Function generate_tiles

extract_features.py:298–320

(tile_width_pix, tile_height_pix, img_width, img_height, offsets=[(0, 0)])

    return unary_union(polys)

def generate_tiles(tile_width_pix, tile_height_pix, img_width, img_height, offsets=[(0, 0)]):
    # Generate tiles covering the entire image.
    # Provide an offset (x,y) to create a stride-like overlap effect.
    # Add an additional tile size to the range stop to prevent tiles being cut off at the edges.
    range_stop_width = int(np.ceil(img_width + tile_width_pix))
    range_stop_height = int(np.ceil(img_height + tile_height_pix))

    rects = []
    for xmin, ymin in offsets:
        cols = range(int(np.floor(xmin)), range_stop_width, tile_width_pix)
        rows = range(int(np.floor(ymin)), range_stop_height, tile_height_pix)
        for x in cols:
            for y in rows:
                rect = Polygon(
                    [
                        (x, y),
                        (x + tile_width_pix, y),
                        (x + tile_width_pix, y - tile_height_pix),
                        (x, y - tile_height_pix),
                    ]
                )
                rects.append(rect)
    return rects

def make_tile_QC_fig(tiles, slide, level, line_width_pix=1, extra_tiles=None):
    # Render the tiles on an image derived from the specified zoom level