fix already defined macro variable

modules/line_descriptor/src/binary_descriptor.cpp

@@ -756,7 +756,7 @@ int BinaryDescriptor::OctaveKeyLines( cv::Mat& image, ScaleLines &keyLines )
 
   /* some variables' declarations */
   float rho1, rho2, tempValue;
-  float direction, near, length;
+  float direction, diffNear, length;
   unsigned int octaveID, lineIDInOctave;
 
   /*more than one octave image, organize lines in scale space.
@@ -784,8 +784,8 @@ int BinaryDescriptor::OctaveKeyLines( cv::Mat& image, ScaleLines &keyLines )
         /*nearThreshold depends on the distance of the image coordinate origin to current line.
          *so nearThreshold = rho1 * nearThresholdRatio, where nearThresholdRatio = 1-cos(10*pi/180) = 0.0152*/
         tempValue = (float) ( rho1 * 0.0152 );
-        float nearThreshold = ( tempValue > 6 ) ? ( tempValue ) : 6;
-        nearThreshold = ( nearThreshold < 12 ) ? nearThreshold : 12;
+        float diffNearThreshold = ( tempValue > 6 ) ? ( tempValue ) : 6;
+        diffNearThreshold = ( diffNearThreshold < 12 ) ? diffNearThreshold : 12;
 
         /* compute scaled lenght of current line */
         dx = fabs( edLineVec_[octaveCount]->lineEndpoints_[lineCurId][0] - edLineVec_[octaveCount]->lineEndpoints_[lineCurId][2] );  //x1-x2
@@ -831,10 +831,10 @@ int BinaryDescriptor::OctaveKeyLines( cv::Mat& image, ScaleLines &keyLines )
           /* get known term from equation to be compared */
           rho2 = (float) ( scale[octaveID] * fabs( edLineVec_[octaveID]->lineEquations_[lineIDInOctave][2] ) );
           /* compute difference between known ters */
-          near = fabs( rho1 - rho2 );
+          diffNear = fabs( rho1 - rho2 );
 
           /* two lines are not close in the image */
-          if( near > nearThreshold )
+          if( diffNear > diffNearThreshold )
           {
             continue;
           }