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Image signatures

The signature of an image gives a description of the characteristics of an image type (a class). Part of the description contains runtime information and is universally accessible through the base class HxImageSignature. The other part contains compile time information and is accessible only in specializations of HxImageSignature.

The universally accessible part is obtained by members of HxImageSignature:

• HxImageSignature::imageDimensionality : The dimensionality of an image, currently 1, 2, or 3.
• HxImageSignature::pixelDimensionality : The dimensionality of the pixel values in the image, currently 1 (scalar value), 2 (vector of 2 scalars), or 3 (vector of 3 scalars).
• HxImageSignature::pixelType : The type of the pixel values: INT, REAL, or COMPLEX.
• HxImageSignature::pixelPrecision : The number of bits used in the representation of a pixel value, currently 8, 16, 32, or 64.

Specializations of HxImageSignature provide additional information on the static types needed in the implementation of image processing operations by means of typedefs:

• PixelType The type of the actual pixel values stored in the image (see Pixel value representation).
• ArithType The type used in the evaluation of arithmetic operations on pixel values (see Arithmetic data types).
• ArithTypeDouble The type used in the evaluation of arithmetic operations on pixels in combination with other values that are represented as reals, e.g. in template operations with a kernel specified in doubles. May be the same as ArithType.
• DataPtrType The type of a data pointer to this image type (see Image data pointers).
• Allocator The type of a pixel allocator for this image type.
• ProjectDomainImageSigType The type (signature) of an image that is the result of the domain projection operation.
• ArithImageSigType The signature with the same image dimensionality but based on ArithType instead of PixelType.
• ArithImageSigTypeDouble The signature with the same image dimensionality but based on ArithTypeDouble.

The list of signatures

2D images with pixels represented by a scalar value

HxImageSig2dByte, HxImageSig2dDouble, HxImageSig2dFloat, HxImageSig2dInt, HxImageSig2dShort.

2D images with pixels represented by a complex number

HxImageSig2dComplex.

2D images with pixels represented by a vector of 2 scalars

HxImageSig2dVec2Byte, HxImageSig2dVec2Double, HxImageSig2dVec2Float, HxImageSig2dVec2Int, HxImageSig2dVec2Short.

2D images with pixels represented by a vector of 3 scalars

HxImageSig2dVec3Byte, HxImageSig2dVec3Double, HxImageSig2dVec3Float, HxImageSig2dVec3Int, HxImageSig2dVec3Short.

3D images with pixels represented by a scalar value

HxImageSig3dByte, HxImageSig3dDouble, HxImageSig3dFloat, HxImageSig3dInt, HxImageSig3dShort.

An overview of the currently available image types and the associated PixelType, ArithType, and ArithTypeDouble.

ImageType	PixelType	ArithType	ArithTypeDouble
HxImage2dByte	HxByte	HxScalarInt	HxScalarDouble
HxImage2dShort	short	HxScalarInt	HxScalarDouble
HxImage2dInt	int	HxScalarInt	HxScalarDouble
HxImage2dFloat	float	HxScalarDouble	HxScalarDouble
HxImage2dDouble	double	HxScalarDouble	HxScalarDouble
HxImage2dComplex	HxComplex	HxComplex	HxComplex
HxImage2dVec2Byte	HxVec2Byte	HxVec2Int	HxVec2Double
HxImage2dVec2Short	HxVec2Short	HxVec2Int	HxVec2Double
HxImage2dVec2Int	HxVec2Int	HxVec2Int	HxVec2Double
HxImage2dVec2Float	HxVec2Float	HxVec2Double	HxVec2Double
HxImage2dVec2Double	HxVec2Double	HxVec2Double	HxVec2Double
HxImage2dVec3Byte	HxVec3Byte	HxVec3Int	HxVec3Double
HxImage2dVec3Short	HxVec3Short	HxVec3Int	HxVec3Double
HxImage2dVec3Int	HxVec3Int	HxVec3Int	HxVec3Double
HxImage2dVec3Float	HxVec3Float	HxVec3Double	HxVec3Double
HxImage2dVec3Double	HxVec3Double	HxVec3Double	HxVec3Double
HxImage3dByte	HxByte	HxScalarInt	HxScalarDouble
HxImage3dShort	short	HxScalarInt	HxScalarDouble
HxImage3dInt	int	HxScalarInt	HxScalarDouble
HxImage3dFloat	float	HxScalarDouble	HxScalarDouble
HxImage3dDouble	double	HxScalarDouble	HxScalarDouble

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