High-pass 2d

high pass filter on 2d image More...

IPSDKIPLFILTERING_API image::ImagePtr	ipsdk::imaproc::filter::highPass2dImg (const image::ImageConstPtr &pInImg, const ipUInt32 inHalfKnlSize)
	wrapper function for high pass filter on 2d image More...
IPSDKIPLFILTERING_API void	ipsdk::imaproc::filter::highPass2dImg (const image::ImageConstPtr &pInImg, const ipUInt32 inHalfKnlSize, const image::ImagePtr &pOutImg)
	wrapper function for high pass filter on 2d image More...

Detailed Description

high pass filter on 2d image

High-pass filters keep high frequencies of the input image and reduce low frequencies. They are usually used to make the image appear sharper. This current implementation of high-pass filter is equivalent to a 2d convolution, using a square kernel of given half size ( ), whose all elements equal to -1, except the central element, whose value equals to .

A mirror policy is used to apply filter to borders. Input and output images must have same size (see Border policy for more details).

Here is an example of a high-pass filter applied to an 8-bits grey levels input image (with ) :

Attributes description

Attribute description for algorithm :

Name	ToolTip	Default Initializer
ipsdk::imaproc::attr::InImg	[Input] image for processing operation	X
ipsdk::imaproc::attr::InHalfKnlSize	[Input] half kernel size (square or cubic kernel)	X
ipsdk::imaproc::attr::OutImg	[Output] image for processing operation	promoteUnary (_pOutImg, _pInImg, ipsdk::imaproc::ePromoteUnaryType::ePUT_UpperSigned)

Global Rule description

Global rule description for algorithm :
ipsdk::imaproc::matchSize (_pInImg,_pOutImg)

Example of Python code :

Example imports

import PyIPSDK
import PyIPSDK.IPSDKIPLFiltering as filter

Code Example

    # opening of input images
    inImg = PyIPSDK.loadTiffImageFile(inputImgPath)
    
    # high pass filter 2d computation
    outImg = filter.highPass2dImg(inImg, 5)

Example of C++ code :

Example informations

Associated library

IPSDKIPLFiltering

Header file

#include <IPSDKIPL/IPSDKIPLFiltering/Processor/HighPass2dImg/HighPass2dImg.h>

Code Example

        // definition of a custom output geometry
        ImageGeometryPtr pOutImageGeometry =
            geometry2d(outImageBufferType,
                       pInImg->getSizeX(),
                       pInImg->getSizeY());

        // creation of output image
        boost::shared_ptr<MemoryImage> pOutImg = boost::make_shared<MemoryImage>();
        pOutImg->init(*pOutImageGeometry);

        // compute high pass filter on input image
        highPass2dImg(pInImg, inHalfKnlSize, pOutImg);

See also

HighPass2dImgLvl1

HighPass2dImgLvl2

HighPass2dImgLvl3

Function Documentation

highPass2dImg() [1/2]

IPSDKIPLFILTERING_API image::ImagePtr ipsdk::imaproc::filter::highPass2dImg	(	const image::ImageConstPtr &	pInImg,
		const ipUInt32	inHalfKnlSize
	)

wrapper function for high pass filter on 2d image

Exceptions

ipsdk::processor::IPSDKBaseProcessingException

on failure

highPass2dImg() [2/2]

IPSDKIPLFILTERING_API void ipsdk::imaproc::filter::highPass2dImg	(	const image::ImageConstPtr &	pInImg,
		const ipUInt32	inHalfKnlSize,
		const image::ImagePtr &	pOutImg
	)

wrapper function for high pass filter on 2d image

Exceptions

ipsdk::processor::IPSDKBaseProcessingException

on failure