From 2f99676994bf063ac4beae7fa9315096a87457b4 Mon Sep 17 00:00:00 2001 From: Will Bradley Date: Fri, 13 Sep 2013 05:20:00 -0700 Subject: [PATCH] Initial commit --- light_painting.pde | 223 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 223 insertions(+) create mode 100644 light_painting.pde diff --git a/light_painting.pde b/light_painting.pde new file mode 100644 index 0000000..ce8e6cc --- /dev/null +++ b/light_painting.pde @@ -0,0 +1,223 @@ + +boolean debug = true; +int screenx = 1024; +int screeny = 768; +int camx = 640; +int camy = 480; +String camname = "/dev/video1"; // to adjust, uncomment the println(Capture.list()); line below and read the names on the console. + +// How different must a pixel be to be a "motion" pixel +float threshold = 50; +// How high of a color value must a pixel be to be a "draw" pixel +int highthreshold = 205; //0 = nothing, 255 = blue; // 0 = black, 765 = white +int whitethreshold = 254; //0 = nothing, 255 = blue; // 0 = black, 765 = white +int spread = 0; // width of threshold +int redspread = 80; // width of threshold +int greenspread = 0; // width of threshold +int bluespread = 40; // width of threshold +// How fast to fade out painting +int decay = 1; + + +import processing.video.*; +import gifAnimation.*; +// Variable for capture device +Capture video; +// Previous Frame +PImage prevFrame; +// DRAW Frame +PImage drawFrame; +// Black Frame +PImage blackFrame; + +// Pixel loop variables + int loc; + int screenloc,screenloc2,screenloc3,screenloc4,screenloc5,screenloc6,screenloc7,screenloc8,screenloc9; + color current; + color previous; + color mycolor; + float r1, r2, g1, g2, b1, b2; + float diff; + float videoscalex, videoscaley; + + +//boolean sketchFullScreen() { +// return true; +//} + +void setup() { + + //smooth(2); + size(screenx,screeny); + //println(Capture.list()); + video = new Capture(this, camx, camy, camname); + video.start(); + // Create an empty image the same size as the video + prevFrame = createImage(video.width,video.height,RGB); + // Create a drawing canvas the same size as the screen + drawFrame = createImage(width,height,RGB); + // Create a black frame to blend drawFrame with + blackFrame = createImage(width,height,RGB); + blackFrame.loadPixels(); + for (int i = 0; i < blackFrame.pixels.length; i++) { + blackFrame.pixels[i] = color(255-decay, 255-decay, 255-decay); + } + blackFrame.updatePixels(); + + videoscalex = float(screenx)/float(camx); + videoscaley = float(screeny)/float(camy); +} + +void draw() { + image(drawFrame,0,0); + drawFrame.blend(blackFrame,0,0,blackFrame.width,blackFrame.height,0,0,drawFrame.width,drawFrame.height,MULTIPLY); + + // Capture video + if (video.available()) { + // Save previous frame for motion detection!! + prevFrame.copy(video,0,0,video.width,video.height,0,0,video.width,video.height); // Before we read the new frame, we always save the previous frame for comparison! + prevFrame.updatePixels(); + video.read(); + } + + loadPixels(); + video.loadPixels(); + drawFrame.loadPixels(); + + // Begin loop to walk through every 4th pixel + for (int x = 0; x < video.width-1; x = x+4 ) { + for (int y = 0; y < video.height-1; y = y+4 ) { + + loc = x + y*video.width; // Step 1, what is the 1D pixel location + current = video.pixels[loc]; // Step 2, what is the current color + previous = prevFrame.pixels[loc]; // Step 3, what is the previous color + + // Step 4, compare colors (previous vs. current) + r1 = red(current); + g1 = green(current); + b1 = blue(current); + r2 = red(previous); + g2 = green(previous); + b2 = blue(previous); + diff = dist(r1,g1,b1,r2,g2,b2); + + // Step 5, How different are the colors? + // If the color at that pixel is bright blue, then there is a drawing tool at that pixel. + if (b1 > highthreshold || r1 > highthreshold || g1 > highthreshold) { + + // show webcam onscreen (2x2 pixels wide: + screenloc = width-int(x*videoscalex) + int(y*videoscaley)*width; // translate to a location onscreen