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Capture+contrast+mask+blur (Read 1391 times)
Dr. Strangecode
Capture+contrast+mask+blur
Jun 14th, 2009, 6:16pm  
Hi!
I'm pretty new to Processing and I'm doing my first project after playing around with examples for a while.

I want to add contrast to a live video capture and then apply a blur that is masked so that the middle of the image appear sharp.

I've succeeded in adding contrast and creating the masked blur effect but the problem is that I want to apply the contrast to the live input only and not the whole comp.

Link to image displaying the problem:
wdr.se/processing/problem01/mask+contrast_problem.jpg
(Sorry, I'm not allowed to post active links yet)

This is the code I'm using:

import processing.video.*;

Capture cam;

void setup() {
 size(640, 480);
 cam = new Capture(this, 640, 480);
 cam.frameRate(12);
}

void draw() {
 if (cam.available() == true) {
   cam.read();
   filter(BLUR,5);
   PImage maskImg = loadImage("hardmask_big.jpg");
   cam.mask(maskImg);
   image(cam, 0, 0);

 }
}

Ideas on how to make this work like frame 2 in the linked image and tips on how to make the code faster would be much appreciated.  

* Dr. Strangecode
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Vanishing Point
Re: Capture+contrast+mask+blur
Reply #1 - Jun 15th, 2009, 3:59am  
Problem is: you're masking on a loop, so the mask stays on, incrementally.
There is probably a better way to do this, but from the top of my head I would create 2 masks, one of them white (that would be a fake unmask) and do the following:

void draw(){
 if(cam.available()){
   cam.read();
   PImage maskImg = loadImage("unmask.jpg");
   cam.mask(maskImg);
   image(cam,0,0);
   filter(BLUR,5);
   maskImg = loadImage("mask.jpg");
   cam.mask(maskImg);
   image(cam,0,0);
 }
}

It is very slow,though, you'd gain extra speed by reading the cam on the capture event function:

void captureEvent(Capture cam){
 cam.read();
}

but you'd gain extra problems because captureEvent can occur mid-draw, between the two image calls.

I can't think of other simple solutions at the moment, only very elaborate and twisted ones, but I'll give this some extra thought as soon as I have some free time.
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Dr. Strangecode
Re: Capture+contrast+mask+blur
Reply #2 - Jun 15th, 2009, 9:40am  
Awesome!
I'll do a test and stay tuned.
* Dr. Strangecode
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