public void reset() {
		double[][] map = new double[_source.length][_source[0].length];
		double scale = 1023.0 / (double) _maxValue;
		for (int i = 0; i < map.length; i++) {
			double[] row = map[i];
			for (int j = 0; j < row.length; j++) {
				map[i][j] = _source[i][j] * scale;
			}
		}
		_map = map;
	}