Added enviroment search paths for OpenNI2 for linux and fixed specific warning

cmake/OpenCVFindOpenNI2.cmake

@@ -21,8 +21,8 @@ if(WIN32)
         find_library(OPENNI2_LIBRARY "OpenNI2" PATHS $ENV{OPENNI2_LIB64} DOC "OpenNI2 library")
     endif()
 elseif(UNIX OR APPLE)
-    find_file(OPENNI2_INCLUDES "OpenNI.h" PATHS "/usr/include/ni2" "/usr/include/openni2" DOC "OpenNI2 c++ interface header")
-    find_library(OPENNI2_LIBRARY "OpenNI2" PATHS "/usr/lib" DOC "OpenNI2 library")
+    find_file(OPENNI2_INCLUDES "OpenNI.h" PATHS "/usr/include/ni2" "/usr/include/openni2" $ENV{OPENNI2_INCLUDE} DOC "OpenNI2 c++ interface header")
+    find_library(OPENNI2_LIBRARY "OpenNI2" PATHS "/usr/lib" $ENV{OPENNI2_REDIST} DOC "OpenNI2 library")
 endif()
 
 if(OPENNI2_LIBRARY AND OPENNI2_INCLUDES)

modules/videoio/src/cap_openni2.cpp

@@ -821,10 +821,10 @@ IplImage* CvCapture_OpenNI2::retrieveValidDepthMask()
     if (!depthFrame.isValid())
         return 0;
 
-    cv::Mat depth;
-    getDepthMapFromMetaData(depthFrame, depth, noSampleValue, shadowValue);
+    cv::Mat d;
+    getDepthMapFromMetaData(depthFrame, d, noSampleValue, shadowValue);
 
-    outputMaps[CV_CAP_OPENNI_VALID_DEPTH_MASK].mat = depth != CvCapture_OpenNI2::INVALID_PIXEL_VAL;
+    outputMaps[CV_CAP_OPENNI_VALID_DEPTH_MASK].mat = d != CvCapture_OpenNI2::INVALID_PIXEL_VAL;
 
     return outputMaps[CV_CAP_OPENNI_VALID_DEPTH_MASK].getIplImagePtr();
 }