Image Enhancement - Nubacad.com

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Log Gray-level Transform • s = T(r) = c log(1+r) • expand dark value to enhance details of dark area (a) Fourier spectrum and (b) Result of applying Log transform. May 07, 2011 Dr. Al-Amin http://www.geocities.com/alamin_bhuiyan 6
Piece-wise Linear Gray-level Transform • Allow more control on the complexity of T(r). – Contrast stretching – Gray-level slicing – Bit-plane slicing Contrast stretching Low contrast images can result poor illumination, lack of dynamic range in the imaging sensor, or even wrong setting of imaging aperture during image acquisition. The idea behind contrast stretching is to increase the dynamic range of the gray levels in the image behind process. May 07, 2011 Dr. Al-Amin http://www.geocities.com/alamin_bhuiyan 7
Page 1 and 2: Image Enhancement Modify color or g
Page 3 and 4: Gray Level Transformation Function:
Page 5: Image Negatives • s = T(r) = L-1-
Page 9 and 10: Gray-level Slicing Provides a binar
Page 11 and 12: Histogram • The histogram of an i
Page 13 and 14: Histogram Equalization Redistributi
Page 15 and 16: Histogram Equalization … May 07,
Page 17 and 18: Enhancing using Arithmetic/Logic Op
Page 19 and 20: Image Subtraction Subtraction of tw

Image Enhancement - Nubacad.com

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