Description
Problem 1
Load the grayscale image Text.bmp into Matlab.
1) Display the image
2) Plot a histogram of image pixel intensities.
3) Perform thresholding on the image to create a binary image. Describe the method and threshold
used. Display the binary image.
4) Apply 5 times the erosion morphological operator on the binary image from part (3). Display the
resulting image. What size kernel did you use?
5) Apply 5 times dilation morphological operator on image obtained in (4). Display the resulting
image. What size kernel did you use?
6) Are the image obtained in (5) and the image in (3) identical? Comment!
7) Find the absolute difference of the image created in (3) and image created in (5). Map this
difference to full dynamic range of 8 bits and display. Comment!
8) Using the same kernel size, apply 10 times the erosion morphological operator on the binary
image from part (3). Display the resulting image.
9) Using the same kernel size, apply 10 times dilation morphological operator on image obtained in
(8). Display the resulting image.
10) Are the image obtained in (9) and the image in (3) identical? Are the images obtained in (5) and
(9) identical? Comment!
11) Find the absolute difference of the image created in (3) and image created in (9). Map this
difference to full dynamic range of 8 bits and display. Comment!
Problem 2
Find the distance transform of the image bottle.bmp.
1) Display the image.
2) Plot a histogram of image pixel intensities.
3) Perform thresholding to create a binary image. Describe the method and threshold used. Display
the image.
4) Process the image to create solid foreground object without any “holes”. Describe the exact
approach used. Display the image
5) Find the distance transform. What is the maximum value of the distance transform? How many
pixels have this value?
6) Map the values of distance transform to the full dynamic range of 8 bits and display the distance
transform. Comment!
7) What are the area, perimeter and centroid of the object in part (4)? How did you compute those?
Note: Do not use any built in Matlab functions except for plotting, image read in, matrix operation.
Note: All plots must have a meaningful title and clearly labeled axis.
