added cv::blendLinear

modules/imgproc/src/blend.cpp

@@ -0,0 +1,145 @@
+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2010-2012, Multicoreware, Inc., all rights reserved.
+// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// @Authors
+//    Nathan, liujun@multicorewareinc.com
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#include "precomp.hpp"
+#include "opencl_kernels.hpp"
+
+namespace cv {
+
+template <typename T>
+class BlendLinearInvoker :
+        public ParallelLoopBody
+{
+public:
+    BlendLinearInvoker(const Mat & _src1, const Mat & _src2, const Mat & _weights1,
+                       const Mat & _weights2, Mat & _dst) :
+        src1(&_src1), src2(&_src2), weights1(&_weights1), weights2(&_weights2), dst(&_dst)
+    {
+    }
+
+    virtual void operator() (const Range & range) const
+    {
+        int cn = src1->channels(), width = src1->cols * cn;
+
+        for (int y = range.start; y < range.end; ++y)
+        {
+            const float * const weights1_row = weights1->ptr<float>(y);
+            const float * const weights2_row = weights2->ptr<float>(y);
+            const T * const src1_row = src1->ptr<T>(y);
+            const T * const src2_row = src2->ptr<T>(y);
+            T * const dst_row = dst->ptr<T>(y);
+
+            for (int x = 0; x < width; ++x)
+            {
+                int x1 = x / cn;
+                float w1 = weights1_row[x1], w2 = weights2_row[x1];
+                float den = (w1 + w2 + 1e-5f);
+                float num = (src1_row[x] * w1 + src2_row[x] * w2);
+
+                dst_row[x] = saturate_cast<T>(num / den);
+            }
+        }
+    }
+
+private:
+    const BlendLinearInvoker & operator= (const BlendLinearInvoker &);
+    BlendLinearInvoker(const BlendLinearInvoker &);
+
+    const Mat * src1, * src2, * weights1, * weights2;
+    Mat * dst;
+};
+
+static bool ocl_blendLinear( InputArray _src1, InputArray _src2, InputArray _weights1, InputArray _weights2, OutputArray _dst )
+{
+    int type = _src1.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
+
+    char cvt[30];
+    ocl::Kernel k("blendLinear", ocl::imgproc::blend_linear_oclsrc,
+                  format("-D T=%s -D cn=%d -D convertToT=%s", ocl::typeToStr(depth),
+                         cn, ocl::convertTypeStr(CV_32F, depth, 1, cvt)));
+    if (k.empty())
+        return false;
+
+    UMat src1 = _src1.getUMat(), src2 = _src2.getUMat(), weights1 = _weights1.getUMat(),
+            weights2 = _weights2.getUMat(), dst = _dst.getUMat();
+
+    k.args(ocl::KernelArg::ReadOnlyNoSize(src1), ocl::KernelArg::ReadOnlyNoSize(src2),
+           ocl::KernelArg::ReadOnlyNoSize(weights1), ocl::KernelArg::ReadOnlyNoSize(weights2),
+           ocl::KernelArg::WriteOnly(dst));
+
+    size_t globalsize[2] = { dst.cols, dst.rows };
+    return k.run(2, globalsize, NULL, false);
+}
+
+}
+
+void cv::blendLinear( InputArray _src1, InputArray _src2, InputArray _weights1, InputArray _weights2, OutputArray _dst )
+{
+    int type = _src1.type(), depth = CV_MAT_DEPTH(type);
+    Size size = _src1.size();
+
+    CV_Assert(depth == CV_8U || depth == CV_32F);
+    CV_Assert(size == _src2.size() && size == _weights1.size() && size == _weights2.size());
+    CV_Assert(type == _src2.type() && _weights1.type() == CV_32FC1 && _weights2.type() == CV_32FC1);
+
+    _dst.create(size, type);
+
+    if (ocl::useOpenCL() && _dst.isUMat() && ocl_blendLinear(_src1, _src2, _weights1, _weights2, _dst))
+        return;
+
+    Mat src1 = _src1.getMat(), src2 = _src2.getMat(), weights1 = _weights1.getMat(),
+            weights2 = _weights2.getMat(), dst = _dst.getMat();
+
+    if (depth == CV_8U)
+    {
+        BlendLinearInvoker<uchar> invoker(src1, src2, weights1, weights2, dst);
+        parallel_for_(Range(0, src1.rows), invoker, dst.total()/(double)(1<<16));
+    }
+    else if (depth == CV_32F)
+    {
+        BlendLinearInvoker<float> invoker(src1, src2, weights1, weights2, dst);
+        parallel_for_(Range(0, src1.rows), invoker, dst.total()/(double)(1<<16));
+    }
+}