2enhan - 3. Image Enhancement Chapter 3 (Image Enhancement...

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1 3. Image Enhancement Chapter 3 (Image Enhancement in the Spatial Domain) • Section 6.3 (Pseudocolor Image Processing)
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2 Gray Level Transformations : Negative : Negative Image Negative: reverse the brightness from “black” to “white”. Useful in displaying medical images. L-1 L-1 s T(r) r 0
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3 Gray Level Transformations: Contrast Stretching It is normally controlled by a piecewise “linear transformation ”. A special case is the “thresholding” when r1=r2 and s1=0, s2=L-1.
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4 Gray Level Transformations: Dynamic Range Compression Processing images exceeding the display capability s = c log(1+ |r|) s=T(r)
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5 Image Enhancement by Gray Level Transformations
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6 Gray Level Transformations: Power-Law Transforms
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7 Gray Level Transformations: Power-Law Transforms
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8 Gamma Correction 0.4 sr
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9 Tonal Tonal Corrections Corrections for flat, light, for flat, light, and dark and dark RGB color RGB color images images
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10 CMYK Color System CMYK Color System Cyan (255,0,0), Magenta (0,255,0), Yellow (0,0,255), Red (0,255,255), Green (255,0,255), Blue (255,255,0), etc. A subtractive system used by printers for the rendering of colors with ink. By depositing three color pigments on white papers (such as ink-jet printers), each absorbs its complementary light color, i.e., cyan absorbs red, magenta absorbs green, and yellow absorbs blue. By increasing yellow ink, the blue decreases. A practical variant, CMYK (with K standing for “black”), is spawned to provide an inexpensive ink. It is called 4-color printing.
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11 CMYK Color System CMYK Color System C M Y R G B = 1 1 1 cyan magenta yellow (for color printers) - (assume all color values have been normalized to the range [0,1]) K
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12 Color Color Balancing Balancing Corrections Corrections for CMYK for CMYK Color Color Images Images
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13 Point Processing: Gray-Level Slicing a) display a “high value” for gray levels of
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2enhan - 3. Image Enhancement Chapter 3 (Image Enhancement...

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