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System object: vision.LocalMaximaFinder
Package: vision

Find local maxima in input image


IDX = step(H,I)
[...] = step(H,I,THRESH)



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.

IDX = step(H,I) returns [x y] coordinates of the local maxima in an M-by-2 matrix, IDX, where M represents the number of local maximas found. The maximum value of M may not exceed the value set in the MaximumNumLocalMaxima property.

[...] = step(H,I,THRESH) finds the local maxima in input image I, using the threshold value THRESH, when you set the ThresholdSource property to Input port.


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.