This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Gray Scale Vs Binary Imaging”.
1. Which type of conversion is involved in machine vision inspection system?
a) Continuous tone image into a binary image
b) Binary image into a continuous tone image
c) Binary image into black and white image
d) Low quality grayscale image to high quality grayscale image
Explanation: The machine vision inspection systems involve conversion of continuous tone image (or gray scale) as seen by a B & W television camera into a binary image. Considerable skill are used for this in optics and lighting.
2. How many different values can be picked by gray scale image?
Explanation: For a grayscale image, the intensity of the image varies across the brightness spectrum. This variation is gradual. The intensity is a whole number at any point in range of 0 to 255, thus it can pick a value from 256 different values.
3. What is the meaning of pixel value ‘1’ in binary imaging?
Explanation: Any image is made of number of pixels and value of these pixel may vary between a certain range. For binary image, the pixel value is 0 or 1 which means only two shades. 1 is for white and 0 is for black.
4. Which of the following option is correct for the given statements about gray scale and binary imaging?
Statement 1: All binary images are gray scale images.
Statement 2: In gray scale imaging, every pixel is represented by 8 bits.
a) F, F
b) T, F
c) F, T
d) T, T
Explanation: All binary images are grayscale but all grayscale images are not binary images as binary image can take only 2 values. Grayscale have transition between pure white or pure black.
5. What is the most important characteristic of a binary image?
b) Distance transform
Explanation: An important characteristic of a binary image is the distance transform. Distance transform gives the distance of every set pixel from the nearest unset pixel. The distance transform can be calculated efficiently.
6. What is the format of binary images?
Explanation: The format of binary image is PBM or portable bit map and PGM or portable gray map is the format of grayscale images. PPM is also a image format and is known as portable pix map.
7. Which type of display is used to read fonts of character?
a) 2 segment display
b) 4 segment display
c) 6 segment display
d) 7 segment display
Explanation: Fonts of characters are read by a display of 7 segments. It is a form of electronic display device which is widely used in electronic meters, basic calculators and electronic meters etc.
8. Which is not a part of the parameters used to define grayscale in gray scale model?
Explanation: In some cases, rather than using the RGB or CMY color models to define grayscale, three other parameters are defined. These are hue, saturation and lightness. In a grayscale image, the saturation is apparent color intensity, hue is apparent color shade and lightness is apparent brightness.
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