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DEPARTMENT OF ECE EC 708 DIGITAL IMAGE PROCESSING (7 TH SEMESTER) 2 MARKS UNIT 1 DIGITAL IMAGE FUNDAMENTALS 1. Define Image? An image may be defined as two dimensional light intensity function f(x, y) where x and y denote spatial co-ordinate and the amplitude or value of f at any point (x, y) is called intensity or grayscale or brightness of the image at that point. When x, y and the amplitude values of f all are finite discrete quantities , we call the image digital image. 2. 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. 3. What do you meant by Color model? A Color model is a specification of 3D-coordinates system and a subspace within that system where each color is represented by a single point. 4. List the hardware oriented color models and List the applications of color models? 1. RGB model 2. CMY model 4. HSI model 2. CMY model---used for color printing 3. HIS model----used for color image processing Hue: hue is an attribute associated with the dominant wavelength in a mixture of light waves.It represents the dominant color as perceived by the observer. Saturation:It represents relative purity or the amount of white light mixed with hue.the degree of saturation depends on the amount of white light added. Red+white=pink Violet +white =lavender 6. What is meant by pixel? A digital image is composed of a finite number of elements each of which has a
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particular location or value. These elements are referred to as pixels or image elements or picture elements or pels elements. 7. What are the steps involved in DIP? 1. Image Acquisition 2. Preprocessing 3. Segmentation 4. Representation and Description 5. Recognition and Interpretation 8. Specify the elements of DIP system and Explain the categories of digital storage? 1. Image Acquisition 2. Storage 3. Processing 4. Display 1. Short term storage for use during processing. 2. Online storage for relatively fast recall. 3. Archical storage for infrequent access. 9. What is meant by machband effect and simultaneous contrast? *Machband effect means the intensity of the stripes is constant. Therefore it preserves the brightness pattern near the boundaries, these bands are called as machband effect. *The region reserved brightness not depend on its intensity but also on its background. All centre square have same intensity. However they appear to the eye to become darker as the background becomes lighter 10. Define weber ratio The ratio of increment of illumination to background of illumination is called as weber ratio.(ie) _i/i If the ratio (_i/i) is small, then small percentage of change in intensity is needed (ie) good brightness adaptation. If the ratio (_i/i) is large , then large percentage of change in intensity is needed
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This note was uploaded on 02/04/2012 for the course COMPUTER 101 taught by Professor Ahmed during the Spring '11 term at

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