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opencv - java.lang.UnsatisfiedLinkError: Native Library XXX.so already loaded in another classloader
    I have deployed one web-application, which contains following code. System.loadLibrary(org.opencv.core.Core. ... (Highgui.java:362) See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - sift = cv2.xfeatures2d.SIFT_create() not working even though have contrib installed
    So I am trying to use: sift = cv2.xfeatures2d.SIFT_create() and it is coming up with this error: cv2.error ... I have not included enough info See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Extracting DCT coefficients from encoded images and video
    Is there a way to easily extract the DCT coefficients (and quantization parameters) from encoded images and video ... DCT coefficients as well? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Face Detection in Android?
    I am currently working on an experimental camera app. I'm looking into implementing face detection at ... library? Implementing a particular algorithm myself? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Displaying stitched images together without cutoff using warpAffine
    I'm trying to stitch 2 images together by using template matching find 3 sets of points which I pass to cv2. ... , this tutorial and this example from the docs. Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - How to reduce number of classes in YOLOv3 files?
    I am using YOLOv3 to detect cars in videos. I downloaded three files used in my code coco.names, yolov3.cfg ... . Can anyone help me in modifying these files? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - I want to change the colors in image with python from specific color range to another color
    I want to change the brown areas to RED (or another color). Just I don't know how to get the ranges for brown ... , but not a range of colors. Any Ideas? Thanks Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Simple and fast method to compare images for similarity
    I need a simple and fast way to compare two images for similarity. I.e. I want to get a high ... is locality-sensitive hashing and nearest neighbor search. Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Is there a way to detect if an image is blurry?
    Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - CV - Extract differences between two images
    I am currently working on an intrusion system based on video surveillance. In order to complete this task, I take a ... here, but I am open to any solution. Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Computing camera pose with homography matrix based on 4 coplanar points
    I have 4 coplanar points in a video (or image) representing a quad (not necessarily a square or rectangle) and ... and it seems to solve some problems as well. Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Computing x,y coordinate (3D) from image point
    I have a task to locate an object in 3D coordinate system. Since I have to get almost exact X and Y ... help me with that, do you have any suggestions? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - How to verify the correctness of calibration of a webcam?
    I am totally new to camera calibration techniques... I am using OpenCV chessboard technique... I am ... than CV_CALIB_FIX_ASPECT_RATIO?. If yes, which one? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Python Extract number from simple Image
    I have the following image lower = np.array([175, 125, 45], dtype="uint8") upper = np.array([ ... ://stackoverflow.com/questions/65832561/python-extract-number-from-simple-image...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Streaming audio and video in python from a server to a client
    I am currently working on streaming sync audio and video from a server to a client. I managed to stream the video ... streaming-audio-and-video-in-python-from-a-server-to-a-client...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Failed building wheel for zbar in Raspberry Pi3
    I wanna use the OpenCV and the camera module to recognize the qr code with Raspberry Pi3. And I followed ... com/questions/65856309/failed-building-wheel-for-zbar-in-raspberry-pi3...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Detecting artifact differences between two images
    I want to programmatically detect a "material difference" between two images ignoring cropping and scaling ... /questions/65862499/detecting-artifact-differences-between-two-images...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - How to get the Projection and modelview matrix from a camera's intrinsic parameters from calibrateCamera() and extrinsic parameters from solvePnP()?
    How to get the Projection and modelview matrix from a camera's intrinsic parameters from calibrateCamera() and ... -projection-and-modelview-matrix-from-a-cameras-intrinsic-paramet...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Does deleting build folder that generated by CMake effect anything?
    Ive compiled my OpenCV-Python using CMake-gui in Windows 10, CMake generated over 11GB binary files. Is it ... /does-deleting-build-folder-that-generated-by-cmake-effect-anything...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.2k views
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opencv - Normalizing image in Shape from Shading
    Im going over this paper by Vogel A Direct Numerical Approach to Perspective Shape-from-Shading. I have ... .com/questions/65873691/normalizing-image-in-shape-from-shading...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Best Way to Find Circles in Image using Python
    I wish to approximately count the total number of storage tanks (i.e. the white circles) in this satellite ... questions/65894829/best-way-to-find-circles-in-image-using-python...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Disparity map and finding distance point Z wrong
    i would need some help for getting correct distance from disparity map ( had read through the opencv Book ... questions/65895053/disparity-map-and-finding-distance-point-z-wrong...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - Count moving objects in a specific rectangular area instead of reference line. Failing to monitor a boxed area
    https://github.com/Anishauday/MovingObjectcountingSpecificArea/blob/main/counter.py #Check if an object is exiting from ... a-specific-rectangular-area-instead-of-reference-line-f...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - How to create 3D Bounding Boxes of Books on a Shelf from RGB-D Images
    I am trying to use an RGB-D camera to detect 3D bounding boxes of books on a shelf. Here are some examples of ... create-3d-bounding-boxes-of-books-on-a-shelf-from-rgb-d-images...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.3k views
1 answer
opencv - How do I convert a Four CC to a file extension?
    I'm making a program that must process a live video feed and potentially saves the short clips of the feed to a file. ... /65948374/how-do-i-convert-a-four-cc-to-a-file-extension...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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999 views
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opencv - Django cut and put only the face in the picture field using opencv2
    I coded FaceCropped using cv2 and it works! I want to put img through facecropped method in ProcessedImageField model. Is ... -put-only-the-face-in-the-picture-field-using-opencv2...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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2.1k views
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opencv - Looking for cv_bridge example in C++ for ROS2
    I have been trying to find some sample codes in C++ to gain insight on how to use cv_bridge for ROS2 however ... com/questions/65935364/looking-for-cv-bridge-example-in-c-for-ros2...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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opencv - How can I improve Watershed segmentation of heterogenous structures in Python?
    I'm following a simple approach to segment cells (microscopy images) using the Watershed algorithm in ... i-improve-watershed-segmentation-of-heterogenous-structures-in-python...
asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)
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