/**
* Determines where captured pieces are
*
* @param in Mat image of the board
*/
public void findCaptured(Mat in) {
int vsegment = in.rows() / 8; // only accounts 8 playable
int hsegment = in.cols() / 12; // 8 playable, 2 capture, 2 extra
int offset; // offset for playable board
int capSquares = 12; // number of capture squares
int rowNum = 1; // starting row number for capture squares
int rightdx = 48;
int leftdx = 0;
offset = hsegment;
int count = 0;
// keep track of captured squares
// left: end user, right: system
for (int i = 0; i < capSquares; i++) {
// find where roi should be
Point p1 =
new Point(
offset + count * hsegment, rowNum * vsegment); // top left point of rectangle (x,y)
Point p2 =
new Point(
offset + (count + 1) * hsegment,
(rowNum + 1) * vsegment); // bottom right point of rectangle (x,y)
// create rectangle that is board square
Rect bound = new Rect(p1, p2);
char color;
// frame only includes rectangle
Mat roi = new Mat(in, bound);
// get the color
color = identifyColor(roi);
switch (color) {
case COLOR_BLUE:
// Imgproc.rectangle(in, p1, p2, new Scalar(255, 0, 0), 3);
Core.rectangle(in, p1, p2, new Scalar(255, 0, 0), 2);
captured[i] = 1;
break;
case COLOR_ORANGE:
// Imgproc.rectangle(in, p1, p2, new Scalar(0, 128, 255), 3);
Core.rectangle(in, p1, p2, new Scalar(0, 128, 255), 2);
captured[i] = 1;
break;
case COLOR_WHITE:
// Imgproc.rectangle(in, p1, p2, new Scalar(255, 255, 255), 3);
Core.rectangle(in, p1, p2, new Scalar(255, 255, 255), 2);
captured[i] = 0;
break;
case COLOR_BLACK:
// Imgproc.rectangle(in, p1, p2, new Scalar(0, 0, 0), 3);
Core.rectangle(in, p1, p2, new Scalar(255, 255, 255), 2);
captured[i] = 0;
break;
}
count++;
if (count == 1) {
offset = hsegment * 10 - rightdx;
} else if (count == 2) {
count = 0;
rightdx -= 6;
leftdx += 6;
offset = hsegment - leftdx;
rowNum++;
}
}
}
public void processWithContours(Mat in, Mat out) {
int playSquares = 32; // number of playable game board squares
// keep track of starting row square
int parity = 0; // 0 is even, 1 is odd, tied to row number
int count = 0; // row square
int rowNum = 0; // row number, starting at 0
int vsegment = in.rows() / 8; // only accounts 8 playable
int hsegment = in.cols() / 10; // 8 playable, 2 capture
int hOffset = hsegment * 2; // offset for playable board
int vOffset = vsegment + 40;
// For angle of camera
int dx = 80;
int ddx = 0;
hsegment -= 16;
int dy = 20;
vsegment -= 24;
int ddy = 0;
// Go through all playable squares
for (int i = 0; i < playSquares; i++) {
// change offset depending on the row
if (parity == 0) // playable squares start on 2nd square from left
{
if (rowNum >= 5) dx -= 3;
hOffset = hsegment * 2 + dx;
} else // playable squares start on immediate left
{
if (rowNum >= 5) dx -= 3;
hOffset = hsegment + dx;
}
if (rowNum == 0) ddy = 5;
if (rowNum == 4) if (count == 6) ddx = 10;
if (rowNum == 5) {
if (count == 0) ddx = -6;
else if (count == 2) ddx = 6;
else if (count == 4) ddx = 12;
else if (count == 6) ddx = 20;
}
if (rowNum == 6) {
if (count == 0) ddx = 0;
else if (count == 2) ddx = 16;
else if (count == 4) ddx = 32;
else if (count == 6) ddx = 40;
}
if (rowNum == 7) {
if (count == 0) ddx = 6;
else if (count == 2) ddx = 24;
else if (count == 4) ddx = 40;
else ddx = 52;
}
// find where roi should be
