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SunYufei
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Update: 2019/12/29
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‎Extra/15 Final Exam with Answer.pdf

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‎Extra/15 Final Exam.pdf

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‎Extra/15 Final Exam/Final Exam with Answer.ipynb

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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Show the difference between the two smoothed images.\n",
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"\n",
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"Note the numeric type of the variable."
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"### Show the 1st channel of difference between the two smoothed images."
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]
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},
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{
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"diff = imsubtract(new_hsi, new_rgb);\n",
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"% diff = new_rgb - new_hsi; % also right\n",
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"% diff = new_hsi - new_rgb; % also right\n",
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"figure, imshow(diff(:, :, 1));"
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"figure, imshow(diff(:, :, 1));\n",
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"% figure, imshow(diff(:, :, 1), []); % also right"
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]
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},
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{

‎Extra/Final Exam.pdf

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‎Students' Code/BK2017070.m

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x = 0:10;
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y = x;
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plot(x, y)
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f = imread('lenna.tif');
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figure, imshow(f);
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r = f(:, :, 1);
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g = f(:, :, 2);
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b = f(:, :, 3);
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figure
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subplot(131), imshow(r), title('Red');
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subplot(132), imshow(g), title('Green');
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subplot(133), imshow(b), title('Blue');
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hsi = rgb2hsi(f);
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h = hsi(:, :, 1);
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s = hsi(:, :, 2);
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i = hsi(:, :, 3);
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figure,
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subplot(131), imshow(h), title('hue');
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subplot(132), imshow(s), title('saturation');
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subplot(133), imshow(i), title('Intensity');
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p = fspecial('average', [5 5]);
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t = imfilter(r, p);
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figure, imshow(t);
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p = fspecial('average', [5 5]);
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e = imfilter(g, p);
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figure, imshow(e);
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p = fspecial('average', [5 5]);
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t = imfilter(b, p);
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figure, imshow(t);
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p = fspecial('average', [5 5]);
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d = imfilter(i, p);
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figure, imshow(d);
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t = -5:5;
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x=0;
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for k = 1:20
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x = x+1/k * (sin((k*pi)/2))*(cos((k*pi*t)/2));
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end
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plot(t, x);
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title('Daniye')
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‎Students' Code/BK2017072.m

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f = imread('lenna.tif');
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imshow(f);
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r = f(:, :, 1);
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g = f(:, :, 2);
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b = f(:, :, 3);
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figure
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subplot(131), imshow(r), title('Red');
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subplot(132), imshow(g), title('Green');
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subplot(133), imshow(b), title('Blue');
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hsi = rgb2hsi(f);
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h = hsi(:, :, 1);
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s = hsi(:, :, 2);
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i = hsi(:, :, 3);
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figure
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subplot(131), imshow(h), title('Hue');
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subplot(132), imshow(s), title('Saturation');
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subplot(133), imshow(i), title('Intensity');
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r1 = fspecial('average',[5 5]);
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r2 = imfilter(r, r1);
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g1 = fspecial('average',[5 5]);
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g2 = imfilter(g, r1);
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b1 = fspecial('average',[5 5]);
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b2 = imfilter(b, r1);
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rgbfinal = cat(3, r2, g2, b2);
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figure, imshow(rgbfinal);
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i1 = fspecial('average',[5 5]);
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i2 = imfilter(i, i1);
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hsifinal = cat(3, h, s, i2);
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%figure, imshow(hsifinal);
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convertToRGB = hsi2rgb(hsifinal);
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figure, imshow(convertToRGB);
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%diff = rgbfinal - convert2RGB;
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%figure, imshow(diff);
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%k = 1:20;
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%t = -5:5;
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%a = (1 * k.^-1);
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%b = (k * pi)* (1 * 2.^-1);
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%x = a * sin(b);
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%plot(x, t), title('Greatfortune Mamhova'), legend('x(t)'), xlabel('t'), ylabel('x');
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‎Students' Code/BK2017073.m

