1. | In a PAL system, determine the values of the three colour primaries R, G and B for the following colours: red, green, blue, yellow, cyan, magenta and white. |
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2. | Calculate the luminance and chrominance values of the colours in problem 1, if they are digitised into eight bits, according to CCIR-601 specification. |
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3. | Calculate the horizontal scanning line frequency for CCIR-601/625 and CCIR-601/525 line systems and hence their periods. |
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4. | CCIR-601/625 video is normally digitised at 13.5 MHz sampling rate. Find the number of pixels per scanning line. If there are 720 pixels in the active part of the horizontal scanning, find the duration of horizontal scanning fly-back (i.e. horizontal blanking interval). |
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5. | Repeat problem 4 for CCIR-601/525. |
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6. | Find the bit rate per second of the following video formats (only active pixels are considered):
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7. | The luminance values of a set of pixels in a CCIR-601 video are: 128; 128; 128; 120; 60; 50; 180; 154; 198; 205; 105; 61; 93; 208; 250; 190; 128; 128; 128. They are filtered and downsampled by 2:1 into SIF format. Find the luminance values of seven SIF samples, starting from the fourth pixel of CCIR-601. |
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8. | The luminance values of the SIF pixels in problem 7 are upsampled and filtered into CCIR-601 format. Find the reconstructed CCIR-601 format pixel values. Calculate the PSNR of the reconstructed samples. |
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9. | A pure sinusoid is linearly quantised into n bits:
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Answers
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2. |
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3. | and | ||||||||||||||||||||||||||||||||
4. | ; 864 - 720 = 144 pixels; | ||||||||||||||||||||||||||||||||
5. | 857 pixels; 857 - 720 = 137 pixels; 10 μs | ||||||||||||||||||||||||||||||||
6. |
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7. | 94 73 194 184 50 204 207 | ||||||||||||||||||||||||||||||||
8. | 94 82 73 132 194 201 184 109 50 121 204 222 207 PSNR = 20.2 dB | ||||||||||||||||||||||||||||||||
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