I am trying to follow this OpenCV exercise http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html but got stuck at the step to run mergevec.py (I use Python version instead of .cpp one). I have Python 3 instead of Python 2.x as in the article.
我正试图遵循这个OpenCV练习:http://codingrobin.de/2013/07/22/train-your-opencv -haar-classifier.html，但在运行mergevec的过程中遇到了问题。py(我使用Python版本而不是.cpp)。我有python3而不是python2。x和文章中的一样。
The source for this file is https://github.com/wulfebw/mergevec/blob/master/mergevec.py
该文件的源是https://github.com/wulfebw/mergevec/blob/master/mergevec.py。
The error I got was
我的错误是。
Traceback (most recent call last):
File "./tools/mergevec1.py", line 96, in <module>
merge_vec_files(vec_directory, output_filename)
File "./tools/mergevec1.py", line 45, in merge_vec_files
val = struct.unpack('<iihh', content[:12])
TypeError: a bytes-like object is required, not 'str'
I have tried to follow this python 3.5: TypeError: a bytes-like object is required, not 'str' when writing to a file and used open(f, 'r', encoding='utf-8', errors='ignore') but still no luck.
我试图遵循这条python 3.5: TypeError:需要一个字节类的对象，而不是在写入文件时使用“str”，并使用open(f， 'r'，编码='utf-8'， error ='ignore')，但仍然没有运气。
My modified code is below:
修改后的代码如下:
import sys
import glob
import struct
import argparse
import traceback
def exception_response(e):
exc_type, exc_value, exc_traceback = sys.exc_info()
lines = traceback.format_exception(exc_type, exc_value, exc_traceback)
for line in lines:
print(line)
def get_args():
parser = argparse.ArgumentParser()
parser.add_argument('-v', dest='vec_directory')
parser.add_argument('-o', dest='output_filename')
args = parser.parse_args()
return (args.vec_directory, args.output_filename)
def merge_vec_files(vec_directory, output_vec_file):
# Check that the .vec directory does not end in '/' and if it does, remove it.
if vec_directory.endswith('/'):
vec_directory = vec_directory[:-1]
# Get .vec files
files = glob.glob('{0}/*.vec'.format(vec_directory))
# Check to make sure there are .vec files in the directory
if len(files) <= 0:
print('Vec files to be mereged could not be found from directory: {0}'.format(vec_directory))
sys.exit(1)
# Check to make sure there are more than one .vec files
if len(files) == 1:
print('Only 1 vec file was found in directory: {0}. Cannot merge a single file.'.format(vec_directory))
sys.exit(1)
# Get the value for the first image size
prev_image_size = 0
try:
with open(files[0], 'r', encoding='utf-8', errors='ignore') as vecfile:
content = ''.join(str(line) for line in vecfile.readlines())
val = struct.unpack('<iihh', content[:12])
prev_image_size = val[1]
except IOError as e:
f = None
print('An IO error occured while processing the file: {0}'.format(f))
exception_response(e)
# Get the total number of images
total_num_images = 0
for f in files:
try:
with open(f, 'r', encoding='utf-8', errors='ignore') as vecfile:
content = ''.join(str(line) for line in vecfile.readlines())
val = struct.unpack('<iihh', content[:12])
num_images = val[0]
image_size = val[1]
if image_size != prev_image_size:
err_msg = """The image sizes in the .vec files differ. These values must be the same. \n The image size of file {0}: {1}\n
The image size of previous files: {0}""".format(f, image_size, prev_image_size)
sys.exit(err_msg)
total_num_images += num_images
except IOError as e:
print('An IO error occured while processing the file: {0}'.format(f))
exception_response(e)
# Iterate through the .vec files, writing their data (not the header) to the output file
# '<iihh' means 'little endian, int, int, short, short'
header = struct.pack('<iihh', total_num_images, image_size, 0, 0)
try:
with open(output_vec_file, 'wb') as outputfile:
outputfile.write(header)
for f in files:
with open(f, 'w', encoding='utf-8', errors='ignore') as vecfile:
content = ''.join(str(line) for line in vecfile.readlines())
data = content[12:]
outputfile.write(data)
except Exception as e:
exception_response(e)
if __name__ == '__main__':
vec_directory, output_filename = get_args()
if not vec_directory:
sys.exit('mergvec requires a directory of vec files. Call mergevec.py with -v /your_vec_directory')
if not output_filename:
sys.exit('mergevec requires an output filename. Call mergevec.py with -o your_output_filename')
merge_vec_files(vec_directory, output_filename)
Do you know what I did wrong? Thanks.
你知道我做错了什么吗?谢谢。
UPDATE 1
更新1
I did this:
我这样做:
content = b''.join(str(line) for line in vecfile.readlines())
I basically added "b" in front. However, now I got a different error:
我在前面加了b。然而，现在我有了一个不同的错误:
Traceback (most recent call last): File "./tools/mergevec1.py", line 97, in merge_vec_files(vec_directory, output_filename) File "./tools/mergevec1.py", line 44, in merge_vec_files content = b''.join(str(line) for line in vecfile.readlines()) TypeError: sequence item 0: expected a bytes-like object, str found
Traceback(最近的调用):File "./tools/mergevec1。第97行，在merge_vec_files(vec_directory, output_filename)文件中。/tools/mergevec1。第44行，在merge_vec_files内容= b .join(str(line)，在vecfile.readlines())类型错误:序列项0:预期一个字节类对象，str发现。
1 个解决方案
#1
2
Try changing this block of code as shown:
试着改变这段代码，如下所示:
for f in files:
try:
with open(f, 'rb') as vecfile:
content = vecfile.read()
val = struct.unpack('<iihh', content[:12])
num_images = val[0]
image_size = val[1]
if image_size != prev_image_size:
err_msg = """The image sizes in the .vec files differ. These values must be the same. \n The image size of file {0}: {1}\n
The image size of previous files: {0}""".format(f, image_size, prev_image_size)
sys.exit(err_msg)
total_num_images += num_images
except IOError as e:
print('An IO error occured while processing the file: {0}'.format(f))
exception_response(e)
#1
2
Try changing this block of code as shown:
试着改变这段代码，如下所示:
for f in files:
try:
with open(f, 'rb') as vecfile:
content = vecfile.read()
val = struct.unpack('<iihh', content[:12])
num_images = val[0]
image_size = val[1]
if image_size != prev_image_size:
err_msg = """The image sizes in the .vec files differ. These values must be the same. \n The image size of file {0}: {1}\n
The image size of previous files: {0}""".format(f, image_size, prev_image_size)
sys.exit(err_msg)
total_num_images += num_images
except IOError as e:
print('An IO error occured while processing the file: {0}'.format(f))
exception_response(e)