04_sharpenx

04_sharpenx - Sharpening Spatial Filters COMP344 COMP344...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Sharpening Spatial Filters COMP344 COMP344 Sharpening Spatial Filters
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sharpening Objectives of sharpening highlight fine detail in an image enhance detail that has been blurred COMP344 Sharpening Spatial Filters
Background image of page 2
Sharpening. .. We can think of this as high-pass filtering letting high frequencies pass removing low frequencies Frequency domain Spatial domain COMP344 Sharpening Spatial Filters
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Derivative Filters Averaging pixels blur analogous to integration , related to sum of pixel intensity values Differentiation has the opposite effect of blurring sharpens an image, related to difference between intensity values First derivative f x f ( x + 1) - f ( x ) Second derivative 2 f x 2 f ( x + 1) + f ( x - 1) - 2 f ( x ) COMP344 Sharpening Spatial Filters
Background image of page 4
Example COMP344 Sharpening Spatial Filters
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
First Derivative 0 in constant gray segments non-zero at the onset of steps or ramps non-zero along ramps COMP344 Sharpening Spatial Filters
Background image of page 6
0 in constant gray segments
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/24/2010 for the course COMP 344 taught by Professor Albertk.wong during the Fall '09 term at HKUST.

Page1 / 11

04_sharpenx - Sharpening Spatial Filters COMP344 COMP344...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online