<< Chapter < Page Chapter >> Page >
This test determines whether a fish is a salmon or a trout based on the detection of the number of fins it has using the 1-D DWT

So far the testing process could determine general color trends and size of the fish. Yet the fish size ratio test treated the fish as a block and fish contours have a good amount of detail in their fin patterns. Therefore, we decide that fins on a fish are important to examine.

We use the 2D DHWT on a gray intensity image and get back a low frequency image of the fish, for rangeto/2. We then look only at the rows of this signal that have enough value to be considered actually mass of the fishes body. For every row with mass, we transform the values into binary for the actual parts of the fish. We then take the derivative of that row vector which returns a positive 1 on a rising edge of a body and a negative 1 on the end of that body mass. The +1 points are more reliabe for a fish and give us the location of a fin. Yet, as we look at a fin that is slightly angled, we will get a diagonal matrix of 1s for the same fin. Therefore, we group +1 that are within a range and call that a fin.

Fin testing image

The binary fish image before the derivative is taken and the edges of the fins located.

Description of the discrete haar wavelet transform

As with all transforms, the DHWT takes the image signal and multiplies it by an orthonormal basis. Wavelets form a basis that are built by a mother wavelet and then different widths and shifts of that wavelet. The DHWT is built by averaging values next to each other and then taking the difference of the values. The Haar Wavelet Transform is ideal for low pass filtering and looking at different ranges of frequency. By taking different levels of the DHWT we can create different resolutions for an image, but each level of DHWT cuts the signal samples in half. We used the second level of DHWT to get similar blocks. DHWT also works as a rough edge detector but is not ideal.

Code for fin detection

% This function looks through a grayscale version of the input rgb image and % tries to detect fins by looking at each line of the picture and looking for% where the data starts and stops. function [fins]= findet(image); grayimage = rgb2gray(image);[wide, length] = size(grayimage);Mass = 0; n = 1;frontedge = zeros(1,(length/2 -1)); backedge = zeros(1,(length/2 -1));for i = 1:wide tempfishrow = dwt(grayimage(i, :),'haar');fishrow(i,:) = double(tempfishrow); if sum(fishrow(i,:))<= 0.9 Mass = Mass;else n = n + 1;Mass = 1 + Mass; fishrow(i,:) = fishrow(i,:) > 0;diffrow(i,:) = diff(fishrow(i,:)); for j = 1:(length/2 - 1)if diffrow(i,j) == 1 frontedge(1,j) = frontedge(1,j) + 1;elseif diffrow(i,j) == -1 backedge(1,j) = backedge(1,j) + 1;end endend endfrontedgefilter = frontedge >=10; frontedgeextreme = frontedge >=11;backedge = backedge >=3; for i = 1:(length/2 -1)if frontedgefilter(1,i) == 1 if sum(frontedgefilter(1, i:i+10)) > 1frontedgefilter(1, i:i+10) = [1 0 0 0 0 0 0 0 0 0 0];end endend fins = sum(frontedgefilter) - 1;
Got questions? Get instant answers now!

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Ece 301 projects fall 2003. OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10223/1.5
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Ece 301 projects fall 2003' conversation and receive update notifications?

Ask