CSCE 5683 - Homework 1
Due Date - 09/14/2012 at 11:59 PM

1. Problem Statement:

The goal of this assignment is to create a program that enhances an input image by moving the average image intensity into the middle of the output intensity range. Thus, dark images will be brightened, and bright images will be darkened. To accomplish this transformation, you must perform piecewise linear mappings on the image intensity function.

2. Design:

To accomplish this goal, your program must first calculate the min, max, and ave pixel values for an input image. You can do this by looping over the image. You should print these values out for debugging purposes.

Next, you must define linear mappings so input pixels in [min..ave] range are mapped into the [0..127] range in the output image. Similarly, input pixels in [ave+1..max] range must be mapped into [128..255] in the output.

Once the mapping function is defined, you can loop over the input image and transform intensity values to create the output image. Save the output as a jpg image, and then compare it to the input image. Does it perform as expected (dark -> lighter, light -> darker)? What happens if you apply the operation twice on an image? Does it stay the same or change?

3. Implementation:

You can implement this program using either a bottom-up approach or a top-down approach. If you go for a bottom-up approach, start by creating basic methods and classes, and test theses methods using a simple main program that calls each method. When this is working, you can create the main program that uses these methods to solve the problem above.

If you go for a top-down approach, start by creating your main program that reads user input, and calls empty methods to pretend to solve the problem. Then add in the code for these methods one at a time. This way, you will get an idea of how the whole program will work before you dive into the details of implementing each method and class.

Regardless of which technique you choose to use, you should develop your code incrementally adding code, compiling, debugging, a little bit at a time. This way, you always have a program that "does something" even if it is not complete.

4. Testing:

Test your program to check that it operates correctly for all of the requirements listed above. Also check for the error handling capabilities of the code. Try your program on 2-3 input images, and save your testing output for submission on the program due date.

5. Documentation:

When you have completed your C++ program, write a short report (2-3 pages long) describing what the objectives were, what you did, and the status of the program. Include sample input/output images to illustrate how the code works. Does it work properly for all test cases? Are there any known problems? Save this report in a separate file to be submitted electronically.

6. Project Submission:

In this class, we will be using electronic project submission to make sure that all students hand their programming projects and labs on time, and to perform automatic analysis of all programs that are submitted. When you have completed the tasks above go to the class web site to "submit" your documentation, C++ program, and testing files.

The dates on your electronic submission will be used to verify that you met the due date above. All late projects will receive reduced credit (50% off if less than 24 hours late, no credit if more than 24 hours late), so hand in your best effort on the due date.

You should also PRINT a copy of these files and hand them into your instructor your next class. Include a title page which has your name and uaid, and attach your hand written design notes from above.