如何在python中使用opencv在图像上显示轴

Question

Is there a way to show the row and column axes when displaying an image with cv2.imshow()? I am using the python bindings for opencv3.0

Answer 1

Not that I am aware of.

However, since you are using Python you are not constrained to use the rudimentary plotting capabilities of OpenCV HighGUI.

Instead, you can use the much more competent matplotlib library (or any of the other available Python plotting libraries).

To plot an image, including a default axis you do

import matplotlib.pyplot as plt
plt.imshow(image, interpolation='none') # Plot the image, turn off interpolation
plt.show() # Show the image window

Answer 2

I'm not sure I fully understand the question due to lack of info.

However you can use OpenCV's draw line function to draw a line from the example points (10,10) to (10,190), and another from (10,190) to (190,190)

On an example image that is 200X200 pixels in size, this will draw a line down the left hand side of the image, and a line along the bottom. You can then plot numbers or whatever you want along this line at increments of X-pixels.

Drawing text/numbers to an image is similar to drawing a line.

Once you have drawn the image, show with the usual image.imshow().

See OpenCV's drawing documentation here:

http://docs.opencv.org/modules/core/doc/drawing_functions.html

And an example to get you going can be found here:

http://opencvexamples.blogspot.com/2013/10/basic-drawing-examples.html#.VMj-bUesXuM

Hope this helps.