Image Processing Reference
In-Depth Information
Fig. 4.7 Examples of logarithmic and exponential gray-level mappings. Logarithmic mapping is
useful for bringing out details in dark images and exponential mapping is useful for bringing out
details in bright images
4.3
The Image Histogram
So now we know how to correct images using gray-level mapping, but how can we
tell if an image is too dark or too bright?
The obvious answer is that we can simply look at the image. But we would like
a more objective way of answering this question. Moreover, we are also interested
in a method enabling a computer to automatically assess whether an image is too
Search WWH ::




Custom Search