Recent questions tagged OpenCV

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opencv - Iterative Closest Point (ICP) implementation on python

I have been searching for an implementation of the ICP algorithm in python lately with no result. According to ... , I missing anything here? 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 - Where can I find haar cascades xml files?

I'm looking for a website to download haar cascades xml files from. It can be for any objects as long as its a properly working cascade. 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 - Python: How to pip install opencv2 with specific version 2.4.9?

I know that I could pip install opencv-python which installs opencv3, but is there a separate command or name ... version to install? Thanks. 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 - How to match texture similarity in images?

What are the ways in which to quantify the texture of a portion of an image? I'm trying to detect ... implementing any of the texture analyses. 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 - Adaptive threshold of blurry image

I have a fairly blurry 432x432 image of a Sudoku puzzle that doesn't adaptively threshold well (take the mean over ... What else should I try? 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 - What does size and response exactly represent in a SURF keypoint?

I'm using OpenCV 2.3 for keypoints detection and matching. But I am a bit confused with the size and ... best one in term of trackability? 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 - How to remove all lines and borders in an image while keeping text programmatically?

I'm trying to extract text from an image using Tesseract OCR. Currently, with this original input image, ... Original Image: Expected Image: 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 - Image preprocessing for text recognition

What's the best set of image preprocessing operations to apply to images for text recognition in EmguCV? I've ... to the OCR engine. Thanks 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 - How to draw a rectangle around a region of interest in python

I'm having trouble with import cv in my python code. My issue is I need to draw a rectangle around regions of ... I've found in the image. 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 - why cv2.imshow() results in error in my python compiler?

Hi friends i just now installed opencv and checking the basic code but it results in error. The code is ... your answer. Thanks in advance 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 - Conda does not install latest available version

On Ubuntu in a Conda environment with Python 3.7.3, when I run conda install -c conda-forge opencv I ... opencv and it got completely removed) 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 - Segmentation problem for tomato leaf images in PlantVillage Dataset

I am trying to do segmentation of leaf images of tomato crops. I want to convert images like following image to following ... a way to do 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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opencv - Can't import import android.hardware.camera2 classes

I imported the opencv android library to my android studio and the Camera2Renderer class has a lot of compiler errors ... can't be imported. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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474 views

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opencv - Convert a folder comprising jpeg images to hdf5

Is there a way to convert a folder comprising .jpeg images to hdf5 in Python? I am trying to build a ... for classification of images. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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688 views

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opencv - Read circular text using OCR

I want to read text on the object. But OCR program can't recognize it. When I give the small part, it can ... . How can I do this? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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opencv - plt.imshow shows color images for grayscale images in IPython

I have the following RGB image imRGB import cv2 import matplotlib.pyplot as plt #Loading the RGB image imRGB = cv2 ... imGray is shown in color? 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 - HoughCircles Parameters to recognise balls

After processing an image by converting it to grey scale and then blurring it, I'm trying to apply a Hough ... created in GIMP it works fine) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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542 views

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opencv - How to know total number of Frame in a file with cv2 in python

How to know total number of Frame in a file ( .avi) through Python using open cv module. If possible what all ... of a video file through this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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890 views

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opencv - How can i fit points to curve using c++?

There a is an ellipse on the picture,just as following. I have got the points of the contour by using opencv. ... into curve like the blue line? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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opencv - Simple method to extract specific color range from an image in Python?

I'm trying to extract a specific color from an image within a defined RGB range using the cv2 module. In the ... 255]]] pixel percentage: 0.0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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669 views

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opencv - how to refine or blur or smooth just the edges?

Is it possible to refine or blur just the edges in an image with the white background ? I was thinking to ... know how to achieve this. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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452 views

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opencv - Cluster texture based on features extracted from Gabor

I'm trying to cluster textures based on the features extracted from Gabor bank that I've created, but the result ... images goes to one folder. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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692 views

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opencv - Speeding up optical flow (createOptFlow_DualTVL1)

I am using createOptFlow_DualTVL1() to calculate optical flow which is giving me exactly what I want but ... Current_Gray_Frame, Optical_Flow); 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 - Difference between cvMat, Mat and IpImage

I'm trying to discover opencv library at the moment, but it seems a bit messy with the data structures. so ... the tutorials page) Many thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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688 views

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opencv - VideoCapture.open(0) won't recognize pi cam

I have been working with my Raspberry Pi 2B for a while now. Testing the Pi cam using raspistill works great but ... . What am I missing here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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887 views

1 answer

opencv - Image is not displaying in Google Colab while using imshow()

I am working on a project which requires functions from OpenCV to plot images. I am trying to display image ... : Link to my Colab Notebook See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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605 views

1 answer

opencv - Inverting a real-valued index grid

OpenCV's remap() uses a real-valued index grid to sample a grid of values from an image using bilinear ... small margin of machine precision. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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629 views

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opencv 3.0.0-dev python bindings not working properly

I am on ubuntu 14.04.02, i have python, cython and numpy installed and updated. i pulled the latest sources of ... what could be wrong with 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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