fixed remap with transparent border (ticket #582)

modules/core/include/opencv2/core/types_c.h

@@ -513,6 +513,7 @@ IplConvKernelFP;
 
 /* extra border mode */
 #define IPL_BORDER_REFLECT_101    4
+#define IPL_BORDER_TRANSPARENT    5
 
 #define IPL_IMAGE_MAGIC_VAL  ((int)sizeof(IplImage))
 #define CV_TYPE_NAME_IMAGE "opencv-image"

modules/imgproc/include/opencv2/imgproc/imgproc.hpp

@@ -60,9 +60,10 @@ namespace cv
 
 //! various border interpolation methods
 enum { BORDER_REPLICATE=IPL_BORDER_REPLICATE, BORDER_CONSTANT=IPL_BORDER_CONSTANT,
-       BORDER_REFLECT=IPL_BORDER_REFLECT, BORDER_REFLECT_101=IPL_BORDER_REFLECT_101,
-       BORDER_REFLECT101=BORDER_REFLECT_101, BORDER_WRAP=IPL_BORDER_WRAP,
-       BORDER_TRANSPARENT, BORDER_DEFAULT=BORDER_REFLECT_101, BORDER_ISOLATED=16 };
+       BORDER_REFLECT=IPL_BORDER_REFLECT, BORDER_WRAP=IPL_BORDER_WRAP, 
+ 	   BORDER_REFLECT_101=IPL_BORDER_REFLECT_101, BORDER_REFLECT101=BORDER_REFLECT_101,
+       BORDER_TRANSPARENT=IPL_BORDER_TRANSPARENT,
+       BORDER_DEFAULT=BORDER_REFLECT_101, BORDER_ISOLATED=16 };
 
 //! 1D interpolation function: returns coordinate of the "donor" pixel for the specified location p. 
 CV_EXPORTS_W int borderInterpolate( int p, int len, int borderType );

modules/imgproc/src/imgwarp.cpp

@@ -2175,9 +2175,7 @@ static void remapBicubic( const Mat& _src, Mat& _dst, const Mat& _xy,
             else
             {
                 int x[4], y[4];
-                if( borderType == BORDER_TRANSPARENT &&
-                    ((unsigned)(sx+1) >= (unsigned)ssize.width ||
-                    (unsigned)(sy+1) >= (unsigned)ssize.height) )
+                if( borderType == BORDER_TRANSPARENT )
                     continue;
 
                 if( borderType == BORDER_CONSTANT &&
@@ -2277,9 +2275,7 @@ static void remapLanczos4( const Mat& _src, Mat& _dst, const Mat& _xy,
             else
             {
                 int x[8], y[8];
-                if( borderType == BORDER_TRANSPARENT &&
-                    ((unsigned)(sx+3) >= (unsigned)ssize.width ||
-                    (unsigned)(sy+3) >= (unsigned)ssize.height) )
+                if( borderType == BORDER_TRANSPARENT )
                     continue;
 
                 if( borderType == BORDER_CONSTANT &&