TFilterDef Struct Reference

Defines a linear convolution filter kernel (cXXYY) for use with FilterUser2x2, FilterUser3x3 and FilterUser5x5. More...

Data Fields
cvbval_t	c0000
	Element (2,2) of the filter mask. Required for FilterUser5x5, FilterUser3x3 and FilterUser2x2.
cvbval_t	c000B
	Element (2,3) of the filter mask. Required for FilterUser5x5, FilterUser3x3 and FilterUser2x2.
cvbval_t	c000T
	Element (2,1) of the filter mask. Required for FilterUser5x5 and FilterUser3x3.
cvbval_t	c00BB
	Element (2,4) of the filter mask. Required only for FilterUser5x5.
cvbval_t	c00TT
	Element (2,0) of the filter mask. Required only for FilterUser5x5.
cvbval_t	c0L00
	Element (1,2) of the filter mask. Required for FilterUser5x5 and FilterUser3x3.
cvbval_t	c0L0B
	Element (1,3) of the filter mask. Required for FilterUser5x5 and FilterUser3x3.
cvbval_t	c0L0T
	Element (1,1) of the filter mask. Required for FilterUser5x5 and FilterUser3x3.
cvbval_t	c0LBB
	Element (1,4) of the filter mask. Required only for FilterUser5x5.
cvbval_t	c0LTT
	Element (1,0) of the filter mask. Required only for FilterUser5x5.
cvbval_t	c0R00
	Element (3,2) of the filter mask. Required for FilterUser5x5, FilterUser3x3 and FilterUser2x2.
cvbval_t	c0R0B
	Element (3,3) of the filter mask. Required for FilterUser5x5, FilterUser3x3 and FilterUser2x2.
cvbval_t	c0R0T
	Element (3,1) of the filter mask. Required for FilterUser5x5 and FilterUser3x3.
cvbval_t	c0RBB
	Element (3,4) of the filter mask. Required only for FilterUser5x5.
cvbval_t	c0RTT
	Element (3,0) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cLL00
	Element (0,2) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cLL0B
	Element (0,3) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cLL0T
	Element (0,1) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cLLBB
	Element (0,4) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cLLTT
	Element (0,0) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cRR00
	Element (4,2) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cRR0B
	Element (4,3) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cRR0T
	Element (4,1) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cRRBB
	Element (4,4) of the filter mask. Required only for FilterUser5x5.
cvbval_t	cRRTT
	Element (4,0) of the filter mask. Required only for FilterUser5x5.
cvbval_t	Offst
	Offset to be added to the convolution result. Note that unlike the filter coefficients this value is expected to be a regular offset and not given in units of 1/1000.
OBJ	Reserved
	Reserved for internal use.

Related Symbols
(Note that these are not member symbols.)
cvbbool_t	FilterUser2x2 (IMG imgIn, const TFilterDef &filterDef, IMG &imgOut)
	Creates an image by applying a 2x2 linear convolution filter to the input image.
cvbbool_t	FilterUser3x3 (IMG imgIn, const TFilterDef &filterDef, IMG &imgOut)
	Creates an image by applying a 3x3 linear convolution filter to the input image.
cvbbool_t	FilterUser5x5 (IMG imgIn, const TFilterDef &filterDef, IMG &imgOut)
	Creates an image by applying a 5x5 linear convolution filter to the input image.

Detailed Description

Defines a linear convolution filter kernel (cXXYY) for use with FilterUser2x2, FilterUser3x3 and FilterUser5x5.

The struct members have been named using the following pattern: c<H><H><V><V> where

• c stands for 'coefficient'
• <H>stands for a horizontal offset (may be L, 0 or R)
• <V>stands for a horizontal offset (may be T, 0 or B) That way, the name of each of the struct members identifies the coefficient's position in a 5x5 filter mask; for example c0LTT is the coefficient in the top row of the 2nd column of the filter mask.

FilterUser5x5 requires a 5x5 filter mask and will use all the coefficients defined in a TFilterDef struct. FilterUser3x3 will only evaluate the elements

c0L0T	c000T	c0R0T
c0L00	c0000	c0R00
c0L0B	c000B	c0R0B

and FilterUser2x2 only evaluates

c0000	c0R00
c000B	c0R0B

Attention

The Minos filter functions expect the coefficients (but not the Offst member!) in units of 1/1000 so e.g., 1500 means a coefficient value of 1.5