Spring 2011 Test 3 Dr.JimRowan
Images used in this test are found in the folder named: test3ImagesSpring2011.
1) Looking at the Mpeg compression technique 3 seen in image1.jpg the frames are
shown in frame capture sequence, frame 1 to frame 10 and it can be seen that the
transmission sequence is different than the capture and the playback sequence. Which
frame(or frames) are needed to reconstruct frame 3 during playback?
2) What animation technique involves painting different picture elements on clear sheets
of plastic, stacking them and then taking a photograph?
3) What animation technique was used to create South Park?
4) What animation technique was used to create Gumby and Wallace and Gromit?
5) 3D computer-based animation techniques automatically create shadows but they
require the animator to control what two additional 3D modeling elements?
6) Which two animation techniques require that you draw the shading and shadows on
every frame?
7) Which animation technique readily lends itself to addressing current events because it
takes the least amount of time to produce?
8) There are two techniques of image compression discussed in this class. Compressing
each frame of a video as a completely specified image (like Mpeg compression technique
1 seen in image1.jpg) is what kind of video compression?
9) There are two techniques of image compression discussed in this class. A form of
video compression that involves storing the difference of a key frame and subsequent
frames (like Mpeg compression technique 2 seen in image1.jpg). What kind of
compression is this? (the answer in this case is NOT differencing or vectoring which are
two forms of this technique)
10) Which of the video compression techniques shown on image1.jpg would most likely
result in the largest compressed video filesize?
11) You have two videos that are the same file size. One is a home video of a family
vacation and the other is from your security system taken while you were away on that
vacation. Both were filmed with the same kind of camera. Which of these two videos
(vacation or security) would compress to the smallest file size if you use a temporal
compression technique?
12) You have two videos that are the same file size. One is a home video of a family
vacation and the other is from your security system taken while you were away on that
vacation. Both were filmed with the same kind of camera. You compress these two
videos using spatial compression. Will the vacation video be larger than the security
video, the security larger than the vacation or will they be the same size?
13) image3.jpg shows a single frame from a video. One can plainly see that there is a
problem with this frame. What is the name given to this kind of problem?
14) image2.jpg shows an actor playing the part of an animated character in the movie
Avatar. What name is given to this kind of technology?
15) Describe the cause of the problem seen in image3.jpg and mentioned in #12 above?
16) In fully immersive virtual reality the user’s view of the real world is blocked and
replaced by two images, one for each eye. These two images are produced by a computer.
Why two images, one for each eye?
17) Explain why converting film to video is problematic.
18) Tweeners use interpolation to fill in the frames between key frames. Which of the
two kinds of interpolation mentioned in class would be used to fill in the frames so that
the moving objects move at a constant speed between key frames?
19) image4.jpg shows a new kind of greeting card that requires the card, a webcam and
some special software to view. What kind of computer graphics technique is this card
using?
20) The fusion rate for humans is 40 frames per second. What does this mean?
21) This fusion rate can vary. What causes the fusion rate to vary?
22) Chrominance sub-sampling takes advantage of what human visual characteristic?
23) Video codecs are responsible for encoding and decoding images. Some of these
codecs are symmetric, some are asymmetric. What does it mean if a codec is symmetric?
24) A new satellite TV provider needs to pick a codec to use with the service. Why would
they choose an asymmetric codec rather than a symmetric codec?
25) Last year broadcast TV changed from analog to digital. What is one negative feature
of digital broadcast TV over analog?