Summer 2011 ITEC2110-03 Test 3, Dr. Jim Rowan
Images used in this test are found in the folder named: test3Images.
1) The image named image5.jpg could be best described as an example of what computer
based technique?
2) If an animator wants to make his 3D model move like a human what technique would
be his best choice?
3) Digital TV recently replaced Analog broadcast TV. Give one reason for this change.
4) Tell me something relevant about the fusion rate for humans.
5) What can affect this fusion rate?
6) Video images can be interlaced or progressive scan. Which one can result in the
artifact seen in image1.jpg?
7) What are the specific circumstances under which #6 above can occur?
8) What is the name of the artifact seen in image1.jpg?
9) Looking at image2.jpg and image3.jpg, which one is clearly an example of interlaced
scan?
10) What is an analog connection’s biggest disadvantage over a digital connection?
11) One approach to reducing the size of the video data stream is to save the color
information less frequently than the illumination information. What is this technique
called?
12) Describe the basic problem encountered when converting motion picture film to
video using any of the Telecine processes?
13) One category of video compression compresses each captured frame as a completely
specified image. What is this kind of compression called?
14) Which of the two categories of video compression in its simplest form calculates
frame differences and in its more complex form does vectoring?
15) imageDifferencing.ppt, found in the imageDifferencing folder, is an exercise in
image differencing.
DON’T PANIC!
Everyone gets credit for this question whether or not you actually do it!
but… if you get it right you get 5 extra points
(I suggest you save this for last, if you have the time)
Across the top shows the first two frames of a black and white (that’s why there is only
one value shown for each pixel) video that is to be temporally compressed using
differencing. The first frame is the keyframe so it is spatially compressed and looks just
like the first frame of the video. The second frame is to be created using image
differencing. What would the values be for this temporally compressed image? Simply
list out the 20 values (with commas between them) on your answer sheet.
16) Looking at image4.jpg the frame capture sequence is shown for the three different
forms of mpeg video compression. In the third, most complex compression technique,
what frame(s) are needed before frame 5 can be reconstructed?
17) Looking at image4.jpg which technique uses image differencing alone?
18) Looking at image4.jpg which technique uses spatial compression alone?
19) When generating the frames that fall between the key frames in an animation
sequence, which form of interpolation would more accurately show the motion of an
object under the affect of gravity?
20) What is the difference between an asymmetric codec and a symmetric codec?
21) The choice of the codec used to compress and decompress a video affects that video
in a number of different ways. Give one of these other than video quality.
22) Which two animation techniques do not require the animator to create shadows
individually, frame by frame?
23) In 1937 Walt Disney brought Snow White to the screen using what form of
animation?
24) In the 1960’s Terry Gilliam of Monty Python’s Flying Circus fame introduced the TV
audience to what form of animation?
25) If an animator decides to use 2D computer animation techniques rather than 3D
animation techniques, give one thing that they would have to produce, frame by frame,
that would be automatically produced had they chosen 3D.