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level.slides.printing.6

level.slides.printing.6 - Level Operations(Part 1 Level...

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Level Operations (Part 1) Level Operations (Part 1) CS 450: Introduction to Digital Signal and Image Processing Level Operations (Part 1) Introduction Point Processing Simplest kind of enhancement: point operations. Process each point independently of the others. All you can do is remap the sample’s value: s = T ( r ) where r is the value at the point in question s is the new value in the processed result T is a grey-level transformation or level operation Level Operations (Part 1) Linear Operations Adding a Constant Simplest level operation: s = r + c for some constant c . c > 0 Brighter Image c < 0 Darker Image Level Operations (Part 1) Linear Operations Amplification (Gain) Another simple level operation is amplification (multiplication): s = ar where r 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) Level Operations (Part 1) Linear Operations Linear Level Operators Linear operators combine gain (multiplication) and offset (addition): s = ar + c where a is the gain c is the offset Level Operations (Part 1) Linear Operations
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