// System.out.println("" + vOffset);
Point p1 =
new Point(
hOffset + count * hsegment + ddx + 5,
vOffset + rowNum * vsegment - dy - 5 - ddy); // top left point of rectangle (x,y)
Point p2 =
new Point(
hOffset + (count + 1) * hsegment + ddx - 5,
vOffset
+ (rowNum + 1) * vsegment
- dy
- 5
- ddy); // bottom right point of rectangle (x,y)
// create rectangle that is board square
Rect bound = new Rect(p1, p2);
Mat roi;
char color;
if (i == 0) {
// frame only includes rectangle
roi = new Mat(in, bound);
// get the color
color = identifyColor(roi);
// copy input image to output image
in.copyTo(out);
} else {
// frame only includes rectangle
roi = new Mat(out, bound);
// get the color
color = identifyColor(roi);
}
Imgproc.cvtColor(roi, roi, Imgproc.COLOR_BGR2GRAY); // change to single color
Mat canny = new Mat();
Imgproc.Canny(roi, canny, 20, 40); // make image a canny image that is only edges; 2,4
// lower threshold values find more edges
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat hierarchy = new Mat(); // holds nested contour information
Imgproc.findContours(
canny,
contours,
hierarchy,
Imgproc.RETR_LIST,
Imgproc.CHAIN_APPROX_SIMPLE); // Imgproc.RETR_LIST, TREE
System.out.println(++test + "\t" + contours.size());
if (contours.size() > 3) // or error value for color is below 1
{
switch (color) {
case COLOR_BLUE:
// Imgproc.rectangle(out, p1, p2, new Scalar(255, 0, 0), 2);
Core.rectangle(out, p1, p2, new Scalar(255, 0, 0), 2);
board[i] = CheckersBoard.BLACK; // end user's piece
break;
case COLOR_ORANGE:
// Imgproc.rectangle(out, p1, p2, new Scalar(0, 128, 255), 2);
Core.rectangle(out, p1, p2, new Scalar(0, 128, 255), 2);
board[i] = CheckersBoard.WHITE; // system's piece
break;
case COLOR_WHITE:
// Imgproc.rectangle(out, p1, p2, new Scalar(255, 255, 255), 2);
Core.rectangle(out, p1, p2, new Scalar(255, 255, 255), 2);
board[i] = CheckersBoard.EMPTY;
break;
case COLOR_BLACK: // this is black
// Imgproc.rectangle(out, p1, p2, new Scalar(0, 0, 0), 2);
Core.rectangle(
out,
p1,
p2,
new Scalar(0, 0, 0),
2); // maybe add 8, 0 as line type and fractional bits
board[i] = CheckersBoard.EMPTY;
break;
}
}
System.out.println("in color switch " + board[i]);
count += 2;
if (count == 8) {
parity = ++parity % 2; // change odd or even
count = 0;
rowNum++;
hsegment += 2;
dx -= 10;
dy += 10;
vsegment += 3;
ddy = 0;
}
}
}
/**
* Identifies the color in the frame
*
* @param in the Mat image in the region of interest
* @return the color
*/
public char identifyColor(Mat in) {
// Mat blue = new Mat(in.rows(), in.cols(), CvType.CV_8UC1);
// Mat green = new Mat(in.rows(), in.cols(), CvType.CV_8UC1);
// Mat red = new Mat(in.rows(), in.cols(), CvType.CV_8UC1);
// split the channels of the image
Mat blue = new Mat(); // default is CV_8UC3
Mat green = new Mat();
Mat red = new Mat();
List<Mat> channels = new ArrayList<Mat>(3);
Core.split(in, channels);
blue = channels.get(0); // makes all 3 CV_8UC1
green = channels.get(1);
red = channels.get(2);
// System.out.println(blue.toString());
// add the intensities
Mat intensity = new Mat(in.rows(), in.cols(), CvType.CV_32F);
// Mat mask = new Mat();
Core.add(blue, green, intensity); // , mask, CvType.CV_32F);
Core.add(intensity, red, intensity); // , mask, CvType.CV_32F);
// not sure if correct from here to ...
