Matlab代写 - COSC 445 – Computer Vision

A4 (40 points) – Due October 16th, 2020
Focus: Morphological Processing, Shape-based Segmentation
1. [7 points]: Consider the binary image and the structuring element below. Do the following by hand
(don’t use a computer):
a. Label the 4-connected components in .
b. Label the 8-connected components in .
c. Find the output of morphologically opening with – assume the origin of is at its center.
d. Find the output of morphologically closing with ̂, where is the background.
e. Using the results from (c) and (d) above, show that opening and closing are duals of each
other, i.e., ( ∘ ) = ( • ̂). (an explanation with few words will do).

0 0 0 0 0 0 0 0 0 0
0 1 1 1 0 0 1 0 0 0
0 0 1 1 0 1 0 1 0 0
0 1 1 0 0 0 0 1 0 0
0 0 1 0 0 0 1 0 0 0
0 0 0 1 0 0 1 0 1 0
0 0 0 1 1 0 0 1 1 0
0 0 0 1 1 1 0 0 0 0
0 0 0 0 1 1 0 0 0 0
0 0 0 0 0 0 0 0 0 0

1
1
1

Marking guide:
+1 for a,b,e
+2 for c,d

2. [10 points]: Use the image ‘money.png’ with this assign, then implement a morphology-based
algorithm in Matlab to compute and display the amount of money in \$ in the image. The output
should be as shown below.

Marking guide:
+2 for breaking up the
image into coins
+3 for segmenting based on
coin types (+1 for each
type of coins)
+3 for computations based
on the coin type
+2 for overall logic and
correctness

There is \$11.50 in this image.
COSC 445 – Computer Vision
Winter 2020 T1
Dr. M. S. Shehata

3. [13 points] [Adapted from Gonzales textbook Q9.36]: A preprocessing step in an application of microscopy is
concerned with the issue of isolating individual round particles from similar particles that overlap in
groups of two or more particles (see following image – available on Connect as ‘particles.png’).

Assuming that particles have between 230 to 275 pixels per particle:
(a) Implement in Matlab an algorithm that uses “Connected Component Analysis” to produce three
images consisting respectively of
• Only of particles that have merged with the boundary of the image.
• Only overlapping particles.
• Only nonoverlapping particles.

(b) Extend your Matlab program so that it merges the above three image into one colored image that
displays the three classes of particles in three different colors (see example below).

Marking guide:
+9 for segmenting based
on particle (+3 for each
type)
+2 for generating and
displaying three
grayscale images.
+2 for the color image.

particles merged with the boundary nonoverlapping particles overlapping particles
3 classes of particles
COSC 445 – Computer Vision
Winter 2020 T1
Dr. M. S. Shehata

Note the following:
• Don’t dilate, erode, open, or close the given image.
• To build the colored final image, use the grayscale images as the three RGB components. Refer to
the course’s intro to Matlab lecture notes to see how to build a 3D array from several 2D arrays.
• Useful Matlab functions: padarray, find, cat.

4. [10 points]: Use the image ‘445_descr.png’. Implement a morphology-based algorithm in Matlab that
will split the given image into two: one with the text only and one with the background only. The
output should be similar to the images below.
445_descr.png

Text only

Background only

Marking guide:
+6 for extracting and displaying the background
+4 for extracting and displaying the text

Submission Instructions
1- Solve Q1 in Word/Excel/or similar program.
2- For each question Q2 to Q4, write a separate Matlab program or function.
3- Submit everything as one zip file to canvas. Note that you can resubmit an assignment, but
the new submission overwrites the old submission and receives a new timestamp.