tailieunhanh - CS 450: Level operations - Part 1

CS 450: Level operations - Part 1 includes point processing; adding a constant; amplification, linear level operators; negative; thresholding; quantization; logarithm; exponential; contrast enhancement;. | CS 450 Level Operations - Part 1 1 Point Processing I Simplest kind of enhancement point operations. Process each point independently of the others. All you can do is remap the sample s value b f b where b is the value at the point in question b is the new value in the processed result f is a level operation CS 450 Level Operations - Part 1 2 Adding a Constant Simplest level operation f b b c for some constant c. c 0 Brighter Image c 0 Darker Image CS 450 Level Operations - Part 1 3 Amplification Gain I Another simple level operation is amplification multiplication f b ab where b is the input signal level a is the amplification gain a 1 amplifies the signal louder more constrast a 1 diminishes it softer less contrast

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