• Challenges and solutions of perception system in L4 automatic driving


    Reading Guide:Outline of this sharing—— Perception Introduction Sensor Setup & Sensor Fusion Perception Onboard System Perception Technical Challenges — 01 Perception Introduction Perception system takes the data of various sensors and the information of high-precision map as the input. After a series of calculation and processing, it can accurately perceive the surrounding environment of the […]

  • Principle of optical motion capture system


    Nokov measurement optical motion capture system is a motion capture system based on the principle of infrared optics. Compared with the positioning means such as inertial principle motion capture system and GPS positioning system, it has the characteristics of high precision, low delay, strong real-time performance and is mostly used in indoor scenes. The system […]

  • Practice of qcon ocpx multi-objective and multi scene joint modeling in oppo


    1 background Since Facebook launched ocpx in 2012, the development of ocpx products and capabilities in the industry has been very mature. The commercial algorithm of oppo digital intelligence engineering system algorithm platform Department has also accumulated some practical experience in ocpx capacity construction. 2. What is ocpx From the definition of a delivery platform, […]

  • Epson robot basic learning notes


    Basic concepts Axis: a movable joint that can generally do reciprocating motion or rotation. Pulse: the movement of the shaft requires a certain pulse. If there are many pulses, the movement time will be long. Origin: 0 pulse. Attitude of each axis. Point position: generally saved as (x, y, Z, U). It records the position […]

  • Frequency regulation of IRC internal oscillation source of stc8a, stc8g and stc8h series


    From stc10 / stc11 series, built-in RC oscillation source (built-in clock, macro crystal called IRC) appears Since the stc10 / stc10 clock source is not recommended to be used in the internal communication manual when there is a large error in the stc10 / stc10 clock source After the stc15 generation, the accuracy has improved […]

  • Classification of machine learning: prediction bias


    The logistic regression prediction should be unbiased. That is, the “predicted average” should be approximately equal to the “observed average”Prediction deviationIt refers to the difference between the two averages. Namely:Forecast deviation = forecast average – the average of the corresponding labels in the datasetNote: “forecast deviation” is not the same as “Deviation” (“B” in “Wx […]

  • Simple music recognition with STM32 F103 and LM386 sound sensor


      Simple music recognition with STM32 F103 and LM386 sound sensor 1. Preface     In early December 2019, there will be a biped robot competition in the Chinese robot skills competition, which means robotRecognize the music and dance with corresponding rhythmThree songs randomly selected from five music, music stop, robot stop.     New competition, new project, difficulty […]

  • In depth evaluation: Android’s free bank card identification SDK, Huawei HMS mlkit or card IO?


    1 Introduction Two previous articles have introduced the bank card identification function of Huawei HMS mlkit. The first one is about how to integrate the bank card identification and realize the bank card binding function. The second article introduces the difference and relationship between the bank card identification and other text type identification services. For […]

  • Debugging method of NTP time calibration server


    NTP time calibration server design at the beginning of the use of the concept of fool operation, in the procurement time do not need to worry too much about debugging, this paper will focus on how to receive the time calibration server debugging, for user reference. 1、Put the mushroom head antennaThe BNC interface is inserted […]

  • Ubuntu Install kitti2bag


    The project needs to test the mapping effect, but at present, the effect of our own semantic segmentation training is not very good, and the accuracy of external parameter matrix calibration is not high, so we plan to use Kitti data set as test. Therefore, we need to convert the Kitti data set into bag […]

  • Detailed explanation of priority bitmap algorithm


    stayReview of embedded operating systemIn the task scheduling section, we mentioned the basic knowledge of μ C / OS-IIPriority bitmap algorithmThis paper introduces the principle and implementation of the algorithm in detail.Link to original text 1、Brief introduction of μ C / OS-II task priorityThere are 64 priorities in μ C / OS-II (0 ~ 63 […]

  • Chapter 2 bjrobot IMU automatic calibration


    1、Lay the car flat on the floor and open a terminal with the virtual machine in the data ssh In the past, the main control terminal startedroslaunch znjrobot bringup.launch 。 2、Open another terminal,ssh Past main control terminal,stay ~/catkin_ws/src/znjrobot_project/znjrobot/param/imu Under the pathstart-up imu Correction command.rosrun imu_calib do_calib 3、Press enter to complete the calibration. Remember: runimuAutomatic correction, must jump to~/catkin_ ws/src/znjrobot_ Run […]