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cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb (Operator)


cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb — Convert a single-channel color filter array image into an RGB image.


cfa_to_rgb(CFAImage : RGBImage : CFAType, Interpolation : )

Herror cfa_to_rgb(const Hobject CFAImage, Hobject* RGBImage, const char* CFAType, const char* Interpolation)

Herror T_cfa_to_rgb(const Hobject CFAImage, Hobject* RGBImage, const Htuple CFAType, const Htuple Interpolation)

Herror cfa_to_rgb(Hobject CFAImage, Hobject* RGBImage, const HTuple& CFAType, const HTuple& Interpolation)

HImage HImage::CfaToRgb(const HTuple& CFAType, const HTuple& Interpolation) const

HImageArray HImageArray::CfaToRgb(const HTuple& CFAType, const HTuple& Interpolation) const

void CfaToRgb(const HObject& CFAImage, HObject* RGBImage, const HTuple& CFAType, const HTuple& Interpolation)

HImage HImage::CfaToRgb(const HString& CFAType, const HString& Interpolation) const

HImage HImage::CfaToRgb(const char* CFAType, const char* Interpolation) const

void HOperatorSetX.CfaToRgb(
[in] IHUntypedObjectX* CFAImage, [out] IHUntypedObjectX*RGBImage, [in] VARIANT CFAType, [in] VARIANT Interpolation)

IHImageX* HImageX.CfaToRgb(
[in] BSTR CFAType, [in] BSTR Interpolation)

static void HOperatorSet.CfaToRgb(HObject CFAImage, out HObject RGBImage, HTuple CFAType, HTuple interpolation)

HImage HImage.CfaToRgb(string CFAType, string interpolation)


cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb converts a single-channel color filter array image CFAImageCFAImageCFAImageCFAImageCFAImageCFAImage into an RGB image RGBImageRGBImageRGBImageRGBImageRGBImageRGBImage. Color filter array images are typically generated by single-chip CCD cameras. The conversion from color filter array image to RGB image is typically done on the camera itself or is performed by the device driver of the frame grabber that is used to grab the image. In some cases, however, the device driver simply passes the color filter array image through unchanged. In this case, the corresponding HALCON frame grabber interface typically converts the image into an RGB image. Hence, the operator cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb is normally used if the images are not being grabbed using the HALCON frame grabber interface (grab_imagegrab_imageGrabImagegrab_imageGrabImageGrabImage or grab_image_asyncgrab_image_asyncGrabImageAsyncgrab_image_asyncGrabImageAsyncGrabImageAsync), but are grabbed using function calls from the frame grabber SDK, and are passed to HALCON using gen_image1gen_image1GenImage1gen_image1GenImage1GenImage1 or gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern.

In single-chip CCD cameras, a color filter array in front of the sensor provides (subsampled) color information. The most frequently used filter is the so called Bayer filter. The color filter array has the following layout in this case:

     | G | B | G | B | G | B | ...
     | R | G | R | G | R | G | ...
     | G | B | G | B | G | B | ...
     | R | G | R | G | R | G | ...
     | . | . | . | . | . | . | .
     | . | . | . | . | . | . |  .
     | . | . | . | . | . | . |   .

Each gray value of the input image CFAImageCFAImageCFAImageCFAImageCFAImageCFAImage corresponds to the brightness of the pixel behind the corresponding color filter. Hence, in the above layout, the pixel (0, 0) corresponds to a green color value, while the pixel (0, 1) corresponds to a blue color value. The layout of the Bayer filter is completely determined by the first two elements of the first row of the image, and can be chosen with the parameter CFATypeCFATypeCFATypeCFATypeCFATypeCFAType. In particular, this enables the correct conversion of color filter array images that have been cropped out of a larger image (e.g., using crop_partcrop_partCropPartcrop_partCropPartCropPart or crop_rectangle1crop_rectangle1CropRectangle1crop_rectangle1CropRectangle1CropRectangle1).

The algorithm that is used to interpolate the RGB values is determined by the parameter InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation. For InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation = 'bilinear'"bilinear""bilinear""bilinear""bilinear""bilinear", a bilinear interpolation is performed. For InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation = 'bilinear_dir'"bilinear_dir""bilinear_dir""bilinear_dir""bilinear_dir""bilinear_dir", a modified version of the bilinear interpolation is performed that may lead to fewer “zipper-like” artifacts, especially at horizontal or vertical edges in the image.

If 'mmx_enable'"mmx_enable""mmx_enable""mmx_enable""mmx_enable""mmx_enable" is set to 'true'"true""true""true""true""true" (and the SIMD instruction set is available), the internal calculations for byte images are performed using SIMD technology.

cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb can be executed on OpenCL devices. The width of the input image should be a multiple of four for byte images, or two for uint2 images, as the operation will be much slower otherwise.



CFAImageCFAImageCFAImageCFAImageCFAImageCFAImage (input_object)  singlechannelimage(-array) objectHImageHImageHImageHImageXHobject (byte* / uint2*) *allowed for compute devices

Input image.

RGBImageRGBImageRGBImageRGBImageRGBImageRGBImage (output_object)  multichannel-image(-array) objectHImageHImageHImageHImageXHobject * (byte / uint2)

Output image.

CFATypeCFATypeCFATypeCFATypeCFATypeCFAType (input_control)  string HTupleHTupleHTupleVARIANTHtuple (string) (string) (HString) (char*) (BSTR) (char*)

Color filter array type.

Default value: 'bayer_gb' "bayer_gb" "bayer_gb" "bayer_gb" "bayer_gb" "bayer_gb"

List of values: 'bayer_bg'"bayer_bg""bayer_bg""bayer_bg""bayer_bg""bayer_bg", 'bayer_gb'"bayer_gb""bayer_gb""bayer_gb""bayer_gb""bayer_gb", 'bayer_gr'"bayer_gr""bayer_gr""bayer_gr""bayer_gr""bayer_gr", 'bayer_rg'"bayer_rg""bayer_rg""bayer_rg""bayer_rg""bayer_rg"

InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation (input_control)  string HTupleHTupleHTupleVARIANTHtuple (string) (string) (HString) (char*) (BSTR) (char*)

Interpolation type.

Default value: 'bilinear' "bilinear" "bilinear" "bilinear" "bilinear" "bilinear"

List of values: 'bilinear'"bilinear""bilinear""bilinear""bilinear""bilinear", 'bilinear_dir'"bilinear_dir""bilinear_dir""bilinear_dir""bilinear_dir""bilinear_dir"


cfa_to_rgbcfa_to_rgbCfaToRgbcfa_to_rgbCfaToRgbCfaToRgb returns 2 (H_MSG_TRUE) if all parameters are correct. If the input is empty the behavior can be set via set_system(::'no_object_result', <Result>:)set_system("no_object_result", <Result>)SetSystem("no_object_result", <Result>)set_system("no_object_result", <Result>)SetSystem("no_object_result", <Result>)SetSystem("no_object_result", <Result>). If necessary, an exception is raised.

Possible Predecessors

gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern, gen_image1gen_image1GenImage1gen_image1GenImage1GenImage1, grab_imagegrab_imageGrabImagegrab_imageGrabImageGrabImage

Possible Successors


See also




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