How to use AZURE face recognition Rest API? - php

Question

I am using Face API with curl in PHP. But I am having issue when matching images.
I am able to generate faceId's but when matching I get different results than expected. I have two images belonges to same person but API indicates that these images are different. But when using Microsoft demo to compare images I get right result.
Here is microsoft demo link:
https://azure.microsoft.com/en-in/services/cognitive-services/face/#demo
Here are My images url
$img1 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/1645715403_1.jpg";
$img2 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/3.png";
Here is my code
<?php
function compare($image1, $image2)
{
$faceid = array();
$images = array($image1 , $image2);
$headers = ["Ocp-Apim-Subscription-Key: ********* ","Content-Type:application/json" ];
/* Getting faceId */
foreach($images as $data)
{
/* First step is to detect face */
$request_url='https://nexever.cognitiveservices.azure.com/face/v1.0/detect?detectionModel=detection_03&returnFaceId=true&returnFaceLandmarks=false';
/* Image to get faceid */
$detect = array('url' => $data);
$curl = curl_init(); curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_URL, $request_url); curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($detect)); curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$strResponse = curl_exec($curl);
$curlErrno = curl_errno($curl);
if ($curlErrno) { $curlError = curl_error($curl);throw new Exception($curlError); }
$http_status = curl_getinfo($curl, CURLINFO_HTTP_CODE); curl_close($curl);
$strResponse = json_decode($strResponse , true);
print_r($strResponse);
array_push($faceid , $strResponse[0]['faceId']);
}
// comparing by face ID
/* Match face url */
$request_url = 'https://nexever.cognitiveservices.azure.com/face/v1.0/verify';
/* Face ID to compare */
print_r($faceid);
$match = array("faceId1"=>$faceid[0], "faceId2"=>$faceid[1],"maxNumOfCandidatesReturned" =>10,"mode"=> "matchFace");
$curl = curl_init(); curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_URL, $request_url); curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($match)); curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$strResponse = curl_exec($curl); $curlErrno = curl_errno($curl);
if ($curlErrno) {$curlError = curl_error($curl); throw new Exception($curlError); }
$http_status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
curl_close($curl);
return json_decode($strResponse, true);
}
$img1 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/1645715403_1.jpg";
$img2 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/3.png";
$ret = compare($img1, $img2);
//print_r($ret);
if(isset($ret['isIdentical']))
{
if($ret['isIdentical'] == 1)
{
echo "Same Person ";
}
else if($ret['isIdentical'] == 0)
{
echo "Different Person ";
}
}
?>
I have successfully got face id but unable to match. If I try some other images of same person it matches sometimes. The problem is result is not accurate.
but on microsoft demo it is working fine.

Answer 1

Pls try to use specify request param: recognitionModel=recognition_04 when you detect faces as official doc recommanded:
I modified your code as below, it works for me perfectly:
<?php
function compare($image1, $image2)
{
$faceid = array();
$images = array($image1 , $image2);
$faceAPIName = "nexever";
$apikey = "<your api key>";
$faceidAPIHost = "https://$faceAPIName.cognitiveservices.azure.com";
foreach($images as $data)
{
$detect = array('url' => $data);
$result = do_post("$faceidAPIHost/face/v1.0/detect?recognitionModel=recognition_04&detectionModel=detection_03",json_encode($detect),$apikey);
array_push($faceid , $result[0]['faceId']);
}
$request_url = "$faceidAPIHost/face/v1.0/verify";
/* Face ID to compare */
print_r($faceid);
$match = array("faceId1"=>$faceid[0], "faceId2"=>$faceid[1],"maxNumOfCandidatesReturned" =>10,"mode"=> "matchFace");
return do_post($request_url,json_encode($match),$apikey);
}
function do_post($url, $params,$key) {
$options = array(
'http' => array(
'header' => "Content-type: application/json\r\nOcp-Apim-Subscription-Key: $key",
'method' => 'POST',
'content' => $params
)
);
$result = file_get_contents($url, false, stream_context_create($options));
return json_decode($result, true);
}
$img1 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/1645715403_1.jpg";
$img2 = "http://nexever.in/LibTravelSuperAdmin/images/temporary/3.png";
$ret = compare($img1, $img2);
//print_r($ret);
if(isset($ret['isIdentical']))
{
if($ret['isIdentical'] == 1)
{
echo "Same Person ";
}
else if($ret['isIdentical'] == 0)
{
echo "Different Person ";
}
}
?>
Result of your code: