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This article mainly introduces "how to use the OpenCV copyTo () function". In the daily operation, I believe that many people have doubts about how to use the OpenCV copyTo () function. The editor has consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use the OpenCV copyTo () function". Next, please follow the editor to study!

CopyTo () function prototype

The function copyTo can be defined in two ways, namely:

Void copyTo (OutputArray m) const;void copyTo (OutputArray m, InputArray mask) const

Parameters:

One parameter: one output image

Two parameters: an output image and a mask image

Simple exampl

For example:

Image_in.copyTo (image_out)

Is to copy (copy to) the picture of image_in to image_out.

Another example is:

Image_in.copyTo (image_out,mask)

Not only will the image_in image be copied (copy to) to the image_out, but also the pixels with a value of 0 in the mask corresponding to the image_in will not be pasted to the image_out.

Summarize the usefulness of the above two functions:

One parameter: indicates that the image_in matrix is copied into image_out.

Two parameters: a matrix image_out that represents an additional mask mask.

A parameter is very simple to copy the image, the above reading mask usage is not deep, then we continue to explore the use of the mask parameter

An in-depth study of mask parameters

For example, the following usage code:

A.copyTo (B, mask)

As a mask, if mask has a value of 1 at a pixel (I, j) (only look at the first channel, so mask single channel is OK), then assign the value at A.at (I, j) directly to B.at (I, j), and if its value is 0, then B.at (I, j) retains its original pixel value. This makes the color of the edge of the icon consistent with the original image.

For example, the following specific usage

# include # include using namespace cv;using namespace std;int main () {Mat srcImage = imread (". / test1.jpg"); Mat dstImage = imread (". / test.jpg"); if (! srcImage.data | |! dstImage.data) {cout

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