qq_40073719的博客

原创 keyring issue in ubuntu

Your password no longer matches your keyring" and then prompts for your a password to “unlock your keyring”Delete the file in ~/.local/share/keyrings/, and next time you will be asked for a new password.

原创 如何在Ubuntu下解决OpenGL问题？

【代码】如何在Ubuntu下解决OpenGL问题？

原创 RLException: Invalid ＜param＞ tag: Cannot load command parameter [rosversion]: command......

在.local文件夹下，解除bin/和lib/的锁，即可。

原创 Error: Flash Download failed - Cortex-M4

Error: Flash Download failed - Cortex-M4

原创 Please run the following command first: git submodule update --init

Please run the following command first: git submodule update --init

原创 ros使用构造函数初始化无法订阅节点问题

//主函数int main(int argc, char** argv){ ros::init(argc, argv, "line_patrol"); linework obj;//类的实例化 ros::spin(); return 0;}注意是否为类进行实例化

转载 ros中使用opencv处理图像

cv_bridge::toCvCopy()：ROS下的sensor_msgs/ImageConstPtr，和图像压缩类型（例如：sensor_msgs::image_encodings::RGB8），Subscriber 来的图像不能直接使用，需要copy出来。其功能是实现复制图像信息这样，得到副本，这样我们可以从副本的CvImage中提取cv::Mat类型的图像进行处理。例如void convert_callback(const sensor_msgs::ImageConstPtr& msg)

原创 darknet_ros编译与opencv配置遇到的一些问题

在cv_bridge的CMakelists.txt中将第一个set里后的4改为如图的3，下面括号一样（因本人曾经使用opencv4.5）修改完后catkin_make会报如下错误根据错误提示的路径找到/usr/local/include/opencv2/core/cvdef.h这个文件。在/usr/local/include/opencv2/core/这个文件夹下打开终端，执行下面代码。sudo geditcvdef.h接下来还会有一个错误在/usr/local/include/openc

原创 jetson系列命令行更改界面分辨率

xrandr — df 1280x720（双-）

原创 QT----cuda_runtime.h: No such file or directory

AddINCLUDEPATH += /usr/local/cuda-10.2(your cuda version)/targets/aarch64-linux/include \ in .pro

原创 add_custom_target cannot create target “msg_generate_messages_py“ because another target with the

package.xml 依赖没有和cmakelist.txt中设置一致<exec_depend>msg</exec_depend><build_depend>msg</build_depend>find_package(catkin REQUIRED COMPONENTSgeometry_msgsmsgroscpprospystd_msgs)msg is customize

原创 2020-10-29

catkin_package(# INCLUDE_DIRS include# LIBRARIES joystick CATKIN_DEPENDS geometry_msgs ***message_runtime*** roscpp rospy std_msgs# DEPENDS system_lib) <exec_depend>***message_runtime***</exec_depend>

原创 ROS catkin_make无法通过

自定义消息类型，在src文件夹中的cpp文件中引用pkg.h头，但无法识别。原因是在devel中的include没有生成相应的头文件。我是直接把cpp移除，在进行编译，通过后发现devel中的include文件夹中生成pkg.h文件，此时再将.cpp文件加入，重新编译，此时顺利通过。...

原创 Wrong type of output lines: ＞ ‘type == CV_32FC2 || type == CV_32FC3‘

terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(4.1.1) /home/nvidia/host/build_opencv/nv_opencv/modules/imgproc/src/hough.cpp:904: error: (-2:Unspecified error) in function 'void cv::HoughLines(cv::InputArray, cv::OutputArr

原创 水下图片

原创 hackson

https://developer.nvidia-china.com/forum.php?mod=forumdisplay&fid=179

原创 欢迎NVIDIA-SMI has failed because it couldnt communicate with the NVIDIA driver. Make sure that the...

先确定secure boot已经关闭

原创 arduino_rov_just_depth_pid

PID_D(int rov_depth,float kp_D,float ki_D,float kd_D){ static float sum1,new_e; new_e=rov_depth_target-rov_depth,D_flag=0; if(new_e<0) { D_flag=1; new_e=-new_e; } float r; sum1+=new_e; rov_deep_pid=kp_D*new_e+ki_D*sum1+kd_D*pid

原创 ros串口发送数据格式（小坑）

3种格式size_t write (const uint8_t *data, size_t size)size_t write (const std::vector< uint8_t > &data)size_t write (const std::string &data)本人使用第三种进行发送，需将int数据转成string发送，使用to_string（）报错，因为没有加入c++11，需在CMakeLists.txt 中取消注释add_compile_op

原创 ros中catkin_make出现undefined reference to `serial::Serial...........

原因可能是Cmakelists.txt中find_package没有添加serialfind_package(catkin REQUIRED COMPONENTS roscpp std_msgs geometry_msgs serial )

原创 ROS通过rosserial_arduino与arduino进行通讯时，无法读取i2c数据。

#include "I2Cdev.h"#include "MPU6050_6Axis_MotionApps20.h"#if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE#include "Wire.h"#endif#include <ArduinoHardware.h>#include <geometry_msgs/Twist.h>#include <ros/time.h>#include <tf/tran

原创 arduino-dmp-mpu6050

#include "I2Cdev.h"#include "MPU6050_6Axis_MotionApps20.h"#if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE#include "Wire.h"#endifMPU6050 mpu;#define OUTPUT_READABLE_YAWPITCHROLL#define LED_PIN 13 // (Arduino is 13, Teensy is 11, Teensy++ is 6)bool

原创 itg3200-笔记

#include <Wire.h> // I2C library, gyroscope// Accelerometer ADXL345#define ACC (0x53) //ADXL345 ACC address#define A_TO_READ (6) //num of bytes we are going to read each time (two bytes for each axis)// Gyroscope ITG3200#define GYRO

转载 arduino-kalman

#include <Wire.h> // I2C library, gyroscope// Accelerometer ADXL345#define ACC (0x53) //ADXL345 ACC address#define A_TO_READ (6) //num of bytes we are going to read each time (two bytes for each axis)// Gyroscope ITG3200#define GYRO

原创 与jetson nano建立ssh

（1）、虚拟机网络设置为nat（无需桥接），将主机与nano连接在同一路由器上即可。（2）、仔细检查各项名称是否写对。

原创 “Train dataset for temp stage can not be filled. Branch training terminated ...“

负样本neg.txt文件中使用精确地址（千万注意）！！！！！

原创 opencv生成vec样本文件时找不到opencv_createsamples.exe的解决方案

opencv_createsamples.exe -vec pos.vec -info pos.txt -num 18500 -w 20 -h 20（原操作）找不到opencv_createsamples.exe文件，只有opencv_createsamples，其是共享库 (application/x-sharedlib)类型用./opencv_createsamples测试下其内容是否正确（以下为输出）Usage: ./opencv_createsamples [-info <collecti

原创 QT中使用opencv c++批量处理图像（缩放、转灰度）

main.cpp#include <iostream>#include <opencv2/opencv.hpp>#include<stdio.h>using namespace std;using namespace cv;int main(){ cv::Mat outImage,dstImg,andstImg; cv::String src_path = "/home/jacky/people re/new/*.JPG"; ..

原创 QT（ROS）程序无错但无GUI出现原因分析

（1）、检查"项目"->"运行"是否对应正确路径。（2）、检查Cmakelist文件底add_executabletarget_link_librariesinstall文件内是否添加对应package。