ITEC2110 Spring 2009 Test 2, Dr. Jim Rowan

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```ITEC2110 Spring 2009 Test 2, Dr. Jim Rowan
Images used in this test are found in the folder named: imagesTest2
1)-Using convolution Mask #4 found in ConvolutionMasks1.pdf, calculate the value of
the three pixels marked with an X on convolution Image #3 found in
ConvolutionImages.pdf. Show your work on the back of your crib sheet.
2)-Using the first convolution mask found in ConvolutionMasks2.pdf, calculate the value
of the three pixels marked with an X on convolution Image #3 found in
ConvolutionImages.pdf. Show your work on the back of your crib sheet.
3) In BooleanImageSet1.pdf image 1 shows two objects and image 2 shows those two
objects moved, one inside the other. Of the remaining images 3 through 6, which one
could show both the union of those two objects seen in image 2 and the intersection of
those two objects?
4) In BooleanImageSet2.pdf image 1 shows two objects and image 2 shows those two
objects moved, one inside the other. Of the remaining images 3 and 4, which one could
show both the union of those two objects seen in image 2 and the difference of the
smaller and the larger of the two objects?
5) In BooleanImageSet3.pdf image 1 shows those two objects moved so that one is inside
the other. Of the remaining images 2 through 4, which one shows an object that is the
difference of the larger and the smaller of the two objects?
6)- Which of these encoding/compression schemes are lossy?
a) Run Length Encoding
b) 24 bit RGB encoding
c) Table (or Dictionary) based encoding
d) JPEG
7) What kind of model building technique does Blender use?
8)-In ImageEncoding.pdf we see an image that measures 3 pixels by 3 pixels. If this
image is encoded as a Table- (or Dictionary-) based encoded image, what would be the
minimum number of bits needed to reference this color table?
9)- In ImageEncoding.pdf we see an image that measures 3 pixels by 3 pixels. Show the
byte string that would be produced if you were using run length encoding,
10)- In ImageEncoding.pdf we see an image that measures 3 pixels by 3 pixels. Show the
byte string that would be produced if you were using a table based encoding scheme,
11)- In imageSet4.pdf we see image 7, we find an image that measures 6 by 6. Without
image compression, how many bytes would be required to represent this image using 24
bit RGB encoding?
12)- In imageSet4.pdf we find image 7 we find an image that measures 6 by 6 pixels. If
using a color table representation of this image, how many bits would have to be used in
each entry of the pixel map to reference the color table?
13)- In imageSet4.pdf we find image 7 we find an image that measures 6 by 6 pixels.
Which of the following RGB color representations could be the color table entry for the
middle grey color seen in this image?
a) 255,0,0
b) 150,150,150
c) 255,0,255
d) 255,255,255
14)- What is it about human vision that JPEG image compression takes advantage of in
order to compress a file?
15)- Lighting a 3-D object realistically is complex. Ray tracing is one way to light a
scene that produces photo realistic results even when there are multiple objects in the
scene. What does ray tracing take into account that allows it to produce these
photorealistic results?
16)- A vector is defined by two characteristics. What are these two characteristics?
17)- What is one form of optical mixing that sacrifices resolution at the altar of color
accuracy?
18)- Why might you want to scan an image using 48 bit color when 24 bit color is more
than sufficient for human vision?
19)- (yes - no) The RGB color model, or tri-stimulus model, is modeled after human
color vision which relies on the 3 cones found in the eye. For this reason it can accurately
represent all the colors seen by humans.
20)-Which of these three color models can easily be used to model color when mixing
visible light and when mixing of paint?
a) CMYK
b) HSB
c) HSV
d) RGB
21)-Using the CMYK model, magenta is what you get when you remove what color(s)
from white?
22)- Using the CMYK model, yellow is what you get when you add what color to what
color light?
23)-Holding a ball painted with pure green paint you enter a room that is lit with equal
amounts of blue and green light. What color does the ball appear to be in this room?
24)- Red paint absorbs what color(s) of the spectrum? (“everything but the red” is not the
answer I am looking for)
25)- In imageSet4.pdf Image 5 and Image 6 are both wireframe objects made from a
sphere and a cylinder, which shows the union of one with the other?
a) Image 5
b) Image 6
```