- Product Introduction
- Purchase Guide
- Operation Guide
- API Documentation
- FACEID Policy
- Product Introduction
- Purchase Guide
- Operation Guide
- API Documentation
- FACEID Policy
1. API Description
Domain name for API request: iai.tencentcloudapi.com.
This API is used to recognize top K persons in one or more groups who are similar to the person in a given image, display the results by group, and rank the similarity within each group in descending order.
Up to 10 faces in the image can be recognized at a time, and cross-group search is supported.
The maximum number of faces in groups that can be searched for at a time is subject to the group's algorithm model version (FaceModelVersion), which is 1 million for v2.0 or 3 million for v3.0.
This API recognizes each face image of a person as an independent one. By contrast, the SearchPersons and SearchPersonsReturnsByGroup APIs fuse the features of all face images of a person; for example, if a person has 4 face images, they will fuse the features of the 4 face images and generate the summarized facial features of the person to make the search more accurate.
This API should be used together with Group Management APIs.
- Please use the signature algorithm v3 to calculate the signature in the common parameters, that is, set the
SignatureMethodparameter toTC3-HMAC-SHA256.
- You cannot search for groups using different algorithm model versions (
FaceModelVersion) at a time.
We recommend you to use API Explorer
Try it
API Explorer provides a range of capabilities, including online call, signature authentication, SDK code generation, and API quick search. It enables you to view the request, response, and auto-generated examples.
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: SearchFacesReturnsByGroup. |
| Version | Yes | String | Common Params. The value used for this API: 2020-03-03. |
| Region | No | String | Common Params. This parameter is not required for this API. |
| GroupIds.N | Yes | Array of String | List of groups to be searched in (up to 60). The array element value is the GroupId in the CreateGroup API.You cannot search for groups using different algorithm model versions ( FaceModelVersion) at a time. |
| Image | No | String | Base64-encoded image data, which cannot exceed 5 MB. The long side cannot exceed 4,000 px for images in JPG format or 2,000 px for images in other formats. PNG, JPG, JPEG, and BMP images are supported, while GIF images are not. |
| Url | No | String | Image URL. The image cannot exceed 5 MB in size after being Base64-encoded. The long side cannot exceed 4,000 px for images in JPG format or 2,000 px for images in other formats. Either Url or Image must be provided; if both are provided, only Url will be used.We recommend storing the image in Tencent Cloud, as a Tencent Cloud URL can guarantee higher download speed and stability. The download speed and stability of non-Tencent Cloud URLs may be low. PNG, JPG, JPEG, and BMP images are supported, while GIF images are not. |
| MaxFaceNum | No | Integer | Maximum number of recognizable faces. Default value: 1 (i.e., detecting only the face with the largest size in the image). Maximum value: 10.MaxFaceNum is used to control the number of faces to be searched for if there are multiple faces in the input image to be recognized.For example, if the input image in Image or Url contains multiple faces and MaxFaceNum is 5, top 5 faces with the largest size in the image will be recognized. |
| MinFaceSize | No | Integer | Minimum height and width of face in px. Default value: 34. A value below 34 will affect the search accuracy. We recommend setting this parameter to 80. |
| MaxPersonNumPerGroup | No | Integer | Detected faces, which is corresponding to the maximum number of returned most matching persons. Default value: 5. Maximum value: 10. For example, if MaxFaceNum is 3, MaxPersonNumPerGroup is 5, and the GroupIds length is 3, up to 45 (3 * 5 * 3) persons will be returned. |
| NeedPersonInfo | No | Integer | Whether to return person details. 0: no; 1: yes. Default value: 0. Other values will be considered as 0 by default. |
| QualityControl | No | Integer | Image quality control. 0: no control. 1: low quality requirement. The image has one or more of the following problems: extreme blurriness, covered eyes, covered nose, and covered mouth. 2: average quality requirement. The image has at least three of the following problems: excessive brightness, excessive dimness, blurriness or average blurriness, covered eyebrows, covered cheeks, and covered chin. 3: high-quality requirement. The image has one to two of the following problems: excessive brightness, excessive dimness, average blurriness, covered eyebrows, covered cheeks, and covered chin. 4: very high-quality requirement. The image is optimal in all dimensions or only has a slight problem in one dimension. Default value: 0. If the image quality does not meet the requirement, the returned result will prompt that the detected image quality is unsatisfactory. |
