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Vision.localmaximafinder

Find local maxima in matrices

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Description

To find local maxima in matrices.

  1. Create theVision.localmaximafinderobject and set its properties.

  2. Call the object with arguments, as if it were a function.

To learn more about how System objects work, seeWhat Are System Objects?

Creation

Syntax

lmaxfinder= vision.LocalMaximaFinder
lmaxfinder= vision.LocalMaximaFinder(maxnum,neighborsize)
lmaxfinder = vision.localmaximafinder（名称，值）

Description

example

lmaxfinder= vision.LocalMaximaFinderreturns a local maxima finder System object,H，这在输入矩阵中找到了本地最大值。

lmaxfinder= vision.LocalMaximaFinder(maxnum,neighborsize)returns a local maxima finder object with theMaximumNumLocalMaximaproperty set tomaxnum,邻里property set toneighborsize, and other specified properties set to the specified values.

lmaxfinder= vision.LocalMaximaFinder(Name,Value)sets properties using one or more name-value pairs. Enclose each property name in quotes. For example,lmaxfinder= vision.LocalMaximaFinder('ThresholdSource','Property')

Properties

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Unless otherwise indicated, properties arenontunable，这意味着您在调用对象后不能更改其值。呼叫时锁定对象，然后release功能解锁它们。

If a property istunable, you can change its value at any time.

For more information on changing property values, seeSystem Design in MATLAB Using System Objects。

最大最大数量可以找到，指定为正标性整数。

零元值的邻域大小, specified as a two-element vector

Source of threshold, specified as'Property'或者'Input port'。

所有最大值应匹配或超过的值，指定为MATLAB的标量®内置数字数据类型。当您设置该属性时，此属性将适用ThresholdSourceproperty to'Property'。

可调:Yes

Indicator of Hough transform matrix input, specified as真的或者false。该块适用于其他处理，特定于输入矩阵的右侧和左边界的Hough变换。将此属性设置为真的if the input is antisymmetric about the rho axis and the theta value ranges from − π 2 to π 2 radians, which correspond to a Hough matrix.

数据类型的索引值, specified asdouble,single,uint8,UINT16, oruint32。

用法

Syntax

idx = LMaxFinder(I)
idx = LMaxFinder(I,threshold)

Description

example

idx= lmaxfinder（I)returns [xy] coordinates of the local maxima in anM-by-2 matrix,idx。M表示发现的局部最大值的数量。最大值Mmay not exceed the value set in theMaximumNumLocalMaximaproperty.

idx= lmaxfinder（I,临界点)finds the local maxima in the input imageI，使用阈值值临界点, when you set theThresholdSourceproperty to'Input port'。

Input Arguments

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Video frame, specified as grayscale or truecolor (RGB).

所有最大值应匹配或超过的值，指定为MATLAB的标量内置数字数据类型。

Output Arguments

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Local maxima, returned as anM-by-2 matrix of one-based [xy]坐标，哪里M表示发现的局部最大值的数量。

Object Functions

要使用对象函数，请将System Object™指定为第一个输入参数。例如，释放名称的系统对象的系统资源obj，使用此语法：

release(obj)

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initialize Initialize video frame and points to track
step RunSystem objectalgorithm
release Release resources and allow changes toSystem objectproperty values and input characteristics
reset 重置内部状态System object

Examples

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打开实时脚本

Create an example input.

I = [0 0 0 0 0 0 0 0 0 0 0 0;。。。0 0 0 1 1 2 3 2 1 1 0 0;。。。0 0 0 1 2 3 4 3 2 1 0 0;。。。0 0 0 1 3 5 7 5 3 1 0 0;。。。0 0 0 1 2 3 4 3 2 1 0 0;。。。0 0 0 1 1 2 3 2 1 1 0 0;。。。0 0 0 0 0 0 0 0 0 0 0 0 0];

Create a local maxima finder object.

hLocalMax = vision.LocalMaximaFinder('Maximummummlocalmaxima',1,。。。'NeighborhoodSize',[3,3],。。。'Threshold'，1）;

Find local maxima.

位置= hlocalmax（i）
位置=1x2 uint32 row vector7 4

Extended Capabilities

已经rsion History

在R2012B中引入

See Also

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