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# author: wujiahao # last modified: 2021/11/5 # exdark has some .JPEG or .JPG
or .jpg or .png image ,but the responding ann txt is sometimes not correct in
name # so we should convert the image name first to unified .png, and also
convert the txt name # and select low light image w.r.t. imagecalsslist.txt #
and convert annotation format import os import cv2 import shutil import glob
data_root= '/data1/wjh/exdark' # anndir imgdir dst_path =
'/data1/wjh/exdark/exdark_vocformat2' annfold = 'anndir' imgfold = 'imgdir'
txtfile= 'imageclasslist.txt' class_folders = ['Bicycle', 'Boat', 'Bottle',
'Bus', 'Car', 'Cat', 'Chair', 'Cup', 'Dog', 'Motorbike', 'People', 'Table']
class_idx_dict= { 'Bicycle':1, 'Boat':3, 'Bottle':4, 'Bus':5, 'Car':6, 'Cat':7,
'Chair':8, 'Table':10, 'Dog':11, 'Motorbike':13, 'People':14, } ignore_class =
'Cup' with open(txtfile, 'r') as ftxt: lines = ftxt.readlines()[1:] for line in
lines: # each img words = line.split() img = words[0] class_folder =
class_folders[int(words[1])-1] file_prefix = img.split('.')[0] # copy img and
change suffix img_file_path = glob.glob(os.path.join(data_root, imgfold,
class_folder, file_prefix+'*'))[0] file_suffix = img_file_path.split('.')[-1]
h_img, w_img, c_img = cv2.imread(img_file_path).shape if file_suffix in ['jpg',
'JPG', 'JPEG']: shutil.copy(img_file_path, os.path.join(dst_path, file_prefix+
'.jpg')) else: shutil.copy(img_file_path, os.path.join(dst_path, file_prefix+
'.png')) # convert ann ann_file_path = glob.glob(os.path.join(data_root, annfold
, class_folder, file_prefix+'*'))[0] with open(ann_file_path, 'r') as f_in:
ann_lines= f_in.readlines()[1:] dst_file_path = os.path.join(dst_path,
file_prefix+ '.txt') with open(dst_file_path, 'w') as f_out: for ann_line in
ann_lines: # each obj in the img ann_words = ann_line.split() if ann_words[0] ==
ignore_class: continue class_idx = class_idx_dict[ann_words[0]] bbox =
ann_words[1:5] l,t,w,h = [float(bbox[i]) for i in range(4)] x_center, y_center,
w_bbox, h_bbox = (l+w/2)/w_img, (t+h/2)/h_img, w/w_img, h/h_img outline = f'{
class_idx} {x_center} {y_center} {w_bbox} {h_bbox}\n' f_out.write(outline) print
(img_file_path)