Display an image with pixel values shown numerically

Question

I'm looking for OpenCV or other Python function that displays a NumPy array as an image like this:

Referenced from this tutorial.

• What function creates this kind of grey-scale image with pixel values display?
• Is there a color image equivalent?

MATLAB has a function called showPixelValues().

Answer 1

The best way to do this is to search "heat map" or "confusion matrix" rather than image, then there are two good options:

1. Using matplotlib only, with imshow() and text() as building blocks the solution is actually not that hard, and here are some examples.

2. Using seaborn which is a data visualisation package and the solution is essentially a one-liner using seaborn.heatmap() as shown in these examples.

My problem was really tunnel vision, coming at it from an image processing mindset, and not thinking about what other communities have a need to display the same thing even if they call it by a different name.