cfaImage = rawread(filename,VisibleImageOnly=visibleImageOnly)
specifies whether to read only the visible portion of the CFA or to read the entire CFA
including the frame.
Read only the visible Color Filter Array (CFA) image data from a file. By default, rawread returns only the visible portion of the CFA image.
cfa = rawread("colorCheckerTestImage.NEF");
Read the entire CFA image from a file, including the image frame. In a RAW image, the frame is typically used to calculate the black-level surrounding the visible image.
cfa = rawread("colorCheckerTestImage.NEF", "VisibleImageOnly", false);
Name of RAW file, specified as a string scalar or character vector. Specify
filename as a full path, containing the file name and extension,
or as a relative path from the current folder or from any folder on the MATLAB® path.
The rawread function does not support RAW file formats that
employ JPEG compression.
Data Types: char | string
Return only visible CFA image data, specified as a numeric or
logical 1 (true) or 0
(false). In a RAW image, the frame is typically used to calculate the black-level
surrounding the visible image. To read only the visible portion of the CFA, specify
true. To read the entire CFA, including the frame, specify
false. This table provides more detail for each option.
Value
Description
true
The dimensions of the cfaimage are
VisibleImageSize(1)-by-VisibleImageSize(2)-by-P,
where P is the number of
planes.
VisibleImageSize is a field in the
ImageSizeInfo structure returned by
rawinfo.
false
The dimensions of the cfaimage are
CFAImageSize(1)-by-CFAImageSize(2)-by-P,
where P is the number of
planes.
CFAImageSize is a field in the
structure returned by rawinfo.
CFA image, returned as an
m-by-n-by-p numeric
array.
By default, rawread returns only the visible portion of the CFA
image. In this case, the values of m and n
correspond to the first and second elements of the VisibleImageSize
field reported by rawinfo,
respectively. If you choose to include the frame in the returned image, then the values
of m and n correspond to the first and second
elements of the CFAImageSize field reported by
rawinfo, respectively. For both types of returned images, the
value of p depends on the type of CFA sensor. For Bayer type sensors,
the value is 1. For a Foveon sensor, the value is 3.
The RAW file format preserves image data in its most unedited state,
recorded directly from the camera sensor. Most camera manufacturers define their own
proprietary RAW file format, such as the Nikon NEF file format and the Canon CRW format.
Adobe has also defined a RAW file format, DNG (digital negative), which is supported by
several cameras. The name of the format is typically capitalized, like other file formats
such as JPG and TIF. However, unlike other file formats, RAW is not an acronym.
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