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imagemodel

Image model object

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Description

An image model object stores information about an image such as class, type, display range, width, height, minimum intensity value and maximum intensity value.

The image model object supports functions that you can use to access this information, get information about the pixels in an image, and perform special text formatting. An imagemodel object works by querying the target image CData.

Creation

Syntax

imgmodel = imagemodel(himage)

Description

imgmodel = imagemodel(himage) creates an image model object associated with a target image himage.

If himage is an array of image objects, then imgmodel is an array of image model objects.

example

Input Arguments

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Target image, specified as a handle or array of handles to image objects.

Object Functions

getClassTypeGet class of image from image model
getDisplayRangeGet display range of image from image model
getImageHeightGet height of image from image model
getImageTypeGet type of image from image model
getImageWidthGet width of image from image model
getMaxIntensityGet maximum value of image from image model
getMinIntensityGet minimum value of image from image model
getNumberFormatFcnGet function handle that converts numeric value into character vector
getPixelInfoStringGet pixel value as character vector
getPixelRegionFormatFcnGet function handle that formats pixel value into character vector
getPixelValueGet pixel value as numeric array
getDefaultPixelInfoStringGet default pixel value as character vector
getDefaultPixelRegionStringGet type of information displayed in Pixel Region tool as character vector
getScreenPixelRGBValueGet screen value of specified pixel in image model
getimagemodelImage model object from image object

Examples

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Open Live Script

Create an image model associated with a single image object.

h = imshow('peppers.png');

Figure contains an axes object. The hidden axes object contains an object of type image.

im = imagemodel(h)
 
im =
 
IMAGEMODEL object accessing an image with these properties:

       ClassType: 'uint8'
    DisplayRange: []
     ImageHeight: 384
       ImageType: 'truecolor'
      ImageWidth: 512
    MinIntensity: []
    MaxIntensity: []

Create an image model for an array of image object handles.

figure
subplot(1,2,1)
h1 = imshow('hestain.png');
subplot(1,2,2)
h2 = imshow('coins.png');

Figure contains 2 axes objects. Hidden axes object 1 contains an object of type image. Hidden axes object 2 contains an object of type image.

im = imagemodel([h1 h2])
 
im =
 
1x2 array of IMAGEMODEL objects.
Open Live Script

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');

Figure contains an axes object. The hidden axes object contains an object of type image.

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...'}

Version History

Introduced before R2006a

See Also

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