Dilate Local Extrema 2dSee full documentation

image =	dilateLocalMaxima2dImg (inImg,inDilateFactor)
image =	dilateLocalMinima2dImg (inImg,inDilateFactor)

Detailed Description

algorithm allowing to extract dilated local extrema 2d from an image

This algorithm allows, given an input image InImg, a dilation factor InDilateFactor and a searched extrema type defined by InLocalExtremumType parameter, to compute a binary ouput image OutBinImg where all set pixels are part of a dilated local extrema.

Note

This algorithm is an extension of Local Extrema 2d algorithm allowing to dilate (and in some case merge) local extrema. Using this algorithm with a value of InDilateFactor set to 0 is equivalent of using Local Extrema 2d algorithm.

Dilation factor InDilateFactor is a grey scale factor (not a geometric factor) since local extrema are dilated with a distance based on grey scale difference.

Output image is computed has follow (local maxima case) :

where pixel with index is :

• connected to pixel with index in output image
• greater than or equal to all other values (local maxima) in the connected component associated to the pixel with index .

This is illustrated in case of a 1d signal :

Here is an example of a dilated local maxima extraction applied to an unsigned char input image with dilation factor equal to 0 :

Here is an example of a dilated local maxima extraction applied to an unsigned char input image with dilation factor equal to 5 (note merged maxima) :

Example of Python code :

Example imports

import PyIPSDK
import PyIPSDK.IPSDKIPLAdvancedMorphology as advmorpho

Code Example

    # opening of input image
    inImg = PyIPSDK.loadTiffImageFile(inputImgPath)
    
    # dilate local maxima 2d computation
    outImg = advmorpho.dilateLocalMaxima2dImg(inImg, 5)

Example of C++ code :

Example informations

Header file

#include <IPSDKIPL/IPSDKIPLAdvancedMorphology/Processor/DilateLocalExtrema2dImg/DilateLocalExtrema2dImg.h>

Code Example

    // opening of input image
    ImagePtr pInImg = loadTiffImageFile(inputImgPath);
    
    // mark local maxima in input image
    ImagePtr pOutMaxImg = dilateLocalMaxima2dImg(pInImg, 5);

    // mark local minima in input image
    ImagePtr pOutMinImg = dilateLocalMinima2dImg(pInImg, 5);