[openCV] 偵測像素變化值控制LED亮暗

在影像定義ROI並上貼上開關圖示

1. cv::Mat lightImg = cv::imread("lightOn.jpg");
2. cv::Mat lightImg_2 = cv::imread("lightOff.jpg");
3. cv::Mat lightOnROI,
4. cv::Mat lightOffROI;
5. lightOnROI = image(cv::Rect(0,0,lightImg.size().width,lightImg.size().height));
6. lightOffROI = image(cv::Rect(image.size().width-lightImg.size().width,0,lightImg.size().width,lightImg.size().height));
7. cv::addWeighted(lightOnROI,1.0,lightImg,1.0,0.,lightOnROI);
8. cv::addWeighted(lightOffROI,1.0,lightImg_2,1.0,0.,lightOffROI);

掃左上角4x4 pixels(可擴充)，看看每個值是不是有變化到某個程度  lightThreshold

1. for(int y=0;y<2;y++)
2. {
3. for(int x=0;x<2;x++)
4. {
5. /cout<<y<<","<<x<<","<<z<<endl;
6. if(abs(nowValue[z]-tempValue[z])>lightThreshold)   //light 門檻
7. {
8. //cout<<"LightOn"<<endl;
9. tempValue[z] = nowValue[z];
10. lightState = 1;
11. }
12. int redValue = image.at<cv::Vec3b>(y,x)[0];
13. int greenValue = image.at<cv::Vec3b>(y,x)[1];
14. int blueValue = image.at<cv::Vec3b>(y,x)[2];
15. nowValue[z++] = redValue + greenValue + blueValue;
16. //cout<<"tempValue:"<<tempValue[z]<<","<<"nowValue:"<<nowValue[z]<<endl;
17. if(z>3)
18. {
19. z=0;
20. }
22. }
23. }

觸碰左右圖示即改變像素值，控制LED亮暗

arduino端接收

• if(Serial.available()>0)
• lightState = Serial.read();

程式碼

•  https://drive.google.com/file/d/0B3iLa8F71LQwemVPNm1LUE96SW8/edit?usp=sharing