lpcarl-CSDN博客

原创 H264原理与源码阅读、实践心得

DCT与近似DCT变换原理DCT的目的在于将高频、低频图片信息分离，这样就能舍弃高频分量，达到压缩的目的。DCT的重点在于矩阵的运算，运算的过程如下但是这种方式涉及三角函数计算，因此为了计算方便，通过近似DCT变化来简化运算。 Python实现#import numpy as np###待压缩图像块X=np.array(([5,11,8...

2018-07-23 16:20:47 242

原创 708教室使用方法

708教室的布局如下，重要的设备已经在图中标出。总开关、一体机和机柜。

2023-06-06 14:25:54 397

原创 608教室使用方法

608教室的布局如下，重要的设备已经在图中标出。总开关、一体机和机柜。

2023-06-06 14:24:30 1074

原创 508教室使用方法

508教室的布局如下，重要的设备已经在图中标出。总开关、一体机和机柜。

2023-06-06 11:42:41 578

原创 408教室使用

只要是理工学院的教职员工都可以直接刷脸进入408教室。

2023-06-06 11:38:55 64

静态NAT转换采用如图所示的结构，每个端口配置如下的ip首先得理解这个结构，r4的s2/0端口和r6和pc8共同组成外网r4的f0/0和交换机s2以及pc6 pc7组成内网，因此配完ip后，还得保证r4能ping通pc8同样pc8也能ping通r4的s2/0因此需要添加静态路由在r4上configure terminal ip route 192.168.3.0 255.255.255.0 192.168.2.2该条命令保证r4能ping通pc8r4和pc8由于是直接连接在路由器

2021-11-25 21:27:09 9119

原创思科路由器dhcp服务器配置

路由器DHCP服务器dhcp服务器采用如下的结构首先enable configure terminal#设置dhcp地址池service dhcpip dhcp pool xinlannetwork 192.168.11.0 255.255.255.0dns-server 192.168.11.1default-router 192.168.11.1exit## 设置连接的端口ip address 192.168.11.1 255.255.255.0no shutdown

2021-11-24 20:41:18 9570

原创 Ubuntu14.04设置samba共享文件夹

samba共享文件夹Samba是在Linux和UNIX系统上实现SMB协议的一个免费软件，由服务器及客户端程序构成。SMB（Server Messages Block，信息服务块）是一种在局域网上共享文件和打印机的一种通信协议，它为局域网内的不同计算机之间提供文件及打印机等资源的共享服务。SMB协议是客户机/服务器型协议，客户机通过该协议可以访问服务器上的共享文件系统、打印机及其他资源。通过设置“NetBIOS over TCP/IP”使得Samba不但能与局域网络主机分享资源，还能与全世界的电脑分享资源

2021-11-15 07:45:00 1568 2

原创 Ubuntu 14.04安装FTP服务器

安装采用如下命令安装ftp服务器sudo apt install vsftpd软件管理软件管理方式service vsftpd start 启动service vsftpd restart 重启service vsftpd stop 停止service vsftpd status 查看状态匿名访问方式修改配置文件gedit /etc/vsftpd.conf并写入配置anonymous_enable=YESanon_root= /data/publocal_

2021-11-08 09:40:50 1186

原创 MQTT使用与C接口测试

MQTT从入门到编程MQTT服务器安装与配置1、安装使用apt包管理工具安装sudo apt install mosquitto 2、修改配置切换到/etc/mosquitto/目录下修改配置cd /etc/mosquitto/sudo gedit mosquitto.conf添加两个配置allow_anonymous falsepassword_file /etc/mosquitto/pwfile.txt紧接着，按照上面的配置添加/etc/mosquitto/pwfile.

2021-10-31 20:09:52 4694

原创 Ubuntu 14.04下编译OpenCV4

一、准备下载opencv源码1、git clone https://github.com/opencv/opencv.git2、可以通过下载zip包的方式、安装cmake g++等编译工具切换到root用户下，并安装编译工具链apt install cmake3 cmake3-qt-gui g++解压源码unzip opencv-master.zip二、配置并编译首先，在opencv目录下配置两个文件夹，build和installbuild用来保存中间编译生成的临时文件in

2021-10-25 08:56:08 2091

原创【ffmpeg-libav-tutorial】ffmpeg中同步音视频流

音视频同步在转码之前，我门先来谈谈时间。换句话说播放器是如何实现音视频同步的，如何知道在什么时间播放一帧。上一个例子中，我门保存了一些帧。我们希望播放器以一定的节奏打印每个帧而不至于播放得太快或者太慢。因此我们需要引入一些机制来使播放流畅。为了达到这个目的，每个帧都有一个显示时间（pts），它是个递增的数据，并且是以一个时间基为基准，该时间基是一个有效数（他的分母被称为时间尺度）可以被帧率...

