Recent questions tagged OpenCV

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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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858 views

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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...