Mat inten = new Mat();
Core.divide(intensity, Scalar.all(3.0), inten);
// System.out.println(intensity.toString());
// Core.divide(3.0, intensity, inten);
// if intensity = intensity / 3.0; means element-wise division
// use intensity.muls(Mat m)
// so make new Mat m of same size that has each element of 1/3
/*
* or
* About per-element division you can use Core.divide()
Core.divide(A,Scalar.all(d), B);
It's equivalent to B=A/d
*/
// find normalized values
Mat bnorm = new Mat();
Mat gnorm = new Mat();
Mat rnorm = new Mat();
// blue.convertTo(blue, CvType.CV_32F);
// green.convertTo(green, CvType.CV_32F);
// red.convertTo(red, CvType.CV_32F);
Core.divide(blue, inten, bnorm);
Core.divide(green, inten, gnorm);
Core.divide(red, inten, rnorm);
// find average norm values
Scalar val = new Scalar(0);
val = Core.mean(bnorm);
String value[] = val.toString().split(",");
String s = value[0].substring(1);
double bavg = Double.parseDouble(s);
val = Core.mean(gnorm);
String value1[] = val.toString().split(",");
String s1 = value1[0].substring(1);
double gavg = Double.parseDouble(s1);
val = Core.mean(rnorm);
String value2[] = val.toString().split(",");
String s2 = value2[0].substring(1);
double ravg = Double.parseDouble(s2);
// ... here
// original values
/*
// define the reference color values
//double RED[] = {0.4, 0.5, 1.8};
//double GREEN[] = {1.0, 1.2, 1.0};
double BLUE[] = {1.75, 1.0, 0.5};
//double YELLOW[] = {0.82, 1.7, 1.7};
double ORANGE[] = {0.2, 1.0, 2.0};
double WHITE[] = {2.0, 1.7, 1.7};
//double BLACK[] = {0.0, 0.3, 0.3};
*/
// define the reference color values
// double RED[] = {0.4, 0.5, 1.8};
// double GREEN[] = {1.0, 1.2, 1.0};
double BLUE[] = {1.75, 1.0, 0.5};
// double YELLOW[] = {0.82, 1.7, 1.7};
double ORANGE[] = {0.2, 1.0, 2.0};
double WHITE[] = {2.0, 1.7, 1.7};
// double BLACK[] = {0.0, 0.3, 0.3};
// compute the square error relative to the reference color values
// double minError = 3.0;
double minError = 2.0;
double errorSqr;
char bestFit = 'x';
// test++;
// System.out.print("\n\n" + test + "\n\n");
// check BLUE fitness
errorSqr = normSqr(BLUE[0], BLUE[1], BLUE[2], bavg, gavg, ravg);
System.out.println("Blue: " + errorSqr);
if (errorSqr < minError) {
minError = errorSqr;
bestFit = COLOR_BLUE;
}
// check ORANGE fitness
errorSqr = normSqr(ORANGE[0], ORANGE[1], ORANGE[2], bavg, gavg, ravg);
System.out.println("Orange: " + errorSqr);
if (errorSqr < minError) {
minError = errorSqr;
bestFit = COLOR_ORANGE;
}
// check WHITE fitness
errorSqr = normSqr(WHITE[0], WHITE[1], WHITE[2], bavg, gavg, ravg);
System.out.println("White: " + errorSqr);
if (errorSqr < minError) {
minError = errorSqr;
bestFit = COLOR_WHITE;
}
// check BLACK fitness
/*errorSqr = normSqr(BLACK[0], BLACK[1], BLACK[2], bavg, gavg, ravg);
System.out.println("Black: " + errorSqr);
if(errorSqr < minError)
{
minError = errorSqr;
bestFit = COLOR_BLACK;
}*/
// return the best fit color label
return bestFit;
}
/**
* Processes the board image
*
* @param in image captured of board
* @param out processed image of board
*/
public void processFrame(Mat in, Mat out) {
