Questions tagged [opencv]
OpenCV (Open Source Computer Vision) is a library for real time computer vision. When using this tag, please add a language specific tag (python, c++, ...), if relevant.
opencv
73,568
questions
1912
votes
23
answers
242k
views
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
One of the most interesting projects I've worked on in the past couple of years was a project about image processing. The goal was to develop a system to be able to recognize Coca-Cola 'cans' (note ...
- 41.2k
457
votes
26
answers
2.2m
views
Cannot find module cv2 when using OpenCV [duplicate]
I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using this script by jayrambhia. It installed version 2.4.5.
When I try import cv2 in a Python ...
- 4,603
428
votes
3
answers
273k
views
Simple Digit Recognition OCR in OpenCV-Python
I am trying to implement a "Digit Recognition OCR" in OpenCV-Python (cv2). It is just for learning purposes. I would like to learn both KNearest and SVM features in OpenCV.
I have 100 samples (i.e. ...
- 52.5k
415
votes
12
answers
1.0m
views
How to crop an image in OpenCV using Python
How can I crop images, like I've done before in PIL, using OpenCV.
Working example on PIL
im = Image.open('0.png').convert('L')
im = im.crop((1, 1, 98, 33))
im.save('_0.png')
But how I can do it ...
- 4,453
396
votes
10
answers
26k
views
How to detect a Christmas Tree?
Which image processing techniques could be used to implement an application that detects the Christmas trees displayed in the following images?
I'm searching for solutions that are going to work ...
- 93k
318
votes
45
answers
1.0m
views
How do I install Python OpenCV through Conda?
I'm trying to install OpenCV for Python through Anaconda, but I can't seem to figure this out.
I tried
conda install opencv
conda install cv2
I also tried searching
conda search cv
No cigar. I ...
- 19.4k
272
votes
24
answers
920k
views
How do I install opencv using pip?
I need to install cv2 for a script that has been written for me. I tried pip install cv2 and pip install open_cv and got the same problem - a warning message from dist.py and complains about zlib ...
- 2,892
257
votes
14
answers
615k
views
Python - Extracting and Saving Video Frames
So I've followed this tutorial but it doesn't seem to do anything. Simply nothing. It waits a few seconds and closes the program. What is wrong with this code?
import cv2
vidcap = cv2.VideoCapture('...
- 4,153
245
votes
35
answers
668k
views
ImportError: numpy.core.multiarray failed to import
I'm trying to run this program
import cv2
import time
cv.NamedWindow("camera", 1)
capture = cv.CaptureFromCAM(0)
while True:
img = cv.QueryFrame(capture)
cv.ShowImage("camera&...
user3090952
234
votes
9
answers
175k
views
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 value if they contain exactly the same thing but may have some slightly different background and may be ...
- 67.2k
231
votes
12
answers
195k
views
Is there a way to detect if an image is blurry? [closed]
I was wondering if there is a way to determine if an image is blurry or not by analyzing the image data.
- 4,857
223
votes
5
answers
654k
views
How to resize an image with OpenCV2.0 and Python2.6
I want to use OpenCV2.0 and Python2.6 to show resized images. I used and adopted this example but unfortunately, this code is for OpenCV2.1 and does not seem to be working on 2.0. Here my code:
import ...
- 9,725
217
votes
6
answers
47k
views
How to remove convexity defects in a Sudoku square?
I was doing a fun project: Solving a Sudoku from an input image using OpenCV (as in Google goggles etc). And I have completed the task, but at the end I found a little problem for which I came here.
...
- 52.5k
205
votes
6
answers
271k
views
Checking images for similarity with OpenCV
Does OpenCV support the comparison of two images, returning some value (maybe a percentage) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, ...
- 8,801
204
votes
11
answers
927k
views
How to display an image
I tried to use IPython.display with the following code:
from IPython.display import display, Image
display(Image(filename='MyImage.png'))
I also tried to use matplotlib with the following code:
...
- 5,826