Thread: Calling Any Java Programmers - Computer Vision Project

hey alti. black and white will not work with the algroithm out of the box as I'm currently using an HSI colour model. This is less sensative to light changes, since only changes to hue (colour) and saturation of that hue are considered, and intensity is ignored.

b&w is purely an intensity based colour model, so you have two choices. Either switch on the considerIntensity flag, or switch to an RGB colour model. I'll make this configurable when I get some time.

I'll also make it deal with B&W better since at the moment it'll do 3 cycles per pixel (R G and B) but it only needs to do one.

the code you need to change is in teh constructor of the motion detector I beleive. I'll have a look at the code tonight and externalise these settings, but lemme know how you go if you make the changes yourself.


PS Tidy your room!

I changed the flag over and will check it out when i get home, thanks

sorry, I got busy all last night!

try both hsi with intensity and the rgb options, to see what works best.

alright i was able to get it to show the image from the camera in your app by changing tbe RGB flag to 1. have also played around with some of the other flags to see what happens, I changed the RGB elements flag from 3 to 1, thinkng that was what you were refering to above on the 1 vs 3 scans of the pixels.

I have messed with Hue, saturation, intesitity flag (both true and flase) and intesity

The best i get though is the image in the window, it does not seem to detec any motion. When it first starts up the image flickers light to dark and is grainy, it settles in to a better quality picture within 10 or 20 seconds, I image this is the code 'learning' the background.

I have to spend more time understanding yuor code, I think.

on a side note I have some color CCDs comming from Mark, should get to me next week.

excellent stuff. i'll test the algorithm on a b&w setup (I'll just use 1 channel for now). I'm hoping to do some this weekend, but I'll have some time this monday for sure as it's a bank holiday in the UK.

the code should makes some sense if read in conjunction with computer vision primer.

it sounds like you're looking at the image learnt rather than the foreground. I'm not sure if you messed with what is displayed. when you move in front of the camera, do you appear at all? check these in ProcessorTest:


// image = motionDetector.getBackground();
image = motionDetector.getForeground();

if you view the background, that'll show you the learnt model, so you can see it's learning correctly. the foreground will be the current frame minus the background (+ noise and other light variations)

Wow, this is some good stuff. I'll take a look at the application and source this weekend.

I'm a java programmer but I haven't actively been doing standalone application development for about a year now (got suckered into web services development) but shouldn't be much of a learning curve to get back into. I'll try to check this out, seems pretty neat.

I'm a web services sucker too. I do prefer standalone apps, but sadly the market demands otherwise.

welcome, and any questions, just ask.

Alti, you were right. the RGB model didn't work. it does now. download the latest jar, which now includes the source code.

I've left it in RGB mode so it shoudl work for B&W cameras out of the box now.

my camera is very very bad, so bad, that it's leaving a trail of it's encoding artifcats, making it hell. when there is motion, the camera changes the blocks behind the moved object. probably in an attempt to save bandwidth and most definitely succeeding in making my life difficult... I need to buy a decent cam!

anyway, give this a shot and let me know how it goes.

awesome, I will try it out tonight, I was able to work some more on it using a sony handicam at work, the nice part about that was that it could switch between b/w and color. I made some progress on understanding whats going on in the software as well. I saw the differences turning on and off the background and forground methods made, ect..

I will post more after i get it up and working tonight...