// multiple regions of interest
int playSquares = 32; // number of playable game board squares
// keep track of starting row square
int parity = 0; // 0 is even, 1 is odd, tied to row number
int count = 0; // row square
int rowNum = 0; // row number, starting at 0
int vsegment = in.rows() / 8; // only accounts 8 playable
int hsegment = in.cols() / 10; // 8 playable, 2 capture
int hOffset = hsegment * 2; // offset for playable board
int vOffset = vsegment + 40;
// For angle of camera
int dx = 80;
int ddx = 0;
hsegment -= 16;
int dy = 20;
vsegment -= 24;
// Go through all playable squares
for (int i = 0; i < playSquares; i++) {
// change offset depending on the row
if (parity == 0) // playable squares start on 2nd square from left
{
if (rowNum >= 5) dx -= 3;
hOffset = hsegment * 2 + dx;
} else // playable squares start on immediate left
{
if (rowNum >= 5) dx -= 3;
hOffset = hsegment + dx;
}
if (rowNum == 4) if (count == 6) ddx = 10;
if (rowNum == 5) {
if (count == 0) ddx = -6;
else if (count == 2) ddx = 6;
else if (count == 4) ddx = 12;
else if (count == 6) ddx = 20;
}
if (rowNum == 6) {
if (count == 0) ddx = 0;
else if (count == 2) ddx = 16;
else if (count == 4) ddx = 32;
else if (count == 6) ddx = 40;
}
if (rowNum == 7) {
if (count == 0) ddx = 0;
else if (count == 2) ddx = 24;
else if (count == 4) ddx = 40;
else ddx = 52;
}
// find where roi should be
// System.out.println("" + vOffset);
Point p1 =
new Point(
hOffset + count * hsegment + ddx,
vOffset + rowNum * vsegment - dy); // top left point of rectangle (x,y)
Point p2 =
new Point(
hOffset + (count + 1) * hsegment + ddx,
vOffset + (rowNum + 1) * vsegment - dy); // bottom right point of rectangle (x,y)
// create rectangle that is board square
Rect bound = new Rect(p1, p2);
char color;
if (i == 0) {
// frame only includes rectangle
Mat roi = new Mat(in, bound);
// get the color
color = identifyColor(roi);
// copy input image to output image
in.copyTo(out);
} else {
// frame only includes rectangle
Mat roi = new Mat(out, bound);
// get the color
color = identifyColor(roi);
}
// annotate the output image
// scalar values as (blue, green, red)
switch (color) {
case COLOR_BLUE:
// Imgproc.rectangle(out, p1, p2, new Scalar(255, 0, 0), 2);
Core.rectangle(out, p1, p2, new Scalar(255, 0, 0), 2);
board[i] = CheckersBoard.BLACK; // end user's piece
break;
case COLOR_ORANGE:
// Imgproc.rectangle(out, p1, p2, new Scalar(0, 128, 255), 2);
Core.rectangle(out, p1, p2, new Scalar(0, 128, 255), 2);
board[i] = CheckersBoard.WHITE; // system's piece
break;
case COLOR_WHITE:
// Imgproc.rectangle(out, p1, p2, new Scalar(255, 255, 255), 2);
Core.rectangle(out, p1, p2, new Scalar(255, 255, 255), 2);
board[i] = CheckersBoard.EMPTY;
break;
case COLOR_BLACK: // this is black
// Imgproc.rectangle(out, p1, p2, new Scalar(0, 0, 0), 2);
Core.rectangle(
out,
p1,
p2,
new Scalar(0, 0, 0),
2); // maybe add 8, 0 as line type and fractional bits
board[i] = CheckersBoard.EMPTY;
break;
}
count += 2;
if (count == 8) {
parity = ++parity % 2; // change odd or even
count = 0;
rowNum++;
hsegment += 2;
dx -= 10;
dy += 10;
vsegment += 3;
}
}
}