Peter Bailey
UMN address      bail0253@umn.edu
U of M contact info page



Assignment pdf
Assignment code

Problem 1

Histogram equalization and matching

Problem 1a code
Problem 1b code


Original image


Original histogram


Part A: histogram-equalized image


Equalized histogram


Smoothed equalized histogram


Part B: histogram-matched image


Matched histogram


Smoothed matched histogram



Problem 2

Noise filtering


Problem 2 code
Note: This code uses an implementation of the non-local means filter by Jose Vicente Manjon-Herrera.


Original image


Noisy image 1


Noisy image 2


Part A: 3x3 average 1


Part A: 3x3 average 2


Part A: 7x7 average 1


Part A: 7x7 average 2


Part A: 9x9 gaussian 1


Part A: 9x9 gaussian 2


Part B: 3x3 median 1


Part B: 3x3 median 2


Part B: 7x7 median 1


Part B: 7x7 median 2


Part C: Wiener filter 1


Part C: Wiener filter 2


Part D: non-local means filter 1


Part D: non-local means filter 2


Part E: NLM median filter 1


Part E: NLM median filter 2


Problem 3

Problem 3 code


3x3 mean smoothed, Laplacian-sharpened 1


3x3 mean smoothed, Laplacian-sharpened 2


7x7 mean smoothed, Laplacian-sharpened 1


7x7 mean smoothed, Laplacian-sharpened 2


3x3 median smoothed, Laplacian-sharpened 1


3x3 median smoothed, Laplacian-sharpened 2


7x7 median smoothed, Laplacian-sharpened 1


7x7 median smoothed, Laplacian-sharpened 2


9x9 gaussian smoothed, Laplacian-sharpened 1


9x9 gaussian smoothed, Laplacian-sharpened 2


Non-local means smoothed, Laplacian-sharpened 1


Non-local means smoothed, Laplacian-sharpened 2



Problem 4

Problem 4 code


Original image


Blurred, noisy image


3x3 median-filtered image


Restored, sharpened image


Problem 5

Problem 5 code


Original image


Red edge magnitude


Blue edge magnitude


Green edge magnitude


Vector color edge magnitude


Normalized difference: vector edge magnitude - combined edge magnitude


Problem 6

Problem 6 code


Original image (8 bits per pixel)


Normalized, DM-encoded image 1 (predictor error; 1 bit per pixel)


Decoded image 1


Normalized, DPCM-encoded image 2 (predictor error; 2 bits per pixel)


Decoded image 2




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