C++ 如何在opencv中使用erode和dilate函数？
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原文地址: http://stackoverflow.com/questions/17329932/
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How to use erode and dilate function in opencv?
提问by U23r
I'm trying to eliminate the thing around the number with erode and dilate process. I tryed but nothing happened. I changed the values just for see if would change something, but again, nothing has changed. The image continues like in the link above. What about this parameters... I read the documentation but don't quite understand (as you can see, I was guessing in the function). What am I doing wrong?
我试图通过侵蚀和扩张过程消除数字周围的东西。我试过了，但什么也没发生。我改变了这些值只是为了看看是否会改变一些东西，但同样，什么都没有改变。图像继续像上面的链接一样。这个参数怎么样......我阅读了文档但不太明白（如你所见，我在函数中猜测）。我究竟做错了什么？
the image: https://docs.google.com/file/d/0BzUNc6BOkYrNeVhYUk1oQjFSQTQ/edit?usp=sharing
图片：https: //docs.google.com/file/d/0BzUNc6BOkYrNeVhYUk1oQjFSQTQ/edit?usp=sharing
the code:
编码：
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
int main ( int argc, char **argv )
{
Mat im_gray;
Mat img_bw;
Mat img_final;
Mat im_rgb = imread("cam.jpg");
cvtColor(im_rgb,im_gray,CV_RGB2GRAY);
adaptiveThreshold(im_gray, img_bw, 255, ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY_INV, 105, 1);
dilate(img_bw, img_final, 0, Point(-1, -1), 2, 1, 1);
imwrite("cam_final.jpg", img_final);
return 0;
}
回答by Esenti
According to official docs, the third argument should be the kernel (or structuring element). You are currently passing 0:
根据官方文档，第三个参数应该是内核（或结构元素）。您当前正在传递 0：
dilate(img_bw, img_final, 0, Point(-1, -1), 2, 1, 1);
Try rewriting it this way:
尝试以这种方式重写它：
dilate(img_bw, img_final, Mat(), Point(-1, -1), 2, 1, 1);
In this case, a default 3x3 kernel will be used.
在这种情况下，将使用默认的 3x3 内核。
回答by Tarun
Kernel is basically a matrix. This is multiplied or overlapped on the input matrix(image) to produce the desired output modified(in this case dilated) matrix(image).
内核基本上是一个矩阵。这是在输入矩阵（图像）上相乘或重叠以产生所需的输出修改（在这种情况下是扩张的）矩阵（图像）。
Try changing the parameters of Mat()in
dilate(img_bw, img_final, Mat(), Point(-1, -1), 2, 1, 1);you're basically changing the number of pixels (height and width) of the kernel, which will change the dilation effect on the original pic.
尝试更改Mat()in的参数dilate(img_bw, img_final, Mat(), Point(-1, -1), 2, 1, 1);基本上是在
更改内核的像素数（高度和宽度），这将改变原始图片的膨胀效果。
So in the parameters of dilateyou use Mat()instead of a number as already stated by esenti.
因此，在dilate您使用的参数中，Mat()而不是 esenti 已经声明的数字。