2019-03-05 16:00:02 406

原创【ffmpeg-libav-tutorial】ffmpeg的hello world

FFmpeg的hello worldffmpeg的hello world并不是打印hello world，而是打印视频的信息。比如他的容器格式、长度、分辨率、音频通道，最后我们将会解码一些帧并将他们保存为图片ffmpeg的架构首先先了解一下ffmpeg的架构以及他的组件如何与其他组件进行通信，如图是视频解码的过程：首先，我们需要将视频文件加载到AVFormatContext结构体，实际上...

2019-03-05 10:42:17 586

原创【ffmpeg-libav-tutorial】介绍——视频、音频、编码器、容器、使用方法

介绍——视频、音频、编码器、容器介绍视频——你所看到的音频编码器——数据压缩容器FFmpeg-命令行FFmpeg命令行工具介绍视频——你所看到的如果你有一序列的图片，并且以一个给定的频率来改变他们出现的时间（比如24张图片每秒），那么你就能看到一个运动的感觉。换句话来说，视频的基本思想就是：以一定的速率改变一系列图片的出现。音频虽然静音视频已经能够表达各种各样的感受，但是往视频里添加声...

2019-03-04 21:00:47 708

原创 LeetCode刷题——Array篇(Max Chunks To Make Sorted)

Given an array arr that is a permutation of [0, 1, …, arr.length - 1], we split the array into some number of “chunks” (partitions), and individually sort each chunk. After concatenating them, the re...

2018-05-17 15:16:48 153

原创 Linux搭建DNS服务器记录

1、安装后named -v查看版本号，方便查找相应教程2、编辑/etc/named.conf//// named.conf//// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS// server as a caching only nameserver (as a localh...

2018-05-15 11:34:55 1255

原创 LeetCode刷题——Array篇(Array Nesting)

A zero-indexed array A of length N contains all integers from 0 to N-1. Find and return the longest length of set S, where S[i] = {A[i], A[A[i]], A[A[A[i]]], … } subjected to the rule below.Suppose ...

2018-05-10 15:57:46 159

原创 LeetCode刷题——Array篇(Product of Array Except Self)

Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i].Example:Input: [1,2,3,4] Output: ...

2018-05-10 11:42:29 138

原创 LeetCode刷题——Array篇(Find All Duplicates in an Array)

Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.Find all the elements that appear twice in this array.Could you do it without extra ...

2018-05-10 11:37:44 146

原创 LeetCode刷题——Array篇(Maximum Average Subarray I)

Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximum average value. And you need to output the maximum average value.Example 1: Input: [1,12,...

2018-04-23 17:40:56 142

原创 LeetCode刷题——Array篇(Two Sum)

Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution, and you may not use the same ...

2018-04-23 14:50:39 173

原创 LeetCode刷题——Array篇(Find Pivot Index)

Given an array of integers nums, write a method that returns the “pivot” index of this array.We define the pivot index as the index where the sum of the numbers to the left of the index is equal to ...

2018-04-23 11:14:21 176

原创 LeetCode刷题——Array篇（Maximum Subarray）

Maximum SubarrayGiven an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.Example:Input: [-2,1,-3,4,-1,2,1,-5,4], O...

2018-04-20 14:56:35 208

原创 LeetCode刷题——Array篇(Move Zeroes和Remove Element)

Move ZeroesGiven an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non-zero elements.For example, given nums = [0, 1, 0, 3, 12], after ca...

2018-04-19 21:07:17 181

原创 LeetCode刷题——Array篇(Best Time to Buy and Sell Stock)

Say you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), d...

2018-04-18 16:26:17 196

原创 LeetCode刷题——Array篇(Min Cost Climbing Stairs)

On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed).Once you pay the cost, you can either climb one or two steps. You need to find minimum cost to reach the top of ...

2018-04-18 15:10:19 122

原创 LeetCode刷题——Array篇(Degree of an Array)

Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements.Your task is to find the smallest possible length of a ...

2018-04-18 14:16:36 112

转载 LeetCode刷题——Array篇(寻找两数和)

167. Two Sum II - Input array is sortedGiven an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.The function twoSum ...

