Carlo Alducente's Blog » BitmapData

AS3 Edge Detection Demo

alducente — Thu, 12 Nov 2009 01:04:57 +0000

So after posting about a technique to detect edges in AS3, I decided to take a little bit of time today to actually play with it. Check out the vid:

The demo used BitmapData along with the “difference” blendmode to extract the edges from the webcam feed. Using BitmapData’s hitTest method, I was able to check whether my sprite is hitting an edge. This was a pretty quick and simple demo (1hr and 147 lines of code! Woot!), so that I could actually see this thing in action. “Line Rider” anyone?

Flash Shape Detection

alducente — Wed, 11 Nov 2009 02:08:41 +0000

I’ve playing with a lot of motion/gesture detection in flash lately, and this week I got into some shape detection based on user input. In this demo, I used the “difference” blend mode to compare the user’s drawing with a bunch of vector shapes that I’ve baked in to the swf file.

Press down, drag, and release when your doodle is done. Try to draw the 4 shapes and test out its accuracy.

When you release the mouse, the shape it detects should light up, if it doesn’t recognize it then none of the 4 shapes should light up. What I like about this method is that you don’t need to “close” the shapes you draw. You can draw a spiral and it should detect that it’s a circle.

Demo: Playing with text.

alducente — Wed, 30 Sep 2009 03:28:34 +0000

I had a bit of a blast from the past earlier today while going through some old folders containing previous work and experiments. I came across a quick little demo I threw together in my early attempts of using TweenLite and the BitmapData class. Check it out below:

And I’m not quite sure why I did it, but I added a rollover effect on the dots as well…go ahead, put your mouse over those dots, you know you want to!

Looking back at this, and some recent BitmapData work, I’m getting a bit excited and starting to crave some more experimental work, I’ve already got a few ideas in mind! Superfluous rollover effects and all!

-Carlo

Interacting with the webcam

alducente — Tue, 25 Aug 2009 20:50:34 +0000

Last month, we decided to do some show-and-tell sessions at Zinc Roe where everyone had a chance to show some really cool stuff. My contribution was a little presentation on different ways to use the webcam to interact with flash applications. I had a blast reading up on some interesting webcam detection tutorials and articles, as well as putting some examples together myself.

Here are the topics I covered:

Camera.activityLevel – A brief explanation on using the Camera object’s activityLevel property
Bitmap.getPixel() – Using the BitmapData class to check for motion
Augmented Reality & Marker Tracking – What it is and how it can be used in different applications.
Moving MovieClips with your hand (or other limbs) using the webcam – An example of how you can use the motion detection stuff to move a MovieClip around the screen using only your hands and a webcam.

So check out my post over at the Metal Fish Eggs blog and let me know what you think!