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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:

Run your model.

Running this gives you the images in Figure 7.

Edge Detection on a Video Stream

Real time implementation using tcp/ip

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”.

The Real Time Implementation Model for Lane Detection

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:

Real-Time Edge Detection through a TCP/IP Interface

Questions & Answers

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
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Source:  OpenStax, From matlab and simulink to real-time with ti dsp's. OpenStax CNX. Jun 08, 2009 Download for free at http://cnx.org/content/col10713/1.1
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