我正在使用 tesseract 在屏幕抓图上执行 OCR。我有一个使用 tkinter 窗口的应用程序，在我的类的初始化中利用 self.after 在 tkinter 窗口中执行恒定的图像抓取和更新标签等值。我已经搜索了多天，但找不到任何具体示例如何在使用 pytesseract 调用 tesseract 的 Windows 平台上将 CREATE_NO_WINDOW 与 Python3.6 结合使用。
这与这个问题有关：
使用 pytesser 运行 tesseract 时如何隐藏控制台窗口
我只用了 2 周的 Python 编程，不明白什么/如何执行上述问题中的步骤。我打开了 pytesseract.py 文件并查看并找到了 proc = subprocess.Popen(command, stderr=subproces.PIPE) 行，但是当我尝试对其进行编辑时，我遇到了一堆我无法弄清楚的错误。
#!/usr/bin/env python
'''
Python-tesseract. For more information: https://github.com/madmaze/pytesseract
'''
try:
import Image
except ImportError:
from PIL import Image
import os
import sys
import subprocess
import tempfile
import shlex
# CHANGE THIS IF TESSERACT IS NOT IN YOUR PATH, OR IS NAMED DIFFERENTLY
tesseract_cmd = 'tesseract'
__all__ = ['image_to_string']
def run_tesseract(input_filename, output_filename_base, lang=None, boxes=False,
config=None):
'''
runs the command:
`tesseract_cmd` `input_filename` `output_filename_base`
returns the exit status of tesseract, as well as tesseract's stderr output
'''
command = [tesseract_cmd, input_filename, output_filename_base]
if lang is not None:
command += ['-l', lang]
if boxes:
command += ['batch.nochop', 'makebox']
if config:
command += shlex.split(config)
proc = subprocess.Popen(command, stderr=subprocess.PIPE)
status = proc.wait()
error_string = proc.stderr.read()
proc.stderr.close()
return status, error_string
def cleanup(filename):
''' tries to remove the given filename. Ignores non-existent files '''
try:
os.remove(filename)
except OSError:
pass
def get_errors(error_string):
'''
returns all lines in the error_string that start with the string "error"
'''
error_string = error_string.decode('utf-8')
lines = error_string.splitlines()
error_lines = tuple(line for line in lines if line.find(u'Error') >= 0)
if len(error_lines) > 0:
return u'\n'.join(error_lines)
else:
return error_string.strip()
def tempnam():
''' returns a temporary file-name '''
tmpfile = tempfile.NamedTemporaryFile(prefix="tess_")
return tmpfile.name
class TesseractError(Exception):
def __init__(self, status, message):
self.status = status
self.message = message
self.args = (status, message)
def image_to_string(image, lang=None, boxes=False, config=None):
'''
Runs tesseract on the specified image. First, the image is written to disk,
and then the tesseract command is run on the image. Tesseract's result is
read, and the temporary files are erased.
Also supports boxes and config:
if boxes=True
"batch.nochop makebox" gets added to the tesseract call
if config is set, the config gets appended to the command.
ex: config="-psm 6"
'''
if len(image.split()) == 4:
# In case we have 4 channels, lets discard the Alpha.
# Kind of a hack, should fix in the future some time.
r, g, b, a = image.split()
image = Image.merge("RGB", (r, g, b))
input_file_name = '%s.bmp' % tempnam()
output_file_name_base = tempnam()
if not boxes:
output_file_name = '%s.txt' % output_file_name_base
else:
output_file_name = '%s.box' % output_file_name_base
try:
image.save(input_file_name)
status, error_string = run_tesseract(input_file_name,
output_file_name_base,
lang=lang,
boxes=boxes,
config=config)
if status:
errors = get_errors(error_string)
raise TesseractError(status, errors)
f = open(output_file_name, 'rb')
try:
return f.read().decode('utf-8').strip()
finally:
f.close()
finally:
cleanup(input_file_name)
cleanup(output_file_name)
def main():
if len(sys.argv) == 2:
filename = sys.argv[1]
try:
image = Image.open(filename)
if len(image.split()) == 4:
# In case we have 4 channels, lets discard the Alpha.
# Kind of a hack, should fix in the future some time.
r, g, b, a = image.split()
image = Image.merge("RGB", (r, g, b))
except IOError:
sys.stderr.write('ERROR: Could not open file "%s"\n' % filename)
exit(1)
print(image_to_string(image))
elif len(sys.argv) == 4 and sys.argv[1] == '-l':
lang = sys.argv[2]
filename = sys.argv[3]
try:
image = Image.open(filename)
except IOError:
sys.stderr.write('ERROR: Could not open file "%s"\n' % filename)
exit(1)
print(image_to_string(image, lang=lang))
else:
sys.stderr.write('Usage: python pytesseract.py [-l lang] input_file\n')
exit(2)
if __name__ == '__main__':
main()
我正在利用的代码类似于类似问题中的示例：
def get_string(img_path):
# Read image with opencv
img = cv2.imread(img_path)
# Convert to gray
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Apply dilation and erosion to remove some noise
kernel = np.ones((1, 1), np.uint8)
img = cv2.dilate(img, kernel, iterations=1)
img = cv2.erode(img, kernel, iterations=1)
# Write image after removed noise
cv2.imwrite(src_path + "removed_noise.png", img)
# Apply threshold to get image with only black and white
# Write the image after apply opencv to do some ...
cv2.imwrite(src_path + "thres.png", img)
# Recognize text with tesseract for python
result = pytesseract.image_to_string(Image.open(src_path + "thres.png"))
return result
当它到达下一行时，黑色控制台窗口会闪烁不到一秒钟，然后在运行命令时关闭。
result = pytesseract.image_to_string(Image.open(src_path + "thres.png"))
这是控制台窗口的图片：
这是另一个问题的建议：
您目前在 IDLE 中工作，在这种情况下，我认为弹出控制台窗口并不重要。如果您打算使用此库开发 GUI 应用程序，则需要修改 pytesser.py 中的 subprocess.Popen 调用以隐藏控制台。我首先尝试 CREATE_NO_WINDOW 进程创建标志。– 埃克森
对于如何使用 CREATE_NO_WINDOW 修改 pytesseract.py 库文件中的 subprocess.Popen 调用，我将不胜感激。我也不确定 pytesseract.py 和 pytesser.py 库文件之间的区别。我会在另一个问题上发表评论以要求澄清，但直到我在这个网站上获得更多声誉后我才能这样做。