TPP-G6
75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
import cv2
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import time
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# Toggle these to test whether exposure is limiting delivered FPS.
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USE_MANUAL_EXPOSURE = False
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MANUAL_EXPOSURE = -6 # Typical V4L2/OpenCV manual range is negative values.
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cap = cv2.VideoCapture(4, cv2.CAP_V4L2)
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cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter.fourcc('M', 'J', 'P', 'G'))
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cap.set(cv2.CAP_PROP_FPS, 30)
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cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
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cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
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cap.set(cv2.CAP_PROP_BUFFERSIZE, 1)
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# For V4L2 in OpenCV: auto-exposure is usually 3, manual is usually 1.
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if USE_MANUAL_EXPOSURE:
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ok_auto = cap.set(cv2.CAP_PROP_AUTO_EXPOSURE, 1)
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ok_exp = cap.set(cv2.CAP_PROP_EXPOSURE, MANUAL_EXPOSURE)
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else:
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ok_auto = cap.set(cv2.CAP_PROP_AUTO_EXPOSURE, 3)
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ok_exp = True
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actual_fourcc = int(cap.get(cv2.CAP_PROP_FOURCC))
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print(f"Backend: {cap.getBackendName()}")
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print(
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f"FOURCC: {chr(actual_fourcc & 0xFF)}"
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f"{chr((actual_fourcc >> 8) & 0xFF)}"
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f"{chr((actual_fourcc >> 16) & 0xFF)}"
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f"{chr((actual_fourcc >> 24) & 0xFF)}"
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)
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print(f"Resolution: {int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))}x{int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))}")
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print(f"FPS: {cap.get(cv2.CAP_PROP_FPS)}")
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print(
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f"Exposure mode: {'manual' if USE_MANUAL_EXPOSURE else 'auto'} "
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f"(set_auto_ok={ok_auto}, set_exp_ok={ok_exp})"
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)
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print(f"AutoExposure(readback): {cap.get(cv2.CAP_PROP_AUTO_EXPOSURE)}")
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print(f"Exposure(readback): {cap.get(cv2.CAP_PROP_EXPOSURE)}")
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frame_count = 0
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start = time.perf_counter()
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while cap.isOpened():
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t0 = time.perf_counter()
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ok = cap.grab()
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t1 = time.perf_counter()
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if not ok:
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break
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ret, frame = cap.retrieve()
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t2 = time.perf_counter()
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if not ret:
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continue
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cv2.imshow("webcam", frame)
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t3 = time.perf_counter()
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key = cv2.waitKey(1) & 0xFF
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t4 = time.perf_counter()
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frame_count += 1
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if frame_count % 30 == 0:
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elapsed = t4 - start
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print(
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f"Frame {frame_count}: "
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f"grab={1000*(t1-t0):.1f}ms, "
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f"retrieve={1000*(t2-t1):.1f}ms, "
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f"imshow={1000*(t3-t2):.1f}ms, "
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f"waitKey={1000*(t4-t3):.1f}ms, "
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f"avg_fps={frame_count/elapsed:.1f}"
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)
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if key == ord('q'):
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break
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cap.release()
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cv2.destroyAllWindows() |