OCR无法识别带有符号的电话号码（ - ）

Question

我正在尝试从以下图片中提取电话号码（调整大小后:)
我的代码：

from PIL import Image
from pyocr import pyocr
import pyocr.builders
import cStringIO
import os
os.putenv("TESSDATA_PREFIX", "/usr/share/tesseract-ocr/")
tools = pyocr.get_available_tools()
tool = tools[0]
langs = tool.get_available_languages()
lang = langs[0]
file = "test.png"
txt = tool.image_to_string(Image.open(file),
                           lang=lang,
                            builder=pyocr.builders.TextBuilder())
print txt

它返回空字符串。 当电话号码中没有（ - ）时，它会正确返回。 我该怎么办 ？ 谢谢！

Answer 1

好的，当我用tesseract和你提供的图像运行代码时，它完全返回了文本（包括破折号和空格）。那时你显然可以使用txt = txt.replace("-", "").replace(" ", "")来摆脱破折号和空白。

Buuuuuut我知道OCR（即使我们都使用tesseract）在不同平台上会有所不同，所以我已经包含了我的评论建议的一个例子。

首先我们在破折号处分割图像，然后我们读取每个分割图像，然后我们连接：

# I changed your imports a bit
from PIL import Image
from pyocr import pyocr
from pyocr import builders
import cStringIO
import os

# set up all your OCR stuff
os.putenv("TESSDATA_PREFIX", "/usr/share/tesseract-ocr/")
tools = pyocr.get_available_tools()
tool = tools[0]
langs = tool.get_available_languages()
lang = "eng" #set language to english to simplify things

# definte a function to return the text of a given image
def doOCR( fName ):
    txt = tool.image_to_string(Image.open(fName), lang=lang, builder=builders.TextBuilder())
    return txt

# define the path of the image we are going to read
path = "test.png"

# get the image dimensions
im = Image.open(path)
width, height = im.size

# define the points we want to split the image at
# these are the points where the dashes are
split_points = [119, 158]

# define the file names for the image parts
split_names = ["split-1.png", "split-2.png", "split-3.png"]

# define a function to crop the image and remove the dashes
def doCrop(imagePath, cropPath, x, y, x2, y2):
    im = Image.open(imagePath)
    box = (x, y, x2, y2)
    region = im.crop(box) # extract the box region
    region.save(cropPath) # save it as a separate image

# in the image you provided each "-" is ~10 pixels long
lenpix = 10

# crop the image at the split points
doCrop(path, split_names[0], 0, 0, split_points[0], height) # get the first section
doCrop(path, split_names[1], split_points[0] + lenpix, 0, split_points[1], height) # get the middle section
doCrop(path, split_names[2], split_points[1] + lenpix, 0, width, height) # get the final section

# define a variable for our final value
finalValue = ""

# finally iterate through split files
# and add the OCR results from each split together
for f in split_names:
    finalValue += doOCR(f) # concatenate the ocr value with the final
    os.remove(f) # remove the split file now that we've used it

# display the final value
print finalValue

对我来说就像一个魅力：

希望这有帮助！