{"id":45292,"date":"2019-02-04T14:44:12","date_gmt":"2019-02-04T21:44:12","guid":{"rendered":"https:\/\/www.realsenseai.com\/uncategorized-cn\/how-to-getting-imu-data-from-d435i-and-t265\/"},"modified":"2026-03-19T15:59:58","modified_gmt":"2026-03-19T21:59:58","slug":"how-to-getting-imu-data-from-d435i-and-t265","status":"publish","type":"post","link":"https:\/\/www.realsenseai.com\/cn\/news-insights-cn\/how-to-getting-imu-data-from-d435i-and-t265\/","title":{"rendered":"How-to: Getting IMU data from D435i and T265"},"content":{"rendered":"\nWith the introduction of the <a href=\"\/?page_id=1618\">RealSense\u2122 Depth Camera D435i<\/a> and <a href=\"https:\/\/realsenseai.com\/?page_id=9508\">Tracking Camera T265<\/a>, the librealsense SDK has been enhanced to support and effectively utilize the functionality provided by these new sensors.\n<h3>Core Capabilities<\/h3>\nThe D435i and T265 models sport a Bosch BMI055 6-axis inertial sensor. Inertial Measurement Units (IMU) are sensors which allow measurement of both directional movement and rotation. The sensor is comprised of triaxial 12bit linear acceleration and triaxial 16bit angular velocity gyro sensors.\n\nThe D435i depth camera generates and transmits the gyro and accelerometer samples independently, as the inertial sensors exhibit different FPS rates (200\/400Hz for gyro, 63\/250Hz for accelerometer). Each IMU data packet is timestamped using the depth sensor hardware clock to allow temporal synchronization between gyro, accel and depth frames.\n\nThe T265 tracking camera utilizes the same IMU sensor as the D435i. However, unlike the D435i, which delivers the raw IMU data directly to the host PC, the T265 redirects IMU readings into an Movidius\u2122 Myriad\u2122 2 Vision Processing Unit (VPU). The inertial sensor data is also complemented by video from two fisheye monochrome sensors that are fed into the VPU as well.\n\nThe VPU employed with T265 is capable of fusing inertial and video sensors to produce a reliable and persistent six degrees of freedom (6DOF) pose, offloading the CPU-intensive calculations from the host PC.\n\nThe following table summarizes the features and capabilities of the two devices (T265 vs D435i):\n<div class=\"table-responsive\">\n<table class=\"table table-striped\">\n<tbody>\n<tr>\n<td><strong>Feature<\/strong><\/td>\n<td><strong>D435i<\/strong><\/td>\n<td><strong>T265<\/strong><\/td>\n<td><strong>Notes<\/strong><\/td>\n<\/tr>\n<tr>\n<td>IMU Sensor<\/td>\n<td>Bosch BMI055<\/td>\n<td>Bosch BMI055<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>IMU Bias&amp;Scale Correction<\/td>\n<td>Not provided<sup>1<\/sup><\/td>\n<td>Yes<\/td>\n<td><sup>1<\/sup>Feasible with SDK suite (<a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/blob\/master\/doc\/d435i.md\" target=\"_blank\" rel=\"noopener noreferrer\">D435i<\/a>, <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/blob\/master\/doc\/t265.md\" target=\"_blank\" rel=\"noopener noreferrer\">T265<\/a>)<\/td>\n<\/tr>\n<tr>\n<td>3DOF acceleration<\/td>\n<td>62.5\/250 Hz<\/td>\n<td>62.5Hz<\/td>\n<td>meter\/sec<sup>2<\/sup><\/td>\n<\/tr>\n<tr>\n<td>3DOF gyro<\/td>\n<td>200\/400 Hz<\/td>\n<td>200Hz<\/td>\n<td>radian\/sec<\/td>\n<\/tr>\n<tr>\n<td>6DOF Pose<\/td>\n<td>N\/A<\/td>\n<td>HW-generated at 262 Hz<\/td>\n<td>Each sample contains:\n&#8211; Position vector [xyz]\n&#8211; Orientation quaternion [xyzw]\n&#8211; Linear velocity and acceleration vectors\n&#8211; Angular velocity and acceleration vectors\n&#8211; Tracking confidence [hi\/med\/low]<\/td>\n<\/tr>\n<tr>\n<td>Additional sensors<\/td>\n<td>Depth\/Left+Right IR\/RGB identical to D435<\/td>\n<td>Two Fisheye sensors at 848X800 resolution\/ 30FPS<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Relocalization<\/td>\n<td>N\/A<\/td>\n<td>Yes<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Sensors orientation<\/td>\n<td>Aligned to depth<\/td>\n<td>VR-Standard<\/td>\n<td>See <a href=\"#Tracking_Sensor_Origin_and_CS\">Tracking Sensor Origin and CS<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<a name=\"Tracking_Sensor_Origin_and_CS\"><\/a>\n<h3>Tracking Sensor Origin and Coordinate System (CS)<\/h3>\n<h4>RealSense D435i<\/h4>\nThe IMU sensor location and orientation relative to the depth sensors are conveniently embedded into the sensor\u2019s extrinsic data. In order to align and them with SDK-wide established <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/wiki\/Projection-in-RealSense-SDK-2.0#point-coordinates\" target=\"_blank\" rel=\"noopener noreferrer\">orientation convention<\/a> using the depth sensor as CS origin, each IMU sample is multiplied internally by the extrinsic matrix.\n\nThe resulted orientation angles and acceleration vectors share the coordinate system with the depth sensor.\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2761\" src=\"https:\/\/realsenseai.com\/wp-content\/uploads\/2019\/02\/LRS_CS_axis_base.png\" alt=\"\" width=\"282\" height=\"201\" \/>\n\n1. The positive x-axis points to the right.\n2. The positive y-axis points down.\n3. The positive z-axis points forward\n\nThe angles are also compatible with <a href=\"https:\/\/docs.opencv.org\/3.4.0\/d9\/d0c\/group__calib3d.html\" target=\"_blank\" rel=\"noopener noreferrer\">OpenCV convention for pinhole camera model<\/a>.