| FaceMatchThreshold | No | Float | In the output parameter Score, the result will be returned only if the result value is greater than or equal to the FaceMatchThreshold value.Default value: 0. Value range: [0.0,100.0). |
| NeedRotateDetection | No | Integer | Whether to enable the support for rotated image recognition. 0: no; 1: yes. Default value: 0. When the face in the image is rotated and the image has no EXIF information, if this parameter is not enabled, the face in the image cannot be correctly detected and recognized. If you are sure that the input image contains EXIF information or the face in the image will not be rotated, do not enable this parameter, as the overall time consumption may increase by hundreds of milliseconds after it is enabled. |
3. Output Parameters
| Parameter Name | Type | Description |
|---|---|---|
| FaceNum | Integer | Number of faces included in searched groups. |
| ResultsReturnsByGroup | Array of ResultsReturnsByGroup | Recognition result. |
| FaceModelVersion | String | Algorithm model version used for face recognition. |
| RequestId | String | The unique request ID, which is returned for each request. RequestId is required for locating a problem. |
4. Example
Example1 Searching for faces with results returned by group
Input Example
POST / HTTP/1.1
Host: iai.tencentcloudapi.com
Content-Type: application/json
X-TC-Action: SearchFacesReturnsByGroup
<Common request parameters>
{
"Url": "http://test.image.myqcloud.com/testA.jpg",
"MaxPersonNumPerGroup": "5",
"GroupIds": [
"TencentShenZhenEmployee"
],
"MaxFaceNum": "1",
"MinFaceSize": "40"
}
Output Example
{
"Response": {
"FaceNum": 1,
"ResultsReturnsByGroup": [
{
"GroupCandidates": [
{
"Candidates": [
{
"PersonGroupInfos": [
{
"GroupId": "abc",
"PersonExDescriptions": [
"description1",
"description2"
]
}
],
"PersonId": "1001",
"Gender": 0,
"PersonName": "John Smith",
"Score": 100,
"FaceId": "2875093635484912302"
}
],
"GroupId": "Group1"
}
],
"FaceRect": {
"Y": 46,
"X": 370,
"Height": 1,
"Width": 1
},
"RetCode": 0
}
],
"RequestId": "57b42b73-b978-45b9-8095-8f50e9642d35",
"FaceModelVersion": "3.0"
}
}
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 NodeJS
- 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 |
|---|---|
| AuthFailure.InvalidAuthorization | Authentication failed. |
| FailedOperation.AcrossVersionsError | This operation cannot be performed across algorithm model versions. |
| FailedOperation.ConflictOperation | The operations conflict. Do not operate on the same person simultaneously. |
| FailedOperation.DuplicatedGroupDescription | The custom description field must be unique in the group. |
| FailedOperation.FaceSizeTooSmall | The face frame size is smaller than the MinFaceSize value, and the face is filtered out. |
| FailedOperation.GroupInDeletedState | The current group is being deleted. Please wait. |
| FailedOperation.GroupPersonMapExist | The ID of the corresponding person is already in the group. |
| FailedOperation.GroupPersonMapNotExist | The ID of the corresponding person is not in the group. |
| FailedOperation.ImageDecodeFailed | Image decoding failed. |
| FailedOperation.ImageDownloadError | An error occurred while downloading the image. |
| FailedOperation.ImageFacedetectFailed | Face detection failed. |
| FailedOperation.ImageResolutionExceed | The image resolution is too high. |
| FailedOperation.ImageResolutionTooSmall | The image short edge resolution is smaller than 64. |
| FailedOperation.ImageSizeExceed | The size of the Base64-encoded image cannot exceed 5 MB. |
| FailedOperation.RequestLimitExceeded | The request frequency exceeds the limit. |
| FailedOperation.RequestTimeout | The backend service timed out. |
| FailedOperation.SearchFacesExceed | The number of faces searched for exceeds the limit. |
| FailedOperation.ServerError | The algorithm service is exceptional. Please retry. |
| InternalError | Internal error. |
| InvalidParameter.InvalidParameter | Invalid parameter. |
| InvalidParameterValue.AccountFaceNumExceed | The number of faces in the account exceeds the limit. |
| InvalidParameterValue.DeleteFaceNumExceed | The number of faces to be deleted exceeds the limit. Every person must have at least one face image. |
| InvalidParameterValue.FaceMatchThresholdIllegal | Invalid FaceMatchThreshold parameter. |
| InvalidParameterValue.GroupExDescriptionsExceed | The array length of the group's custom description fields exceeds the limit. Up to 5 fields can be created. |
| InvalidParameterValue.GroupExDescriptionsNameIdentical | The name of the group's custom description field must be unique. |
| InvalidParameterValue.GroupExDescriptionsNameIllegal | The name of the group's custom description field contains invalid characters. It can contain only letters, -, _, and digits. |
