{
  "max_aspect_ratio": 1.90,
  "min_aspect_ratio": 1.00,
  "max_txt_aspect_ratio": 5,
  "min_txt_aspect_ratio": 1,
  "max_txt_area": 11000,
  "min_txt_area": 6000,

  "txt_box_contour_threshold": 170,
  "bilateral_filter_d": 11,
  "bilateral_filter_sigma_color": 17,
  "bilateral_filter_sigma_space": 17
}