# 3.2 Finding shapes in images  (Page 4/4)

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```function [Thetas, Rhos] = fcn( thetas,rhos)% This block supports an embeddable subset of the MATLAB language. % See the help menu for details.%initialise a frame count persistent count;if isempty(count) count = 0;end %remember previous outputspersistent lastRhos; persistent lastThetas;%initialise to same as first input for first entry into function if isempty(lastRhos)lastRhos = rhos; endif isempty(lastThetas) lastThetas = thetas;end %Assume that all is OK initiallyRhos = rhos; Thetas = thetas;if count == 4 %after the 4th frame, engage the test logicfor I = 1:length(rhos) if (abs(rhos(I) - lastRhos(I))>30) || (abs(thetas(I) - lastThetas(I))>10*(pi/180)) %too much change - just use the old values% outR(I) = lastRhos(I); % outT(I) = lastThetas(I);Rhos(I) = lastRhos(I); Thetas(I) = lastThetas(I);end endelse %otherwise just output the computed valuescount = count+1; end%assign outputs %Rhos = outR;%Thetas = outT;%remember outputs for next time lastRhos = Rhos;lastThetas = Thetas;```

Connect the block as shown in the following picture:

In the main model, double-click the “Line Drawing and Image Construction” block.

Change the configuration of the “Draw Lines” block as follows:

Now, it will draw the polygon based on the two longest lines.

Add the following blocks to the subsystem:

 Block Library Quantity Concatenate Simulink /Math Operations 2 Selector Simulink / Signal Routing 3 Gain Simulink / Math Operations 1 Relational Operator Simulink / Logic and Bit Operations 1 Logical Operator Simulink / Logic and Bit Operations 1 Submatrix Signal Processing Toolbox:“Math Functions / Matrices and Linear Algebra / Matrix Operations” or “Signal Management / Indexing” 1

Connect the blocks as follows:

The blocks should be configured as follows:

• Selector5:
• Selector4:
• Selector3:
• Vertices Matrix:
• Draw Lane
• Superposition of Lane and Original Image
• Extraction

Rename the “Line Detection” to “Lane Detection”. Save the model as “LaneDetection.mdl” The model should look as follows:

Double Click the Lane Detection block. You may rename the blocks’ names. It will look as follows:

Running this gives you the images in Figure 7.

## Procedure

Open the “ RW_dm6437_tcpip.mdl ” Simulink model (generated in the " A Framework for Video Processing with the DM6437 DVDP " module).

Save the model as "lane_dm6437_tcpip.mdl".

Change the name of the “R_W Algorithm” block to “Lane Algorithm”.

Right click on the "Build/Reload&Run" subsystem, choose “Block Properties”. Go to the Callbacks tab, and under OpenFcn* enter: “lane_tcpip_script('lane_pcl_tcpip');”, as shown in the following picture:

Double-click the “Task” block and make the same changes as shown:

Double-Click the “Lane Algorithm” subsystem.

Copy "Lane Detection and Tracking" block from "LaneDetection.mdl" into this model as shown.

Configure the "TCP/IP Receive" block :

Configure the "TCP/IP Send" block :

Configure the "Byte Unpack" block :

Configure the "Byte Pack" block :

Open the "RW_pcl_tcpip.mdl" model, created in the "Video R_W" directory.

Save the model as "lane_pcl_tcpip.mdl".

Double-click the “Video Source” block and make the same changes as shown:

Configure the "TCP/IP Receive" block :

Double-click the “Display” block, Double-click the “Data Unpack” block and Configure the "Byte Unpack" block as shown:

```function lane_tcpip_script(hostModelName) % controls host-side TCP/IP processing for% Video Surveillance demo: %********** Initialization ********************% Get model name modelName = gcs;% Connect to CCS CCS_Obj = connectToCCS(modelName);saved_visibility = CCS_Obj.isvisible; CCS_Obj.visible(1);% Load application loadApp(modelName, CCS_Obj);% Run application fprintf('Running application: %s\n', modelName);CCS_Obj.run; % Allow some time for DHCP address acquisitionpause(3); % Retrieve target's host nameboardType = get_param([modelName '/IP Config'], 'boardType');userPrompt = sprintf('Enter the IP address or the host name of the %s board: ', boardType); hostName = inputdlg(userPrompt, 'Target IP address');if isempty(hostName) errordlg('You have to provide a valid IP address or host name to run the demo.',...'TCP/IP Surveillance Recording', 'modal'); return;end hostName = strtrim(hostName{1});% Launch host side UDP receive / Video display model fprintf('Launching host side application: %s\n', hostModelName);open_system(hostModelName); % Update host side TCP/IP blocks with target's IP addressset_param([hostModelName '/TCP//IP Send'], 'Host', hostName);set_param([hostModelName '/TCP//IP Receive'], 'Host', hostName);fprintf('Click on play button to start running the host side application!\n\n') %[EOF]tcpip_surveil_script.m```

Open a new m-file, copy the following code and save it as "lane_tcpip_script.m" at the same directory as the model.

## Running the real-time model

Build load and run the project from the "lane_dm6437l_tcpip.mdl" model. Double-click the "Build / Reload&Run" block.

Running the script, you will see:

anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
Introduction about quantum dots in nanotechnology
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
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