just write introduction about the digital image , the SciLab program
To improve the
visual display of an image by Contrast S
(1) Read, display and contrast stretch an image as
rompt the user to enter
the filename of an image,
a histogram of the image,
contrast stretch the image to
levels by changing the actual image pixel values,
display the stre
tched image, and
nd plot a
gram of the stretched image.
(2) Repeat the above but stretch the displayed image by changing the look
up table (i.e. the
) rather than changing the actual pixel values of the image.
The image you are to use is
and it can b
e downloaded from the PCN112
function (part of
assumes that the pixel values are in the range 0 to
and displays the image using 256 grey levels.
You can download
(2) You have
create more that 1 histogram, so it would be a good idea to write the histogram
part of your program as a function.
(You can lo
ok at the code for
to see how to make a
What to s
report should include:
commented source listing of your program
a presentation of your results, i.e. copies of the images, histograms and graphs of the LUTs,
discussion of the results.
In the discussion you should describe the appearances of the original and enhanced images and
those features/shapes of the histograms and LUTs that relate to the contrast enhancement. The
aim of the assignment is to compare two
methods of contrast enhancement so therefore the
relative merits (i.e. advantages and/or disadvantage) of each method should be discussed.
Please email me a copy of your program so that I can run it if necessary.
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