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How do you save images of detected objects in OpenCV?


How do you save images of detected objects in OpenCV?

By : user2955555
Date : November 22 2020, 10:40 AM
This might help you The function call that detects the face will most probably contain a boundingRectangle parameter of type vector. Use the data present in it to select the Region of Interest(ROI) if a face is detected. This selected ROI can then be saved using this function.
These are the very basics of OpenCV and hence I am not including any code snippets along with my answer.
code :


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Tracking multiple moving objects with KalmanFilter in OpenCV/C++ - How to assign tracks individually to detected objects

Tracking multiple moving objects with KalmanFilter in OpenCV/C++ - How to assign tracks individually to detected objects


By : user2571713
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am working on realtime movement detection and object tracking in OpenCV/C++ and am currently stuck at the tracking part. , try something like this:
code :
for each contour:
    if its already tracked with ID 'A': kalmanFilter_with_id_A.track(x,y);
    else createNewKalmanFilterWithID A
for each contour 'currentFrameC':
    for each contour 'lastFrameC'
        if distance(currentFrameC, lastFrameC) is smallest and < threshold
            currentFrameC is the same object as lastFrameC so give it the same ID
    if no shortest contour with dist < thres was found, create a new object with a new ID and create a new KalmanFilter with this same ID for that object

call kalmanFilter with ID for each found contour ID
How to save detected face in Android using OpenCV?

How to save detected face in Android using OpenCV?


By : user3106911
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem is, you are never trying to get the face pixels. After you detect face, I suggest you to do something such as:
code :
Mat mFaceMatrix = mRgba.submat(facesArray.y, facesArray.y + facesArray.heigth, facesArray.x, facesArray.x + facesArray.width);
Bitmap bitmap = Bitmap.createBitmap(mFaceMatrix.cols(), mFaceMatrix.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(mFaceMatrix, bitmap);
Align images based on a detected features in Opencv

Align images based on a detected features in Opencv


By : oldschool
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Hi I've a base image and other images that I'd like to rotate with the same angle as the base image. , I remade your function without using the angles:
code :
void rotate(cv::Mat& originalImage,cv::Mat& rotatedImage,cv::InputArray rotated,
cv::Mat& dst) {
    std::vector<cv::Point2f> original(4);
    original[0] = cv::Point( 0, 0);
    original[1] = cv::Point( originalImage.cols, 0 );
    original[2] = cv::Point( originalImage.cols, originalImage.rows );
    original[3] = cv::Point( 0, originalImage.rows );

    dst = cv::Mat::zeros(originalImage.rows, originalImage.cols, CV_8UC3);
    cv::Mat transform = cv::getPerspectiveTransform(rotated, original);
    cv::warpPerspective(rotatedImage, dst, transform, dst.size() );
}
Extract detected objects and save to different images - OpenCV Python

Extract detected objects and save to different images - OpenCV Python


By : brownianwalker
Date : March 29 2020, 07:55 AM
around this issue There are different parameters that you have to try in order to extract what you need.
Using the snippet below I extracted all but one blob:
code :
mser = cv2.MSER_create( _min_area = 5000, _max_variation = 1.0)
How to save faces detected by opencv

How to save faces detected by opencv


By : user2987365
Date : March 29 2020, 07:55 AM
This might help you detectMultiScale method returns a list where each elements contains the coordinates and width and height of each face that is detected.
So you can use cv2.imwrite and array slicing:
code :
count = 0
for (x,y,w,h) in faces:
        face = img[y:y+h, x:x+w] #slice the face from the image
        cv2.imwrite(str(count)+'.jpg', face) #save the image
        count+=1
        cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
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