阿里OCR识别（通用文字识别）

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阿里OCR识别（通用文字识别）

前言

通用文字识别

https://help.aliyun.com/zh/ocr/product-overview/common-character-recognition-1?spm=a2c4g.11186623.0.0.196c1613rFC7eC#topic-2084720

SDK文档

https://next.api.aliyun.com/api-tools/sdk/ocr-api?version=2021-07-07&language=csharp-tea&tab=primer-doc

在线测试-手写识别

https://next.api.aliyun.com/api/ocr-api/2021-07-07/RecognizeHandwriting?sdkStyle=dara

服务开通

https://ocr.console.aliyun.com/overview

注意

OCR统一识别 和 通用文字识别是不同的产品，注意开通的时候别选错了。

资源包可以买共享资源包，同时可用于OCR统一识别 和 通用文字识别

https://common-buy.aliyun.com/?spm=5176.23043878_1479102120.0.0.182e1cdcUlZNGP&commodityCode=ocr_share_dp_cn

C# 调用

安装依赖

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Install-Package AlibabaCloud.SDK.Ocr-api20210707 -Version 3.1.1

识别在线文件

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using System;

using AlibabaCloud.SDK.Ocr_api20210707.Models;

using Config;

using Tea;

public class AliOcrUtils {
  public static AlibabaCloud.SDK.Ocr_api20210707.Client CreateClient()
  {
    // 工程代码泄露可能会导致 AccessKey 泄露，并威胁账号下所有资源的安全性。以下代码示例仅供参考。
    // 建议使用更安全的 STS 方式，更多鉴权访问方式请参见：https://help.aliyun.com/document_detail/378671.html。
    AlibabaCloud.OpenApiClient.Models.Config config =
      new AlibabaCloud.OpenApiClient.Models.Config
    {
      AccessKeyId = ZConfig.ALIBABA_CLOUD_ACCESS_KEY_ID,
      AccessKeySecret = ZConfig.ALIBABA_CLOUD_ACCESS_KEY_SECRET,
    };
    // Endpoint 请参考 https://api.aliyun.com/product/ocr-api
    config.Endpoint = "ocr-api.cn-hangzhou.aliyuncs.com";
    return new AlibabaCloud.SDK.Ocr_api20210707.Client(config);
  }

  public static void Test()
  {
    AlibabaCloud.SDK.Ocr_api20210707.Client client = CreateClient();
    RecognizeHandwritingRequest recognizeBasicRequest = new RecognizeHandwritingRequest
    {
      Url =
        "https://img2.baidu.com/it/u=2401331858,865388201&fm=253&fmt=auto&app=138&f=JPEG?w=800&h=1093",
      NeedRotate = false,
    };
    try
    {
      // 复制代码运行请自行打印 API 的返回值
      RecognizeHandwritingResponse response = client.RecognizeHandwritingWithOptions(
        recognizeBasicRequest,
        new AlibabaCloud.TeaUtil.Models.RuntimeOptions()
      );
      if (response.Body.Code == null)
      {
        Console.WriteLine(response.Body.Data);
      }
    }
    catch (TeaException error)
    {
      Console.WriteLine(error.Message);
    }
    catch (Exception error)
    {
      Console.WriteLine(error.Message);
    }
  }
}

识别本地文件

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using System;
using System.IO;

using AlibabaCloud.SDK.Ocr_api20210707.Models;

using Config;

using Newtonsoft.Json.Linq;

using Tea;

public class AliOcrUtils
{
  public static AlibabaCloud.SDK.Ocr_api20210707.Client CreateClient()
  {
    AlibabaCloud.OpenApiClient.Models.Config config =
      new AlibabaCloud.OpenApiClient.Models.Config
    {
      AccessKeyId = ZConfig.ALIBABA_CLOUD_ACCESS_KEY_ID,
      AccessKeySecret = ZConfig.ALIBABA_CLOUD_ACCESS_KEY_SECRET,
    };
    // Endpoint 请参考 https://api.aliyun.com/product/ocr-api
    config.Endpoint = "ocr-api.cn-hangzhou.aliyuncs.com";
    return new AlibabaCloud.SDK.Ocr_api20210707.Client(config);
  }

  public static string RecognizeText(string filePath)
  {
    string result = "";
    AlibabaCloud.SDK.Ocr_api20210707.Client client = CreateClient();
    using (FileStream fileStream = new FileStream(
      filePath,
      FileMode.Open,
      FileAccess.Read
    ))
    {
      RecognizeHandwritingRequest recognizeBasicRequest = new RecognizeHandwritingRequest
      {
        Body = fileStream, NeedRotate = false,
      };
      try
      {
        // 复制代码运行请自行打印 API 的返回值
        RecognizeHandwritingResponse response = client.RecognizeHandwritingWithOptions(
          recognizeBasicRequest,
          new AlibabaCloud.TeaUtil.Models.RuntimeOptions()
        );
        if (response.Body.Code == null)
        {
          JObject jsonObject = JObject.Parse(response.Body.Data);
          if (jsonObject["content"] != null)
          {
            result = jsonObject["content"].ToString();
          }
        }
      }
      catch (TeaException error)
      {
        Console.WriteLine(error.Message);
      }
      catch (Exception error)
      {
        Console.WriteLine(error.Message);
      }
    }
    return result;
  }
}

