Lab06s09 - GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of...

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GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of ELECTRICAL and COMPUTER ENGINEERING ECE 2025 Spring 2009 Lab #6: Digital Images: A/D and D/A Date: 17–23 Feb. 2009 You should read the Pre-Lab section of the lab and do all the exercises in the Pre-Lab section before your assigned lab time. The Warm-up section of each lab must be completed during your assigned Lab time and the steps marked Instructor Verification must also be signed off during the lab time by one of the laboratory instructors. After completing the warm-up section, turn in the verification sheet to your TA. It is only necessary to turn in Section 4 as the lab report for this lab. More information on the lab report for- mat can be found on t-square under the INFO link. Please label the axes of your plots and include a title and Figure number for every plot. In order to reduce orphan plots , include each plot as a figure embedded within your report. This can be done easily with M ATLAB ’s notebook capability. For more information on how to include figures and plots from M ATLAB in your report file, consult the INFO link on t-square , or ask your TA for details. Forgeries and plagiarism are a violation of the honor code and will be referred to the Dean of Students for disciplinary action. You are allowed to discuss lab exercises with other students and you are allowed to consult old lab reports, but you cannot give or receive written material or electronic files. Your submitted work should be original and it should be your own work. The lab report for this week will be a very brief Informal Lab Report. The report will be due during the period 24-Feb – 2-Mar. at the start of your lab. 1 Introduction One objective in this lab is to introduce digital images as a second useful signal type. We will show how the A-to-D sampling and the D-to-A reconstruction processes are carried out for digital images. In addition, this lab and the next one will have the objective of learn showing how interpolation is used to create color images for a digital camera. For the interpolation, you will learn how to implement FIR filters in M ATLAB , and then use these FIR filters to perform the interpolation of images. 1.1 Digital Images In this lab we introduce digital images as a signal type for studying the effect of sampling, aliasing and reconstruction. An image can be represented as a function x.t 1 ;t 2 / of two continuous variables representing the horizontal ( t 2 ) and vertical ( t 1 ) coordinates of a point in space. 1 For monochrome images, the signal x.t 1 ;t 2 / would be a scalar function of the two spatial variables, but for color images the function x. ; / would have to be a vector-valued function of the two variables. For example, an RGB color system needs three values at each spatial location: one for red, one for green and one for blue. Video or TV which consists of a sequence of images to show motion would add a time variable to the two spatial variables.
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