These services include the next features.
- OCR and text recognition (in an image).
- Image description.
- Image analysis.
- Tag an image.
The focus of this post is show how to work with image services from al BC365, or any system that only able API rest, systems that don´t able us to use third party libraries. It´s harder to access vision services because you must add to the body request a streamed image, instead a text.
Example: tag image service in the example.
First I select a picture in the page.
When I click process image, with tag method I get this response about the picture:
{
"tags": [
{
"name": "sky",
"confidence": 0.99999034404754639
},
{
"name": "person",
"confidence": 0.99938201904296875
},
{
"name": "outdoor",
"confidence": 0.99894469976425171
},
{
"name": "man",
"confidence": 0.99297571182250977
},
{
"name": "water",
"confidence": 0.979530930519104
},
{
"name": "human face",
"confidence": 0.96689260005950928
},
{
"name": "beach",
"confidence": 0.95207488536834717
},
{
"name": "clothing",
"confidence": 0.82670098543167114
},
{
"name": "shore",
"confidence": 0.15449938178062439
}
]
}
JSON response says picture contains a person face, outdoor and very likely in the beach.
Technical implementation.
Here in this post we can see Microsoft Artificial Intelligence connection basics explained:
But now the hard stuff is to upload the image in the body request. For this purpose, we do next code:
procedure GetAzureImageResp(Method: Text; InsStream: InStream) TextoRespuesta: Text;
var
ClienteHttp: HttpClient;
RequestEntity: HttpRequestMessage;
Cabecera: HttpHeaders;
Cabecera2: HttpHeaders;
Respuesta: HttpResponseMessage;
ReqBody: HttpContent;
url: Text;
begin
url := AzureURL + Method;
RequestEntity.SetRequestUri(Url);
RequestEntity.Method('POST');
RequestEntity.GetHeaders(Cabecera);
Cabecera.Add('Ocp-Apim-Subscription-Key', GetsubscriptionKey);
ReqBody.WriteFrom(InsStream);
ReqBody.GetHeaders(Cabecera2);
Cabecera2.Remove('Content-Type');
Cabecera2.Add('Content-Type', 'application/octet-stream');
RequestEntity.Content(ReqBody);
ClienteHttp.send(RequestEntity, Respuesta);
Respuesta.Content.ReadAs(TextoRespuesta);
end;
Comments.
- Url is a text constant https://westcentralus.api.cognitive.microsoft.com/vision/v2.0/
- Input parameter instream is the image into an instream variable.
- Method parameter is passed form the Page. In this example equals to “tag”.
Not a big piece of code but has been hard to find exactly all call parameters.
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