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cv2 image croll

Sparkling Starling answered on December 17, 2022 Popularity 1/10 Helpfulness 1/10

answer cv2 image croll

cv2 image croll

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int slider_max, slider, displayHeight;
int displayWidth = 1900;
Mat src1;  // original big image
Mat dst;
cv::Rect roi;

static void on_trackbar(int, void*)
{
    roi = cv::Rect(slider, 0, displayWidth, displayHeight);  //Update ROI for display
    dst = src1(roi);

    imshow("Result", dst);
}
int main(void)
{
    src1 = imread("BigImg.jpg");  // your big image
    cv::rotate(src1, src1, cv::ROTATE_90_CLOCKWISE); //I rotate my image because opencv trackbar is displayed horizontally 
    cv::resize(src1, src1, cv::Size(src1.cols/2, src1.rows/2));  // resize the image if it's too big to display in 1 window
    if (src1.empty()) { cout << "Error loading src1 \n"; return -1; }

    slider_max = src1.cols - displayWidth;
    slider = 0;
    displayHeight = src1.rows;

    namedWindow("Result", WINDOW_AUTOSIZE); // Create Window
    char TrackbarName[50];
    sprintf(TrackbarName, "Pixel Pos");
    createTrackbar(TrackbarName, "Result", &slider, slider_max, on_trackbar);
    on_trackbar(slider, 0);
    waitKey(0);
    return 0;
}

Popularity 1/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: cv2 image python

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