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%Question one
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f = imread('lenna.tif');
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figure,imshow(f);
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%question two
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r = f(:,:,1);
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g = f(:,:,2);
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b = f(:,:,3);
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figure
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subplot(131),imshow(r),title('Red');
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subplot(132),imshow(g),title('Green');
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subplot(133),imshow(b),title('Blue');
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%question three
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hsi = rgb2hsi(f);
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h = hsi(:,:,1);
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s = hsi(:,:,2);
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i = hsi(:,:,3);
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figure
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subplot(131),imshow(h),title('Hue');
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subplot(132),imshow(s),title('Saturation');
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subplot(133),imshow(i),title('Intensity');
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%question four
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smoothing = fspecial('average',[5 5]);
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rsmooth = imfilter(r,smoothing);
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gsmooth = imfilter(g,smoothing);
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bsmooth = imfilter(b,smoothing);
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rgb_smooth = cat(3,rsmooth,gsmooth,bsmooth);
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figure,imshow(rgb_smooth);
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%question five A
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ismooth = imfilter(i,smoothing);
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hsi_rgb_smooth = cat(3,h,s,ismooth);
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rgb = hsi2rgb(hsi_rgb_smooth);
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figure,imshow(rgb);
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%question five B
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%minus = rgb_smooth - rgb;
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%fc = minus(:,:,1);
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%figure,imshow(fc);
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%question six
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t = -5:5;
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x = 0;
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p = pi/2;
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c = pi*t/2;
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for k =1:20
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x = x + ((1/k)*(sin(p*k)) * cos((c*k)));
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end
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figure
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plot(t,x)
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title('Austin Madangwa BK2017073')
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xlabel('t')
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ylabel('x')
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legend('x = x(t)')

‎Students' Code/BK2017074.m

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%show original image
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f=imread('lenna.tif');
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figure,imshow('lenna.tif');
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% RGB color
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r = f(:, :, 1);
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g = f(:, :, 2);
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b = f(:, :, 3);
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figure
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subplot(131), imshow(r), title('Red');
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subplot(132), imshow(g), title('Green');
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subplot(133), imshow(b), title('Blue');
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% Question 3 HSI
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hsi = rgb2hsi(f);
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h = hsi(:, :, 1);
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s = hsi(:, :, 2);
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i = hsi(:, :, 3);
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figure
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subplot(131), imshow(h), title('Hue');
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subplot(132), imshow(s), title('Saturation');
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subplot(133), imshow(i), title('Intensity');
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% Question 4
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r1=fspecial('average',[5 5]);
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red=imfilter(r,r1);
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%imshow(red);
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g1=fspecial('average',[5 5]);
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green=imfilter(g,g1);
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%imshow(green);
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b1=fspecial('average',[5 5]);
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blue=imfilter(b,b1);
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%imshow(blue);
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rgb=cat(3,red,blue,green);
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figure,imshow(rgb);
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%Question 5
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h1=fspecial('average',[5 5]);
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hue=imfilter(h,h1);
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%imshow(hue);
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s1=fspecial('average',[5 5]);
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saturation=imfilter(s,s1);
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%imshow(saturation);
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i1=fspecial('average',[5 5]);
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intensity=imfilter(i,i1);
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%imshow(intensity);
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hsi=cat(3,hue,saturation,intensity);
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figure,imshow(hsi);
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%graph
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k = 1:20;
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t = -5:5;
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a = (1 * k.^-1);
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b = (k * pi)* (1 * 2.^-1);
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x = a * sin(b);
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plot(x, t), title('Evans Muchinguri'), legend('x(t)'), xlabel('t'), ylabel('x');
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‎Students' Code/BK2017075.m

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f=imread('lenna.tif');
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imshow(f);
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r= f(:, :, 1);
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g= f(:, :, 2);
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b= f(:, :, 3);
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figure
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subplot(131), imshow(r), title('Red');
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subplot(132), imshow(g), title('Green');
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subplot(133), imshow(b), title('Blue');
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hsi= rgb2hsi(f);
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h= hsi(:, :, 1);
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s= hsi(:, :, 2);
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i= hsi(:, :, 3);
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figure
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subplot(131), imshow(h), title('Hue');
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subplot(132), imshow(s), title('Saturation');
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subplot(133), imshow(i), title('Intensity');
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r5= fspecial('average', [5 5]);
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rr5= imfilter(r, r5);
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figure, imshow(rr5);
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g5= fspecial('average', [5 5]);
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gg5= imfilter(g, g5);
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figure, imshow(gg5);
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b5= fspecial('average', [5 5]);
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bb5= imfilter(b, b5);
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figure, imshow(bb5);
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rgb= cat(3, rr5, gg5, bb5);
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figure, imshow(rgb);
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i5= fspecial('average', [5 5]);
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ii5= imfilter(i, i5);
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figure, imshow(ii5);
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Hrgb= cat(3, h, s, ii5);
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figure, imshow(Hrgb);
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hsiZ= hsi2rgb(Hrgb);
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figure, imshow(hsiZ);
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rgb= tofloat(rgb);
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hsiZ= tofloat(hsiZ);
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s= rgb - hsiZ;
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figure, imshow(imcomplement(s), []);
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t= -5:5;
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y= (1/k)*sin(k)
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