# Video Engineering MCQ Questions and Answers – RGB and YUV Representation of Video Signals

This set of Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “The RGB and YUV Representation of Video Signals”.

1. Which color model is used for most computer model and video systems?
a) RGB
b) RYB
c) CMY
d) HSV

Explanation: The most common and well known color model is RGB, in which colors are broken down into various combinations of red, green and blue. RGB is the color model for most computer monitors and video systems that use 24 bit color depth, which means that each pixel for each of the three colors is represented by 8 bits of data.

2. A color in the RGB color model is described by indicating how much each of the red, green and blue is included.
a) True
b) False

Explanation: Color in the RGB color model is described by indicating how much each of the red, green and blue is included. The color is expressed as an RGB triplet (R, G, B), the component of which can vary from zero to a defined maximum value. If all the components are at zero the result is black and if all are at maximum, the result is the brightest representable white.

3. What is the range of component values often stored as integer numbers and represented as either decimal or hexadecimal numbers in RGB video signal?
a) 0 to 255
b) 10 to 500
c) 1 to 255
d) 255 to 550

Explanation: In computers, the component values are often stored as integer numbers in the range of 0 to 255, the range that a single 8 bit or byte can offer. These are often represented as either decimal or hexadecimal numbers.

4. What is the notation for RGB triplet (255, 0, 0) or sometimes #FF, 00, 00 (hexadecimal) in RGB video signals?
a) Digital 16-bit per channel
b) Digital 32-bit per channel
c) Digital 8-bit per channel
d) Digital 64-bit per channel

Explanation: For RGB triplet (255, 0, 0) or sometimes #FF, 00, 00 (hexadecimal) the notation is digital 8 bit per channel. In many environments, the component values within the ranges are not managed as linear (that is, the numbers are non-linearly related to the intensities that they represent). A representation with only 8 bits per component is considered sufficient if gamma and coding is used.

5. What is the mathematical relationship between RGB (Red, green and blue) and HSI (Hue, saturation and intensity) space?
a) H = H + S + I / 3
b) H = H + S + I + R + G + B / 6
c) H = cos-1($$\frac {\frac {1}{2} ((R – G) + (R – B) )}{(R – G)^2 + (R – B)(G – B) }$$)1/2
d) H = H + S + I + R + G + B / 3

Explanation: Although the RGB model is the most common, there are several other color models as well. HSI (Hue, saturation, intensity) is often used by artists because they find it more intuitive to think about a color in terms of hue and saturation rather than additive or subtractive color components. Following is the mathematical relationship between RGB (Red, green and blue) and HSI (Hue, saturation and intensity) space:
I = R + G + B / 3
S = 1 – 3 / (R + G + B) min (R, G, B)
H = cos-1($$\frac {\frac {1}{2} ((R – G) + (R – B) )}{(R – G)^2 + (R – B)(G – B) }$$)1/2
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6. What does Y in the YUV model stands for?
a) Luma
b) Puma
c) Yuma
d) Huma

Explanation: YUV is a color model that takes into account human visual perception and reduces the bandwidth for chrominance components. The Y in the YUV stands for “luma” (brightness, or lightness). U and V provide color information and are “color difference” signals of blue minus luma Cb (B – Y) and red minus luma Cr (R – Y).

7. YUV is a color space typically used as part of a color image pipeline.
a) True
b) False

Explanation: Part of a color image pipeline typically uses YUV as a color space. Human perception is taken into account while encoding a color image or video, which allows reduced bandwidth for chrominance components, thereby typically enabling masking of transmission errors or compression artifacts by the human perception than using a “direct” RGB representation.

8. Which of the following is described as how pure the color is, which depends on the spread or bandwidth of the light spectrum?
a) Hue
b) Saturation
c) Luminance
d) Chrominance

Explanation: Saturation is described as how pure the color is, which depends on the spread or bandwidth of the light spectrum. The RGB primary commonly used for color display mixes the luminance and chrominance attributes of a light. In many applications, it is desirable to describe a color in terms of its luminance and chrominance content separately, to enable more efficient processing and a transmission of color signals.

9. What are the components of one color image defined in YUV color coordinate?
a) Y, Nr, Bs
b) Y, Xe, Br
c) Y, Cb, Cr
d) Y, Br, Bs

Explanation: The Y, Cb and Cr components of one color image are defined in YUV colour co-ordinate, where Y is commonly called the luminance and Cb, Cr are commonly called the chrominance. The meaning of luminance and chrominance is described below:
Luminance: received brightness of the light, which is proportional to the total energy in the visible band.
Chrominance: describe the perceived colour tone of a light, which depends on the wavelength composition of light chrominance is in turn characterised by two attributes hue and saturation.

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