For a local enhancement using mean and variance, there is one condition: σs(x, y) ≤ k2DG, where, MDG is global standard deviation, k2 a positive constant and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its values is less than 1.0?

Question

For a local enhancement using mean and variance, there is one condition:

Answer 1

For a local enhancement using mean and variance, the condition is that the local variance should be greater than a certain threshold. This ensures that there is enough contrast or variation in the local region, making it suitable for enhancement. If the local variance is too low, the enhancement may not effectively improve the image details, as the area would lack sufficient contrast.