目录
- 腾讯云OCR服务二次开发
- 前言
- 安装SDK
- 调用API
- 学习API文档
- 通用印刷体识别API
- 代码
- main.py
- parse_args.py
- ocrtool.py
- 运行结果
- 本地图片
- 本地PDF
- 网络图片
- 问题整理
- 问题1：argparse模块参数之间如何生成依赖？
- 问题2：argparse模块parser的参数type是bool时，CLI中传入参数即使是False，也会认为是True？
- 问题3：bytes格式转化为str格式的方法：
- 后续想法
前言
因为腾讯云账户中还剩一点点钱，刚刚好够买腾讯云里文字识别服务，想着自己平时看PDF比较多，可以用这个服务来便捷的进行图像文字转换。我购买的是通用印刷体识别，即可以对图片进行识别，也可以对PDF文件进行识别。需要注意的的是，图片识别需要将图片转为Base64，PDF识别时每次只能识别一张。
本文记录了对腾讯云OCR服务二次开发的代码和开发过程中遇到的问题。
安装SDK
我使用的是Python 3.6，要使用腾讯云的OCR服务，要先在本地环境中安装腾讯云的SDK。安装方式见：Python - SDK 中心 - 腾讯云 (tencent.com)
调用API
学习API文档
安装好SDK后，调用相应的接口就ok了，可以参考：文字识别 API 概览 - 服务端 API 文档 - 文档中心 - 腾讯云 (tencent.com)
因为主要需求是对PDF以及其截图进行识别，我购买的是GeneralBasicOCR-通用印刷体识别，腾讯可以在API Explorer - 云 API - 控制台 (tencent.com)中进行调试，比较方便。
通用印刷体识别API
通用印刷体识别主要支持以下参数：
| 参数名称 | 必选 | 类型 | 描述 |
|---|---|---|---|
| Action | 是 | String | 公共参数，本接口取值：GeneralBasicOCR。 |
| Version | 是 | String | 公共参数，本接口取值：2018-11-19。 |
| Region | 是 | String | 公共参数，详见产品支持的 地域列表，本接口仅支持其中的: ap-beijing, ap-guangzhou, ap-hongkong, ap-seoul, ap-shanghai, ap-singapore, na-toronto |
| ImageBase64 | 否 | String | 图片/PDF的 Base64 值。 要求图片/PDF经Base64编码后不超过 7M，分辨率建议600*800以上，支持PNG、JPG、JPEG、BMP、PDF格式。 图片的 ImageUrl、ImageBase64 必须提供一个，如果都提供，只使用 ImageUrl。 |
| ImageUrl | 否 | String | 图片/PDF的 Url 地址。 要求图片/PDF经Base64编码后不超过 7M，分辨率建议600*800以上，支持PNG、JPG、JPEG、BMP、PDF格式。 图片存储于腾讯云的 Url 可保障更高的下载速度和稳定性，建议图片存储于腾讯云。非腾讯云存储的 Url 速度和稳定性可能受一定影响。 |
| Scene | 否 | String | 保留字段。 |
| LanguageType | 否 | String | 识别语言类型。 支持自动识别语言类型，同时支持自选语言种类，默认中英文混合(zh)，各种语言均支持与英文混合的文字识别。 可选值： zh：中英混合 zh_rare：支持英文、数字、中文生僻字、繁体字，特殊符号等 auto：自动 mix：混合语种 jap：日语 kor：韩语 spa：西班牙语 fre：法语 ger：德语 por：葡萄牙语 vie：越语 may：马来语 rus：俄语 ita：意大利语 hol：荷兰语 swe：瑞典语 fin：芬兰语 dan：丹麦语 nor：挪威语 hun：匈牙利语 tha：泰语 hi：印地语 ara：阿拉伯语 |
| IsPdf | 否 | Boolean | 是否开启PDF识别，默认值为false，开启后可同时支持图片和PDF的识别。 |
| PdfPageNumber | 否 | Integer | 需要识别的PDF页面的对应页码，仅支持PDF单页识别，当上传文件为PDF且IsPdf参数值为true时有效，默认值为1。 |
| IsWords | 否 | Boolean | 是否返回单字信息，默认关 |
考虑到我的实际使用需求，主要会使用到ImageBase64、ImageUrl、IsPdf、PdfPageNumber这几个参数。
代码
我主要使用了argparse、base64、json这几个python内置模块。
我希望能够在CLI中便捷的使用这个工具，但是由于有很多不同的情况，所以使用argparse模块，覆盖不同的情况。同时，又因为对图片识别时，参数是base64，所以需要使用base64模块将图片转化为base64格式。
main.py
parse_args.py
ocrtool.py
运行结果https://www.huoxing24.com/search/%E6%96%B0%E9%94%A6%E6%B1%9F%E7%BD%91%E5%9D%8019188306232zjs
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本地图片
使用-l参数（或者--local）表示对本地图片进行处理，使用-s（或者--newline）表示对图片中每行识别出来的内容进行换行。不使用-s时默认表示不换行。使用-c（或者--clip）表示将输出结果复制到粘贴板上，此时就可以方便的将输出的内容直接进行文本粘贴。
本地PDF
使用-p或者（--pdf）表示该文件是pdf文件，此时需要记得使用-n或者（--page）表示对哪一页进行OCR识别。否则的化会有报错提醒。
PS:如果需要对整个pdf进行识别和输出，可以重新进行函数封装，本文没有相关需求，暂不涉及。
网络图片
以下图为例：
它的url是：https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fww2.sinaimg.cn%2Fmw690%2F001SRYirly1h0czgvocbqj60uj0u043f02.jpg&refer=http%3A%2F%2Fwww.sina.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1652184476&t=f35c29a812ee6a9a8e8d8fd582e0b60f
我们复制图片url，使用-u（或者--url）表示对url进行处理，使用-s（或者--newline）表示对图片中每行识别出来的内容进行换行。
问题整理
问题1：argparse模块参数之间如何生成依赖？
使用if语句进行判断，不符合依赖条件则抛出错误。
# page参数和isPdf参数存在依赖
if args.isPdf and not args.page:
parser.print_help()
parser.error('The --isPdf argument requires the --page argument.')
问题2：argparse模块parser的参数type是bool时，CLI中传入参数即使是False，也会认为是True？
这是因为命令行传入的参数默认会认为是字符串格式，因此传参是False仍会认为是True。这个问题在argparse bool python - CSDN中有说明解决办法。我的解决办法是涉及到type是bool格式的，使用action参数进行判断。
parser.add_argument('-c', '--clip', required=False, action='store_true', help='输出结果是否粘贴到剪切板中')
问题3：bytes格式转化为str格式的方法：
str(encoded_string, 'UTF-8')
后续想法
-
封装函数对整个pdf进行处理并输出成文档(或EXCEL)
-
部署web服务器，在网页中进行操作OCR识别操作。
