getNumberFormatFcn
Get function handle that converts numeric value into character vector
Description
Examples
Get Grayscale Pixel Value 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 grayscale image.
h = imshow('liftingbody.png');
im = imagemodel(h)
im = IMAGEMODEL object accessing an image with these properties: ClassType: 'uint8' DisplayRange: [0 255] ImageHeight: 512 ImageType: 'intensity' ImageWidth: 512 MinIntensity: 0 MaxIntensity: 255
Select a pixel by specifying the row and column coordinates. This pixel has (row, column) coordinates (50, 250).
r = 50; c = 250;
Get the numeric value of the pixel using the getPixelValue
function.
pxValue = getPixelValue(im,r,c)
pxValue = uint8
151
Convert the numeric pixel value to a string. First, get a function formatFcn
that formats numeric pixel values by using the getNumberFormatFcn
. Then, specify the numeric value of the pixel as the input argument to formatFcn
to get the formatted string.
formatFcn = getNumberFormatFcn(im); pxValueStr = formatFcn(pxValue)
pxValueStr = '151'
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 = 'Intensity'
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 = '151'
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 = '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
{'151'}
Input Arguments
imgmodel
— Image model
scalar imagemodel
object
Image model, specified as a scalar imagemodel
object.
Output Arguments
fun
— Number format function
function handle
Number format function that converts numeric values into character vectors, returned
as a function handle. fun
accepts one input argument, a numeric
scalar or logical scalar. fun
returns the number as a character
vector.
Data Types: function_handle
Version History
Introduced before R2006a
See Also
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