Exemplo n.º 1
0
  // +x is right
  // +y is down
  public double distanceOffset(double x, double y) {
    // Image height (px)
    double ih = Camera.RESOLUTION_Y_PIXELS;
    // Image width (px)
    double iw = Camera.RESOLUTION_X_PIXELS;
    // Signed distance from center, in y direction (px)
    double hv = y - ih / 2;
    // signed distance from center, in x direction (px)
    double xv = iw / 2 - x;

    // Field of view (rad)
    double fov = Camera.FOV_Y_RADIANS;
    // Distance to virtual image plane (px)
    double dv = (1.0 * ih) / (2 * Math.tan(fov / 2));

    // Height from camera to goal (in)
    double hr = 77.75;
    // Angle of inclination of the camera (rad)
    double ac = 41 * Math.PI / 180;

    // Distance offset from camera to center of rotation (in)
    double od = 12;
    // Horizontal offset from camera to center of rotation (in)
    double ox = 9.25;

    // Real distance from center of rotation to goal (in)
    double dr = hr / Math.tan(ac - Math.atan(hv / dv)) + od;

    // Real offset from center of rotation to goal (in)
    double xr = dr * xv / dv + ox;

    // Angle from center of rotation to goal (rad)
    double a = Math.atan(xr / dr);

    // Distance from center of rotation to goal (in)
    double d = Math.hypot(dr, xr);

    System.out.println("Real Angle: " + a * 180 / Math.PI);
    System.out.println("Real dist:  " + d);

    return a;
  }
Exemplo n.º 2
0
  private void targetAnalysis(
      PolygonCv foundTarget, boolean printToNetWorkTable) { // tells the robo info about the target
    double offsetXDegrees,
        offsetXDegreesIdeal,
        targetDistanceInches,
        baseDistanceInches,
        cameraAngleElevationRadians,
        targetAngleRadians,
        targetAngleFactor;

    // calculates how far off center the target is from the center of the camera
    // offsetXDegrees = Math.atan((400 - foundTarget.getCenterX()) *
    // Math.tan(Camera.FOV_X_RADIANS/2) / (Camera.RESOLUTION_X_PIXELS/2));
    offsetXDegrees =
        Math.atan(
            (400 - foundTarget.getMinX())
                * Math.tan(Camera.FOV_X_RADIANS / 2)
                / (Camera.RESOLUTION_X_PIXELS / 2));

    // converts from radians (output of Math) to degrees
    offsetXDegrees = Math.toDegrees(offsetXDegrees);

    // used to determine size of the target in radians
    targetAngleFactor = 2 * Math.tan(Camera.FOV_X_RADIANS / 2) / Camera.RESOLUTION_X_PIXELS;

    /*   	//gets size of target in Radians
        	targetAngleRadians = Math.atan(((Camera.RESOLUTION_X_PIXELS/2) - foundTarget.getMaxX()) * targetAngleFactor) -
        				  		 Math.atan(((Camera.RESOLUTION_X_PIXELS/2) - foundTarget.getMinX()) * targetAngleFactor);
        	//gets degree value of top and bottom points, and finds difference

        	//targetAngleRadians could be negative, compensates for this
        	targetAngleRadians = Math.abs(targetAngleRadians);

        	//gets distance to target
        	targetDistanceInches = (Target.TAPE_WIDTH_INCHES / 2) / Math.tan(targetAngleRadians);
    */
    // use perspective height rather than targetTapeHeight?

    // ye olde algorithm
    /*    	targetDistanceInches = (Target.TAPE_WIDTH_INCHES / 2) / Math.tan((Target.TAPE_WIDTH_INCHES / Camera.RESOLUTION_X_PIXELS) * (Camera.FOV_X_RADIANS / 2));
     */

    // new old algo
    double dpx = (Camera.RESOLUTION_X_PIXELS / 2) / Math.tan(Camera.FOV_X_RADIANS / 2);
    double tta = (foundTarget.getWidth() / 2) / dpx;
    targetDistanceInches = (Target.TAPE_WIDTH_INCHES) / Math.tan(tta);

    // System.out.println(dpx + " " + tta + " " + targetDistanceInches);

    // gets elevation of target to camera relative to ground
    cameraAngleElevationRadians =
        Math.asin((Target.TOWER_HEIGHT_INCHES - Camera.OFFSET_Y_INCHES) / targetDistanceInches);

    // gets distance to the base of the target
    baseDistanceInches = Math.cos(cameraAngleElevationRadians) * targetDistanceInches;

    /* gets 'ideal' target off center angle - because camera is to the side,
     * a perfectly zeroed robot will be slightly off from the camera
     */
    // if(Camera.OFFSET_X_INCHES != 0) {
    // offsetXDegreesIdeal = Math.toDegrees(Math.atan(targetDistanceInches /
    // Camera.OFFSET_X_INCHES));
    // } else { 								//will be positive if cameraCenterOffset is negative
    //	offsetXDegreesIdeal = 0;
    // }

    // compensates for Ideal angle offset
    // offsetXDegrees = offsetXDegrees - offsetXDegreesIdeal;

    double camAngle =
        fovCalc.pixelFromCenterToDeg(foundTarget.getCenterX() - (Camera.RESOLUTION_X_PIXELS / 2));
    double rot = -(robotAngleOffset - camAngle);

    // If rotation estimator enabled, use it as a better guess as how much to rotate
    if (rotEst != null) {
      // Guess at camera position somewhere between 75 and 120 inches from plane
      // containing target
      double distEst = (75 + 120) / 2;
      rot = rotEst.computeRotation(camAngle, distEst);
    }

    offsetXDegrees = rot; // TODO temporary substitution

    // determines if angle values are reasonable
    if (offsetXDegrees < (Camera.FOV_X_DEGREES / 2)
        && offsetXDegrees > (-Camera.FOV_X_DEGREES / 2)
        && printToNetWorkTable) {
      networkTable.putNumber(
          "OffCenterDegreesX",
          -Math.toDegrees(distanceOffset(foundTarget.getCenterX(), foundTarget.getCenterY())));
    }

    System.out.println("Angle: " + offsetXDegrees);

    // writes calculated data to network tables
    System.out.println("Distance: " + baseDistanceInches);
    if (printToNetWorkTable) {
      networkTable.putNumber("DistanceToBase", baseDistanceInches);
      networkTable.putNumber("DistanceToTarget", targetDistanceInches);
    }

    // Newest Algorithm
    distanceOffset(foundTarget.getCenterX(), foundTarget.getCenterY());
  }