Interaktive Computergrafik
VL Interaktive Computergrafik
VL Interaktive Computergrafik
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Flashcards
Why is the CMYK color model often used in favour of the CMY color model?
Why was the YUV color model developed?
How does the color model described by the HSV model look?
How does the color model described by the HSL model look?
What aspect does the H dimension of the HSV color model control?
What advantages has the HSV color model have?
Asking small children, what the number halfway in between 1 and 9 is, often results in the answer of 3 instead of 5. Why is that the case?
Most visual sensors and displays have a characteristic nonlinear relationship of input and output signal levels. How can we compensate for this distortion?
Which postulation describes the connection between a stimulus’ intensity and the perceived intensity?
How does a stimulus’ intensity and the perceived intensity relate to one another?
The eye is more sensitive for ...... areas than for ...... areas. The eye ....... discontinuities of brightness.
....darker...
...brighter...
..accentuates...
What is the result of floor(1.65) ?
An intensity of 1 is mapped onto an 8 bit number with gamme=0.3. Which value is assigned to the number?
The definition of picture elements (or pixels for short) given does not match the structure and principles of human vision and the eyes on a fundamental level. What are reasons for this mismatch?
The graphics card is sending pixel information to the screen for every frame to be rendered. Let us assume a display resolution of 1920 (h) x 1080 (v) with a fixed refresh rate of 60 Hz, 8 bits per pixel primary color channel, three channels, and no compression. How much net bandwidth do the components have to provide.
Identify the situations, where it seems advisable to choose a graphics type over the other. Remember limitations for the situations. Vector or Raster?
situations: text, logo design, user interface objects, CAD modeling, omage manipulations, sensory input, display output
Vector: text, logo design, user interface objects, CAD modeling
Raster: omage manipulations, sensory input, display output
Assign common image formats to the way their information is primarily described. Vector or Raster Format
formats: Postscript, PNG, TIFF, JEPG; GIF, SVG
Vector Format: Postscript, SVG
Raster Format: PNG, TIFF, JPG
Which image descriptions are resolution independent?
How can color be described by a limited amount of bits?
Which amount of bits are typically used for which color model coding?
black and white, true color, 256 colors from color table
1 bit: black and white image
8 bits: 256 colors out of a color table
24 bits: True Color, 256 shades for each primary color
What is aliasing?
What types of aliasing exist?
What is true of the Supersampling approach?
What is true of grid sampling?
What is true of stochastic sampling?
What is true of stratified sampling?
Nyquist-Shannon Theorem and Audiophiles
Audiophiles do love analog and lossless digital records. The most prominent argument is recognizable sound quality manifesting itself in less noise. Under which circumstances is the Nyquist-Shannon Theorem contradicting better sound quality and renders the lossy compressions like MP3 a competitive alternative.
Nyquist-Shannon Theorem and Video-/Audiophiles
What can a recorder do before recording to diminish aliasing within audio and visual data
What is true for Photo Realism?
How can light interact with objects?
Which are physical models for light?
What is true for Photons in the Photon-based Light Propagation Model?
When creating an image with photon forward propagation…
Photon backward propagation …
Which are requirements for raytracing?
Which kind of algorithms are required for raytracing?
Which order of pseudo code instructions is necessary for the raytracing algorithm?
What is true of a ray starting at point x0 that runs in direction d ?
How many intersections can there be when testing ray-sphere intersections?
In which case are there no intersections of a plane defined by n*x-d=0 and a ray defined as x(t)=x0+td?
