How to recognize histograms with a specific shape in opencv / python

Question

I want to segment images (from magazines) in text and image parts. I have several histograms for several ROIs in my picture. I use opencv with python (cv2).

I want to re

Answer 1

You can use a simple correlation metric.

• make sure that the histogram you compute and your reference are normalized (ie represent probapilities)

• for each histogram compute (given that myRef and myHist are numpy arrays):

  metric = (myRef * myHist).sum()

• this metric is a measure of how much the histogram looks like your reference.