Horus C++ Reference

Equivalent to : img.genConv2dSep( gaussx, gaussy, "mul", "addAssign", HxImageRep::ARITH_PREC)

where gaussx and gaussy are the 1d double-precision Gaussian kernel based on sigma, orderDeriv{x,y}, and accuracy.

Notice that the kernel is applied to every dimension of the image separately and that the result image has a double-precision pixel type.

00018 {
00019     HxString fname("HxGaussDerivative2d");
00020 
00021     if (img.isNull())
00022     {
00023         HxGlobalError::instance()->reportError(fname, img.name(), "null image", HxGlobalError::HX_GE_INVALID);
00024         return HxImageRep();
00025     }
00026 
00027     if (sigma <= 0.0)
00028     {
00029         HxGlobalError::instance()->reportError(fname, img.name(), "invalid value of sigma", HxGlobalError::HX_GE_INVALID);
00030         return HxImageRep();
00031     }
00032     if (orderDerivx < 0)
00033     {
00034         HxGlobalError::instance()->reportError(fname, img.name(), "invalid value of OrderDerivx", HxGlobalError::HX_GE_INVALID);
00035         return HxImageRep();
00036     }
00037     if (orderDerivy < 0)
00038     {
00039         HxGlobalError::instance()->reportError(fname, img.name(), "invalid value of OrderDerivy", HxGlobalError::HX_GE_INVALID);
00040         return HxImageRep();
00041     }
00042 
00043     if (truncation < 0.0)
00044     {
00045         HxGlobalError::instance()->reportError(fname, img.name(), "invalid value of truncation", HxGlobalError::HX_GE_INVALID);
00046         return HxImageRep();
00047     }
00048 
00049     if (img.dimensionality() != 2)
00050     {
00051         HxGlobalError::instance()->reportError(fname, img.name(), "function only valid for 2D images", HxGlobalError::HX_GE_INVALID);
00052         return HxImageRep();
00053     }
00054 
00055     HxImageRep gaussx, gaussy;
00056 
00057     gaussx = HxMakeGaussian1d(sigma, orderDerivx, truncation,
00058         img.dimensionSize(1));
00059     gaussy = HxMakeGaussian1d(sigma, orderDerivy, truncation,
00060         img.dimensionSize(2));
00061 
00062     return img.genConv2dSep(
00063         gaussx, gaussy, "mul", "addAssign", HxImageRep::ARITH_PREC);
00064 }

Functions
HxImageRep L_HXIMAGEREP	HxGaussDerivative2d (HxImageRep img, double sigma, int orderDerivx, int orderDerivy, double accuracy=3.0)
	Convolution Gaussian. More...

HxGaussDerivative2d.h File Reference

Functions

Detailed Description

Function Documentation