Horus C++ Reference

Computes the Canny edge map of a scalar image, performs non-maxima suppression, and tresholds the norm of the resulting vector field at the given level (alternative implementation).

00014 {
00015     HxString fname("HxCannyThresholdAlt");
00016 
00017     if (img.isNull())
00018     {
00019         HxGlobalError::instance()->reportError(fname, img.name(), "null image", HxGlobalError::HX_GE_INVALID);
00020         return HxImageRep();
00021     }
00022 
00023     if (sigma <= 0.0)
00024     {
00025         HxGlobalError::instance()->reportError(fname, img.name(), "invalid value of sigma", HxGlobalError::HX_GE_INVALID);
00026         return HxImageRep();
00027     }
00028 
00029     if (img.signature().imageDimensionality() != 2)
00030     {
00031         HxGlobalError::instance()->reportError(fname, "only defined for 2D images", HxGlobalError::HX_GE_INVALID);
00032         return HxImageRep();
00033     }
00034     if (img.signature().pixelDimensionality() != 1)
00035     {
00036         HxGlobalError::instance()->reportError(fname, "only defined for scalar pixel types", HxGlobalError::HX_GE_INVALID);
00037         return HxImageRep();
00038     }
00039 
00040     HxImageRep edges = HxCannyEdgeMap(img, sigma);
00041     HxTagList tags;
00042     HxAddTag(tags, "level", HxValue(level));
00043     return edges.neighbourhoodOp("isMaxGradDir", tags);
00044 }

Functions
HxImageRep L_HXIMAGEREP	HxCannyThresholdAlt (HxImageRep img, double sigma, double level)
	Computes the Canny edge map of a scalar image, performs non-maxima suppression, and tresholds the norm of the resulting vector field at the given level (alternative implementation). More...

HxCannyThresholdAlt.h File Reference

Functions

Detailed Description

Function Documentation