2018-04-16 17:18:47 121

原创 LeetCode刷题——Array篇(Best Time to Buy and Sell Stock II)

Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one ...

2018-04-16 16:22:48 114

转载 LeetCode刷题——Array篇（对角线相等）

A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element.Now given an M x N matrix, return True if and only if the matrix is Toeplitz.Example 1:Input: matrix = [...

2018-04-12 14:27:57 330

转载 LeetCode刷题——Array篇(最大岛屿)

1、Max Area of IslandGiven a non-empty 2D array grid of 0’s and 1’s, an island is a group of 1’s (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges ...

2018-04-12 14:19:13 387

翻译【卡尔曼滤波器-Python】The g-h filter white white noise(白噪声)

用G-H滤波器减少白噪声用G-H滤波器减少白噪声白噪声的模拟不同初值对滤波结果影响白噪声的模拟这里采用numpy.random.randn()函数随机生成期望为0的有限变量，生成的过程即在原始数据上加上随机生成的噪声，定义如下的函数from numpy.random import randndef gen_data(x0,dx,count,noise_factor): return

2016-02-03 14:27:27 3963

翻译【卡尔曼滤波器-Python】The g-h filter

【卡尔曼滤波器-Python】The g-h filterThe g-h filter是kalman的基本思想。通过经验值来改进测量值，达到滤波的效果。举个例子，假如有一个人有一天的重量是160斤，并且接下来每天的体重都会增加一斤，但是我们通过体重计测得的数据分别如下所示[158.0, 164.2, 160.3, 159.9, 162.1, 164.6,169.6, 167.4, 166.4, 17

2016-01-29 16:52:40 9624 1

原创【卡尔曼滤波器-Python】Numpy基本函数

用python实现卡尔曼滤波器

2016-01-29 16:12:34 7489

原创【OPENCV】基于背景差法的运动目标检测

平台：VS2010+opencv 2.3.11、读取视频数据，并初始化相关的变量，如红框的初始值；2、灰度转化cvCvtColor；3、二值化cvThreshold；4、均值滤波cvSmooth；5、sobel算子cvSobel；6、腐蚀cvErode；7、膨胀cvDilate；8、逐帧比较，找出运动物体的边界；9、在原视频中，将运动物体的边界用红框标出；以

2015-04-23 10:30:48 4319 1

原创【OPENCV】图像的预处理（灰度图、二值化、字符矫正（旋转））

1、首先加载原始图片；2、cvCvtColor(img, source, CV_BGR2GRAY);转化成灰度图像；3、cvThreshold(source,source_gray,100,255,CV_THRESH_BINARY );进行二值化处理。由于原始的图片会有一定的角度，需要进行旋转，而旋转的话可以使用OPENCV提供的函数实现，本文中采用的是自己编写的，即通过旋转360，并

2014-12-17 21:41:40 14257 1

How NLP Cracked Transfer Learing

The year 2018 has been an inflection point for machine learning models handling text (or more accurately, Natural Language Processing or NLP for short). Our conceptual understanding of how best to represent words and sentences in a way that best captures underlying meanings and relationships is rapidly evolving. Moreover, the NLP community has been putting forward incredibly powerful components that you can freely download and use in your own models and pipelines . One of the latest milestones in this development is the release (https://ai.googleblog.com/2018/11/open-sourcing-bertstate- of-art-pre.html) of BERT (https://github.com/google-research/bert), an event described (https://twitter.com/lmthang/status/1050543868041555969) as marking the beginning of a new era in NLP. BERT is a model that broke several records for how well models can handle language-based tasks. Soon after the release of the paper describing the model, the team also open-sourced the code of the model, and made available for download versions of the model that were already pre-trained on massive datasets. This is a momentous development since it enables anyone building a machine learning model involving language processing to use this powerhouse as a readily-available component – saving the time, energy, knowledge, and resources that would have gone to training a language-processing model from scratch. (It’s been referred to as NLP’s ImageNet moment (http://ruder.io/nlp-imagenet/), referencing how years ago similar developments accelerated the development of machine learning in Computer Vision tasks)

2018-12-04

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How NLP Cracked Transfer Learing

【OPENCV】基于背景差法的运动目标检测

【OPENCV】图像的预处理（灰度图、二值化、字符矫正（旋转））

K-NN（K近邻算法）实现手写字符的识别（C语言）

libSVM的代码详细解析，注释非常详细

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