Scripts test liveview : pygame, pyqt6, opencv, tkinter - mesure FPS et premiere image

scripts/test_opencv.py

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+#!/usr/bin/env python3
+"""Test liveview avec OpenCV. Lance: DISPLAY=:0 python3 scripts/test_opencv.py"""
+import time
+import io
+import numpy as np
+import cv2
+import gphoto2 as gp
+
+cam = gp.Camera()
+cam.init()
+print("Camera connectee")
+
+t_start = time.time()
+frame_count = 0
+premier_frame = None
+
+print("Appuie sur ESC pour quitter")
+while True:
+    try:
+        t0 = time.time()
+        f = cam.capture_preview()
+        data = bytes(f.get_data_and_size())
+        dt = time.time() - t0
+
+        if premier_frame is None:
+            premier_frame = time.time() - t_start
+            print(f"1ere image en : {premier_frame:.2f}s")
+
+        arr = np.frombuffer(data, dtype=np.uint8)
+        img = cv2.imdecode(arr, cv2.IMREAD_COLOR)
+        img = cv2.resize(img, (960, 640))
+
+        frame_count += 1
+        fps = frame_count / (time.time() - t_start)
+        cv2.putText(img, f"FPS: {fps:.1f}  frame: {dt*1000:.0f}ms", (10, 30),
+                    cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255, 255), 2)
+
+        cv2.imshow("Test liveview OpenCV", img)
+        if cv2.waitKey(1) & 0xFF == 27:  # ESC
+            break
+
+    except Exception as e:
+        print(f"Erreur: {e}")
+        break
+
+cam.exit()
+cv2.destroyAllWindows()
+print(f"Total: {frame_count} frames, {frame_count/(time.time()-t_start):.1f} FPS")