调用

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string filePath = "C:\\Users\\Administrator\\Pictures\\test.jpg";
string recognizeText = AliOcrUtils.RecognizeText(filePath);
Console.WriteLine(recognizeText);

入参和回参

https://next.api.aliyun.com/api/ocr-api/2021-07-07/RecognizeHandwriting?sdkStyle=dara

字段名称 字段详情
RequestId 请求唯一 ID示例值:43A29C77-405E-4CC0-BC55-EE694AD00655
Data 返回数据示例值:{"content":"炼句 提问方式 1.请赏析诗歌某一联(句) 2.赏析某一联(句)的妙处 3.请赏析诗歌某、角度抒胸意、借景抒情、托物","height":1277,"orgHeight":1277,"orgWidth":1080,"prism_version":"1.0.9","prism_wnum":26,"prism_wordsInfo":[{"angle":-87,"direction":0,"height":83,"pos":[{"x":177,"y":56},{"x":260,"y":60},{"x":259,"y":88},{"x":176,"y":84}],"prob":96,"width":28,"word":"炼句","x":203,"y":30}],"width":1080}
Code 状态码示例值:200
Message 详细信息示例值:message

跟文档不一样的是

返回成功的时候Code不是200，而是null。

Python

安装依赖

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pip install alibabacloud_ocr_api20210707==3.1.2

识别在线图片

识别URL的图片

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# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import json
import os
import sys
from typing import List

from alibabacloud_ocr_api20210707 import models as ocr_api_20210707_models
from alibabacloud_ocr_api20210707.client import Client as ocr_api20210707Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient


class Sample:
    def __init__(self):
        pass

    @staticmethod
    def create_client() -> ocr_api20210707Client:
        """
        使用AK&SK初始化账号Client
        @return: Client
        @throws Exception
        """
        # 工程代码泄露可能会导致 AccessKey 泄露，并威胁账号下所有资源的安全性。以下代码示例仅供参考。
        # 建议使用更安全的 STS 方式，更多鉴权访问方式请参见：https://help.aliyun.com/document_detail/378659.html。
        config = open_api_models.Config(
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_ID。,
            access_key_id=os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"],
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_SECRET。,
            access_key_secret=os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"],
        )
        # Endpoint 请参考 https://api.aliyun.com/product/ocr-api
        config.endpoint = f"ocr-api.cn-hangzhou.aliyuncs.com"
        return ocr_api20210707Client(config)

    @staticmethod
    def main(
        args: List[str],
    ) -> None:
        client = Sample.create_client()
        recognize_basic_request = ocr_api_20210707_models.RecognizeBasicRequest(
            url="https://www.psvmc.cn/zjtools/z/ocr_imgs/img118.png", need_rotate=False
        )
        try:
            # 复制代码运行请自行打印 API 的返回值
            result = client.recognize_basic_with_options(
                recognize_basic_request, util_models.RuntimeOptions()
            )
            if result.status_code == 200:
                data_str = result.body.data
                json_obj = json.loads(data_str)
                print(json_obj["content"])
        except Exception as error:
            # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
            # 错误 message
            print(error.message)
            # 诊断地址
            print(error.data.get("Recommend"))
            UtilClient.assert_as_string(error.message)

    @staticmethod
    async def main_async(
        args: List[str],
    ) -> None:
        client = Sample.create_client()
        recognize_basic_request = ocr_api_20210707_models.RecognizeHandwritingRequest(
            url="https://www.psvmc.cn/zjtools/z/ocr_imgs/img118.png", need_rotate=False
        )
        try:
            # 复制代码运行请自行打印 API 的返回值
            result = await client.recognize_basic_with_options_async(
                recognize_basic_request, util_models.RuntimeOptions()
            )
            print(result)
        except Exception as error:
            # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
            # 错误 message
            print(error.message)
            # 诊断地址
            print(error.data.get("Recommend"))
            UtilClient.assert_as_string(error.message)


if __name__ == "__main__":
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"] = "xxx"
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"] = "xxx"
    Sample.main(sys.argv[1:])

