f);
- }
- }
- {
- // (R + G - 2B)/sqrt(6), but converted to the destination data type
- MatConstIterator_<signed char> rIt = bgrChannels[2].begin<signed char>();
- MatConstIterator_<signed char> gIt = bgrChannels[1].begin<signed char>();
- MatConstIterator_<signed char> bIt = bgrChannels[0].begin<signed char>();
- MatIterator_<unsigned char> dstIt = opponentChannels[1].begin<unsigned char>();
- for( ; dstIt != opponentChannels[1].end<unsigned char>(); ++rIt, ++gIt, ++bIt, ++dstIt )
+ for(int y = 0; y < bgrImage.rows; ++y)
+ for(int x = 0; x < bgrImage.cols; ++x)
{
- float value = 0.25f * (static_cast<int>(*rIt) + static_cast<int>(*gIt) -
- 2*static_cast<int>(*bIt) + 510);
- (*dstIt) = static_cast<unsigned char>(value + 0.5f);
+ Vec3b v = bgrImage.at<Vec3b>(y, x);
+ uchar& b = v[0];
+ uchar& g = v[1];
+ uchar& r = v[2];
+
+ opponentChannels[0].at<uchar>(y, x) = saturate_cast<uchar>(0.5f * (255 + g - r)); // (R - G)/sqrt(2), but converted to the destination data type
+ opponentChannels[1].at<uchar>(y, x) = saturate_cast<uchar>(0.25f * (510 + r + g - 2*b)); // (R + G - 2B)/sqrt(6), but converted to the destination data type
+ opponentChannels[2].at<uchar>(y, x) = saturate_cast<uchar>(1.f/3.f * (r + g + b)); // (R + G + B)/sqrt(3), but converted to the destination data type
}
- }
- {
- // (R + G + B)/sqrt(3), but converted to the destination data type
- MatConstIterator_<signed char> rIt = bgrChannels[2].begin<signed char>();
- MatConstIterator_<signed char> gIt = bgrChannels[1].begin<signed char>();
- MatConstIterator_<signed char> bIt = bgrChannels[0].begin<signed char>();
- MatIterator_<unsigned char> dstIt = opponentChannels[2].begin<unsigned char>();
- float factor = 1.f/3.f;
- for( ; dstIt != opponentChannels[2].end<unsigned char>(); ++rIt, ++gIt, ++bIt, ++dstIt )
- {
- float value = factor * (static_cast<int>(*rIt) +
- static_cast<int>(*gIt) +
- static_cast<int>(*bIt));
- (*dstIt) = static_cast<unsigned char>(value + 0.5f);
- }
- }
}
struct KP_LessThan
}
};
-typedef HResizeNoVec HResizeLinearVec_8u32s;
-typedef HResizeNoVec HResizeLinearVec_16u32f;
-typedef HResizeNoVec HResizeLinearVec_16s32f;
-typedef HResizeNoVec HResizeLinearVec_32f;
-typedef HResizeNoVec HResizeLinearVec_64f;
-
#else
-typedef HResizeNoVec HResizeLinearVec_8u32s;
-typedef HResizeNoVec HResizeLinearVec_16u32f;
-typedef HResizeNoVec HResizeLinearVec_16s32f;
-typedef HResizeNoVec HResizeLinearVec_32f;
-
typedef VResizeNoVec VResizeLinearVec_32s8u;
typedef VResizeNoVec VResizeLinearVec_32f16u;
typedef VResizeNoVec VResizeLinearVec_32f16s;
#endif
+typedef HResizeNoVec HResizeLinearVec_8u32s;
+typedef HResizeNoVec HResizeLinearVec_16u32f;
+typedef HResizeNoVec HResizeLinearVec_16s32f;
+typedef HResizeNoVec HResizeLinearVec_32f;
+typedef HResizeNoVec HResizeLinearVec_64f;
+
template<typename T, typename WT, typename AT, int ONE, class VecOp>
struct HResizeLinear
}
};
+template<>
+struct VResizeLinear<uchar, int, short, FixedPtCast<int, uchar, INTER_RESIZE_COEF_BITS*2>, VResizeLinearVec_32s8u>
+{
+ typedef uchar value_type;
+ typedef int buf_type;
+ typedef short alpha_type;
+
+ void operator()(const buf_type** src, value_type* dst, const alpha_type* beta, int width ) const
+ {
+ alpha_type b0 = beta[0], b1 = beta[1];
+ const buf_type *S0 = src[0], *S1 = src[1];
+ VResizeLinearVec_32s8u vecOp;
+
+ int x = vecOp((const uchar**)src, (uchar*)dst, (const uchar*)beta, width);
+ #if CV_ENABLE_UNROLLED
+ for( ; x <= width - 4; x += 4 )
+ {
+ dst[x+0] = uchar(( ((b0 * (S0[x+0] >> 4)) >> 16) + ((b1 * (S1[x+0] >> 4)) >> 16) + 2)>>2);
+ dst[x+1] = uchar(( ((b0 * (S0[x+1] >> 4)) >> 16) + ((b1 * (S1[x+1] >> 4)) >> 16) + 2)>>2);
+ dst[x+2] = uchar(( ((b0 * (S0[x+2] >> 4)) >> 16) + ((b1 * (S1[x+2] >> 4)) >> 16) + 2)>>2);
+ dst[x+3] = uchar(( ((b0 * (S0[x+3] >> 4)) >> 16) + ((b1 * (S1[x+3] >> 4)) >> 16) + 2)>>2);
+ }
+ #endif
+ for( ; x < width; x++ )
+ dst[x] = uchar(( ((b0 * (S0[x] >> 4)) >> 16) + ((b1 * (S1[x] >> 4)) >> 16) + 2)>>2);
+ }
+};
+
template<typename T, typename WT, typename AT>
struct HResizeCubic