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opencv - Show webcam sequence TkInter
    I did a program with python, importing the OpenCV's libraries. Now, I'm doing the GUI in Tkinter. I'm ... push button to quit the program. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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534 views
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opencv - What does the distance attribute in DMatches mean?
    I have a short question: When I do feature-matching in OpenCV, what does the distance attribute mean of DMatches in ... it a kind of deviation? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.1k views
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opencv - How to remove watermark background in image Python
    I have a image like below, I would like to remove background watermark. So far I tried, inpainting method ... help would be more appreciable. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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973 views
1 answer
opencv - Detecting hair in a portrait image?
    What would be the best approach for detecting and removing a person's hair in a simple portrait image ? Any useful ... it could be of some use See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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709 views
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opencv - color replacement in image for iphone application
    Basically i want to implement color replacement feature for my paint application. Below are original and expected ... other solution to tryout. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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727 views
1 answer
opencv - What exactly is BGR color space?
    An RGB color is composed of three components: Red (0-255), Green (0-255) and Blue (0-255). What ... is it different from RGB color space? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.0k views
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opencv - Change type of Mat object from CV_32F to CV_8U
    I tried to display an image of CV_32F type using imshow function but it showed a WHITE image. In the ... which are assigned during processing. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - convert Bitmap to Mat after capture image using android camera
    Mat b = new Mat(); Bitmap bmp = getIntent().getExtras().getParcelable("image_send"); @Override protected ... stopped after taking a picture. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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823 views
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opencv - Capture video data from screen in Python
    Is there a way with Python (maybe with OpenCV or PIL) to continuously grab frames of all or a portion of the ... (probably after re-sizing it). See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.2k views
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opencv - Convert a string of bytes to cv::mat
    I need to implement a function that receives a string containing the bytes of an image (received via boost socket ... for Mat from a string? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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635 views
1 answer
opencv finding image cordinates on another image
    How to find image "A" coordinates on image "B" which contains image "A". I wrote this program which is only ... there any library tool do this. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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413 views
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opencv - Android video encoding with fr and resolution manipulation
    I want to be able to take a video recorded with an Android device and encode it to a new Resolution and Frame ... time, etc.) Thanks in advance! See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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874 views
1 answer
opencv - How to get 3D coordinate Axes of head pose estimation in Dlib C++
    Dlib C++ can detect landmark and estimate face pose very well. However, how can I get 3D coordinate Axes direction (x,y,z) of head pose? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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536 views
1 answer
opencv - trying to understand the Affine Transform
    I am playing with the affine transform in OpenCV and I am having trouble getting an intuitive understanding of it ... to the dstTri[] represent? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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800 views
1 answer
opencv - Drawing rectangle or line using mouse events in open cv using python
    I am trying to draw a straight line between two coordinates which would be obtained by clicking on the image or by ... I click on the image? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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769 views
1 answer
opencv - Most "stable" color representation : RGB? HSV? CIELAB?
    There are several color representations in computer science : the standard RGB, but also HSV, HSL, CIE XYZ, YCC ... the cloud to its barycenter. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.5k views
1 answer
opencv - Converting a 2D image point to a 3D world point
    I know that in the general case, making this conversion is impossible since depth information is lost going from ... explain how you derive it? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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692 views
1 answer
opencv - How to train cascade properly
    What is the posible reason of "Required leaf false alarm rate achieved. Branch training terminated." The folowing ... h 35 RESULT OF TRAINING See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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673 views
1 answer
opencv - About Makefile can't find libraries
    The Exception is here: g++ -L/usr/local/lib -I./include -I. -lopencv_core -lopencv_highgui -lopencv_imgproc ... , which has opencv libraries. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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620 views
1 answer
opencv - Determine if an image exists within a larger image, and if so, find it, using Python
    I need a Python program that I am working on to be able to take a small image, determine if it exists inside ... idea about how to do this? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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524 views
1 answer
opencv - How to directly rotate CVImageBuffer image in IOS 4 without converting to UIImage?
    I am using OpenCV 2.2 on the iPhone to detect faces. I'm using the IOS 4's AVCaptureSession to get ... withObject:nil waitUntilDone:NO]; } } See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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799 views
1 answer
opencv - PyLint not recognizing cv2 members
    I am running pylint on an opencv project and I am getting many pylint errors in VS code about members not being present. ... 8.1 , astroid 1.6.0 See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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955 views
1 answer
opencv - How to check if obtained homography matrix is good?
    This question was already asked, but I still don't get it. I obtain a homography matrix by calling cv ... homography matrix itself is adequate? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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600 views
1 answer
opencv - Are there any fast alternatives to SURF and SIFT for scale-invariant feature extraction?
    SURF is patented, as is SIFT. ORB and BRIEF are not patented, but their features are not scale-invariant, ... patented as SURF and SIFT? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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630 views
1 answer
opencv - grab frame NTSCtoUSB dongle, opencv2, python wrapper
    Context: I have been playing around with python's wrapper for opencv2. I wanted to play with a few ideas ... are most welcome! Thanks Cheers See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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561 views
1 answer
opencv - iOS:Retrieve rectangle shaped image from the background image
    I am working on an implementation where I have a rectangle shaped image in an big background image. I am trying ... return image; } Thank you. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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945 views
1 answer
opencv - Rotate image by 90, 180 or 270 degrees
    I need to rotate an image by either 90, 180 or 270 degrees. In OpenCV4Android I can use: Imgproc. ... 90 or 270 degree rotations? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.2k views
1 answer
opencv - How to load png images with 4 channels?
    I have been trying to load .png files with transparency channel (RGB and Alph) with no luck. It appears that ... source code and rebuild it? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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