An Image Enhancement Method Using the Quantum-Behaved Particle Swarm Optimization with an Adaptive Strategy

Figure 3

The image “frog” and its histogram equalization image, as well as their grayscale histograms.

(a) Original image “frog”

(b) The rayscale histogram of “frog”

(c) The “frog” after histogram equalization

(d) The grayscale histogram of the “frog” in (c)