Fixed docs and added tests for Linemod 16U depth case

modules/rgbd/include/opencv2/rgbd.hpp

@@ -127,7 +127,7 @@ namespace rgbd
     /** Constructor
      * @param rows the number of rows of the depth image normals will be computed on
      * @param cols the number of cols of the depth image normals will be computed on
-     * @param depth the depth of the normals (only CV_32F or CV_64F for FALS and SRI, CV_16U for LINEMOD)
+     * @param depth the depth of the normals (only CV_32F or CV_64F)
      * @param K the calibration matrix to use
      * @param window_size the window size to compute the normals: can only be 1,3,5 or 7
      * @param method one of the methods to use: RGBD_NORMALS_METHOD_SRI, RGBD_NORMALS_METHOD_FALS
@@ -234,7 +234,7 @@ namespace rgbd
     }
 
     /** Constructor
-     * @param depth the depth of the normals (only CV_32F or CV_64F for FALS and SRI, CV_16U for LINEMOD)
+     * @param depth the depth of the normals (only CV_32F or CV_64F)
      * @param window_size the window size to compute the normals: can only be 1,3,5 or 7
      * @param method one of the methods to use: RGBD_NORMALS_METHOD_SRI, RGBD_NORMALS_METHOD_FALS
      */

modules/rgbd/src/normal.cpp

@@ -38,7 +38,7 @@
 namespace cv
 {
 namespace rgbd
-{    
+{
   /** Just compute the norm of a vector
    * @param vec a vector of size 3 and any type T
    * @return
@@ -133,6 +133,7 @@ namespace rgbd
       res = -normal_in / norm_vec(normal_in);
     else
       res = normal_in / norm_vec(normal_in);
+
     normal_out[0] = res[0];
     normal_out[1] = res[1];
     normal_out[2] = res[2];
@@ -434,6 +435,7 @@ multiply_by_K_inv(const Matx<T, 3, 3> & K_inv, U a, U b, U c, Vec<T, 3> &res)
       Vec3T X1_minus_X, X2_minus_X;
 
       ContainerDepth difference_threshold = 50;
+      normals.setTo(std::numeric_limits<DepthDepth>::quiet_NaN());
       for (int y = r; y < rows_ - r - 1; ++y)
       {
         const DepthDepth * p_line = reinterpret_cast<const DepthDepth*>(depth.ptr(y, r));

modules/rgbd/test/test_normal.cpp

@@ -35,6 +35,7 @@
 
 #include "test_precomp.hpp"
 #include <opencv2/rgbd.hpp>
+#include <opencv2/calib3d.hpp>
 
 namespace cv
 {
@@ -77,7 +78,7 @@ void TickMeter::stop()
         return;
 
     ++counter;
-    
+
     sumTime += ( time - startTime );
     startTime = 0;
 }
@@ -129,6 +130,35 @@ float cy = H / 2.f + 0.5f;
 Mat K = (Mat_<double>(3, 3) << focal_length, 0, cx, 0, focal_length, cy, 0, 0, 1);
 Mat Kinv = K.inv();
 
