objectDetection

Author: hihozhou

objectDetection/cascadeClassifier.php

@@ -0,0 +1,87 @@
+<?php
+use CV\Mat;
+use CV\CascadeClassifier;
+use CV\Size;
+use CV\Point;
+use CV\Scalar;
+use CV\VideoCapture;
+use const CV\{
+    COLOR_BGR2GRAY, CASCADE_SCALE_IMAGE
+};
+use function CV\{
+    cvtColor, equalizeHist, ellipse, circle, imshow, waitKey
+};
+
+$face_cascade_name = "haarcascade_frontalface_alt.xml";
+$eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
+$face_cascade = new CascadeClassifier();
+$eyes_cascade = new CascadeClassifier();
+$window_name = "Capture - Face detection";
+
+function detectAndDisplay(Mat $frame)
+{
+    global $face_cascade;
+    global $eyes_cascade;
+    global $window_name;
+    $faces = [];
+    $frame_gray = null;
+    $frame_gray = cvtColor($frame, COLOR_BGR2GRAY);
+    equalizeHist($frame_gray, $frame_gray);
+    //-- Detect faces
+    $face_cascade->detectMultiScale($frame_gray, $faces, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, new Size(30, 30));
+    for ($i = 0; $i < count($faces); $i++) {
+        $center = new Point($faces[$i]->x + $faces[$i]->width / 2, $faces[$i]->y + $faces[$i]->height / 2);
+        ellipse($frame, $center, new Size($faces[$i]->width / 2, $faces[$i]->height / 2), 0, 0, 360, new Scalar(255, 0, 255), 4, 8, 0);
+        $faceROI = $frame_gray->getImageROI($faces[$i]);
+        $eyes = [];
+        //-- In each face, detect eyes
+        $eyes_cascade->detectMultiScale($faceROI, $eyes, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, new Size(30, 30));
+        for ($j = 0; $j < count($eyes); $j++) {
+            $eye_center = new Point ($faces[$i]->x + $eyes[$j]->x + $eyes[$j]->width / 2, $faces[$i]->y + $eyes[$j]->y + $eyes[$j]->height / 2);
+            $radius = round(($eyes[$j]->width + $eyes[$j]->height) * 0.25);
+            circle($frame, $eye_center, $radius, new Scalar(255, 0, 0), 4, 8, 0);
+        }
+    }
+    //-- Show what you got
+    imshow($window_name, $frame);
+}
+
+function run()
+{
+    global $face_cascade;
+    global $face_cascade_name;
+    global $eyes_cascade;
+    global $eyes_cascade_name;
+    $capture = new VideoCapture();
+    $frame = null;
+    //-- 1. Load the cascades
+    if (!$face_cascade->load($face_cascade_name)) {
+        printf("--(!)Error loading face cascade\n");
+        return -1;
+    };
+    if (!$eyes_cascade->load($eyes_cascade_name)) {
+        printf("--(!)Error loading eyes cascade\n");
+        return -1;
+    };
+    //-- 2. Read the video stream
+    $capture->open(-1);
+    if (!$capture->isOpened()) {
+        printf("--(!)Error opening video capture\n");
+        return -1;
+    }
+    while ($capture->read($frame)) {
+        if ($frame->empty()) {
+            printf(" --(!) No captured frame -- Break!");
+            break;
+        }
+        //-- 3. Apply the classifier to the frame
+        detectAndDisplay($frame);
+        $key = waitKey(10);
+        if ($key == 27) {
+            break;
+        } // escape
+    }
+    return 0;
+}
+
+run();