Rtwomey at 03:27, 26 May 2009

2009-05-26T03:27:31Z

Rtwomey: New page: This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming c...

2009-04-25T18:54:51Z

New page: This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming c...

New page

This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming course.

← Older revision		Revision as of 03:27, 26 May 2009
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	This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming course.		This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming course.
		+
		+	== histogram / auto-contrast ==
		+	processing code
		+
		+	<pre>
		+	PImage b, c;
		+	int x,y,n,w;
		+	int win_width;
		+	int win_height;
		+	int y_corner;
		+
		+	// parameters of auto-contrast window
		+	int ac_center=50;
		+	int ac_width=200;
		+
		+	void setup() {
		+	size(screen.width, screen.height);//, 800);
		+	//size(1200, 900);
		+	//b=loadImage("01_06_western landscape.jpg");
		+	//b=loadImage("/home/robert/Desktop/Photos/03_washington dc bedroom 2.jpg");
		+	//b=loadImage("C:\\Swap\\Photos\\03_washington dc bedroom 2.jpg");
		+	b=loadImage("C:\\Swap\\Photos\\01_06_western landscape.jpg");
		+	win_height=int(b.height*0.4);
		+	win_width=int(b.width0.4);//win_height/heightwidth);
		+	y_corner=0;//int((b.height-win_height)/2);
		+	//noLoop();
		+	x=0;
		+	y=0;
		+	w=0;
		+	n=0;
		+	frameRate(24);
		+	}
		+
		+	void auto_contrast(PImage in) {
		+	// adjust contrast in place on input image
		+	in.loadPixels();
		+	// loop over pixels to find min and max Intensity
		+	int dimension = (in.width*in.height);
		+	int [] hist = new int[256];
		+	for(int i=0;i<dimension;i++) {
		+	color argb=in.pixels[i];
		+
		+	int bin_a = argb & 0xFF000000;
		+	int r = (argb >> 16) & 0xFF; // Faster way of getting red(rgb)
		+	int g = (argb >> 8) & 0xFF; // Faster way of getting green(rgb)
		+	int b = argb & 0xFF; // Faster way of getting blue(rgb)
		+
		+	int intensity=int((r+g+b)/3);
		+
		+	hist[intensity]++;
		+	};
		+
		+	int i_min=0;
		+
		+	int sum=0;
		+	while(sum<4) {
		+	i_min++;
		+	sum+=hist[i_min];
		+	};
		+
		+	int i_max=256;
		+	sum=0;
		+	while(sum<4) {
		+	i_max--;
		+	sum+=hist[i_max];
		+	};
		+
		+	// loop over pixels to scale RGB to min and max Intensity
		+	for(int i=0;i<dimension;i++) {
		+	color argb=in.pixels[i];
		+
		+	//int a = (argb >> 24) & 0xFF;
		+	int bin_a = argb & 0xFF000000;
		+	int r = (argb >> 16) & 0xFF; // Faster way of getting red(rgb)
		+	int g = (argb >> 8) & 0xFF; // Faster way of getting green(rgb)
		+	int b = argb & 0xFF; // Faster way of getting blue(rgb)
		+
		+	// int ac_min=constrain(ac_center-(ac_width>>1), 0, 255);
		+	// int ac_max=constrain(ac_center+(ac_width>>1), 0, 255);
		+	// r=int(constrain(map(r, ac_min, ac_max, 0, 255), 0, 255));
		+	// g=int(constrain(map(g, ac_min, ac_max, 0, 255), 0, 255));
		+	// b=int(constrain(map(b, ac_min, ac_max, 0, 255), 0, 255));
		+
		+	r=int(constrain(map(r, i_min, i_max, 0, 255), 0, 255));
		+	g=int(constrain(map(g, i_min, i_max, 0, 255), 0, 255));
		+	b=int(constrain(map(b, i_min, i_max, 0, 255), 0, 255));
		+
		+	//a = a << 24;
		+	r = r << 16;
		+	g = g << 8;
		+	b = b;
		+	color new_rgb = bin_a \| r \| g \| b;
		+	in.pixels[i]= new_rgb;
		+	};
		+
		+	in.updatePixels();
		+	};
		+
		+	void draw() {
		+
		+	c = b.get(x, y+y_corner, win_width, win_height);
		+
		+	auto_contrast(c);
		+
		+	blend(c, 0, 0, win_width, win_height, 0, 0, width, height, BLEND);
		+	//blend(b, x, y+y_corner, (win_width), (win_height), 0, 0, width, height, BLEND);
		+
		+	//filter(ERODE);
		+	//saveFrame("/Volumes/Swimming Pool/Processing/west-#####.tif");
		+	saveFrame("C:\\Data\\01_06_western landscape/01_06_western landscape-#####.tif");
		+	//println(x+":"+b.width+" "+y+":"+b.height);
		+
		+	// update motion
		+	n++;
		+	x+=int(random(0, 5));
		+	if(x+win_width>b.width) exit();
		+	y=int(random(0,10));
		+	w=int(random(-5,0));
		+	}
		+
		+	void mouseMoved() {
		+	ac_center = int(255.0*float(mouseX)/float(width));
		+	ac_width= int(255.0*float(mouseY)/float(height));
		+	}
		+	</pre>

Advanced Video Processing - Revision history

Rtwomey at 03:27, 26 May 2009

Rtwomey: New page: This course covers topics in computer vision, procedural/generative video, high-resolution video, and media presentation through the use of computational tools. It is also a programming c...