ch03a - Ch 3 Intensity Transformations • Overview •...

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Unformatted text preview: Ch 3 - Intensity Transformations • Overview • Linear Map • Inverse Map • Thresholding • Windowing • Log Transformation • Power Law Transformation • Contrast Stretching • Intensity Slicing • Bit Plane Images • Conclusion Overview • Goal is to modify pixel intensity to improve the visibility of objects of interest in an image • General form of operation: For (int y = 0; y < Ydim, y++) For (int x = 0; x < Xdim; x++) Output[y][x] = Map( Input[y][x] ) • Different Map functions give different effects • Slope of curve determines enhancement effect Linear Map • A linear map function is used to compress or stretch the intensity range of pixels in an image • Typically used prior to data storage or display • Map(i) = A * i + B • Example: – Input range [a..b] – Output range [0..255] – Map(i) = 255 * (i – a) / (b – a) Linear Map • When the linear map function has A < 1 the output range is smaller input range • When pixels are stored in integers this results in quantization and loss of information • Example:...
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ch03a - Ch 3 Intensity Transformations • Overview •...

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