utils.py 文件源码

def get_label_colortable(n_labels, shape):
    if cv2 is None:
        raise RuntimeError('get_label_colortable requires OpenCV (cv2)')
    rows, cols = shape
    if rows * cols < n_labels:
        raise ValueError
    cmap = label_colormap(n_labels)
    table = np.zeros((rows * cols, 50, 50, 3), dtype=np.uint8)
    for lbl_id, color in enumerate(cmap):
        color_uint8 = (color * 255).astype(np.uint8)
        table[lbl_id, :, :] = color_uint8
        text = '{:<2}'.format(lbl_id)
        cv2.putText(table[lbl_id], text, (5, 35),
                    cv2.cv.CV_FONT_HERSHEY_SIMPLEX, 0.8, (255, 255, 255), 3)
    table = table.reshape(rows, cols, 50, 50, 3)
    table = table.transpose(0, 2, 1, 3, 4)
    table = table.reshape(rows * 50, cols * 50, 3)
    return table


# -----------------------------------------------------------------------------
# Evaluation
# -----------------------------------------------------------------------------