/// <summary>
/// detect a grid within the given image using the given perimeter polygon
/// </summary>
/// <param name="img">image data</param>
/// <param name="img_width">width of the image</param>
/// <param name="img_height">height of the image</param>
/// <param name="bytes_per_pixel">number of bytes per pixel</param>
/// <param name="perimeter">bounding perimeter within which the grid exists</param>
/// <param name="spot_centres">previously detected spot centres</param>
/// <param name="minimum_dimension_horizontal">minimum number of cells across</param>
/// <param name="maximum_dimension_horizontal">maximum number of cells across</param>
/// <param name="minimum_dimension_vertical">minimum number of cells down</param>
/// <param name="maximum_dimension_vertical">maximum number of cells down</param>
/// <param name="known_grid_spacing">known grid spacing (cell diameter) value in pixels</param>
/// <param name="known_even_dimension">set to true if it is known that the number of cells in horizontal and vertical axes is even</param>
/// <param name="border_cells">extra cells to add as a buffer zone around the grid</param>
/// <param name="horizontal_scale_spacings">description used on the spacings diagram</param>
/// <param name="vertical_scale_spacings">description used on the spacings diagram</param>
/// <returns>2D grid</returns>
public static grid2D DetectGrid(byte[] img, int img_width, int img_height, int bytes_per_pixel,
polygon2D perimeter, ArrayList spot_centres,
int minimum_dimension_horizontal, int maximum_dimension_horizontal,
int minimum_dimension_vertical, int maximum_dimension_vertical,
float known_grid_spacing, bool known_even_dimension,
int border_cells,
String horizontal_scale_spacings, String vertical_scale_spacings,
ref float average_spacing_horizontal, ref float average_spacing_vertical,
ref byte[] output_img, int output_img_type)
{
int tx = (int)perimeter.left();
int ty = (int)perimeter.top();
int bx = (int)perimeter.right();
int by = (int)perimeter.bottom();
// adjust spot centre positions so that they're relative to the perimeter
// top left position
if (spot_centres != null)
{
for (int i = 0; i < spot_centres.Count; i += 2)
{
spot_centres[i] = (float)spot_centres[i] - tx;
spot_centres[i + 1] = (float)spot_centres[i + 1] - ty;
}
}
int wdth = bx - tx;
int hght = by - ty;
// create an image of the grid area
byte[] grid_img = image.createSubImage(img, img_width, img_height, bytes_per_pixel,
tx, ty, bx, by);
// get the orientation of the perimeter
float dominant_orientation = perimeter.GetSquareOrientation();
// find the horizontal and vertical dimensions of the grid perimeter
float grid_horizontal = perimeter.GetSquareHorizontal();
float grid_vertical = perimeter.GetSquareVertical();
// detect grid within the perimeter
int cells_horizontal = 0, cells_vertical = 0;
float horizontal_phase_offset = 0;
float vertical_phase_offset = 0;
if (spot_centres == null)
DetectGrid(grid_img, wdth, hght, bytes_per_pixel,
dominant_orientation, known_grid_spacing,
grid_horizontal, grid_vertical,
minimum_dimension_horizontal, maximum_dimension_horizontal,
minimum_dimension_vertical, maximum_dimension_vertical,
horizontal_scale_spacings, vertical_scale_spacings,
ref average_spacing_horizontal, ref average_spacing_vertical,
ref horizontal_phase_offset, ref vertical_phase_offset,
ref cells_horizontal, ref cells_vertical,
ref output_img, img_width, img_height, output_img_type);
else
DetectGrid(spot_centres, grid_img, wdth, hght, bytes_per_pixel,
dominant_orientation, known_grid_spacing,
grid_horizontal, grid_vertical,
minimum_dimension_horizontal, maximum_dimension_horizontal,
minimum_dimension_vertical, maximum_dimension_vertical,
horizontal_scale_spacings, vertical_scale_spacings,
ref average_spacing_horizontal, ref average_spacing_vertical,
ref horizontal_phase_offset, ref vertical_phase_offset,
ref cells_horizontal, ref cells_vertical,
ref output_img, img_width, img_height, output_img_type);
grid2D detectedGrid = null;
// apply some range limits
bool range_limited = false;
if (cells_horizontal < 3)
{
cells_horizontal = 3;
range_limited = true;
}
if (cells_vertical < 3)
{
cells_vertical = 3;
range_limited = true;
}
if (cells_horizontal > maximum_dimension_horizontal)
{
cells_horizontal = maximum_dimension_horizontal;
range_limited = true;
}
if (cells_vertical > maximum_dimension_vertical)
{
cells_vertical = maximum_dimension_vertical;
range_limited = true;
}
if (range_limited)
{
Console.WriteLine("WARNING: When detecting the grid the matrix dimension had to be artificially restricted.");
Console.WriteLine(" This probably means that there is a problem with the original image");
}
// if we know the number of cells should be even correct any inaccuracies
if (known_even_dimension)
{
cells_horizontal = (int)(cells_horizontal / 2) * 2;
cells_vertical = (int)(cells_vertical / 2) * 2;
}
// get the centre of the region
float cx = tx + ((bx - tx) / 2);
float cy = ty + ((by - ty) / 2);
detectedGrid = new grid2D(cells_horizontal, cells_vertical,
cx, cy, dominant_orientation,
average_spacing_horizontal, average_spacing_vertical,
horizontal_phase_offset, vertical_phase_offset,
border_cells);
return (detectedGrid);
}
