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2.4 Assignment Solutions - Lecure 2
2.4.1 Part A
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Load and Display:
blackrect = imread('blackrectangle.bmp');
image(blackrect);
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Figure 2.26
Click to enlarge
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Red Layer:
subimageR = blackrect(558:643,622:703,1);
image(subimageR);
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Figure 2.27
Click to enlarge
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Green Layer:
subimageG = blackrect(558:643,622:703,2);
image(subimageG);
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Figure 2.28
Click to enlarge
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Blue Layer:
subimageB = blackrect(558:643,622:703,3);
image(subimageB);
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Figure 2.29
Click to enlarge
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Extract vectors and perform arithmetic operations:
vectorA = double(subimageB(13:80,24));
vectorB = double(subimageB(13:80,45));
vectorC = double(subimageB(13:80,46));
a=vectorA.^vectorB;
a=a.*vectorB;
a=a+vectorC;
a=a+32;
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Figure 2.30
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Display results:
char(a)
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Figure 2.31
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Transpose and display for better readability:
char(a')
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Figure 2.32
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2.4.2 Part B
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Beep waveform:
s=sin([0:0.4:pi*150]);
wavplay(s, 8000);
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Figure 2.33
Click to enlarge
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Load "
authoritah.wav" and extract word "authoritah":
authoritah = wavread('authoritah.wav');
newauthoritah = authoritah;
wordAuthoritah = authoritah(9800:length(authoritah));
l=length(wordAuthoritah)
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Figure 2.34
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Compute length of beep waveform and verify matching lengths:
x=l*0.4/pi
s=sin([0.4:0.4:pi*x]);
length(wordAuthoritah)
length(s)
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Figure 2.35
Click to enlarge
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Replace word "
authoritah" in original waveform, playback, and plot:
newauthoritah(9800: length(newauthoritah)) = s;
wavplay(newauthoritah, 8000);
plot(newauthoritah);
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Figure 2.36
Click to enlarge
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2.4.3 Part C
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