\n<h4>RealSense T265<\/h4>\nTo aid AR\/VR integration, the TM265 tracking device uses the defacto VR framework standard coordinate system instead of the SDK standard:\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2765\" src=\"https:\/\/realsenseai.com\/wp-content\/uploads\/2019\/02\/T265_orientation_axis.png\" alt=\"\" width=\"358\" height=\"253\" srcset=\"https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/T265_orientation_axis.png 358w, https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/T265_orientation_axis-300x212.png 300w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/>\n\n1. Positive X direction is towards right imager\n2. Positive Y direction is upwards toward the top of the device\n3. Positive Z direction is inwards toward the back of the device\n\nThe center of tracking corresponds to the center location between the right and left monochrome imagers on the device.\n<h3>Device calibration<\/h3>\nThe IMU sensor does not include internal calibration, which may manifest itself with non-zero angular velocities produced at idle mode and the gravity (accel) force measured being not equal to 9.80665 m\/s2. In order to rectify those inaccuracies, the T265\u2019s IMU sensor is calibrated in the production line.\n\nFor D435i the IMU sensor is not calibrated, hence a <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/tree\/development\/tools\/rs-imu-calibration#rs-imu-calibration-tool\" target=\"_blank\" rel=\"noopener noreferrer\">free calibration tool<\/a> is available as as part of the SDK. Running the calibration routine will calculate IMU intrinsic covariance and zero offsets, and then store them on device\u2019s NVRAM for later use in SDK. The depth&lt;-&gt;IMU sensor extrinsic (rigid body transformation) is precalculated based on mechanical drawings and cannot be modified. When initialized, the SDK will query the device for the existence of the IMU calibration data, and if present &#8211; apply it to the raw IMU samples produced by the device.\n<h3>Integration with the SDK<\/h3>\nThe following librealsense tools and demos are IMU and tracking-ready:\n\n&#8211; <em>rs-capture<\/em> &#8211; 2D Visualization.\n\n&#8211; <em>rs-enumerate-devices<\/em> &#8211; list the IMU and tracking profiles (FPS rates and formats).\n\n&#8211; <em>rs-data-collect<\/em> &#8211; Store and serialize IMU and Tracking (pose) data in Excel-friendly csv format. The tool uses low-level sensor API to minimize software-imposed latencies. Useful for performance profiling.\n\n&#8211; <em>realsense-viewer<\/em> &#8211; Provides 2D visualization of IMU and Tracking data. 3D visualization is available for Pose samples:\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2769\" src=\"https:\/\/realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_snapshot.png\" alt=\"\" width=\"1473\" height=\"903\" srcset=\"https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_snapshot.png 1473w, https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_snapshot-300x184.png 300w, https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_snapshot-1024x628.png 1024w, https:\/\/www.realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_snapshot-768x471.png 768w\" sizes=\"auto, (max-width: 1473px) 100vw, 1473px\" \/>\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2773\" src=\"https:\/\/realsenseai.com\/wp-content\/uploads\/2019\/02\/t265_trajectory_tracker.gif\" alt=\"\" width=\"953\" height=\"589\" \/>\n\nThe IMU and Tracking data streams are fully compatible with SDK\u2019s embedded recorder utility.\n<h3>API<\/h3>\nThe IMU and tracking sensors are treated by the SDK like any other supported sensor. Therefore the sensor access and invocation API calls are similar to those of the depth\/rgb sensors of D400 and SR300. See <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/blob\/master\/doc\/t265.md\" target=\"_blank\" rel=\"noopener noreferrer\">our GitHub<\/a> for more details.\n<h3>Supported platforms<\/h3>\nThe IMU and tracking sensors are currently supported on Windows and Linux* OS. Linux OS requires the kernel patches to applied either <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/blob\/master\/doc\/installation.md#linux-ubuntu-installation\" target=\"_blank\" rel=\"noopener noreferrer\">manually<\/a> or via the <a href=\"https:\/\/github.com\/IntelRealSense\/librealsense\/blob\/master\/doc\/distribution_linux.md#installing-the-packages\" target=\"_blank\" rel=\"noopener noreferrer\">librealsense2-dkms package<\/a>.\nmacOS* and Android* support is planned but there is still no firm timeline.\n","protected":false},"excerpt":{"rendered":"<p>With the introduction of the RealSense\u2122 Depth Camera D435i and Tracking Camera T265, the librealsense SDK has been enhanced to support and effectively utilize the functionality provided by these new sensors.<\/p>\n","protected":false},"author":1,"featured_media":42962,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"featured_image_focal_point":[],"inline_featured_image":false,"footnotes":""},"categories":[1209,1211,1193],"tags":[637,558,616],"capability_application":[],"industry":[],"class_list":["post-45292","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sdk-2-articles-cn","category-stereo-depth-cn","category-news-insights-cn","tag-imu-2","tag-sdk","tag-tracking-3"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How-to: Getting IMU data from D435i and T265 - RealSense<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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