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资源说明：The Nerf Sentry Gun uses Scale Invariant Feature Transform via MATLAB to perform badge recognition of room entrants and fire upon those who don't have access! Using motion tracking, it can follow the intruder and fire darts at them. Images of the intruder are uploaded to the web and tweeted.
NERF SENTRY GUN --- README
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1. SOFTWARE INITIALIZATION
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What you will need:
- MATLAB, any version should be fine. We ran ours on R2008b
- Image Acquisition Toolbox, any version should be fine
- Data Acquisition Toolbox 2.8 or higher (if you wish to use an NI-DAQ USB 6008)
The basic syntax for running the software is:
>> imaqmotion_tracker(vid)
where vid is an object created via videoinput. The line to initialize this will change slightly depending on
your camera setup, but it generally looks something like this:
>> vid = videoinput('winvideo',1);
or
>> vid = videoinput('matrox',1);
If you are having trouble setting up your videoinput object, try
>> imaqhwinfo
for details. Once you've got a working setup, test things out with the following commands:
>> preview(vid) % Creates a preview window for the video object
>> getsnapshot(vid) % Takes a picture using the camera
Note that the software will not work properly if you don't set the values for ftp_upload and twit properly
before hand. If you don't want to do this, just comment out the lines. See "CUSTOMIZING" for more details.
Also make sure to download the BASIC stamp code - it shouldn't require much modification, though we wrote it to
use edge-sensing wires. If you aren't doing that, you might want to remove that functionality.
2. RUNNING THE SOFTWARE
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Once you have the software running, you'll immediately notice some GUI objects:
- Close. This closes the imaqmotion figure, but you'll also need to close the additional "Figure 1" before
restarting the software.
- "Authentication Mode". This tells the gun to actively prompt things that move in front of the camera for
badges and then shoots them if they fail to present a badge. This is the mode that will upload pictures &
Twitter.
- "Freefire Mode". Shoots anything that moves.
- "Panic Mode". Plays a siren, turns on the gun, and rotates the gun semi-randomly.
- "Manual Mode". Allows you to control the gun manually. Note that to use this you MUST shift your window
focus to "Figure 1" instead of the imaq window. Use arrow keys to rotate the gun and space to fire.
- Colormap select. Changes the colormap of the window to some various colormaps included in MATLAB.
- Pause.
- Toggle Coords. Turns on or off the display of motion & gun coordinates in the window - this makes things
run slightly faster.
- Sounds on or off. Enables or disables the lightsaber noises.
3. CUSTOMIZING
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There are a lot of values you can change to control how the gun operates when tracking motion. They are
explained in more detail within comments in the code, but here is a brief summary of the variables at your
disposal:
1) Threshold for movement - controls how much the value of a pixel must change between frames captured for it
to count as movement
2) Outlier constraints -
a) Data required. Controls how much movement must be detected for the x-coordinate of motion to be altered
from the average of recent, good data points.
b) Distance from recent average. Controls the limit on how far the new x-coordinate of motion can be from
the recent average for it to be considered acceptable.
3) Firing constraint - Controls how much motion is necessary to have the gun fire or not. Can be set differently
for authorization & freefire mode.
4) Grace period - how many frames the camera can capture without having the gun fire between authorization
sequences.
5) Turn thresholds -
a) Position updating. Controls how often the gun position will update.
b) Motor signals. Controls how much the gun position has to change to actually send a signal to the motor.
c) turnGunTo. You may wish to modify this m-file to control how much the gun turns based on your motor setup.
It really requires just playing with values until you find one that works. Ours took a while to accelerate,
so we used sqrt(), but if your motor moves in constant time just use (someconstant)*turn. Also, our gun
turned faster in one direction than it did in the other. To accomodate for this, multiply the time by some
separate constant in each portion of the if-statement based on which direction it is turning.
6) Sound threshold - how often the sounds play. You don't want this to be much more than like 4.
Customizing twitter and ftp_upload:
twit(strcat(datestr(clock),' , a subject approached the Nerf Sentry Gun and was AUTHORIZED.'),'username','password');
Change the values of 'username' and 'password' to their proper values. The first input argument controls the message
to be twittered, but the one I have written should be OK. Note that you MUST do this in 2 places in the code.
You should also go to the index.php file in the website folder and add the embed code for your twitter feed in the appropriate location.
To modify ftp_upload, you need to modify the actual function. Open it up and find this line:
f = ftp('server:port','username','password');
and change it to the proper values. Also, this code requires passive FTP to be enabled - open up the readme in the
passiveFtp folder and implement those instructions.
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