水铝英石

的黑市杂货铺和花销小玩意

水铝英石
水铝英石， 课内资料 allophane

ModernSignal_note2_wfdb

Waveform Database


python安装直接 pip install wfdb 然后就没有然后了
里面可能有用的就是这个示例，文档可以去这里

# import the WFDB package
import wfdb

# load a record using the 'rdrecord' function
record = wfdb.rdrecord('sample-data/a103l')

# plot the record to screen
wfdb.plot_wfdb(record=record, title='Example signals')

MATLAB安装
需要先安装java
这个可以在matlab命令行界面，直接选个风水比
较好的目录(在matlab中)
然后命令行运行

[old_path]=which('rdsamp'); if(~isempty(old_path)) rmpath(old_path(1:end-8)); end
wfdb_url='https://physionet.org/physiotools/matlab/wfdb-app-matlab/wfdb-app-toolbox-0-10-0.zip';
[filestr,status] = urlwrite(wfdb_url,'wfdb-app-toolbox-0-10-0.zip');
unzip('wfdb-app-toolbox-0-10-0.zip');
cd mcode
addpath(pwd)
savepath

当然，这等价于手动下载并解压 压缩包
把解压后下一层根目录添加到MATLAB的搜索路径里(主页/环境/设置路径)

好的现在可以在命令行
wfdbdemo
直接跑示例(注意这玩意会在上级刚才压缩包解压后的同级目录(不是子目录)下载示例数据，如果和之前数据集重复建议删除

文档可以查看这里《注意眼睛！》
那么之后就可以开始充分的调用各种格式的数据了

主要函数说明：

rdsamp 读入生理信号及其注释

[signal,Fs,tm]=rdsamp(recordName,signaList,N,N0,rawUnits,highResolution)

举例：在Matlab中输入以下内容通过rdsamp函数可以读出MITDB信号库中的一个recordName为‘100‘的信号并借助plot函数显示：

 [tm, signal]=rdsamp('mitdb/100',[],1000);
plot(tm,signal(:,1));

其中,该信号中有两列采集信号，每列长为650000个采样点，所以获得的signal应该是一个2*650000的矩阵。但是可以在函数输入可选项：

SignalList：选择其中某列信号读入，输入为空默认为全部列，此处就是默认全部；
N：需要读入信号的长度，本身信号长为650000，此处只截取了其中1000长度；
N0：截取信号开始的采样点，此处默认为1，也就是截取了信号的1–1000采样点；
rawUnits：信号读入信号值需要的精度，具体请看帮助；
highResolution：信号分辨率，1为高，0为低，默认为0

rdann 读入注释信息

[ann,type,subtype,chan,num,comments]=rdann(recordName,annotator,C,N,N0,type)

举例：

[tm, signal]=rdsamp('challenge/2013/set-a/a01');
[ann]=rdann('challenge/2013/set-a/a01','fqrs');
plot(tm,signal(:,1));hold on;grid on
plot(tm(ann),signal(ann,1),'ro','MarkerSize',4)

本程序首先用rdsamp函数读入‘challenge’信号库中的命名为‘a01’的全部信号，再用‘rdann’函数读入与之对应的注释信息，类型为‘fqrs’，也就是QRS出现的位置，最后由plot显示’Challenge’生理库中命名为‘a01’信号及其QRS注释信息
其中红色的圆点就是注释文件中标注QRS出现的地方。其实注释信息我们可以通过一些算法求出来的，但是既然生理库中已经给出我们就可以直接用，而且他们官方的肯定经过矫正很准确的，既方便也有保证，直接拿来用何乐不为？另外如果我们想自己开发检测QRS或者R，可以将自己得到的结果和官方的注释信息对比，看看自己算法的准确率。

