Intel® Integrated Performance Primitives Developer Reference

Developer Reference

  • 2021
  • 03/26/2021
  • Public Content
Contents

LUT

MODIFIED API.
Maps an image by applying intensity transformation.

Syntax

Case 1: Not-in-place operation on one-channel integer data
IppStatus ippiLUT_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C1R
16u_C1R
16s_C1R
Case 2: Not-in-place operation on multi-channel integer data
IppStatus ippiLUT_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C3R
16u_C3R
16s_C3R
8u_AC4R
16u_AC4R
16s_AC4R
IppStatus ippiLUT_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C4R
16u_C4R
16s_C4R
Case 3: Not-in-place operation on one-channel floating-point data
IppStatus ippiLUT_32f_C1R(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Case 4: Not-in-place operation on multi-channel floating-point data
IppStatus ippiLUT_<mod>(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
32f_C3R
32f_AC4R
IppStatus ippiLUT_32f_C4R(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Case 5: In-place operation on one-channel integer data
IppStatus ippiLUT_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C1IR
16u_C1IR
16s_C1IR
Case 6: In-place operation on multi-channel integer data
IppStatus ippiLUT_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C3IR
16u_C3IR
16s_C3IR
8u_AC4IR
16u_AC4IR
16s_AC4IR
IppStatus ippiLUT_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
8u_C4IR
16u_C4IR
16s_C4IR
Case 7: In-place operation on one-channel floating-point data
IppStatus ippiLUT_32f_C1IR(Ipp32f*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Case 8: In-place operation on multi-channel floating-point data
IppStatus ippiLUT_<mod>(Ipp32f*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Supported values for
mod
:
32f_C3IR
32f_AC4IR
IppStatus ippiLUT_32f_C4IR(Ipp32f*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize
, IppiLUT_Spec*
pSpec
);
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
Parameters
pSrc
Pointer to the source image ROI.
srcStep
Distance, in bytes, between the starting points of consecutive lines in the source image.
pDst
Pointer to the destination image ROI.
dstStep
Distance, in bytes, between the starting points of consecutive lines in the destination image.
pSrcDst
Pointer to the source and destination mage ROI for the in-place operation.
srcDstStep
Distance, in bytes, between the starting points of consecutive lines in the source and destination image for the in-place operation.
roiSize
Size of the source ROI, in pixels.
pSpec
Pointer to the LUT specification structure.
Description
The API of this function has been modified in Intel IPP 9.0 release.
This function operates with ROI (see Regions of Interest in Intel IPP).
Before using this function, you need to compute the size of the specification structure using the LUT_GetSize function and initialize the structure using LUT_Init.
This function performs intensity transformation of the source image
pSrc
 using the lookup table (LUT) specified by the arrays
pLevels
,
pValues
, and
interpolation
 type specified in the LUT_Init function when
pSpec
 is initialized.
The figure below shows particular curves that are used in all the
ippiLUT
 function flavors for mapping. The level values are 0, 64, 128, 192, 256; the intensity values are 20, 60, 160, 180, 230.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error when any of the specified pointers is
NULL
.
ippStsSizeErr
Indicates an error when
roiSize
 has a field with a value less than 1.
ippStsStepErr
Indicates an error when
srcStep
,
dstStep
, or
srcDstStep
 has a zero or negative value.
ippStsBadArgErr
Indicates an error when
pSpec
 initialization is incorrect.

Example

The code example below demonstrates how to use LUT_GetSize, LUT_Init, and
ippiLUT
 functions.
#include "ippcore.h"
#include "ippi.h"
#include <iostream>
#include <iomanip>

void func_LUTLinear()
{
    IppStatus status;
    Ipp32f pSrc[8 * 8];
    int srcStep = 8 * sizeof(Ipp32f);
    IppiSize roiSize = { 8, 8 };

    Ipp32f pDst[8 * 8];
    int dstStep = 8 * sizeof(Ipp32f);
    Ipp32f pLevels[5] = { 0.0, 0.128, 0.256, 0.512, 1.0 };
    const Ipp32f* ppLevels[1] = { pLevels };
    Ipp32f pValues[5] = { 0.2, 0.4, 0.6, 0.8, 1.0 };
    const Ipp32f* ppValues[1] = { pValues };
    int nLevels[1] = { 5 };
    int specSize;
    IppiLUT_Spec* pSpec;

    status = ippiImageJaehne_32f_C1R(pSrc, srcStep, roiSize);

    std::cout << "pSrc:\n";
    for (int row = 0; row < roiSize.height; row++) {
        for (int col = 0; col < roiSize.width; col++) {
            std::cout << std::fixed << std::setprecision(2) <<pSrc[roiSize.width * row + col] << "\t";
        }
        std::cout << "\n";
    }


    ippiLUT_GetSize(ippLinear, ipp32f, ippC1, roiSize, nLevels, &specSize);

    pSpec = (IppiLUT_Spec*)ippMalloc(specSize);

    ippiLUT_Init_32f(ippLinear, ippC1, roiSize, ppValues, ppLevels, nLevels, pSpec);
    status = ippiLUT_32f_C1R(pSrc, srcStep, pDst, dstStep, roiSize, pSpec);

    std::cout << "pDst:\n";
    for (int row = 0; row < roiSize.height; row++) {
        for (int col = 0; col < roiSize.width; col++) {
            std::cout << pDst[roiSize.width * row + col] << "\t";
        }
        std::cout << "\n";
    }

    ippFree(pSpec);
}
Result:
pSrc:
0.00 0.26 0.65 0.82 0.82 0.65 0.26 0.00
0.26 0.82 1.00 0.98 0.98 1.00 0.82 0.26
0.65 1.00 0.89 0.74 0.74 0.89 1.00 0.65
0.82 0.98 0.74 0.55 0.55 0.74 0.98 0.82
0.82 0.98 0.74 0.55 0.55 0.74 0.98 0.82
0.65 1.00 0.89 0.74 0.74 0.89 1.00 0.65
0.26 0.82 1.00 0.98 0.98 1.00 0.82 0.26
0.00 0.26 0.65 0.82 0.82 0.65 0.26 0.00

pDst:
0.20 0.61 0.85 0.93 0.93 0.85 0.61 0.20
0.61 0.93 1.00 0.99 0.99 1.00 0.93 0.61
0.85 1.00 0.95 0.89 0.89 0.95 1.00 0.85
0.93 0.99 0.89 0.82 0.82 0.89 0.99 0.93
0.93 0.99 0.89 0.82 0.82 0.89 0.99 0.93
0.85 1.00 0.95 0.89 0.89 0.95 1.00 0.85
0.61 0.93 1.00 0.99 0.99 1.00 0.93 0.61
0.20 0.61 0.85 0.93 0.93 0.85 0.61 0.20

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.