一、数据集
HWDB数据集是解压之后，是gnt格式的，不能可视化，如果需要显示的看到HWDB数据集，那么需要将gnt格式转换为png图片格式。
二、源码
import os
import numpy as np
import struct
from PIL import Image
data_dir = './data'
# train_data_dir = "../data/HWDB1.1trn_gnt"
train_data_dir = os.path.join(data_dir, 'HWDB1.1trn_gnt')
test_data_dir = os.path.join(data_dir, 'HWDB1.1tst_gnt')
def read_from_gnt_dir(gnt_dir=train_data_dir):
def one_file(f):
header_size = 10
while True:
header = np.fromfile(f, dtype='uint8', count=header_size)
if not header.size: break
sample_size = header[0] + (header[1]<<8) + (header[2]<<16) + (header[3]<<24)
tagcode = header[5] + (header[4]<<8)
width = header[6] + (header[7]<<8)
height = header[8] + (header[9]<<8)
if header_size + width*height != sample_size:
break
image = np.fromfile(f, dtype='uint8', count=width*height).reshape((height, width))
yield image, tagcode
for file_name in os.listdir(gnt_dir):
if file_name.endswith('.gnt'):
file_path = os.path.join(gnt_dir, file_name)
with open(file_path, 'rb') as f:
for image, tagcode in one_file(f):
yield image, tagcode
char_set = set()
for _, tagcode in read_from_gnt_dir(gnt_dir=train_data_dir):
tagcode_unicode = struct.pack('>H', tagcode).decode('gb2312')
char_set.add(tagcode_unicode)
char_list = list(char_set)
char_dict = dict(zip(sorted(char_list), range(len(char_list))))
print(len(char_dict))
print("char_dict=",char_dict)
import pickle
f = open('char_dict', 'wb')
pickle.dump(char_dict, f)
f.close()
train_counter = 0
test_counter = 0
for image, tagcode in read_from_gnt_dir(gnt_dir=train_data_dir):
tagcode_unicode = struct.pack('>H', tagcode).decode('gb2312')
im = Image.fromarray(image)
dir_name = './data/train/' + '%0.5d'%char_dict[tagcode_unicode]
if not os.path.exists(dir_name):
os.mkdir(dir_name)
im.convert('RGB').save(dir_name+'/' + str(train_counter) + '.png')
print("train_counter=",train_counter)
train_counter += 1
for image, tagcode in read_from_gnt_dir(gnt_dir=test_data_dir):
tagcode_unicode = struct.pack('>H', tagcode).decode('gb2312')
im = Image.fromarray(image)
dir_name = './data/test/' + '%0.5d'%char_dict[tagcode_unicode]
if not os.path.exists(dir_name):
os.mkdir(dir_name)
im.convert('RGB').save(dir_name+'/' + str(test_counter) + '.png')
print("test_counter=",test_counter)
test_counter += 1
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作者：蹦跶的小羊羔
来源：CSDN
原文：blog.csdn.net/yql_6175402…
版权声明：本文为博主原创文章，转载请附上博文链接！
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