cv::minMaxLoc()

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本文介绍了一个C++函数minMaxLoc，该函数用于在一个单通道数组中查找全局最小值和最大值及其位置。无论是在整个数组还是指定的子区域中，此函数都能找到所需的极值。

Finds the global minimum and maximum in an array.
找出最大值和最小值，其中返回值必须为double类型。

C++: void minMaxLoc(InputArray src, double* minVal, double* maxVal=0, Point* minLoc=0, Point* maxLoc=0, InputArray mask=noArray())

Parameters:
src – Source single-channel array.
minVal – Pointer to the returned minimum value. NULL is used if not required.
maxVal – Pointer to the returned maximum value. NULL is used if not required.
minLoc – Pointer to the returned minimum location (in 2D case). NULL is used if not required.
maxLoc – Pointer to the returned maximum location (in 2D case). NULL is used if not required.
mask – Optional mask used to select a sub-array.
The functions minMaxLoc find the minimum and maximum element values and their positions. The extremums are searched across the whole array or, if mask is not an empty array, in the specified array region.

The functions do not work with multi-channel arrays. If you need to find minimum or maximum elements across all the channels, use Mat::reshape() first to reinterpret the array as single-channel. Or you may extract the particular channel using either extractImageCOI() , or *mixChannels() , or split() .*