+void points3dToDepth16U(const Mat_<Vec3f>& points3d, Mat& depthMap);
+
+void points3dToDepth16U(const Mat_<Vec3f>& points3d, Mat& depthMap)
+{
+  std::vector<Point3f> points3dvec;
+  for(int i = 0; i < H; i++)
+    for(int j = 0; j < W; j++)
+      points3dvec.push_back(Point3f(points3d(i,j)[0], points3d(i,j)[1], points3d(i,j)[2]));
+
+  std::vector<Point2f> img_points;
+  depthMap = Mat::zeros(H, W, CV_32F);
+  Vec3f R(0.0,0.0,0.0);
+  Vec3f T(0.0,0.0,0.0);
+  cv::projectPoints(points3dvec, R, T, K, Mat(), img_points);
+
+  int index = 0;
+  for(int i = 0; i < H; i++)
+  {
+
+    for(int j = 0; j < W; j++)
+    {
+      float value = (points3d.at<Vec3f>(i, j))[2]; // value is the z
+      depthMap.at<float>(cvRound(img_points[index].y), cvRound(img_points[index].x)) = value;
+      index++;
+    }
+  }
+  depthMap.convertTo(depthMap, CV_16U, 1000);
+}
+
 static RNG rng;
 struct Plane
 {
@@ -224,8 +254,8 @@ protected:
         // inner vector: whether it's 1 plane or 3 planes
         // outer vector: float or double
         std::vector<std::vector<float> > errors(2);
-        errors[0].resize(2);
+        errors[0].resize(4);
-        errors[1].resize(2);
+        errors[1].resize(4);
         switch (i)
         {
           case 0:
@@ -241,8 +271,13 @@ protected:
             std::cout << std::endl << "*** LINEMOD" << std::endl;
             errors[0][0] = 0.04f;
             errors[0][1] = 0.07f;
+            errors[0][2] = 0.04f; // depth 16U 1 plane
+            errors[0][3] = 0.07f; // depth 16U 3 planes
+
             errors[1][0] = 0.05f;
             errors[1][1] = 0.08f;
+            errors[1][2] = 0.05f; // depth 16U 1 plane
+            errors[1][3] = 0.08f; // depth 16U 3 planes
             break;
           case 2:
             method = RgbdNormals::RGBD_NORMALS_METHOD_SRI;
@@ -271,7 +306,7 @@ protected:
           std::vector<Plane> plane_params;
           Mat points3d, ground_normals;
           // 1 plane, continuous scene, very low error..
-          std::cout << "1 plane" << std::endl;
+          std::cout << "1 plane - input 3d points" << std::endl;
           float err_mean = 0;
           for (int ii = 0; ii < 5; ++ii)
           {
@@ -291,6 +326,34 @@ protected:
           }
           std::cout << "mean diff: " << (err_mean / 5) << std::endl;
           EXPECT_LE(err_mean/5, errors[j][1])<< "mean diff: " << (err_mean/5) << " thresh: " << errors[j][1] << std::endl;
+
+          if(method == RgbdNormals::RGBD_NORMALS_METHOD_LINEMOD)
+          {
+            // depth 16U test
+            std::cout << "** depth 16U - 1 plane" << std::endl;
+            err_mean = 0;
+            for (int ii = 0; ii < 5; ++ii)
+            {
+              gen_points_3d(plane_params, plane_mask, points3d, ground_normals, 1);
+              Mat depthMap;
+              points3dToDepth16U(points3d, depthMap);
+              err_mean += testit(depthMap, ground_normals, normals_computer);
+            }
+            std::cout << "mean diff: " << (err_mean / 5) << std::endl;
+            EXPECT_LE(err_mean/5, errors[j][2])<< " thresh: " << errors[j][2] << std::endl;
+
+            std::cout << "** depth 16U - 3 plane" << std::endl;
+            err_mean = 0;
+            for (int ii = 0; ii < 5; ++ii)
+            {
+              gen_points_3d(plane_params, plane_mask, points3d, ground_normals, 3);
+              Mat depthMap;
+              points3dToDepth16U(points3d, depthMap);
+              err_mean += testit(depthMap, ground_normals, normals_computer);
+            }
+            std::cout << "mean diff: " << (err_mean / 5) << std::endl;
+            EXPECT_LE(err_mean/5, errors[j][3])<< "mean diff: " << (err_mean/5) << " thresh: " << errors[j][3] << std::endl;
+          }
         }
       }
 
@@ -309,7 +372,7 @@ protected:
     TickMeter tm;
     tm.start();
     Mat in_normals;
-    if (normals_computer.getMethod() == RgbdNormals::RGBD_NORMALS_METHOD_LINEMOD)
+    if (normals_computer.getMethod() == RgbdNormals::RGBD_NORMALS_METHOD_LINEMOD && points3d.channels() == 3)
     {
       std::vector<Mat> channels;
       split(points3d, channels);