Dilate3x3

Performs dilation of an image using a 3x3 mask.

Syntax

Case 1: Not-in-place operation

IppStatus ippiDilate3x3_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize);

Supported values for mod:

8u_C1R	16u_C1R	32f_C1R	64f_C1R
8u_C3R	16u_C3R	32f_C3R
8u_C4R	16u_C4R	32f_C4R
8u_AC4R	16u_AC4R	32f_AC4R

Case 2: In-place operation

IppStatus ippiDilate3x3_<mod>(Ipp<datatype>* pSrcDst, int srcDstStep, IppiSize roiSize);

Supported values for mod:

8u_C1IR	16u_C1IR	32f_C1IR
8u_C3IR	16u_C3IR	32f_C3IR
8u_C4IR	16u_C4IR	32f_C4IR
8u_AC4IR	16u_AC4IR	32f_AC4IR

Parameters

pSrc	Pointer to the source image ROI.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pDst	Pointer to the destination image ROI.
dstStep	Distance in bytes between starts of consecutive lines in the destination image.
pSrcDst	Pointer to the source and destination image ROIs for the in-place operation.
srcDstStep	Distance in bytes between starts of consecutive lines in the source and destination image buffer for the in-place operation.
roiSize	Size of the source and destination ROI in pixels.

Description

The function ippiDilate3x3 is declared in the ippi.h file. It operates with ROI (see Regions of Interest in Intel IPP).

This function performs dilation of a rectangular ROI area inside a one-, three-, or four-channel 2D image using a symmetric 3x3 mask.

Source and destination images can be of different sizes, but the ROI size is the same for both images. The output pixel is set to the maximum of the corresponding input pixel and its eight neighboring pixels.

Example “Dilation of a Dot” shows how to use the dilation function.

Return Values

ippStsNoErr	Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr	Indicates an error condition if pSrc, pDst, or pSrcDst is NULL.
ippStsSizeErr	Indicates an error condition if roiSize has a field with zero or negative value.
ippStsStepErr	Indicates an error condition if srcStep, dstStep or srcDstStep has a zero or negative value.

Dilation of a Dot

IppStatus dilate( void ) {
   Ipp8u x[7*5];
   IppiSize roi = {7,5};
   ippiSet_8u_C1R( 0, x, 7, roi );
   x[2*7+3] = 1;
   roi.width = roi.width - 2;
   roi.height = roi.height - 2;
   return ippiDilate3x3_8u_C1IR( x+7+1, 7, roi );
}

The destination image x contains:

  00 00 00 00 00 00 00
  00 00 01 01 01 00 00
  00 00 01 01 01 00 00
  00 00 01 01 01 00 00
  00 00 00 00 00 00 00