Calibration Reader

1import depthai as dai
2
3with dai.Device() as device:
4  calibData = device.readCalibration()
5  intrinsics = calibData.getCameraIntrinsics(dai.CameraBoardSocket.RIGHT)
6  print('Right mono camera focal length in pixels:', intrinsics[0][0])

1f_x = text{width}_x cdot frac{1}{2 cdot tan left(frac{text{HFOV}_x}{2}frac{pi}{180}right)}

1f_x = 640 cdot frac{1}{2 cdot tan left(frac{71.9}{2}frac{pi}{180}right)} = 441.25

1f_x = 1280 cdot frac{1}{2 cdot tan left(frac{71.9}{2}frac{pi}{180}right)} = 882.5

1git clone https://github.com/luxonis/depthai-python.git
2cd depthai-python/examples
3python3 install_requirements.py

1#!/usr/bin/env python3
2
3import depthai as dai
4import numpy as np
5import sys
6from pathlib import Path
7
8# Connect Device
9with dai.Device() as device:
10    calibFile = str((Path(__file__).parent / Path(f"calib_{device.getMxId()}.json")).resolve().absolute())
11    if len(sys.argv) > 1:
12        calibFile = sys.argv[1]
13
14    calibData = device.readCalibration()
15    calibData.eepromToJsonFile(calibFile)
16
17    M_rgb, width, height = calibData.getDefaultIntrinsics(dai.CameraBoardSocket.CAM_A)
18    print("RGB Camera Default intrinsics...")
19    print(M_rgb)
20    print(width)
21    print(height)
22
23    if "OAK-1" in calibData.getEepromData().boardName or "BW1093OAK" in calibData.getEepromData().boardName:
24        M_rgb = np.array(calibData.getCameraIntrinsics(dai.CameraBoardSocket.CAM_A, 1280, 720))
25        print("RGB Camera resized intrinsics...")
26        print(M_rgb)
27
28        D_rgb = np.array(calibData.getDistortionCoefficients(dai.CameraBoardSocket.CAM_A))
29        print("RGB Distortion Coefficients...")
30        [print(name + ": " + value) for (name, value) in
31         zip(["k1", "k2", "p1", "p2", "k3", "k4", "k5", "k6", "s1", "s2", "s3", "s4", "τx", "τy"],
32             [str(data) for data in D_rgb])]
33
34        print(f'RGB FOV {calibData.getFov(dai.CameraBoardSocket.CAM_A)}')
35
36    else:
37        M_rgb, width, height = calibData.getDefaultIntrinsics(dai.CameraBoardSocket.CAM_A)
38        print("RGB Camera Default intrinsics...")
39        print(M_rgb)
40        print(width)
41        print(height)
42
43        M_rgb = np.array(calibData.getCameraIntrinsics(dai.CameraBoardSocket.CAM_A, 3840, 2160))
44        print("RGB Camera resized intrinsics... 3840 x 2160 ")
45        print(M_rgb)
46
47
48        M_rgb = np.array(calibData.getCameraIntrinsics(dai.CameraBoardSocket.CAM_A, 4056, 3040 ))
49        print("RGB Camera resized intrinsics... 4056 x 3040 ")
50        print(M_rgb)
51
52
53        M_left, width, height = calibData.getDefaultIntrinsics(dai.CameraBoardSocket.CAM_B)
54        print("LEFT Camera Default intrinsics...")
55        print(M_left)
56        print(width)
57        print(height)
58
59        M_left = np.array(calibData.getCameraIntrinsics(dai.CameraBoardSocket.CAM_B, 1280, 720))
60        print("LEFT Camera resized intrinsics...  1280 x 720")
61        print(M_left)
62
63
64        M_right = np.array(calibData.getCameraIntrinsics(dai.CameraBoardSocket.CAM_C, 1280, 720))
65        print("RIGHT Camera resized intrinsics... 1280 x 720")
66        print(M_right)
67
68        D_left = np.array(calibData.getDistortionCoefficients(dai.CameraBoardSocket.CAM_B))
69        print("LEFT Distortion Coefficients...")
70        [print(name+": "+value) for (name, value) in zip(["k1","k2","p1","p2","k3","k4","k5","k6","s1","s2","s3","s4","τx","τy"],[str(data) for data in D_left])]
71
72        D_right = np.array(calibData.getDistortionCoefficients(dai.CameraBoardSocket.CAM_C))
73        print("RIGHT Distortion Coefficients...")
74        [print(name+": "+value) for (name, value) in zip(["k1","k2","p1","p2","k3","k4","k5","k6","s1","s2","s3","s4","τx","τy"],[str(data) for data in D_right])]
75
76        print(f"RGB FOV {calibData.getFov(dai.CameraBoardSocket.CAM_A)}, Mono FOV {calibData.getFov(dai.CameraBoardSocket.CAM_B)}")
77
78        R1 = np.array(calibData.getStereoLeftRectificationRotation())
79        R2 = np.array(calibData.getStereoRightRectificationRotation())
80        M_right = np.array(calibData.getCameraIntrinsics(calibData.getStereoRightCameraId(), 1280, 720))
81
82        H_left = np.matmul(np.matmul(M_right, R1), np.linalg.inv(M_left))
83        print("LEFT Camera stereo rectification matrix...")
84        print(H_left)
85
86        H_right = np.matmul(np.matmul(M_right, R1), np.linalg.inv(M_right))
87        print("RIGHT Camera stereo rectification matrix...")
88        print(H_right)
89
90        lr_extrinsics = np.array(calibData.getCameraExtrinsics(dai.CameraBoardSocket.CAM_B, dai.CameraBoardSocket.CAM_C))
91        print("Transformation matrix of where left Camera is W.R.T right Camera's optical center")
92        print(lr_extrinsics)
93
94        l_rgb_extrinsics = np.array(calibData.getCameraExtrinsics(dai.CameraBoardSocket.CAM_B, dai.CameraBoardSocket.CAM_A))
95        print("Transformation matrix of where left Camera is W.R.T RGB Camera's optical center")
96        print(l_rgb_extrinsics)