Manual of image processing lab
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This document contains the answers to questions assigned as part of a lab exercise in computer graphics and image processing. It includes code snippets applying various image filters like Sobel, Prewitt, Gaussian, median, average, Laplacian, and low pass filters. It also applies filters to detect horizontal and vertical edges using the Prewitt filter. Each code sample loads an image, applies a filter, and displays the output. The document provides a complete practice and documentation of the image processing tasks performed for the assignment.
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Assignment of Computer Graphics & Image Processing (Lab)
Question # 9
Sobel Operators
Answer
Command: img =imread('E:hello.jpg','jpg');
figure(1),imshow(img);
filter1=[-1 -2 -1;0 0 0;1 2 1];
filter2=[-1 0 1;-2 0 2;-1 0 1];
res1=imfilter(img,filter1);
figure(2),imshow(res1);
res2=imfilter(img,filter2);
figure(3),imshow(res2);
figure(4),imshow(res1+res2);
Output:](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-2-320.jpg)
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Question # 10
Prewitt Operators
Answer
Command: img=imread('E:hello.jpg','jpg');
figure(1),imshow(img);
filter1=[-1 -1 -1;0 0 0;1 1 1]
filter2=[-1 0 1;-1 0 1;-1 0 1]
res1=imfilter(img,filter1);
figure(2),imshow(res1);
res2=imfilter(img,filter2);
figure(3),imshow(res2);
figure(4),imshow(res1+res2);
Output:](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-3-320.jpg)
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Question # 11
Guassian Filter
Answer
Command: img=imread('E:hello.jpg','jpg');
figure(1),imshow(img);
filter1=fspecial('gaussian',[7 7],2)
res=imfilter(img,filter1);
figure(2),imshow(res)
Output:](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-4-320.jpg)
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Question # 12
Median Filter
Answer
Command: img=imread('E:hello.jpg','jpg');
figure(1),imshow(img);
res=imnoise(img,'salt & pepper',0.01);
figure(2),imshow(res)
figure(3),imshow(medfilt2(temp));
Output:
Question # 13
Average Filter
Answer
Command: img=imread('E:hello.jpg','jpg');
figure(1),imshow(img);
temp1=fspecial('average',[7 7]);
figure(2),imshow(imfilter(img,temp1));](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-5-320.jpg)
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Question # 15
Robert Opertor
Answer
Command: img=imread('E:hello.jpg','jpg');
figure(1),imshow(img);
temp1=[-1 0;0 -1];
temp2=[0 1;-1 0];
res1=imfilter(img,temp1);
figure(2),imshow(res1);
res2=imfilter(img,temp2);
figure(3),imshow(res2);
figure(4),imshow(res1+res2);
Output:
Q 16: Low Pass Filter](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-7-320.jpg)
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Thisfilterisusedforsmoothinginfrequencydomain.
