Lecture 10

Lecture 10 Figures from Gonzalez and Woods, Digital Image Processing, Second Edition, 2002.

DFT of Laplacian

Chapter 4 Image Enhancement in the Frequency Domain

High Boost Filtering

A picture from the news Before and after Lapacian filter, picture of giant squid by Japanese scientists

The tackiest pictures I could find Original After Laplacian Filter

After High Boost Filter A=1.7 A=1.4

High Frequency Emphasis

Homomorphic Filtering

Properties of the DFT • Translation • Distributivity and scaling • Rotation • Periodicity and conjugate symmetry • Separability • Simplicity of computing inverse

Need for Padding Without padding convolutions will not be properly implemented. f(x) has period A h(x) has period B g(x)= h(x)*f(x) has period P>=A+B-1

Convolution and Correlation

Lecture 10

Lecture 10

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Lecture 10

Lecture 10

Lecture 10

Lecture 10

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Lecture 10

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LECTURE 10

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Lecture 10