Question

A specific range of gray-levels highlighting is the basic idea of __________

(a) Contrast stretching

(b) Bit –plane slicing

(c) Thresholding

(d) Gray-level slicing

The question was posed to me during an interview for a job.

My query is from Piecewise-Linear Transformation Functions topic in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right choice is (d) Gray-level slicing

To elaborate: gray-level slicing is being done by two approach: One approach is to give all gray level of a specific range high value and a low value to all other gray levels.

Second approach is to brighten the pixels gray-value of interest and preserve the background.

I.e. in both highlighting of a specific range of gray-level is been done.