识别本地文件

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# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import json
import os
import sys
from typing import List

from alibabacloud_ocr_api20210707 import models as ocr_api_20210707_models
from alibabacloud_ocr_api20210707.client import Client as ocr_api20210707Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient


class Sample:
    def __init__(self):
        pass

    @staticmethod
    def create_client() -> ocr_api20210707Client:
        """
        使用AK&SK初始化账号Client
        @return: Client
        @throws Exception
        """
        # 工程代码泄露可能会导致 AccessKey 泄露，并威胁账号下所有资源的安全性。以下代码示例仅供参考。
        # 建议使用更安全的 STS 方式，更多鉴权访问方式请参见：https://help.aliyun.com/document_detail/378659.html。
        config = open_api_models.Config(
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_ID。,
            access_key_id=os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"],
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_SECRET。,
            access_key_secret=os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"],
        )
        # Endpoint 请参考 https://api.aliyun.com/product/ocr-api
        config.endpoint = f"ocr-api.cn-hangzhou.aliyuncs.com"
        return ocr_api20210707Client(config)

    @staticmethod
    def main(
        args: List[str],
    ) -> None:
        with open(
            r"D:\Project\myblog\source\zjtools\z\ocr_imgs\img118.png", "rb"
        ) as image_file:
            # image_file 现在是一个 BinaryIO 对象
            client = Sample.create_client()
            recognize_basic_request = ocr_api_20210707_models.RecognizeHandwritingRequest(
                body=image_file,
                need_rotate=False,
            )
            try:
                # 复制代码运行请自行打印 API 的返回值
                result = client.recognize_basic_with_options(
                    recognize_basic_request, util_models.RuntimeOptions()
                )
                if result.status_code == 200:
                    data_str = result.body.data
                    json_obj = json.loads(data_str)
                    print(json_obj["content"])
            except Exception as error:
                # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
                # 错误 message
                print(error.message)
                # 诊断地址
                print(error.data.get("Recommend"))
                UtilClient.assert_as_string(error.message)


if __name__ == "__main__":
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"] = "xxx"
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"] = "xxx"
    Sample.main(sys.argv[1:])

识别PIL的Image对象

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# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import io
import json
import os
import sys
from typing import List

from alibabacloud_ocr_api20210707 import models as ocr_api_20210707_models
from alibabacloud_ocr_api20210707.client import Client as ocr_api20210707Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient
from PIL import Image


class Sample:
    def __init__(self):
        pass

    @staticmethod
    def create_client() -> ocr_api20210707Client:
        """
        使用AK&SK初始化账号Client
        @return: Client
        @throws Exception
        """
        config = open_api_models.Config(
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_ID。,
            access_key_id=os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"],
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_SECRET。,
            access_key_secret=os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"],
        )
        config.endpoint = f"ocr-api.cn-hangzhou.aliyuncs.com"
        return ocr_api20210707Client(config)

    @staticmethod
    def main(
        args: List[str],
    ) -> None:
        image = Image.open(r"D:\Project\myblog\source\zjtools\z\ocr_imgs\img118.png")
        # 将图像转换为灰度图像（如果需要）
        image = image.convert("L")
        # 创建一个BytesIO对象
        image_file = io.BytesIO()

        image.save(image_file, format="PNG")

        # 将指针移动到流的起始位置
        image_file.seek(0)

        client = Sample.create_client()
        recognize_basic_request = ocr_api_20210707_models.RecognizeHandwritingRequest(
            body=image_file,
            need_rotate=False,
        )
        try:
            # 复制代码运行请自行打印 API 的返回值
            result = client.recognize_basic_with_options(
                recognize_basic_request, util_models.RuntimeOptions()
            )
            if result.status_code == 200:
                data_str = result.body.data
                json_obj = json.loads(data_str)
                print(json_obj["content"])
        except Exception as error:
            # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
            # 错误 message
            print(error.message)
            # 诊断地址
            print(error.data.get("Recommend"))
            UtilClient.assert_as_string(error.message)


if __name__ == "__main__":
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"] = "xxx"
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"] = "xxx"
    Sample.main(sys.argv[1:])

识别OpenCV的numpy.ndarray

OpenCV加载图片后数据格式为numpy.ndarray，我们要把他转为需要的BinaryIO。

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# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import io
import json
import os
import sys
from typing import List

import cv2
import numpy as np
from alibabacloud_ocr_api20210707 import models as ocr_api_20210707_models
from alibabacloud_ocr_api20210707.client import Client as ocr_api20210707Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient


class Sample:
    def __init__(self):
        pass

    @staticmethod
    def read_img(filename, mode=cv2.IMREAD_COLOR):
        # 先用numpy把图片文件存入内存：raw_data，把图片数据看做是纯字节数据
        raw_data = np.fromfile(filename, dtype=np.uint8)
        img = cv2.imdecode(raw_data, mode)  # 从内存数据读入图片
        return img

