getPixelInfoString
Get pixel value as character vector
Description
Examples
Get RGB Pixel Values From Image Model
Pixel values obtained from an imagemodel
object can be returned in several formats suitable for display in different interactive image processing tools.
Create an image model associated with a color image.
h = imshow('flamingos.jpg');
im = imagemodel(h)
im = IMAGEMODEL object accessing an image with these properties: ClassType: 'uint8' DisplayRange: [] ImageHeight: 972 ImageType: 'truecolor' ImageWidth: 1296 MinIntensity: [] MaxIntensity: []
Select a pixel by specifying row and column coordinates. This pixel has (row, column) coordinates (100, 200).
r = 100; c = 200;
Get the numeric value of the pixel using the getPixelValue
function.
pxValue = getPixelValue(im,r,c)
pxValue = 1x3 uint8 row vector
104 95 54
Get the default pixel information string using the getDefaultPixelInfoString
function. This string depends on the type of image but does not use the pixel values. The pixel information string is suitable for use with the Pixel Information tool.
defaultPxInfoStr = getDefaultPixelInfoString(im)
defaultPxInfoStr = '[R G B]'
Using the same string format, get the pixel information string for the specified pixel by using the getPixelInfoString
function.
pxInfoStr = getPixelInfoString(im,r,c)
pxInfoStr = '[104 95 54]'
Get the default pixel region string using the getDefaultPixelRegionString
function. This string depends on the type of image but does not use the pixel values. The pixel region string is suitable for use with the Pixel Region tool.
defaultPxRegStr = getDefaultPixelRegionString(im)
defaultPxRegStr = 'R:000 G:000 B:000'
There are two steps to get the pixel region string for the specified pixel in the same string format. First, get a function formatFcn
that formats numeric pixel values by using the getPixelRegionFormatFcn
function. Then, specify the row and column coordinate of the pixel as input arguments to formatFcn
to get the formatted string.
formatFcn = getPixelRegionFormatFcn(im); pxRegStr = formatFcn(r,c)
pxRegStr = 1x1 cell array
{'R:104...'}
Input Arguments
imgmodel
— Image model
scalar imagemodel
object
Image model, specified as a scalar imagemodel
object.
r
— Row coordinate
positive integer
Row coordinate of pixel, specified as a positive integer.
c
— Column coordinate
positive integer
Column coordinate of pixel, specified as a positive integer.
Output Arguments
pixval
— Pixel value
character vector
Pixel value, returned as a character vector. The table shows the character vector returned for a black pixel for each image type.
Image Type | Sample Pixel Value |
---|---|
Grayscale | '000' |
Truecolor (RGB) | '[0 0 0]' |
Binary | '0' |
Indexed | '<000> [0 0 0]' |
Data Types: char
Version History
Introduced before R2006a
See Also
getPixelRegionFormatFcn
| getPixelValue
| impixelinfo
| impixelinfoval
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