From 0cd37886241ba8a5c7f3b7e46f28be195b147551 Mon Sep 17 00:00:00 2001
From: Vitaly Tuzov <terfendail@mediana.jetos.com>
Date: Tue, 1 Nov 2016 16:31:37 +0300
Subject: [PATCH] Added OpenVX based processing to threshold

---
 3rdparty/openvx/include/ivx.hpp |  20 ++++++
 modules/imgproc/src/thresh.cpp  | 105 ++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)

diff --git a/3rdparty/openvx/include/ivx.hpp b/3rdparty/openvx/include/ivx.hpp
index f47831d1c8..0ac2108d47 100644
--- a/3rdparty/openvx/include/ivx.hpp
+++ b/3rdparty/openvx/include/ivx.hpp
@@ -1823,6 +1823,26 @@ static const vx_enum
         query(VX_THRESHOLD_FALSE_VALUE, v);
         return v;
     }
+
+    /// vxSetThresholdAttribute(THRESHOLD_VALUE) wrapper
+    void setValue(vx_int32 &val)
+    { IVX_CHECK_STATUS(vxSetThresholdAttribute(ref, VX_THRESHOLD_THRESHOLD_VALUE, &val, sizeof(val))); }
+
+    /// vxSetThresholdAttribute(THRESHOLD_LOWER) wrapper
+    void setValueLower(vx_int32 &val)
+    { IVX_CHECK_STATUS(vxSetThresholdAttribute(ref, VX_THRESHOLD_THRESHOLD_LOWER, &val, sizeof(val))); }
+
+    /// vxSetThresholdAttribute(THRESHOLD_UPPER) wrapper
+    void setValueUpper(vx_int32 &val)
+    { IVX_CHECK_STATUS(vxSetThresholdAttribute(ref, VX_THRESHOLD_THRESHOLD_UPPER, &val, sizeof(val))); }
+
+    /// vxSetThresholdAttribute(TRUE_VALUE) wrapper
+    void setValueTrue(vx_int32 &val)
+    { IVX_CHECK_STATUS(vxSetThresholdAttribute(ref, VX_THRESHOLD_TRUE_VALUE, &val, sizeof(val))); }
+
+    /// vxSetThresholdAttribute(FALSE_VALUE) wrapper
+    void setValueFalse(vx_int32 &val)
+    { IVX_CHECK_STATUS(vxSetThresholdAttribute(ref, VX_THRESHOLD_FALSE_VALUE, &val, sizeof(val))); }
 };
 
 /// vx_array wrapper
diff --git a/modules/imgproc/src/thresh.cpp b/modules/imgproc/src/thresh.cpp
index a5273ecd7c..e7709ba3e0 100644
--- a/modules/imgproc/src/thresh.cpp
+++ b/modules/imgproc/src/thresh.cpp
@@ -44,6 +44,12 @@
 #include "opencl_kernels_imgproc.hpp"
 #include "opencv2/core/hal/intrin.hpp"
 
+#ifdef HAVE_OPENVX
+#define IVX_HIDE_INFO_WARNINGS
+#define IVX_USE_OPENCV
+#include "ivx.hpp"
+#endif
+
 namespace cv
 {
 
@@ -1244,6 +1250,99 @@ static bool ocl_threshold( InputArray _src, OutputArray _dst, double & thresh, d
 
 #endif
 
+
+#ifdef HAVE_OPENVX
+#define IMPL_OPENVX_TOZERO 1
+static bool openvx_threshold(Mat src, Mat dst, int thresh, int maxval, int type)
+{
+    Mat a = src;
+
+    int trueVal, falseVal;
+    switch (type)
+    {
+    case THRESH_BINARY:
+#ifndef VX_VERSION_1_1
+        if (maxval != 255)
+            return false;
+#endif
+        trueVal = maxval;
+        falseVal = 0;
+        break;
+    case THRESH_TOZERO:
+#if IMPL_OPENVX_TOZERO
+        trueVal = 255;
+        falseVal = 0;
+        if (dst.data == src.data)
+        {
+            a = Mat(src.size(), src.type());
+            src.copyTo(a);
+        }
+        break;
+#endif
+    case THRESH_BINARY_INV:
+#ifdef VX_VERSION_1_1
+        trueVal = 0;
+        falseVal = maxval;
+        break;
+#endif
+    case THRESH_TOZERO_INV:
+#ifdef VX_VERSION_1_1
+#if IMPL_OPENVX_TOZERO
+        trueVal = 0;
+        falseVal = 255;
+        if (dst.data == src.data)
+        {
+            a = Mat(src.size(), src.type());
+            src.copyTo(a);
+        }
+        break;
+#endif
+#endif
+    case THRESH_TRUNC:
+    default:
+        return false;
+    }
+
+    try
+    {
+        ivx::Context ctx = ivx::Context::create();
+
+        ivx::Threshold thh = ivx::Threshold::createBinary(ctx, VX_TYPE_UINT8, thresh);
+        thh.setValueTrue(trueVal);
+        thh.setValueFalse(falseVal);
+
+        ivx::Image
+            ia = ivx::Image::createFromHandle(ctx, VX_DF_IMAGE_U8,
+                ivx::Image::createAddressing(a.cols*a.channels(), a.rows, 1, (vx_int32)(a.step)), src.data),
+            ib = ivx::Image::createFromHandle(ctx, VX_DF_IMAGE_U8,
+                ivx::Image::createAddressing(dst.cols*dst.channels(), dst.rows, 1, (vx_int32)(dst.step)), dst.data);
+
+        ivx::IVX_CHECK_STATUS(vxuThreshold(ctx, ia, thh, ib));
+#if IMPL_OPENVX_TOZERO
+        if (type == THRESH_TOZERO || type == THRESH_TOZERO_INV)
+        {
+            ivx::Image
+                ic = ivx::Image::createFromHandle(ctx, VX_DF_IMAGE_U8,
+                    ivx::Image::createAddressing(dst.cols*dst.channels(), dst.rows, 1, (vx_int32)(dst.step)), dst.data);
+            ivx::IVX_CHECK_STATUS(vxuAnd(ctx, ib, ia, ic));
+        }
+#endif
+    }
+    catch (ivx::RuntimeError & e)
+    {
+        CV_Error(CV_StsInternal, e.what());
+        return false;
+    }
+    catch (ivx::WrapperError & e)
+    {
+        CV_Error(CV_StsInternal, e.what());
+        return false;
+    }
+
+    return true;
+}
+#endif
+
 }
 
 double cv::threshold( InputArray _src, OutputArray _dst, double thresh, double maxval, int type )
@@ -1296,6 +1395,12 @@ double cv::threshold( InputArray _src, OutputArray _dst, double thresh, double m
                 src.copyTo(dst);
             return thresh;
         }
+
+#ifdef HAVE_OPENVX
+        if (openvx_threshold(src, dst, ithresh, imaxval, type))
+            return thresh;
+#endif
+
         thresh = ithresh;
         maxval = imaxval;
     }