| InvalidParameterValue.GroupExDescriptionsNameTooLong | The name of the group's custom description field exceeds the length limit. |
| InvalidParameterValue.GroupFaceNumExceed | The number of faces in the group exceeds the limit. |
| InvalidParameterValue.GroupIdAlreadyExist | The group ID already exists. It must be unique. |
| InvalidParameterValue.GroupIdIllegal | The group ID contains invalid characters. It can contain only letters, digits, and special symbols (-%@#&_). |
| InvalidParameterValue.GroupIdNotExist | The group ID does not exist. |
| InvalidParameterValue.GroupIdTooLong | The group ID exceeds the length limit. |
| InvalidParameterValue.GroupIdsExceed | The list of groups passed in exceeds the limit. |
| InvalidParameterValue.GroupNameAlreadyExist | The group name already exists. It must be unique. |
| InvalidParameterValue.GroupNameIllegal | The group name contains invalid characters. It can contain only letters, -, _, and digits. |
| InvalidParameterValue.GroupNameTooLong | The group name exceeds the length limit. |
| InvalidParameterValue.GroupNumExceed | The number of groups exceeds the limit. If you need more, please contact us. |
| InvalidParameterValue.GroupNumPerPersonExceed | The number of groups exceeds the limit. One person can be added to up to 100 groups. |
| InvalidParameterValue.GroupTagIllegal | The group remarks field contains invalid characters. It can contain only letters, -, _, and digits. |
| InvalidParameterValue.GroupTagTooLong | The group remarks field exceeds the length limit. |
| InvalidParameterValue.ImageEmpty | Empty image. |
| InvalidParameterValue.LimitExceed | The number of returned results exceeds the limit. |
| InvalidParameterValue.NoFaceInGroups | There are no faces in the specified group. |
| InvalidParameterValue.NoFaceInPhoto | There are no faces in the image. |
| InvalidParameterValue.OffsetExceed | The starting number is too large. Please check the length of the array to be requested. |
| InvalidParameterValue.PersonExDescriptionInfosExceed | The array length of the person's custom description fields exceeds the limit. Up to 5 fields are allowed. |
| InvalidParameterValue.PersonExDescriptionsNameIdentical | The name of the person's custom description field must be unique. |
| InvalidParameterValue.PersonExDescriptionsNameIllegal | The name of the person's custom description field contains invalid characters. It can contain only letters, -, _, and digits. |
| InvalidParameterValue.PersonExDescriptionsNameTooLong | The name of the person's custom description field exceeds the length limit. |
| InvalidParameterValue.PersonExistInGroup | The ID of the corresponding person is already in the group. |
| InvalidParameterValue.PersonFaceNumExceed | The number of face images for the person exceeds the limit. One person can have up to 5 face images. |
| InvalidParameterValue.PersonGenderIllegal | An error occurred while setting person gender. 0: empty; 1: male; 2: female. |
| InvalidParameterValue.PersonIdAlreadyExist | The person ID already exists. It must be unique. |
| InvalidParameterValue.PersonIdIllegal | The person ID contains invalid characters. It can contain only letters, digits, and -%@#&_. |
| InvalidParameterValue.PersonIdNotExist | The person ID does not exist. |
| InvalidParameterValue.PersonIdTooLong | The person ID field exceeds the length limit. |
| InvalidParameterValue.PersonNameIllegal | The person name contains invalid characters. It can contain only letters, -, _, and digits. |
| InvalidParameterValue.PersonNameTooLong | The person name exceeds the length limit. |
| InvalidParameterValue.QualityControlIllegal | Invalid QualityControl parameter. |
| InvalidParameterValue.SearchPersonsExceed | The number of persons searched for exceeds the limit. |
| InvalidParameterValue.UploadFaceNumExceed | Up to four faces can be uploaded at a time. |
| InvalidParameterValue.UrlIllegal | Invalid URL format. |
| LimitExceeded.ErrorFaceNumExceed | The number of faces exceeds the limit. |
| MissingParameter.ErrorParameterEmpty | A required parameter is empty. |
| ResourceUnavailable.Delivering | The resource is being shipped. |
| ResourceUnavailable.Freeze | The account is frozen. |
| ResourceUnavailable.InArrears | The account is in arrears. |
| ResourceUnavailable.NotExist | The billing status is unknown. Please check whether the service has been activated in the console. |
| ResourceUnavailable.Recover | The resource has been repossessed. |
| ResourceUnavailable.StopUsing | The service has been suspended for the account. |
| ResourceUnavailable.UnknownStatus | The billing status is unknown. |
| ResourcesSoldOut.ChargeStatusException | The billing status is exceptional. |
| UnsupportedOperation.UnknowMethod | Unknown method name. |
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