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- ''' Camera position estimation from center marker '''
- import cv2
- from cv2 import aruco
- import numpy as np
- import math
- import sys
- import os
- sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
- from default_config import *
- visualization = True
- # save
- output = 'distance_estimation/logs'
- if not os.path.exists(output):
- os.makedirs(output)
- log_file = os.path.join(output, f'log_{len(os.listdir(output)):03d}.txt')
- with open(log_file, 'w') as f:
- f.write('x,y,z,roll,pitch,yaw\n')
- # Tải dữ liệu hiệu chuẩn camera, phù hợp với độ phân giải ban đầu
- calib_data_path = f"camera_calibration/calib_data/{set_resolution}/MultiMatrix.npz"
- calib_data = np.load(calib_data_path)
- print('resolution:', set_resolution)
- cam_mat = calib_data["camMatrix"]
- dist_coef = calib_data["distCoef"]
- marker_dict = aruco.getPredefinedDictionary(aruco.DICT_7X7_50)
- param_markers = aruco.DetectorParameters()
- cap = cv2.VideoCapture(0)
- # Thay đổi độ phân giải phù hợp với yêu cầu ban đầu
- new_height = RESOLUTION_STANDARDS[set_resolution]
- new_width, new_height = change_resolution(cap,new_height)
- print(f'Resolution camera {new_width}x{new_height}')
- fps = cap.get(cv2.CAP_PROP_FPS)
- print(f"Frames per second: {fps}")
- # convert rotation matrix to euler angles (degrees)
- def rotationMatrixEulerAngles(rotMatrix):
- assert rotMatrix.shape == (3, 3), "Ma trận quay phải có kích thước 3x3"
- sy = math.sqrt(rotMatrix[0, 0]* rotMatrix[0, 0] + rotMatrix[1, 0]*rotMatrix[1, 0])
- singular = sy < 1e-6
- if not singular:
- x = math.atan2(rotMatrix[2, 1], rotMatrix[2, 2])
- x = np.round(np.degrees(x))
- y = math.atan2(-rotMatrix[2, 0], sy)
- y = np.round(np.degrees(y))
- z = math.atan2(rotMatrix[1, 0], rotMatrix[0, 0])
- z = np.round(np.degrees(z))
- else:
- x = math.atan2(rotMatrix[1, 0], rotMatrix[0, 0])
- x = np.round(np.degrees(x))
- y = math.atan2(-rotMatrix[2, 0], sy)
- y = np.round(np.degrees(y))
- z = 0
- return np.array([x, y, z])
- while True:
- ret, frame = cap.read()
- center_y, center_x = frame.shape[0]//2, frame.shape[1]//2
- cv2.drawMarker(frame, (center_x, center_y), (0,0,255), markerType=cv2.MARKER_CROSS, markerSize=10, thickness=1, line_type=cv2.LINE_AA)
- if not ret:
- break
- gray_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
- marker_corners, marker_IDs, reject = aruco.detectMarkers(
- gray_frame, marker_dict, parameters=param_markers
- )
- if marker_corners:
- rVec, tVec, _ = aruco.estimatePoseSingleMarkers(
- marker_corners, MARKER_SIZE, cam_mat, dist_coef
- )
- total_markers = range(0, marker_IDs.size)
- markers = {}
- for ids, corners, i in zip(marker_IDs, marker_corners, total_markers):
- corners = corners.reshape(4, 2)
- corners = corners.astype(int)
- top_right = corners[0].ravel()
- top_left = corners[1].ravel()
- bottom_right = corners[2].ravel()
- bottom_left = corners[3].ravel()
- # Chuyển đổi rVec thành ma trận quay R
- R, _ = cv2.Rodrigues(rVec[i])
- # Tính toán tọa độ các điểm của marker so với camera
- object_points = np.array([
- [-MARKER_SIZE / 2, MARKER_SIZE / 2, 0],
- [MARKER_SIZE / 2, MARKER_SIZE / 2, 0],
- [MARKER_SIZE / 2, -MARKER_SIZE / 2, 0],
- [-MARKER_SIZE / 2, -MARKER_SIZE / 2, 0]
- ])
- marker_points_camera = R @ object_points.T + tVec[i].reshape(3, 1)
- marker_points_camera = marker_points_camera.T
- distance = np.linalg.norm(tVec[i][0])
- # Draw the pose of the marker
- point = cv2.drawFrameAxes(frame, cam_mat, dist_coef, rVec[i], tVec[i], 4, 4)
- R, _ = cv2.Rodrigues(rVec[i]) # Chuyển rVec sang ma trận quay
- # R_inv = R.T # Lấy nghịch đảo của ma trận quay (tức là R^T nếu R là trực giao)
- # position = - R_inv @ tVec[i].reshape(3, 1) # Tính vị trí camera trong hệ marker
- # position = position.reshape(3,)
- position =np.array([-tVec[i][0][0], tVec[i][0][1], tVec[i][0][2]])
- position += default_positions[ids[0]]
- angles = rotationMatrixEulerAngles(R.T)
- markers[f'marker {ids[0]}'] = np.hstack((position, angles))
- if visualization:
- cv2.putText(
- frame,
- f"id: {ids[0]}",
- top_right,
- cv2.FONT_HERSHEY_PLAIN,
- 1.3,
- (0, 0, 255), 2, cv2.LINE_AA
- )
- # Nếu marker trung tâm (marker 0) xuất hiện thì chỉ cần lấy vị trí so với marker này
- if 'marker 0' in markers.keys():
- cam_position = markers['marker 0']
- # Nếu không, xét trung bình các marker
- else:
- cam_position = np.array([0., 0., 0., 0., 0., 0.])
- for v in markers.values():
- cam_position += v
- cam_position /= len(markers)
- with open(log_file, 'a') as f:
- line = ','.join(f'{i:.1f}' for i in cam_position.tolist()) +'\n'
- f.write(line)
- print(','.join(f'{i:.1f}' for i in cam_position.tolist()))
- if visualization:
- cv2.putText(
- frame,
- ','.join(f'{i:.1f}' for i in cam_position[:3].tolist()),
- (10, 20),
- cv2.FONT_HERSHEY_PLAIN,
- 1.,
- (0, 255, 0), 1, cv2.LINE_AA
- )
- cv2.putText(
- frame,
- ','.join(f'{i:.1f}' for i in cam_position[3:].tolist()),
- (10, 40),
- cv2.FONT_HERSHEY_PLAIN,
- 1.,
- (0, 0, 255), 1, cv2.LINE_AA
- )
- if visualization:
- cv2.imshow("frame", frame)
- key = cv2.waitKey(1)
- if key == ord("q"):
- break
- cap.release()
- if visualization:
- cv2.destroyAllWindows()
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