Name of the College : Noorul Islam College of Engineering
University : Anna University
Degree : B.E
Department : Electronics and Communication Engineering
Subject Code/Name : EC 1009 – Digital Image Processing
Year : IV
Semester : VII
Document Type : Question Bank
Website : niceindia.com
Download :https://www.pdfquestion.in/uploads/ni…PROCESSING.pdf
NICE Digital Image Processing Question Paper
UNIT I
2 Marks :
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.
Related : Noorul Islam College of Engineering CS1401 Internet Programming B.E Question Bank : www.pdfquestion.in/2952.html
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. 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.
4. 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.
5. 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.
6. 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.
7. List the hardware oriented color models? :
1. RGB model
2. CMY model
3. YIQ model
4. HSI model
8. 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.
9. 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
10. 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.
11. Define Resolutions? :
Resolution is defined as the smallest number of discernible detail in an image. Spatial resolution is the smallest discernible detail in an image and gray level resolution refers to the smallest discernible change is gray level.
12. What is meant by pixel? :
A digital image is composed of a finite number of elements each of which has a particular location or value. These elements are referred to as pixels or image elements or picture elements or pels elements.
13. Define Digital image? :
When x, y and the amplitude values of f all are finite discrete quantities , we call
the image digital image.
14. What are the steps involved in DIP? :
1. Image Acquisition
2. Preprocessing
3. Segmentation
4. Representation and Description
5. Recognition and Interpretation
15. What is recognition and Interpretation? :
Recognition means is a process that assigns a label to an object based on the information provided by its descriptors. Interpretation means assigning meaning to a recognized object.
UNIT II
1. Specify the objective of image enhancement technique. The objective of enhancement technique is to process an image so that the result is more suitable than the original image for a particular application.
2. Explain the 2 categories of image enhancement.
i) Spatial domain refers to image plane itself & approaches in this category are based on direct manipulation of picture image.
ii) Frequency domain methods based on modifying the image by fourier transform.
3. What is contrast stretching? Contrast stretching reduces an image of higher contrast than the original by darkening the levels below m and brightening the levels above m in the image.
4. What is grey level slicing? Highlighting a specific range of grey levels in an image often is desired. Applications include enhancing features such as masses of water in satellite imagery and enhancing flaws in x-ray images.
5. Define image subtraction. The difference between 2 images f(x,y) and h(x,y) expressed as, g(x,y)=f(x,y)-h(x,y) is obtained by computing the difference between all pairs of corresponding pixels from f and h.