Developer Reference

  • 2020
  • 10/21/2020
  • Public Content
Contents

ToneMapLinear, ToneMapMean

Maps an HDRI image to the LDRI image.

Syntax

IppStatus ippiToneMapLinear_32f8u_C1R(const Ipp32f*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
IppStatus ippiToneMapMean_32f8u_C1R(const Ipp32f*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
Include Files
ippcc.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
,
ippi.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
,
ippi.lib
Parameters
pSrc
Pointer to the ROI in the HDRI source image.
srcStep
Distance in bytes between starts of consecutive lines in the source image.
pDst
Pointer to the ROI in the LDRI destination image.
dstStep
Distance in bytes between starts of consecutive lines in the destination image.
roiSize
Size of the source and destination ROI in pixels.
Description
They both operate with ROI (see Regions of Interest in Intel IPP).
These functions convert the source high dynamic range image (HDRI)
pSrc
into low dynamic range image (LDRI)
pDst
. Pixel values of the source image must be positive.
The function
ippiToneMapLinear
implements the Linear Scale-Factor method converting each source pixel
pSrc[i]
in accordance with the formula:
pSrc
[i] =
pSrc
[i]/
Lmax
,
Lmax
= max{
pSrc
[i]}
.
The function
ippiToneMapMean
implements the Mean Value method converting each source pixel
pSrc[i]
in accordance with the formula:
pSrc
[i] = 0.5*
pSrc
[i]/
Lave
,
Lave
= average{
pSrc
[i]}
.
If the value of
Lmax
or
Lave
is less than 0, then the function does not perform the operation and returns the warning message.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error condition if
pSrc
or
pDst
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.
ippStsNoOperation
Indicates a warning if the values of
Lmax
or
Lave
are less than 0.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804