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Topic: Replicate / arraycopy (Read 654 times) |
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itpshiffman
 
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Replicate / arraycopy
« on: Apr 15th, 2004, 5:49pm » |
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Hello all,
I'm creating a simple example where a frame of live video is copied into a BImage at some given time (for example, on a mouse click).
For some reason, however, I can't get replicate or arraycopy to work with a reference to video.pixels. The same code works, however, if I copy from a BImage pixel array, i.e.
BImage myImage = loadImage("someimage");
BImage savedFrame = new BImage(w,h);
BeginVideo(w,h,#);
works:
savedFrame.replicate(myImage, 0, 0, myImage.width, myImage.height, 0, 0, savedFrame.width, savedFrame.height);
does not work:
savedFrame.replicate(video, 0, 0, video.width,video.height,0,0,savedFrame.width,savedFrame.height);
works:
System.arraycopy(myImage.pixels,0,savedFrame.pixels,0,myImage.pixels.len gth);
does not work:
System.arraycopy(video.pixels,0,savedFrame.pixels,0,video.pixels.length) ;
image(savedFrame,0,0);
Any suggestions would be greatly appreciated!
Best,
Dan
http://www.shiffman.net/
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| « Last Edit: Apr 15th, 2004, 5:49pm by itpshiffman » |
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toxi_
Guest
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Re: Replicate / arraycopy
« Reply #1 on: Apr 15th, 2004, 7:15pm » |
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hey dan, am not really sure why this wouldn't work for you. just did a little test myself and it seems to work fine...
Code:BImage img;
boolean newframe=false;
void setup() {
size(320,240);
beginVideo(width,height,8);
}
void loop() {
if (newframe) {
image(img,0,0);
}
}
void videoEvent() {
img=video.copy();
newframe=true;
} |
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even though i'm not using System.arraycopy() explicitly, it is used by the BImage.copy() method...
will dig deeper & keep you posted!
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itpshiffman
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Re: Replicate / arraycopy
« Reply #2 on: Apr 15th, 2004, 7:51pm » |
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I think there's perhaps something off w/ my machine / java environment, etc. Your example doesn't work either. . .
in fact, i got this error message:
java.lang.NullPointerException
at Temporary_109_4104.videoEvent(Temporary_109_4104.java:16)
at BVideo.run(BVideo.java:337)
at java.lang.Thread.run(Thread.java:536)
which would lead me to believe that something is wrong w/ video capturing locally. nevertheless, this works just fine:
BImage img;
boolean newframe=false;
void setup() {
size(320,240);
beginVideo(width,height, ;
}
void loop() {
if (newframe) {
image(video,0,0);
//image(img,0,0);
}
}
void videoEvent() {
//img=video.copy();
newframe=true;
}
d.
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