    @staticmethod
    def create_client() -> ocr_api20210707Client:
        """
        使用AK&SK初始化账号Client
        @return: Client
        @throws Exception
        """
        config = open_api_models.Config(
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_ID。,
            access_key_id=os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"],
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_SECRET。,
            access_key_secret=os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"],
        )
        config.endpoint = f"ocr-api.cn-hangzhou.aliyuncs.com"
        return ocr_api20210707Client(config)

    @staticmethod
    def main(
        args: List[str],
    ) -> None:
        image = Sample.read_img(
            r"D:\Project\myblog\source\zjtools\z\ocr_imgs\img118.png"
        )

        # 使用 cv2.imencode() 将 numpy.ndarray 编码为 JPEG 格式的字节流
        success, buffer = cv2.imencode(".jpg", image)  # 可以选择其他格式，如 '.png'

        # 如果编码成功，将 buffer 转换为 bytes
        if success:
            image_bytes = buffer.tobytes()

            # 创建一个内存中的文件对象（BinaryIO 类型）
            image_file = io.BytesIO(image_bytes)

            # 将文件指针移到起始位置
            image_file.seek(0)

            client = Sample.create_client()
            recognize_basic_request = (
                ocr_api_20210707_models.RecognizeHandwritingRequest(
                    body=image_file,
                    need_rotate=False,
                )
            )
            try:
                # 复制代码运行请自行打印 API 的返回值
                result = client.recognize_basic_with_options(
                    recognize_basic_request, util_models.RuntimeOptions()
                )
                if result.status_code == 200:
                    data_str = result.body.data
                    json_obj = json.loads(data_str)
                    print(json_obj["content"])
            except Exception as error:
                # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
                # 错误 message
                print(error.message)
                # 诊断地址
                print(error.data.get("Recommend"))
                UtilClient.assert_as_string(error.message)


if __name__ == "__main__":
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"] = "xxx"
    os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"] = "xxx"
    Sample.main(sys.argv[1:])

工具类

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# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import io
import json
import os

import cv2
import numpy as np
from alibabacloud_ocr_api20210707 import models as ocr_api_20210707_models
from alibabacloud_ocr_api20210707.client import Client as ocr_api20210707Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient


class AliOcrUtils:
    def __init__(self):
        pass

    @staticmethod
    def create_client() -> ocr_api20210707Client:
        """
        使用AK&SK初始化账号Client
        @return: Client
        @throws Exception
        """
        config = open_api_models.Config(
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_ID。,
            access_key_id=os.environ["ALIBABA_CLOUD_ACCESS_KEY_ID"],
            # 必填，请确保代码运行环境设置了环境变量 ALIBABA_CLOUD_ACCESS_KEY_SECRET。,
            access_key_secret=os.environ["ALIBABA_CLOUD_ACCESS_KEY_SECRET"],
        )
        config.endpoint = f"ocr-api.cn-hangzhou.aliyuncs.com"
        return ocr_api20210707Client(config)

    @staticmethod
    def ocr_recognize(
        image: np.ndarray,
    ) -> str:
        # 使用 cv2.imencode() 将 numpy.ndarray 编码为 JPEG 格式的字节流
        success, buffer = cv2.imencode(".jpg", image)  # 可以选择其他格式，如 '.png'

        # 如果编码成功，将 buffer 转换为 bytes
        if success:
            image_bytes = buffer.tobytes()

            # 创建一个内存中的文件对象（BinaryIO 类型）
            image_file = io.BytesIO(image_bytes)

            # 将文件指针移到起始位置
            image_file.seek(0)

            client = AliOcrUtils.create_client()
            recognize_basic_request = (
                ocr_api_20210707_models.RecognizeHandwritingRequest(
                    body=image_file,
                    need_rotate=False,
                )
            )
            try:
                # 复制代码运行请自行打印 API 的返回值
                result = client.recognize_basic_with_options(
                    recognize_basic_request, util_models.RuntimeOptions()
                )
                if result.status_code == 200:
                    data_str = result.body.data
                    json_obj = json.loads(data_str)
                    return json_obj["content"]
            except Exception as error:
                # 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
                # 错误 message
                print(error.message)
                # 诊断地址
                print(error.data.get("Recommend"))
                UtilClient.assert_as_string(error.message)
                return ""