如何将OpenCV Mat的所有像素设置为特定值?

问题描述

我有一个CV_8UC1类型的图像.如何将所有像素值设置为特定值?

I have an image of type CV_8UC1. How can I set all pixel values to a specific value?

推荐答案

• 对于灰度图像:

  cv::Mat m(100, 100, CV_8UC1); //gray
  m = Scalar(5);  //used only Scalar.val[0]
  

  或

  cv::Mat m(100, 100, CV_8UC1); //gray
  m.setTo(Scalar(5));  //used only Scalar.val[0]
  

  或

  Mat mat = Mat(100, 100, CV_8UC1, cv::Scalar(5));
  

• 用于彩色图像(例如3个通道)

  cv::Mat m(100, 100, CV_8UC3); //3-channel
  m = Scalar(5, 10, 15);  //Scalar.val[0-2] used
  

  或

  cv::Mat m(100, 100, CV_8UC3); //3-channel
  m.setTo(Scalar(5, 10, 15));  //Scalar.val[0-2] used
  

  或

  Mat mat = Mat(100, 100, CV_8UC3, cv::Scalar(5,10,15));
  

PS :如果您进一步想知道如何设置给定值，请查看此线程将cv::Mat的通道有效地转换为给定值，而无需更改其他通道.

P.S.: Check out this thread if you further want to know how to set given channel of a cv::Mat to a given value efficiently without changing other channels.

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