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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import re
import sys
import shapely
from shapely.geometry import Polygon
import numpy as np
from collections import defaultdict
import operator
import editdistance
def strQ2B(ustring):
rstring = ""
for uchar in ustring:
inside_code = ord(uchar)
if inside_code == 12288:
inside_code = 32
elif (inside_code >= 65281 and inside_code <= 65374):
inside_code -= 65248
rstring += chr(inside_code)
return rstring
def polygon_from_str(polygon_points):
"""
Create a shapely polygon object from gt or dt line.
"""
polygon_points = np.array(polygon_points).reshape(4, 2)
polygon = Polygon(polygon_points).convex_hull
return polygon
def polygon_iou(poly1, poly2):
"""
Intersection over union between two shapely polygons.
"""
if not poly1.intersects(
poly2): # this test is fast and can accelerate calculation
iou = 0
else:
try:
inter_area = poly1.intersection(poly2).area
union_area = poly1.area + poly2.area - inter_area
iou = float(inter_area) / union_area
except shapely.geos.TopologicalError:
# except Exception as e:
# print(e)
print('shapely.geos.TopologicalError occurred, iou set to 0')
iou = 0
return iou
def ed(str1, str2):
return editdistance.eval(str1, str2)
def e2e_eval(gt_dir, res_dir, ignore_blank=False):
print('start testing...')
iou_thresh = 0.5
val_names = os.listdir(gt_dir)
num_gt_chars = 0
gt_count = 0
dt_count = 0
hit = 0
ed_sum = 0
for i, val_name in enumerate(val_names):
with open(os.path.join(gt_dir, val_name), encoding='utf-8') as f:
gt_lines = [o.strip() for o in f.readlines()]
gts = []
ignore_masks = []
for line in gt_lines:
parts = line.strip().split('\t')
# ignore illegal data
if len(parts) < 9:
continue
assert (len(parts) < 11)
if len(parts) == 9:
gts.append(parts[:8] + [''])
else:
gts.append(parts[:8] + [parts[-1]])
ignore_masks.append(parts[8])
val_path = os.path.join(res_dir, val_name)
if not os.path.exists(val_path):
dt_lines = []
else:
with open(val_path, encoding='utf-8') as f:
dt_lines = [o.strip() for o in f.readlines()]
dts = []
for line in dt_lines:
# print(line)
parts = line.strip().split("\t")
assert (len(parts) < 10), "line error: {}".format(line)
if len(parts) == 8:
dts.append(parts + [''])
else:
dts.append(parts)
dt_match = [False] * len(dts)
gt_match = [False] * len(gts)
all_ious = defaultdict(tuple)
for index_gt, gt in enumerate(gts):
gt_coors = [float(gt_coor) for gt_coor in gt[0:8]]
gt_poly = polygon_from_str(gt_coors)
for index_dt, dt in enumerate(dts):
dt_coors = [float(dt_coor) for dt_coor in dt[0:8]]
dt_poly = polygon_from_str(dt_coors)
iou = polygon_iou(dt_poly, gt_poly)
if iou >= iou_thresh:
all_ious[(index_gt, index_dt)] = iou
sorted_ious = sorted(
all_ious.items(), key=operator.itemgetter(1), reverse=True)
sorted_gt_dt_pairs = [item[0] for item in sorted_ious]
# matched gt and dt
for gt_dt_pair in sorted_gt_dt_pairs:
index_gt, index_dt = gt_dt_pair
if gt_match[index_gt] == False and dt_match[index_dt] == False:
gt_match[index_gt] = True
dt_match[index_dt] = True
if ignore_blank:
gt_str = strQ2B(gts[index_gt][8]).replace(" ", "")
dt_str = strQ2B(dts[index_dt][8]).replace(" ", "")
else:
gt_str = strQ2B(gts[index_gt][8])
dt_str = strQ2B(dts[index_dt][8])
if ignore_masks[index_gt] == '0':
ed_sum += ed(gt_str, dt_str)
num_gt_chars += len(gt_str)
if gt_str == dt_str:
hit += 1
gt_count += 1
dt_count += 1
# unmatched dt
for tindex, dt_match_flag in enumerate(dt_match):
if dt_match_flag == False:
dt_str = dts[tindex][8]
gt_str = ''
ed_sum += ed(dt_str, gt_str)
dt_count += 1
# unmatched gt
for tindex, gt_match_flag in enumerate(gt_match):
if gt_match_flag == False and ignore_masks[tindex] == '0':
dt_str = ''
gt_str = gts[tindex][8]
ed_sum += ed(gt_str, dt_str)
num_gt_chars += len(gt_str)
gt_count += 1
eps = 1e-9
print('hit, dt_count, gt_count', hit, dt_count, gt_count)
precision = hit / (dt_count + eps)
recall = hit / (gt_count + eps)
fmeasure = 2.0 * precision * recall / (precision + recall + eps)
avg_edit_dist_img = ed_sum / len(val_names)
avg_edit_dist_field = ed_sum / (gt_count + eps)
character_acc = 1 - ed_sum / (num_gt_chars + eps)
print('character_acc: %.2f' % (character_acc * 100) + "%")
print('avg_edit_dist_field: %.2f' % (avg_edit_dist_field))
print('avg_edit_dist_img: %.2f' % (avg_edit_dist_img))
print('precision: %.2f' % (precision * 100) + "%")
print('recall: %.2f' % (recall * 100) + "%")
print('fmeasure: %.2f' % (fmeasure * 100) + "%")
if __name__ == '__main__':
# if len(sys.argv) != 3:
# print("python3 ocr_e2e_eval.py gt_dir res_dir")
# exit(-1)
# gt_folder = sys.argv[1]
# pred_folder = sys.argv[2]
gt_folder = sys.argv[1]
pred_folder = sys.argv[2]
e2e_eval(gt_folder, pred_folder)
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