NVIDIA Performance Primitives (NPP)  Version 10.0
Functions

Grayscale Color Filter Array to RGB Color Debayer conversion. More...

Functions

NppStatus nppiCFAToRGB_8u_C1C3R (const Npp8u *pSrc, int nSrcStep, NppiSize oSrcSize, NppiRect oSrcROI, Npp8u *pDst, int nDstStep, NppiBayerGridPosition eGrid, NppiInterpolationMode eInterpolation)
 1 channel 8-bit unsigned packed CFA grayscale Bayer pattern to 3 channel 8-bit unsigned packed RGB conversion. More...
 
NppStatus nppiCFAToRGBA_8u_C1AC4R (const Npp8u *pSrc, int nSrcStep, NppiSize oSrcSize, NppiRect oSrcROI, Npp8u *pDst, int nDstStep, NppiBayerGridPosition eGrid, NppiInterpolationMode eInterpolation, Npp8u nAlpha)
 1 channel 8-bit unsigned packed CFA grayscale Bayer pattern to 4 channel 8-bit unsigned packed RGB conversion with alpha. More...
 
NppStatus nppiCFAToRGB_16u_C1C3R (const Npp16u *pSrc, int nSrcStep, NppiSize oSrcSize, NppiRect oSrcROI, Npp16u *pDst, int nDstStep, NppiBayerGridPosition eGrid, NppiInterpolationMode eInterpolation)
 1 channel 16-bit unsigned packed CFA grayscale Bayer pattern to 3 channel 16-bit unsigned packed RGB conversion. More...
 
NppStatus nppiCFAToRGBA_16u_C1AC4R (const Npp16u *pSrc, int nSrcStep, NppiSize oSrcSize, NppiRect oSrcROI, Npp16u *pDst, int nDstStep, NppiBayerGridPosition eGrid, NppiInterpolationMode eInterpolation, Npp16u nAlpha)
 1 channel 16-bit unsigned packed CFA grayscale Bayer pattern to 4 channel 16-bit unsigned packed RGB conversion with alpha. More...
 

Detailed Description

Grayscale Color Filter Array to RGB Color Debayer conversion.

Generates one RGB color pixel for every grayscale source pixel. Source and destination images must have even width and height. Missing pixel colors are generated using bilinear interpolation with chroma correlation of generated green values (eInterpolation MUST be set to 0). eGrid allows the user to specify the Bayer grid registration position at source image location oSrcROI.x, oSrcROI.y relative to pSrc. Possible registration positions are:

*
* B G R G G B G R
* G R G B R G B G
*
*

If it becomes necessary to access source pixels outside source image then the source image borders are mirrored.

Here is how the algorithm works. R, G, and B base pixels from the source image are used unmodified. To generate R values for those G pixels, the average of R(x - 1, y) and R(x + 1, y) or R(x, y - 1) and R(x, y + 1) is used depending on whether the left and right or top and bottom pixels are R base pixels. To generate B values for those G pixels, the same algorithm is used using nearest B values. For an R base pixel, if there are no B values in the upper, lower, left, or right adjacent pixels then B is the average of B values in the 4 diagonal (G base) pixels. The same algorithm is used using R values to generate the R value of a B base pixel. Chroma correlation is applied to generated G values only, for a B base pixel G(x - 1, y) and G(x + 1, y) are averaged or G(x, y - 1) and G(x, y + 1) are averaged depending on whether the absolute difference between B(x, y) and the average of B(x - 2, y) and B(x + 2, y) is smaller than the absolute difference between B(x, y) and the average of B(x, y - 2) and B(x, y + 2). For an R base pixel the same algorithm is used testing against the surrounding R values at those offsets. If the horizontal and vertical differences are the same at one of those pixels then the average of the four left, right, upper and lower G values is used instead.

Function Documentation

NppStatus nppiCFAToRGB_16u_C1C3R ( const Npp16u pSrc,
int  nSrcStep,
NppiSize  oSrcSize,
NppiRect  oSrcROI,
Npp16u pDst,
int  nDstStep,
NppiBayerGridPosition  eGrid,
NppiInterpolationMode  eInterpolation 
)

1 channel 16-bit unsigned packed CFA grayscale Bayer pattern to 3 channel 16-bit unsigned packed RGB conversion.

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
oSrcSizefull source image width and height relative to pSrc.
oSrcROIrectangle specifying starting source image pixel x and y location relative to pSrc and ROI width and height.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
eGridenumeration value specifying bayer grid registration position at location oSrcROI.x, oSrcROI.y relative to pSrc.
eInterpolationMUST be NPPI_INTER_UNDEFINED
Returns
Image Data Related Error Codes, ROI Related Error Codes
NppStatus nppiCFAToRGB_8u_C1C3R ( const Npp8u pSrc,
int  nSrcStep,
NppiSize  oSrcSize,
NppiRect  oSrcROI,
Npp8u pDst,
int  nDstStep,
NppiBayerGridPosition  eGrid,
NppiInterpolationMode  eInterpolation 
)

1 channel 8-bit unsigned packed CFA grayscale Bayer pattern to 3 channel 8-bit unsigned packed RGB conversion.

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
oSrcSizefull source image width and height relative to pSrc.
oSrcROIrectangle specifying starting source image pixel x and y location relative to pSrc and ROI width and height.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
eGridenumeration value specifying bayer grid registration position at location oSrcROI.x, oSrcROI.y relative to pSrc.
eInterpolationMUST be NPPI_INTER_UNDEFINED
Returns
Image Data Related Error Codes, ROI Related Error Codes
NppStatus nppiCFAToRGBA_16u_C1AC4R ( const Npp16u pSrc,
int  nSrcStep,
NppiSize  oSrcSize,
NppiRect  oSrcROI,
Npp16u pDst,
int  nDstStep,
NppiBayerGridPosition  eGrid,
NppiInterpolationMode  eInterpolation,
Npp16u  nAlpha 
)

1 channel 16-bit unsigned packed CFA grayscale Bayer pattern to 4 channel 16-bit unsigned packed RGB conversion with alpha.

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
oSrcSizefull source image width and height relative to pSrc.
oSrcROIrectangle specifying starting source image pixel x and y location relative to pSrc and ROI width and height.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
eGridenumeration value specifying bayer grid registration position at location oSrcROI.x, oSrcROI.y relative to pSrc.
eInterpolationMUST be NPPI_INTER_UNDEFINED
nAlphaconstant alpha value to be written to each destination pixel
Returns
Image Data Related Error Codes, ROI Related Error Codes
NppStatus nppiCFAToRGBA_8u_C1AC4R ( const Npp8u pSrc,
int  nSrcStep,
NppiSize  oSrcSize,
NppiRect  oSrcROI,
Npp8u pDst,
int  nDstStep,
NppiBayerGridPosition  eGrid,
NppiInterpolationMode  eInterpolation,
Npp8u  nAlpha 
)

1 channel 8-bit unsigned packed CFA grayscale Bayer pattern to 4 channel 8-bit unsigned packed RGB conversion with alpha.

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
oSrcSizefull source image width and height relative to pSrc.
oSrcROIrectangle specifying starting source image pixel x and y location relative to pSrc and ROI width and height.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
eGridenumeration value specifying bayer grid registration position at location oSrcROI.x, oSrcROI.y relative to pSrc.
eInterpolationMUST be NPPI_INTER_UNDEFINED
nAlphaconstant alpha value to be written to each destination pixel
Returns
Image Data Related Error Codes, ROI Related Error Codes

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