c++ - how to use openCV as a motion detector (not looking for video output) -


i'm new c++ , have been doing lot of research opencv. i'm making motion detector using webcam , trying use trigger function (kind of listener). don't need kind of visual video in application. need sense motion , give output boolean instance.

i more familiar java has written in c++, no wrappers, no converters.

can please point me in write direction. maybe tutorial or suggestion of should up. different library should use rather opencv.

as starting point, i'd recommend using basic image subtraction take there.

the basic algorithm is:

firstframe = readframe()  firstframegrey = converttogreyscale(firstframe) // makes image b&w  while true      secondframe = readframe()     secondframegrey = converttogreyscale(secondframe)      difference = sub(firstframegrey, secondframegrey)      threshold()      // perform morphological operations     erosion()     dilation()      findcontours()  // loop on contours , try filtering based off of area, perimeter etc. // filtration allow detect significant changes.  // update frame firstframegrey = secondframegrey

for morphological operations, experiment different values , see results get.

more info on thresholding

this tutorial explains how perform morphological operations.

contours info can found here along area api

the algorithm should self explanatory , opencv has methods named.


Comments

Post a Comment

Popular posts from this blog

PHP and MySQL WP -

i trying accomplish 2 things here code. writing php directly wp page using insert php plugin. 1) query mysql database , return results 1 column 4 columns. 2) make each result own hyperlink directs user new wp page runs new query on page. i able query show results , turn results dynamic hyperlink, cannot formatting down. right returns result 1 column. here have: [insert_php] $servername = "localhost"; $username = "login"; //edited privacy $password = "password"; //edited privacy $database = "database"; //edited privacy // create connection $conn = new mysqli($servername, $username, $password, $database); // check connection if ($conn->connect_error) { die("connection failed: " . $conn->connect_error); } echo "connected successfully"; //get results database $result = mysqli_query($conn,"select mine mines order mine"); $all_property = array(); //declare array saving property //showing proper...
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

go - golang pprof for c library code -

i have been trying profile golang application pprof, seems details of c code(linked static library) missed in output result. flame graph from frame graph can see c code time consuming reported within "runtime._externalcode", no details @ all. , sure static library compiled debug enable. so there way make pprof details(like stack trace) of 3rd party c code? or there other golang profiling tool this?
Read more