{ "value0": { "T_imu_cam": [ { "px": -0.08394275605678558, "py": -0.0025952591095119715, "pz": 0.0026445253752171993, "qx": -0.17704728245735168, "qy": -0.19861078262329102, "qz": 0.035641565918922424, "qw": 0.9632952809333801 }, { "px": 0.021131351590156555, "py": -0.002306802896782756, "pz": 0.0023415968753397465, "qx": -0.18363775312900543, "qy": 0.19827023148536682, "qz": -0.03922446444630623, "qw": 0.961991548538208 } ], "intrinsics": [ { "camera_type": "kb4", "intrinsics": { "fx": 268.195975920864, "fy": 268.0574654154223, "cx": 323.31709283956959, "cy": 245.75222869648526, "k1": 0.0786766526301811, "k2": -0.030847669265979546, "k3": 0.20850845540314143, "k4": -0.1196923005962833 } }, { "camera_type": "kb4", "intrinsics": { "fx": 269.40740366226648, "fy": 269.8023515180134, "cx": 322.776132065183, "cy": 251.10164045580167, "k1": 0.06239234153858448, "k2": -0.010654168469050596, "k3": 0.19636276150943167, "k4": -0.11784770077286101 } } ], "resolution": [ [ 640, 480 ], [ 640, 480 ] ], "// about calib_accel/gyro_bias": "Bias values (first three elements) are negated, in basalt they get substracted, but in azure-kinect they are added", "// - ": "Also the mixing matrix has I3x3 substracted, i.e. diagonal are one unit smaller", "// about calib_accel_bias": "See https://gitlab.com/VladyslavUsenko/basalt-headers/-/issues/8 to understand why accel only uses 6 elements of the mixing matrix", "calib_accel_bias": [ 0.18563582003116608, -0.057621683925390244, 0.13435612618923187, -0.001865983009338379, 0.00030630044057033956, -0.0001675997773418203, 0.0009244680404663, 0.000295753387035802, -0.0022075772285461426 ], "calib_gyro_bias": [ -0.016492774710059166, 0.01642640121281147, 0.0045625129714608192, 0.0000957250595093, -0.00082384591223672032, -0.0015064212493598461, -0.00082343036774545908, -0.00041097402572631836, -4.7357993935293052e-6, -0.0015050634974613786, -4.7339185584860388e-6, -0.0008063316345214844 ], "imu_update_rate": 250.0, "accel_noise_std": [ 0.010700000450015068, 0.010700000450015068, 0.010700000450015068 ], "gyro_noise_std": [ 0.00095000001601874828, 0.00095000001601874828, 0.00095000001601874828 ], "accel_bias_std": [ 0.0999999988824129, 0.0999999988824129, 0.0999999988824129 ], "gyro_bias_std": [ 0.009999999873689375, 0.009999999873689375, 0.009999999873689375 ], "cam_time_offset_ns": 0, "vignette": [] } }