BAC1107  DIGITAL PHOTOGRAPHY AND VIDEO EDITING.

UNIVERSITY EXAMINATIONS: 2018/2019
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
APPLIED COMPUTING
BAC1107 DIGITAL PHOTOGRAPHY AND VIDEO EDITING
FULL TIME/PART TIME
DATE: DECEMBER, 2018 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.

QUESTION ONE –COMPULSORY (30 MARKS)
a) i) Define audio editing ( 2 Marks)
ii) What are the challenges of non-linear video editing? (4 Marks)
b) What are the two main disadvantages of the sound effects in video production?
(4 Marks)
c) An audio file occupies 7680KB. If its recorded at (44.1khz, 16 bit and stereo). What is
the duration in minutes (4 Marks)
d) Most of the time sound is represented graphically as a wave. Explain what is meant by
i) The wavelength (2 Marks)
ii) The quantization (2 Marks)
e) What do the following acronyms mean.
i) IEEE
ii) HDMI
iii) PAL
iv) SECAM (4 Marks)
f) Distinguish between transitions and credits (4 Marks)
g) State the Nyquist sampling theorem (2 Marks)
h) Why are standards important in video capturing? (2 Marks)
QUESTION TWO
a) A video file of a size 6000 GB , colour depth of 24 bits, duration of 3 hours, and frame
rate of 30fps, takes 3 hours to download using a bandwidth of 100MBps.
Calculate
i) the pixel count of the camera in megapixels (8 Marks)
ii) the resolution, if the aspect ratio is 4:3 (2 Marks)
iii) the bandwidth requirements, if 200 users are to download the same video for 2hrs
concurrently (2 Marks)
iv) cost of the bandwidth in a) if the cost of 128KBps is Kshs 5,000 (4 Marks)
b) Recommend a suitable method to enable your target audience to view the video
(4 Marks)
QUESTION THREE
a) Define a pixel (1 Mark)
b) Camera has a resolution of 7150×5900. If the size of the graphical images created is
50MB.
Calculate
i) Pixel count (2 Marks)
ii) Colour depth (2 Marks)
iii) Number of colours that can be displayed (2 Marks)
iv) Aspect ratio (2 Marks)
c) If the storage space is 16GB for the camera in b) and that it can take 250 pictures,
what is the compression ratio for the algorithm used (2 Marks)
d) State Four advantages of using JPEG format over BMP format in photo editing
(4 Marks)
e) State FIVE features found in film cameras that cannot be challenged by digital
cameras (5 Marks)
QUESTION FOUR
a) State the challenges that are experienced in aerial photography (6 Marks)
b) Using run length coding, encode the following binary data
1000000000000010000000001000000000110000000001
(6 Marks)
C) Using Huffman encoding algorithm for a data file that has the following characters
Character A B C D E F
Frequency 20 6 12 4 10 15
i) Draw the Huffman tree and code (6 Marks)
ii) encode FABEDC (2 Marks)
QUESTION FIVE
a) State FIVE considerations in producing a professional documentary? (5 Marks)
b) State four factors that are essential in video recording (5 Marks)
c) What is the size of uncompressed stereo sound with CD quality for 10 minute of audio :
(4 Marks)
d) Using LZ coding encode the following text
ABBBBBAMMMNABCBAABBM (6 Marks)

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