opencv « numpy « Python Data Type Q&A

1. Apply opencv threshold to a numpy array    stackoverflow.com

I'm trying to apply opencv's Threshold function to a numpy array. I'm using the python bindings for opencv 2.1. It goes like this:

import cv
import numpy as np
a = np.random.rand(1024,768)
cv.Threshold(a,a,0.5,1,cv.CV_THRESH_BINARY)

2. How to convert a numpy array view to opencv matrix?    stackoverflow.com

I'm using opencv v2.2 to do some template matching on ndarrays, and I had great trouble with memory leaks when using their wrapped method cv.fromarray(). Rather than plug the memory ...

3. How to convert CvMat to Numpy array?    stackoverflow.com

Looking to convert a CvMat to numpy array.

4. Converting Numpy Array to OpenCV Array    stackoverflow.com

I'm trying to convert a 2D Numpy array, representing a black-and-white image, into a 3-channel OpenCV array (i.e. an RGB image). Based on code samples and the docs ...

5. Creating greyscale video using Python, OpenCV, and numpy arrays    stackoverflow.com

I am using 32-bit python with OpenCV 2.3.1. I am trying to write 2-dimensional numpy arrays to a opencv video writer. My code is similar to :

import cv2 as ...

6. Flatten OpenCV/Numpy Array    stackoverflow.com

I've loaded an RGB image with PIL/OpenCV, and I'd like convert all its channels into a single 1x(3*width*height) sequence into order to feed it to an ANN. I found I can ...

7. how to convert an RGB image to numpy array?    stackoverflow.com

I have an RGB image. I want to convert it to numpy array. I did the following

im = cv.LoadImage("abc.tiff")
a = numpy.asarray(im)

8. Indexing into channel data (numpy arrays) using OpenCV python bindings    stackoverflow.com

I am trying to do a channel compare on two numpy arrays generated from the OpenCV (2.3.1) Python bindings. So, I have a mask (array/image/channel) of shape (x, y) that I ...