Code:
img=imread('E:hello.jpg','jpg');
img1=rgb2gray(img);
filt=[11 1
1 1 1
1 1 1]/9
image=imfilter(img1,filt);
filtered_img=img1-image;
subplot(1,2,1),imshow(img1);title('Orignal Image');
subplot(1,2,2),imshow(filtered_img);title('LowPassFilter');
Q 17: HighPass Filter
Code:
img=imread('E:hello.png','png');
img1=rgb2gray(img);](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-8-320.jpg)
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filt=[11 1
1 1 1
1 1 1]/9;
image=imfilter(img1,filt);
filtered_img=2*img1-image;
subplot(1,2,1),imshow(img1);title('Orignal Image');
subplot(1,2,2),imshow(filtered_img);title('After ApplyingHighPassFilter');
Q 18: HighBoost Filter
Code:
img=imread('E:hello.jpg,',jpg');
img1=rgb2gray(img);
filt=[11 1
1 1 1
1 1 1]/9;
image=imfilter(img1,filt);](https://image.slidesharecdn.com/manual-171028183412/85/Manual-of-image-processing-lab-9-320.jpg)
Manual of image processing lab
- 1. COMPUTER GRAPHICS AND IMAGE PROCESSING Assignment of Lab Abstract A complete practiceand a well-defined documentation of the tasks thatare to be performed as an assignment Name: M AMIR FAROOQ RegistrationNo. 2014-CS-03 Submitted To: MAM URSOOSA
- 2. 1 Assignment of Computer Graphics & Image Processing (Lab) Question # 9 Sobel Operators Answer Command: img =imread('E:hello.jpg','jpg'); figure(1),imshow(img); filter1=[-1 -2 -1;0 0 0;1 2 1]; filter2=[-1 0 1;-2 0 2;-1 0 1]; res1=imfilter(img,filter1); figure(2),imshow(res1); res2=imfilter(img,filter2); figure(3),imshow(res2); figure(4),imshow(res1+res2); Output:
- 3. 2 Question # 10 Prewitt Operators Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); filter1=[-1 -1 -1;0 0 0;1 1 1] filter2=[-1 0 1;-1 0 1;-1 0 1] res1=imfilter(img,filter1); figure(2),imshow(res1); res2=imfilter(img,filter2); figure(3),imshow(res2); figure(4),imshow(res1+res2); Output:
- 4. 3 Question # 11 Guassian Filter Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); filter1=fspecial('gaussian',[7 7],2) res=imfilter(img,filter1); figure(2),imshow(res) Output:
- 5. 4 Question # 12 Median Filter Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); res=imnoise(img,'salt & pepper',0.01); figure(2),imshow(res) figure(3),imshow(medfilt2(temp)); Output: Question # 13 Average Filter Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); temp1=fspecial('average',[7 7]); figure(2),imshow(imfilter(img,temp1));
- 6. 5 Output: Question # 14 Laplacian Filter Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); a=fspecial('laplacian'); figure(2),imshow(imfilter(img,a)); Output:
- 7. 6 Question # 15 Robert Opertor Answer Command: img=imread('E:hello.jpg','jpg'); figure(1),imshow(img); temp1=[-1 0;0 -1]; temp2=[0 1;-1 0]; res1=imfilter(img,temp1); figure(2),imshow(res1); res2=imfilter(img,temp2); figure(3),imshow(res2); figure(4),imshow(res1+res2); Output: Q 16: Low Pass Filter
- 8. 7 Thisfilterisusedforsmoothinginfrequencydomain. Code: img=imread('E:hello.jpg','jpg'); img1=rgb2gray(img); filt=[11 1 1 1 1 1 1 1]/9 image=imfilter(img1,filt); filtered_img=img1-image; subplot(1,2,1),imshow(img1);title('Orignal Image'); subplot(1,2,2),imshow(filtered_img);title('LowPassFilter'); Q 17: HighPass Filter Code: img=imread('E:hello.png','png'); img1=rgb2gray(img);
- 9. 8 filt=[11 1 1 1 1 1 1 1]/9; image=imfilter(img1,filt); filtered_img=2*img1-image; subplot(1,2,1),imshow(img1);title('Orignal Image'); subplot(1,2,2),imshow(filtered_img);title('After ApplyingHighPassFilter'); Q 18: HighBoost Filter Code: img=imread('E:hello.jpg,',jpg'); img1=rgb2gray(img); filt=[11 1 1 1 1 1 1 1]/9; image=imfilter(img1,filt);
- 10. 9 filtered_img=2*img1-image; subplot(1,2,1),imshow(b);title('OrignalImage'); subplot(1,2,2),imshow(filtered_img);title('HighBoostImage'); Q 19: Horizental and Vertical Edges Using Prewitt Filter Code: img=imread('C:UsersAppleDesktop1','jpg'); img1=rgb2gray(img); edges_of_image=edge(img1,'prewitt'); subplot(1,2,1) imshow(img1);title('Orignal Image'); subplot(1,2,2),