Two new Capture examples from David Muth

java/libraries/video/examples/Capture/Spatiotemporal/Spatiotemporal.pde

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+/**
+ * Spatiotemporal
+ * by David Muth
+ * 
+ * Records a number of video frames into memory, then plays back the video
+ * buffer by turning the time axis into the x-axis and vice versa
+ */ 
+
+import processing.video.*;
+
+Capture video;
+int signal = 0;
+
+//the buffer for storing video frames
+ArrayList frames;
+
+//different program modes for recording and playback
+int mode = 0;
+int MODE_NEWBUFFER = 0;
+int MODE_RECORDING = 1;
+int MODE_PLAYBACK = 2;
+
+int currentX = 0;
+
+void setup() {
+  size(640, 480);
+  video = new Capture(this, width, height, 30);
+  video.start();
+}
+
+void captureEvent(Capture c) {
+  c.read();
+
+  //create a new buffer in case one is needed
+  if (mode == MODE_NEWBUFFER) {
+    frames = new ArrayList();
+    mode = MODE_RECORDING;
+  }
+
+  //record into the buffer until there are enough frames
+  if (mode == MODE_RECORDING) {
+    //copy the current video frame into an image, so it can be stored in the buffer
+    PImage img = createImage(width, height, RGB);
+    video.loadPixels();
+    arrayCopy(video.pixels, img.pixels);
+
+    frames.add(img);
+
+    //in case enough frames have been recorded, switch to playback mode
+    if (frames.size() >= width) {
+      mode = MODE_PLAYBACK;
+    }
+  }
+}
+
+void draw() { 
+  loadPixels();
+
+  //code for the recording mode 
+  if (mode == MODE_RECORDING) {
+    //set the image counter to 0
+    int currentImage = 0;
+
+    //begin a loop for displaying pixel columns
+    for (int x = 0; x < video.width; x++) {
+      //go through the frame buffer and pick an image using the image counter
+      if (currentImage < frames.size()) {
+        PImage img = (PImage)frames.get(currentImage);
+        
+        //display a pixel column of the current image
+        if (img != null) {
+          img.loadPixels();
+
+          for (int y = 0; y < video.height; y++) {
+            pixels[x + y * width] = img.pixels[x + y * video.width];
+          }  
+        }
+        
+        //increase the image counter
+        currentImage++;
+        
+      } 
+      else {
+        break;
+      }
+    }
+  }
+
+  //code for displaying the spatiotemporal transformation
+  if (mode == MODE_PLAYBACK) {  
+    
+    //begin a loop for displaying pixel columns
+    for (int x = 0; x < video.width; x++) {
+      //get an image from the buffer using loopcounter x as the index
+      PImage img = (PImage)frames.get(x);
+
+      if (img != null) {
+        img.loadPixels();
+        
+        //pick the same column from each image for display, 
+        //then distribute the columns over the x-axis on the screen
+        for(int y = 0; y < video.height; y++) {
+          pixels[x + y * width] = img.pixels[currentX + y * video.width];
+        }  
+      }
+    } 
+
+    //a different column shall be used next time draw() is being called
+    currentX++;
+    
+    //if the end of the buffer is reached
+    if(currentX >= video.width) {
+      //create a new buffer when the next video frame arrives
+      mode = MODE_NEWBUFFER;
+      //reset the column counter
+      currentX = 0;
+    }
+  }
+  
+  updatePixels();
+}
+
+
+
+
+

java/libraries/video/examples/Capture/TimeDisplacement/TimeDisplacement.pde

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+/**
+ * Time Displacement
+ * by David Muth 
+ * 
+ * Keeps a buffer of video frames in memory and displays pixel rows
+ * taken from consecutive frames distributed over the y-axis 
+ */ 
+ 
+import processing.video.*;
+
+Capture video;
+int signal = 0;
+
+//the buffer for storing video frames
+ArrayList frames = new ArrayList();
+
+void setup() {
+  size(640, 480);
+  video = new Capture(this, width, height, 30);
+  video.start();
+}
+
+void captureEvent(Capture camera) {
+  camera.read();
+  
+  //copy the current video frame into an image, so it can be stored in the buffer
+  PImage img = createImage(width, height, RGB);
+  video.loadPixels();
+  arrayCopy(video.pixels, img.pixels);
+  
+  frames.add(img);
+  
+  //once there are enough frames, remove the oldest one when adding a new one
+  if(frames.size() > height/4) {
+    frames.remove(0);
+  }
+}
+
+void draw() {
+ //set the image counter to 0
+ int currentImage = 0;
+ 
+ loadPixels();
+  
+  //begin a loop for displaying pixel rows of 4 pixels height
+  for(int y = 0; y < video.height; y+=4) {
+    //go through the frame buffer and pick an image, starting with the oldest one
+    if(currentImage < frames.size()) {
+      PImage img = (PImage)frames.get(currentImage);
+      
+      if(img != null) {
+        img.loadPixels();
+        
+        //put 4 rows of pixels on the screen
+        for(int x = 0; x < video.width; x++) {
+          pixels[x + y * width] = img.pixels[x + y * video.width];
+          pixels[x + (y + 1) * width] = img.pixels[x + (y + 1) * video.width];
+          pixels[x + (y + 2) * width] = img.pixels[x + (y + 2) * video.width];
+          pixels[x + (y + 3) * width] = img.pixels[x + (y + 3) * video.width];
+        }  
+      }
+      
+      //increase the image counter
+      currentImage++;
+       
+    } else {
+      break;
+    }
+  }
+  
+  updatePixels();
+  
+  //for recording an image sequence
+  //saveFrame("frame-####.jpg"); 
+}
+
+
+
+