so we can see + screenloc2 = width-int(x*videoscalex)+1 + int(y*videoscaley)*width; // translate to a location onscreen so we can see + screenloc3 = width-int(x*videoscalex)+2 + int(y*videoscaley)*width; // translate to a location onscreen so we can see + screenloc4 = width-int(x*videoscalex) + int((y*videoscaley)+1)*width; // translate to a location onscreen so we can see + screenloc5 = width-int(x*videoscalex) + int((y*videoscaley)+2)*width; // translate to a location onscreen so we can see + screenloc6 = width-int(x*videoscalex)+1 + int((y*videoscaley)+1)*width; // translate to a location onscreen so we can see + screenloc7 = width-int(x*videoscalex)+2 + int((y*videoscaley)+1)*width; // translate to a location onscreen so we can see + screenloc8 = width-int(x*videoscalex)+1 + int((y*videoscaley)+2)*width; // translate to a location onscreen so we can see + screenloc9 = width-int(x*videoscalex)+2 + int((y*videoscaley)+2)*width; // translate to a location onscreen so we can see + + boolean draw = false; + if(r1 > highthreshold && g1 < highthreshold-redspread && b1 < highthreshold-redspread){ mycolor = color(255,0,0); draw = true; } // 225, 160, 160 + if(g1 > highthreshold && r1 < highthreshold-spread && b1 < highthreshold-greenspread){ mycolor = color(0,255,0); draw = true; } // 211, 234, 120 + if(b1 > highthreshold && r1 < highthreshold-bluespread && g1 < highthreshold-spread){ mycolor = color(0,0,255); draw = true; } // 145, 239, 249 + if(b1 > whitethreshold && r1 > whitethreshold && b1 > whitethreshold){ mycolor = color(255,255,255); draw = true; } + if(draw){ + drawFrame.pixels[screenloc] = mycolor; + drawFrame.pixels[screenloc2] = mycolor; + drawFrame.pixels[screenloc3] = mycolor; + drawFrame.pixels[screenloc4] = mycolor; + drawFrame.pixels[screenloc5] = mycolor; + drawFrame.pixels[screenloc6] = mycolor; + drawFrame.pixels[screenloc7] = mycolor; + drawFrame.pixels[screenloc8] = mycolor; + drawFrame.pixels[screenloc9] = mycolor; + } + + } + // If the color at that pixel has changed, then there is motion at that pixel. + else if (diff > threshold) { + + // show webcam onscreen (2x2 pixels wide: + screenloc = width-int(x*videoscalex) + int(y*videoscaley)*width; // translate to a location onscreen so we can see + screenloc2 = width-int(x*videoscalex)+2 + int(y*videoscaley)*width; // translate to a location onscreen so we can see + screenloc3 = width-int(x*videoscalex) + int((y*videoscaley)+2)*width; // translate to a location onscreen so we can see + screenloc4 = width-int(x*videoscalex)+2 + int((y*videoscaley)+2)*width; // translate to a location onscreen so we can see + pixels[screenloc] = color(255,255,255); + pixels[screenloc2] = color(255,0,0); + pixels[screenloc3] = color(0,255,0); + pixels[screenloc4] = color(0,0,255); + + } + } + } + + updatePixels(); + drawFrame.updatePixels(); + + + if(debug){ + fill(255, 255, 255); + text("Threshold: "+threshold,40,40); + text("Highthreshold: "+highthreshold,40,60); + text("Whitethreshold: "+whitethreshold,40,80); + text("Spread: "+spread,40,100); + text("Redspread: "+redspread,40,110); + text("Greenspread: "+greenspread,40,120); + text("Bluespread: "+bluespread,40,130); + } +} + +void keyPressed() { + if (key == CODED) { + if (keyCode == UP) { + + } else if (keyCode == DOWN) { + + } + } + else if (key == 'd'){ + debug = !debug; + } + else if (key == 't'){ + threshold++; + } + else if (key == 'T'){ + threshold--; + } + else if (key == 'h'){ + highthreshold++; + } + else if (key == 'H'){ + highthreshold--; + } + else if (key == 'w'){ + whitethreshold++; + } + else if (key == 'W'){ + whitethreshold--; + } + else if (key == 's'){ + spread++; + } + else if (key == 'S'){ + spread--; + } + else if (key == 'r'){ + redspread++; + } + else if (key == 'R'){ + redspread--; + } + else if (key == 'g'){ + greenspread++; + } + else if (key == 'G'){ + greenspread--; + } + else if (key == 'b'){ + bluespread++; + } + else if (key == 'B'){ + bluespread--; + } +}