UNIVERSITY EXAMINATIONS: 2017/2018
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
APPLIED COMPUTING
BAC1107 DIGITAL PHOTOGRAPHY AND VIDEO EDITING
FULL TIME/PART TIME
DATE: AUGUST, 2018 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.
QUESTION ONE –COMPULSORY (30 MARKS)
a) i) Define video editing (2Marks)
ii) What are the challenges of linear video editing? (4 Marks)
b) What are the two main advantages of the sound tracking in video production?
(4 Marks)
c) An audio file occupies 254 MB. 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 amplitude of the sound
ii) The frequency of the sound (4 Marks)
e) What do the following acronyms mean?
i) DVB
ii) NTSC
iii) ATSC
iv) HDTV (4 Marks)
f) Distinguish between storyboarding and time lining (4 Marks)
g) State the Nyquist sampling theorem (2 Marks)
h) Why some applications need to use MIDI? (2 Marks)
QUESTION TWO (20 MARKS)
a) A video file of a size 19770.56 GB , colour depth of 20 bits, duration of 3 hours, and
frame rate of 30fps, takes 5 hours to download using a bandwidth of 1.1GBps.
Calculate
i) the pixel count of the camera in megapixels (8 Marks)
ii) the resolution, if the aspect ratio is 16:9 (2 Marks)
iii) the bandwidth requirements, if 20 users are to download the same video for 5hrs
concurrently (2 Marks)
iv) cost of the bandwidth in a) if the cost of 128KBps is Kshs 60,000 (4 Marks)
b) Recommend a suitable method to enable your target audience to view the video
(4 Marks)
QUESTION THREE (20 MARKS)
a) Define a pixel (2 Marks)
b) Camera has a resolution of 5120×4850. If the size of the graphical images created is
53.28MB.
Calculate
i) Pixel count (2 Marks)
ii) Colour depth (3 Marks)
iii) Number of colours that can be displayed (2 Marks)
iv) Aspect ratio (2 Marks)
c) If the storage space is 8GB for the camera in b) and that it can take 307 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 digital cameras that edged out the traditional cameras
(5 Marks)
QUESTION FOUR (20 MARKS)
a) State the challenges that are experienced in linear video editing (6 Marks)
b) Using run length coding, encode the following binary data
00000000000000100000000001000000011000000
(6 Marks)
C) Using Huffman encoding algorithm for a data file that has the following characters
Character A B C D E
Frequency 10 16 19 7 20
i)give the Huffman tree and code (6 Marks)
ii) encode ABEBADC (2 Marks)
QUESTION FIVE (20 MARKS)
a) How much memory is required for an 5160 by 4290 display resolution with colour depth
24 bits? (5 Marks)
b) State four factors that are essential in audio digital recording (5 Marks)
c) What is the size of uncompressed stereo sound with CD quality for 3 minute of audio:
(4 Marks)
d) Using LZ coding encode the following text
ABBAMMMNABCBAABBM (6 Marks)
