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Histograms

A histogram is a graphical representation of the intensity distribution of pixels in an image. It provides valuable insight into the image's tonal range, color balance, and contrast.

Grayscale histogram

For grayscale images, each pixel intensity value ranges from 0 (black) to 255 (white). The histogram shows the number of pixels for each intensity value.

The calcHist function takes these arguments:

cv.calcHist([img], channels, mask, bins, ranges)
  • image list
  • channel list
  • mask
  • the number of bins
  • ranges, typically [0, 255]

histogram1.png

.. literalinclude:: histogram1.py

:download:`histogram1.py<histogram1.py>`

Color histogram

lego.png

Here is the histogram

histogram2.png

.. literalinclude:: histogram2.py

:download:`histogram2.py<histogram2.py>`

Blurring

blur1.png

.. literalinclude:: blur1.py

:download:`blur1.py<blur1.py>`