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Course: ECE 445, Fall 2009School: UWO
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/ ECE445 MBP409 / ES551 / BME509 / MBP509 Winter 2008 Page 1/1 INTRODUCTION TO DIGITAL IMAGE PROCESSING ASSIGNMENT 4 Due date: Wednesday, March 26, 2008 at end of class Total marks: 5 Late penalty: mark per day overdue. Late assignments will not be accepted after Friday, March 28, 2008, and a mark of zero will be given. If submitting late, please slide the assignment under my door in Medical Sciences Building,...
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/ ECE445 MBP409 / ES551 / BME509 / MBP509 Winter 2008 Page 1/1
INTRODUCTION TO DIGITAL IMAGE PROCESSING ASSIGNMENT 4
Due date: Wednesday, March 26, 2008 at end of class Total marks: 5 Late penalty: mark per day overdue. Late assignments will not be accepted after Friday, March 28, 2008, and a mark of zero will be given. If submitting late, please slide the assignment under my door in Medical Sciences Building, Room M403. All assignments will be done in pairs, and the same final mark for the assignment will be assigned to both partners. CONVENTIONS Fixed-point font (Courier) is used to denote MATLAB commands, variables and filenames. OBJECTIVES To implement a MATLAB function for convolving an image with a convolution kernel assuming that the image processing toolbox is not available to you. TASKS [5 marks] Implement a function in MATLAB called myconv2 for convolving a uint8 image im with an N x N convolution kernel, G, which is of type double. Assume N > 1 and that N is odd. Your function should handle boundaries in the same manner as the valid option in MATLAB. Your function header should be: function im2 = myconv2(im, G) The output im2 is of type double, but gray-level in values im2 do not have to be in the range [0, 1]. The only features of MATLAB that you are allowed to use are the commands function, rot90, forend, size and floor as well as indexing, arithmetic and casting operations. Do not use any commands in the image processing toolbox. Save the function in a file called myconv2.m, and send it to the teaching assistant (bbwheele@uwo.ca) as an email attachment. In the body of the e-mail, list the student numbers and names of group members as they appear with the registrar (i.e., no nicknames). Include a printout of the code in your report. NOTE: Use the exact filename and function name as specified above. All letters are in lowercase. Your function should be commented. REPORT Your report should only consist of a printout of your code. On the front page, list the names of group members as they appear with the registrar and include student numbers; do not use nicknames. Each group should only submit one report. MATLAB RESOURCES All MATLAB guides can be found at: http://www.mathworks.com/access/helpdesk/help/helpdesk.shtml For information on the image processing toolbox, select the link labelled Image Processing Toolbox.
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UWO - ECE - 445
function im2 = blpf(im, D0)%MYFILT Applies Butterworth lowpass filter of order 2 with% cutoff frequency D0 to an image.%%im2 = blpf(im, D0) where im is the input image matrix, D0 is the cutoff%frequency and im2 is the output image. NOTE:
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% Commands typed at MATLAB prompt for Question 2% Read in and display original imageim=imread('pout.tif');subplot(221)imshow(im)title('Original', 'fontsize', 12, 'fontweight', 'bold')% Part (a) Translationstrans = [1 0 0; 0 1 0; 20 -17 1];t
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function [im2, a] = level( fname )%LEVEL Does background removal from an image of type uint8.%%[im2, a] = level(fname) where fname is a string representing% the filename of the image (e.g., 'rice.png'), im2 (uint8) is the% image after backgroun
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