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| ==Pixel Motion Detection -- File Input ==
| | Sein und Nichtsein, das ist immer die Antwort. |
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| <pre style="font=2">
| | == Idee == |
| import processing.video.*;
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| Movie cam;
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| PImage save, out;
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| //// threshold for fine-tuning and artefacts
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| float thresh = 2;
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| void setup() {
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| | == Hintergrund == |
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| ///change to your footage path
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| cam = new Movie(this, "E:/vids/MVI_5018.MOV");
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| cam.loop();
| | == Skizze == |
| cam.jump(random(cam.duration()));
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| cam.volume(0);
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| // set windows size to match footage resolution
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| size(cam.width, cam.height);
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| ///setup previous frame and output-image
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| save = createImage(cam.width, cam.height, RGB);
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| out = createImage(cam.width, cam.height, RGB);
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| }
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| void draw() {
| | [[Image:Af_bioart_tmp.png|700px]] |
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| loadPixels();
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| motiondetect();
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| out.updatePixels();
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| image(out, 0, 0, width, height);
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| }
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| void motiondetect() {
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| cam.loadPixels();
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| save.loadPixels();
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| ///scann through input pixels
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| for (int x = 0; x < cam.width; x ++ ) {
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| for (int y = 0; y < cam.height; y ++ ) {
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| int loc = y*cam.width+x;
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| color c = cam.pixels[loc];
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| color c_l = save.pixels[loc];
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| ///get colors of each pxl
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| float r = red(c);
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| float g = green(c);
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| float b = blue(c);
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| ///get colors of each pxl -> prev frame
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| float r_l = red(c_l);
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| float g_l = green(c_l);
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| float b_l = blue(c_l);
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| ///compare
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| float dif = dist(r, g, b, r_l, g_l, b_l);
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| ///exchange pxls to make change visible
| | == Misc == |
| if (dif>thresh) {
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| out.pixels[loc] = color (abs(r-r_l), abs(g-g_l), abs(b-b_l));
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| } else {
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| out.pixels[loc] = color (0);
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| }
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| }
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| }
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| }
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| | | [http://www.uni-weimar.de/medien/wiki/images/Drops_evalnature_color_trails.zip sketch for visual juicing] |
| void movieEvent(Movie m) {
| | [[File:Af_drops_simple_trails.png|720px|thumb|left|trails]] |
| | | [[File:Af_drops_color_corr.png|560px|thumb|left|color correction]] |
| ///get cam image and copy as previous frame
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| if (m.available()) {
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| save = m.get();
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| save.updatePixels();
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| m.read();
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| }
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| }
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| </pre>
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