1. API Description
Domain name for API request: ocr.tencentcloudapi.com.
This API is used to recognize a license plate attached to a motor vehicle in the Chinese mainland and return the regional code, license plate number, and license plate color.
A maximum of 10 requests can be initiated per second for this API.
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2. Input Parameters
The following request parameter list only provides API request parameters and some common parameters. For the complete common parameter list, see Common Request Parameters.
| Parameter Name | Required | Type | Description |
|---|---|---|---|
| Action | Yes | String | Common Params. The value used for this API: LicensePlateOCR. |
| Version | Yes | String | Common Params. The value used for this API: 2018-11-19. |
| Region | No | String | Common Params. This parameter is not required for this API. |
| ImageBase64 | No | String | The Base64-encoded value of the image. Supported image formats: PNG, JPG, and JPEG. GIF is currently not supported. Supported image size: The downloaded image after Base64 encoding can be up to 7 MB. The download time of the image cannot exceed 3s. Either ImageUrl or ImageBase64 of the image must be provided. If both are provided, only ImageUrl is used. |
| ImageUrl | No | String | The URL of the image. Supported image formats: PNG, JPG, and JPEG. GIF is currently not supported. Supported image size: The downloaded image after Base64 encoding can be up to 7 MB. The download time of the image cannot exceed 3s. We recommend that you store the image in Tencent Cloud for higher download speed and stability. The download speed and stability of non-Tencent Cloud URLs may be low. |
3. Output Parameters
| Parameter Name | Type | Description |
|---|---|---|
| Number | String | The recognized license plate number. |
| Confidence | Integer | The confidence score (0–100). |
| Rect | Rect | The bounding box coordinates of the text line in the original image. |
| Color | String | The recognized license plate color, which currently includes "white", "black", "blue", "green", "yellow", "yellow-green", and "temporary plate". |
| LicensePlateInfos | Array of LicensePlateInfo | The vehicle license plate information. |
| RequestId | String | The unique request ID, generated by the server, will be returned for every request (if the request fails to reach the server for other reasons, the request will not obtain a RequestId). RequestId is required for locating a problem. |
4. Example
Example1 Recognizing a vehicle license plate
This example shows you how to recognize a vehicle license plate.
Input Example
POST / HTTP/1.1
Host: ocr.tencentcloudapi.com
Content-Type: application/json
X-TC-Action: LicensePlateOCR
<Common request parameters>
{
"ImageUrl": "https://xx/a.jpg"
}
Output Example
{
"Response": {
"Color": "蓝",
"Confidence": 99,
"LicensePlateInfos": [
{
"Color": "蓝",
"Confidence": 99,
"Number": "京AF0236",
"Rect": {
"Height": 66,
"Width": 135,
"X": 426,
"Y": 423
}
}
],
"Number": "京AF0236",
"Rect": {
"Height": 66,
"Width": 135,
"X": 426,
"Y": 423
},
"RequestId": "5141467c-0a67-4f7c-b1c5-8147d84681a1"
}
}
5. Developer Resources
SDK
TencentCloud API 3.0 integrates SDKs that support various programming languages to make it easier for you to call APIs.
- Tencent Cloud SDK 3.0 for Python
- Tencent Cloud SDK 3.0 for Java
- Tencent Cloud SDK 3.0 for PHP
- Tencent Cloud SDK 3.0 for Go
- Tencent Cloud SDK 3.0 for Node.js
- Tencent Cloud SDK 3.0 for .NET
- Tencent Cloud SDK 3.0 for C++
Command Line Interface
6. Error Code
The following only lists the error codes related to the API business logic. For other error codes, see Common Error Codes.
| Error Code | Description |
|---|---|
| FailedOperation.DownLoadError | File download failed. |
| FailedOperation.ImageDecodeFailed | Image decoding failed. |
| FailedOperation.OcrFailed | OCR failed. |
| FailedOperation.UnKnowError | Unknown error. |
| FailedOperation.UnOpenError | The service is not activated. |
| InvalidParameterValue.InvalidParameterValueLimit | Incorrect parameter value. |
| LimitExceeded.TooLargeFileError | The file is too large. |
| ResourceUnavailable.InArrears | |
| ResourceUnavailable.ResourcePackageRunOut | |
| ResourcesSoldOut.ChargeStatusException | Exceptional billing status. |
Yes
No
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