PImage to display video?

Contributed Library Questions

creativen

in Contributed Library Questions • 9 months ago

This is the code I modify to display depthImage, rgbImage, and the copy of rgbImage

import SimpleOpenNI.*;
SimpleOpenNI kinect;
color trackColor;
// Frame
PImage currentFrame;
PImage rgbImage;
void setup()
{
size(640*3, 480);
kinect = new SimpleOpenNI(this);
kinect.enableDepth();
kinect.enableRGB();
trackColor = color (255,0,0);
smooth ();
currentFrame = createImage (640,480, RGB);
}
void draw()
{
kinect.update();
PImage depthImage = kinect.depthImage();
PImage rgbImage = kinect.rgbImage();
image(depthImage, 0, 0);
image(rgbImage, 640, 0);
currentFrame.copy(kinect.rgbImage(),640,0,640,480,1280,0,640,480);
currentFrame.updatePixels();
loadPixels();
currentFrame.loadPixels();
image(currentFrame,1280,0);
}
void mousePressed(){
color c = get(mouseX, mouseY);
println("r: " + red(c) + " g: " + green(c) + " b: " + blue(c));
// Save color where the mouse is clicked in trackColor variable
int loc = mouseX + mouseY*width;
println(loc);
}

It shows this:

the code works for 1st and 2nd frame (which is DepthImage and RGBImage),

But I wonder why it display black at the 3rd Frame? Because I expect it display the copy of the 2nd frane (which is RGBImage).

Is there any wrong in my code?

I am using PImage to display video bcause I would like to use some of PImage methods (like pixels) which inspired from this simple motion detection code and single color tracking code:

http://www.learningprocessing.com/examples/chapter-16/example-16-11/

http://www.learningprocessing.com/examples/chapter-16/example-16-13/

The core of my modification is, I would like to track color but not using webcam, but using kinect cam.

Any reply or question for clarity, do not hesitate to ask.

Replies(5)

PhiLho

currentFrame.copy(kinect.rgbImage(),640,0,640,480,1280,0,640,480);
should probably be:
currentFrame.copy(kinect.rgbImage(),0,0,640,480,0,0,640,480);
You copy something beyond the width of the original image, to a position much beyond the width of the currentFrame...
Perhaps you intended to copy directly on screen or something, but don't forget you don't need offset in the PImages, they are standalone small chunks of image data, they don't need such offset, the offsets are used when displaying these images.

creativen

Re: Re: PImage to display video?

9 months ago

I think I have followed this http://processing.org/reference/PImage.html

Thank you for reply !

amnon.owed

Re: PImage to display video?

9 months ago

Double posts removed. Also your PImage copy question is not only a double post, but it has already been answered by PhiLho here. You are continuously using offsets which you don't need, read the reference and the above answer. In addition, if you want to copy the complete image you could also just use:

PImage someCopy = original.get();

creativen

Re: PImage to display video?

9 months ago

To PhiLho:

prevFrame.copy (source, x coordinate of source, y coordinate of source, width source, height source, x coordinate of destination, y coordinate of destination, width destination, height destination)
but why you suggest me this:
currentFrame.copy(kinect.rgbImage(),640,0,640,480,1280,0,640,480);
should probably be:
currentFrame.copy(kinect.rgbImage(),0,0,640,480,0,0,640,480);
what I plan to do is to copy rgbImage which locates at 640,0 to 1280,0
but your suggestion code is to copy rgbImage which locates at 0,0 to 0,0

Anw, what is offset?

PhiLho

Re: PImage to display video?

9 months ago

A PImage has internal coordinates starting at 0, 0 and going only to its width and height. You would use 640,0 to 1280,0 after it is displayed, when accessing the pixels on the screen, but here you access the pixels inside the PImage, so no offset is applied.
The offsets inside the PImage are zero, that's when you display it on the sketch that you use the offsets.

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