opencv的錯誤，同時用C++

Question

我建立在C變化檢測一個代碼++使用的OpenCV但是建立它這代碼顯示運行時錯誤如果我改變圖像

void MainWindow::on_pushButton_2_clicked() 
{ 

    cv::Mat input1 = cv::imread("C:\\Users\\trainee2017233\\Desktop\\pre-post\\sulamani_ms1p1_pre_gref.tif"); 
    cv::Mat input2 = cv::imread("C:\\Users\\trainee2017233\\Desktop\\post-post\\sulamani_ms1p1_pre_gref.tif"); 

    cv::Mat diff; 
    cv::absdiff(input1, input2, diff); 

    cv::Mat diff1Channel; 
    // WARNING: this will weight channels differently! - instead you might want some different metric here. e.g. (R+B+G)/3 or MAX(R,G,B) 
    cv::cvtColor(diff, diff1Channel, CV_BGR2GRAY); 

    float threshold = 30; // pixel may differ only up to "threshold" to count as being "similar" 

    cv::Mat mask = diff1Channel < threshold; 

    cv::imshow("similar in both images" , mask); 

    // use similar regions in new image: Use black as background 
    cv::Mat similarRegions(input1.size(), input1.type(), cv::Scalar::all(0)); 

    // copy masked area 
    input1.copyTo(similarRegions, mask); 


    cv::imshow("input1", input1); 
    cv::imshow("input2", input2); 
    cv::imshow("similar regions", similarRegions); 
    cv::imwrite("../outputData/Similar_result.png", similarRegions); 
    cv::waitKey(0); 

} 

當我寫兩個圖像作爲相同圖像則沒有錯誤是存在的，但同時，他們更換不同的圖像則顯示錯誤

OpenCV Error: Sizes of input arguments do not match (The operation is neither 'array op array' (where arrays have the same size and the same number of channels), nor 'array op scalar', nor 'scalar op array') in arithm_op, file D:\opencv\sources\modules\core\src\arithm.cpp, line 659 

Answer 1

這裏input1和input2應該是相同的大小爲功能absdiff

... 
cv::resize(input2, input2, input1.size()); 
cv::Mat diff; 
...