Depth Values of Z Axis per Pixel

Sinned800

Hello Guys,

im quite fresh in the processing world and no native speaker so please be gentle :)

but direct to the Point:

Im would like to know is there any possibilty to get an defined Z axis output of every pixel ? with the code below (copied from shiffman) i can get an matrix out of the kinect so is there any possibility to map every single pixel and send it to an arduino ?

        import org.openkinect.freenect2.*;
        import org.openkinect.processing.*; //<>//

        Kinect2 kinect2;

        void setup() {
          size(32, 16, P2D);
          kinect2 = new Kinect2(this);
          kinect2.initVideo();
          kinect2.initDepth();
        }


        void draw() {
          background(0);

    PImage img = kinect2.getDepthImage();
    //image(img, 0, 0);

    for (int x = 0; x < img.width; x++); {
    for (int y = 0; y < img.height; x++);{
    int index = x +y * img.widht;
    float b = brightness (img.pixels[index]);
    float z = map(b, 0, 255, 250, -250);
    fill(255-b);
    pushMatrix();
    translate( x, y, z);
    rect( 0, 0,skip/2,skip/2);
    popMatrix();
        }
      }
    }

koogs

widht

Spelling.

Line 21 is incrementing the wrong thing. y++

(I would have the y loop outermost, BTW)

img.pixels is the depth map. This appears to be in the range 0-255. Line 24 is remapping it.

Sinned800

Thanks for the correction I just wrote it quick down in text edit but your answer doesn't dsolve my problemm, I want the depth value of every single pixel so 512 values. Do you know a solution for this.

koogs

println(img.width, img.height);

what does that say?

Sinned800

I dont understand thr question

The Function is prints these values

And in the code its for looping through the pixels.

koogs

when you add that to your code and run it, what does it say?

Sinned800

thank you for your help koogs,really thank you very much

but i cant run the code right now, im in the office.

ill try it out later, last time i had some trouble with 21 now 23

      int index = x + y * img.width;

TAB 0,LN 22LN START OFF: 386,LN STOP OFF: 387,PROB: The variable "x" does not exist The variable "x" does not exist kinect1 23

koogs

for (int x = 0; x < img.width; x++); {
for (int y = 0; y < img.height; y++); {

remove the final ; on each of these lines.

Sinned800

all errors are solved code is running nice and smoth, if i println(img.width, img.height);

i get only the values 525,424 so the width and height.

i need to map the pixels and get the println on the depth values any idea how to achieve that ?

Sinned800

here is the working code:

Does somebody know how to get the values from specific pixels ?

import KinectPV2.*;
import org.openkinect.freenect.*;
import org.openkinect.freenect2.*;
import org.openkinect.processing.*;
import org.openkinect.tests.*;


Kinect2 kinect2;

void setup() {
  size(512, 424, P3D);
  kinect2 = new Kinect2(this);
  kinect2.initVideo();
  kinect2.initDepth();
  kinect2.initDevice();
}


void draw() {
  background(0);

  PImage img = kinect2.getDepthImage();
  //image(img, 0, 0);
  int  skip = 17;
  for (int x = 0; x < img.width; x+=skip) { //=skip
    for (int y = 0; y < img.height; y+=skip){ //=skip
      int index = x + y * img.width; // formel ist x+y+ width ergibt tiefen wert
      float b = brightness (img.pixels[index]);
      float z = map(b, 0, 255, 250, -250);
     fill(255-b);
     pushMatrix();
     translate( x, y, z);
     rect( 0, 0, skip/2, skip/2);
     popMatrix();
    }
 }
}

koogs

img.pixels[index]

this is your depth, per pixel. it's in the range 0 to 255.

Sinned800

i know i can achieve a "floating" value when i add println (x , y , z); so it loops truogh any "pixel" and gives me the Z value but is there a possibilty to get X and y straight so the only floating value is Z ?

koogs

is there a possibilty to get X and y straight so the only floating value is Z ?

i have no idea what you're asking here.

draw a picture? put up a screenshot of the result of the above code?

Sinned800

so i added println (x , y , z); to my code. now this addition prints me the following values in :

493 34 -48.039215
493 51 -69.60785
493 68 -99.01962
493 85 -122.54904
493 102 -169.60785
493 119 -214.70587
493 136 250.0
493 153 250.0
493 170 250.0
493 187 250.0
493 204 250.0
493 221 250.0
493 238 250.0
493 255 250.0
493 272 250.0
493 289 250.0
493 306 250.0
493 323 32.352936

Now its looping through x,y,z and i only would like to loop through z so i get an fixed value for x,y that it doenst look like this below it should look like

x     y     z
493 34 -48.039215
493 34 -50.039215
493 34 -20.039215

493 51 -09.60785
493 51 -19.60785
493 51 -99.60785

koogs

i only would like to loop through z

but there is only one value of z for each x,y position. it's not a 3d space, it's a 2d surface.

where are you getting those z values?

Sinned800

yes its only one Z value for each coordinate and i want to know exactly, this should be the only value that changes so i can send the Z values to my Arduino. i would like to know at any time which z Value X0 Y17 got or X500 Y35

what i image: i got a myPort.write (x =0 , y =0, z); so that x and y is fix and only z changes continously but that doesnt work... thats all i want

koogs

Yes, time is the other variable. Z at any position will change with time.

The code you have posted doesn't match the description in your last post. Please post the new code.