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step

System object: vision.GeometricScaler
Package: vision

Resize image

Syntax

J = step(H,I)
J = step(H,X,ROI)
[J,FLAG] = step(H,I,ROI)

Description

    Note:   Starting in R2016b, instead of using the step method to perform the operation defined by the System object™, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.

J = step(H,I) returns a resized image, J, of input image I.

J = step(H,X,ROI) resizes a particular region of the image I defined by the ROI input. This applies when you set the SizeMethod property to Number of output rows and columns, the Antialiasing property to false, the InterpolationMethod property to Bilinear, Bicubic or Nearest neighbor, and the ROIProcessing property to true.

[J,FLAG] = step(H,I,ROI) also returns FLAG which indicates whether the given region of interest is within the image bounds. This applies when you set the SizeMethod property to Number of output rows and columns, the Antialiasing property to false, the InterpolationMethod property to Bilinear, Bicubic or Nearest neighbor and, the ROIProcessing and the ROIValidityOutputPort properties to true.

    Note:   H specifies the System object on which to run this step method.

    The object performs an initialization the first time the step method is executed. This initialization locks nontunable properties and input specifications, such as dimensions, complexity, and data type of the input data. If you change a nontunable property or an input specification, the System object issues an error. To change nontunable properties or inputs, you must first call the release method to unlock the object.

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