7.3 Filtering
Filtering removes noise from an image. In this section, we’ll introduce the concept behind filtering and show you some common techniques.
The Principles of Filtering
Noise occurs in images for several reasons:
The photograph was taken in poor conditions; there was not enough light, as in Figure 7-47, or the photographer moved, as in Figure 7-48.
Figure 7-46. The result of applying bizarre curves to all channels
Figure 7-47. Noise due to poor conditions
Figure 7-48. Noise because the photographer moved
The camera was a very low-cost model with ...
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