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Color Tracking with Multiple Cameras

[1 Reply]
- 18-Dec-2012 09:30 PM
- Forum: Core Library Questions
I have trying to get two USB cameras to track a specific color. This is going to be used for hand tracking, tip of a finger colored to track. The two cameras is to get three dimensional output, to control a robot arm. Yes, i know their is easer ways to control the arm, but I would like to use this method. Here is some example code if found to track colors, how do I go about using two cameras?
// Learning Processing

// Daniel Shiffman

// http://www.learningprocessing.com

// Example 16-11: Simple color tracking

import processing.video.*;

// Variable for capture device

Capture video;

// A variable for the color we are searching for.

color trackColor;

void setup() {

size(640,480);

video = new Capture(this, width, height,15);

// Start off tracking for red

trackColor = color(255,0,0);

video.start();

smooth();

}

void draw() {

// Capture and display the video

if (video.available()) {

video.read();

}

video.loadPixels();

image(video,0,0);

// Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.

float worldRecord = 500;

// XY coordinate of closest color

int closestX = 0;

int closestY = 0;

// Begin loop to walk through every pixel

for (int x = 0; x < video.width; x ++ ) {

for (int y = 0; y < video.height; y ++ ) {

int loc = x + y*video.width;

// What is current color

color currentColor = video.pixels[loc];

float r1 = red(currentColor);

float g1 = green(currentColor);

float b1 = blue(currentColor);

float r2 = red(trackColor);

float g2 = green(trackColor);

float b2 = blue(trackColor);

// Using euclidean distance to compare colors

float d = dist(r1,g1,b1,r2,g2,b2); // We are using the dist( ) function to compare the current color with the color we are tracking.

// If current color is more similar to tracked color than

// closest color, save current location and current difference

if (d < worldRecord) {

worldRecord = d;

closestX = x;

closestY = y;

}

}

}

println("x = " + closestX + " y = " + closestY);

// We only consider the color found if its color distance is less than 10.

// This threshold of 10 is arbitrary and you can adjust this number depending on how accurate you require the tracking to be.

if (worldRecord < 10) {

// Draw a circle at the tracked pixel

fill(trackColor);

strokeWeight(4.0);

stroke(0);

ellipse(closestX,closestY,16,16);

}

}

void mousePressed() {

// Save color where the mouse is clicked in trackColor variable

int loc = mouseX + mouseY*video.width;

trackColor = video.pixels[loc]; }

Here is what I tried to do.
2. // Learning Processing
3. // Daniel Shiffman
4. // http://www.learningprocessing.com
6. // Example 16-11: Simple color tracking
8. import processing.video.*;
10. // Variable for capture device
11. Capture video;
12. Capture video2;
13. // A variable for the color we are searching for.
14. color trackColor;
16. void setup() {
17. size(640,480);
18. video = new Capture(this, width, height,15);
19. // Start off tracking for red
20. trackColor = color(255,0,0);
21. video.start();
22. smooth();
24. size(640,480);
25. video2 = new Capture(this, width, height,15);
26. // Start off tracking for red
27. trackColor = color(255,0,0);
28. video2.start();
29. smooth();
30. }
32. void draw() {
33. // Capture and display the video
34. if (video.available()) {
35. video.read();
36. }
37. video.loadPixels();
38. image(video,0,0);
40. // Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.
41. float worldRecord = 500;
43. // XY coordinate of closest color
44. int closestX = 0;
45. int closestY = 0;
47. // Begin loop to walk through every pixel
48. for (int x = 0; x < video.width; x ++ ) {
49. for (int y = 0; y < video.height; y ++ ) {
50. int loc = x + y*video.width;
51. // What is current color
52. color currentColor = video.pixels[loc];
53. float r1 = red(currentColor);
54. float g1 = green(currentColor);
55. float b1 = blue(currentColor);
56. float r2 = red(trackColor);
57. float g2 = green(trackColor);
58. float b2 = blue(trackColor);
60. // Using euclidean distance to compare colors
61. float d = dist(r1,g1,b1,r2,g2,b2); // We are using the dist( ) function to compare the current color with the color we are tracking.
62. println("x = " + closestX + " y = " + closestY);
63. // If current color is more similar to tracked color than
64. // closest color, save current location and current difference
65. if (d < worldRecord) {
66. worldRecord = d;
67. closestX = x;
68. closestY = y;
69. }
70. }
72. //second camera below
73. if (video2.available()) {
74. video2.read();
75. }
76. video2.loadPixels();
77. image(video2,0,0);
79. // Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.
80. float worldRecord = 500;
82. // XY coordinate of closest color
83. int closestX2 = 0;
84. int closestY2 = 0;
86. // Begin loop to walk through every pixel
87. for (int x = 0; x < video2.width; x ++ ) {
88. for (int y = 0; y < video2.height; y ++ ) {
89. int loc = x + y*video2.width;
90. // What is current color
91. color currentColor2 = video2.pixels[loc];
92. float r1 = red(currentColor2);
93. float g1 = green(currentColor2);
94. float b1 = blue(currentColor2);
95. float r2 = red(trackColor);
96. float g2 = green(trackColor);
97. float b2 = blue(trackColor);
99. // Using euclidean distance to compare colors
100. float d = dist(r12,g12,b12,r22,g22,b22); // We are using the dist( ) function to compare the current color with the color we are tracking.
101. println("x2 = " + closestX2 + " y2 = " + closestY2);
102. // If current color is more similar to tracked color than
103. // closest color, save current location and current difference
104. if (d < worldRecord2) {
105. worldRecord2 = d;
106. closestX2 = x;
107. closestY2 = y;
108. }
109. }
110. }
112. // We only consider the color found if its color distance is less than 10.
113. // This threshold of 10 is arbitrary and you can adjust this number depending on how accurate you require the tracking to be.
114. if (worldRecord < 10) {
115. // Draw a circle at the tracked pixel
116. fill(trackColor);
117. strokeWeight(4.0);
118. stroke(0);
119. ellipse(closestX2,closestY2,16,16);
121. }
122. }
124. void mousePressed() {
125. // Save color where the mouse is clicked in trackColor variable
126. int loc = mouseX + mouseY*video.width;
127. trackColor = video.pixels[loc];
128. }
Here is the error i am getting
1. unexpected token: void
I am new to processing and java so this is most likely a stupid mistake, but any help would be appreciated.
~Thanks Idan

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