EC_1034_-_Digital_Image_Processing

# EC_1034_-_Digital_Image_Processing - NOORUL ISLAM COLLEGE...

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NOORUL ISLAM COLLEGE OF ENGG KUMARACOIL DEPARTMENT OF EIE 2 MARKS, QUESTIONS & ANSWERS EC 1034 - Digital Image Processing Class: S8 EIE Prepared by: V.AMSA VENI, LECTURER,EIE

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1. Define Image? An Image may be defined as a two dimensional function f (x,y) where x & y are spatial (plane) coordinates, and the amplitude of f at any pair of coordinates (x,y) is called intensity or gray level of the image at that point. When x,y and the amplitude values of f are all finite, discrete quantities we call the image as Digital Image. 2. Define Image Sampling? Digitization of spatial coordinates (x,y) is called Image Sampling. To be suitable for computer processing, an image function f(x,y) must be digitized both spatially and in magnitude. 3. Define Quantization ? Digitizing the amplitude values is called Quantization. Quality of digital image is determined to a large degree by the number of samples and discrete gray levels used in sampling and quantization. 4. What is Dynamic Range? The range of values spanned by the gray scale is called dynamic range of an image. Image will have high contrast, if the dynamic range is high and image will have dull washed out gray look if the dynamic range is low. 5. Define Mach band effect? The spatial interaction of Luminance from an object and its surround creates a Phenomenon called the mach band effect. 6. Define Brightness? Brightness of an object is the perceived luminance of the surround. Two objects with different surroundings would have identical luminance but different brightness. 7. Define Tapered Quantization? If gray levels in a certain range occur frequently while others occurs rarely, the quantization levels are finely spaced in this range and coarsely spaced outside of it.This method is sometimes called Tapered Quantization. 8. What do you meant by Gray level? Gray level refers to a scalar measure of intensity that ranges from black to grays
and finally to white. 9. What do you meant by Color model? A Color model is a specification of 3D-coordinates system and a subspace with in that system where each color is represented by a single point. 10. List the hardware oriented color models? 1. RGB model 2. CMY model 3. YIQ model 4. HSI model 11. What is Hue of saturation? Hue is a color attribute that describes a pure color where saturation gives a measure of the degree to which a pure color is diluted by white light. 12. List the applications of color models? 1. RGB model--- used for color monitor & color video camera 2. CMY model---used for color printing 3. HIS model----used for color image processing 4. YIQ model---used for color picture transmission 13. What is Chromatic Adoption? ‘ The hue of a perceived color depends on the adoption of the viewer. For example, the American Flag will not immediately appear red, white, and blue of the viewer has been subjected to high intensity red light before viewing the flag. The color of the flag will appear to shift in hue toward the red component cyan.

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EC_1034_-_Digital_Image_Processing - NOORUL ISLAM COLLEGE...

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