由于官方文档主页实在是太护眼了！直接搬运一下

Contents

Introduction

FAQ

Applications

  • a2m, ad2m, ahaconvert, ahaecg2mit, m2a, md2a: converting between AHA DB and WFDB formats
  • ann2rr, rr2ann: convert annotation files to interval lists and vice versa
  • bxb: ANSI/AAMI-standard beat-by-beat annotation comparator
  • calsig: calibrate signals of a WFDB record
  • coherence: estimate coherence and cross-spectrum of two time series
  • dfa: detrended fluctuation analysis
  • ecgeval: generate and run ECG analyzer evaluation script
  • ecgpuwave: QRS detector and waveform limit locator
  • edf2mit, mit2edf: convert between EDF and WFDB-compatible formats
  • edr: derive a respiration signal from an ECG
  • epicmp: ANSI/AAMI-standard episode-by-episode annotation comparator
  • fft: fast Fourier transform
  • fir: general-purpose FIR filter for WFDB records
  • gqfuse: combine QRS annotation files
  • gqrs, gqpost: QRS detector and post-processor
  • hrfft, hrlomb, hrmem: calculate and plot heart rate power spectra
  • hrstats: collect and summarize heart rate statistics from an annotation file
  • ihr: calculate instantaneous heart rate
  • imageplt: plot a greyscale image
  • log10: calculate common logarithms of two-column data
  • lomb: estimate power spectrum using the Lomb periodogram method
  • lwcat: postprocess output of plt to make PostScript, EPS, PDF or PNG
  • memse: estimate power spectrum using maximum entropy (all poles) method
  • mfilt: general-purpose median filter for WFDB records
  • mrgann: merge annotation files
  • mxm: ANSI/AAMI-standard measurement-by-measurement annotation comparator
  • nguess: guess the times of missing normal beats in an annotation file
  • nst: noise stress test for ECG analysis programs
  • parsescp: parse SCP-ECG, optionally save in PhysioBank-compatible format
  • plot2d, plot3d: make 2-D or 3-D plots from text files of data, using gnuplot
  • plotstm: produce scatter plot of ST measurement errors on a PostScript device
  • plt: make 2-D plots
  • pltf: make function plots
  • pnnlist, pNNx: derive pNNx statistics from an annotation interval list or an annotation file
  • pnwlogin: provide direct access to PhysioNetWorks for WFDB applications
  • pschart: produce annotated `chart recordings’ on a PostScript device
  • psfd: produce annotated `full-disclosure’ plots on a PostScript device
  • rdann: read a WFDB annotation file
  • rdedfann: extract annotations from an EDF+ file
  • rdsamp: read WFDB signal files
  • rxr: ANSI/AAMI-standard run-by-run annotation comparator
  • sampfreq: show sampling frequency for a record
  • setwfdb, cshsetwfdb: set WFDB environment variables
  • sigamp: measure signal amplitudes of a WFDB record
  • sigavg: calculate averages of annotated waveforms
  • signame: print names of signals of a WFDB record
  • signum: print signal numbers of a WFDB record having specified names
  • skewedit: edit skew fields of header file(s)
  • snip: copy an excerpt of a WFDB record
  • sortann: rearrange annotations in canonical order
  • sqrs, sqrs125: single-channel QRS detector
  • stepdet: single-channel step change detector
  • sumann: summarize the contents of a WFDB annotation file
  • sumstats: derive aggregate statistics from bxb, rxr, etc., line-format output
  • tach: heart rate tachometer
  • time2sec: convert WFDB standard time format into seconds
  • wabp: arterial blood pressure (ABP) pulse detector
  • wav2mit, mit2wav: convert between .wav and WFDB-compatible formats
  • wave: waveform analyzer, viewer, and editor
  • wfdb-config: print WFDB library version and configuration info
  • wfdb2mat: convert WFDB-compatible signal file to Matlab .mat file
  • wfdbcat: copy WFDB files to standard output
  • wfdbcollate: collate WFDB records into a multi-segment record
  • wfdbdesc: read signal specifications
  • wfdbmap: make a synoptic map of a WFDB record
  • wfdbtime: convert time to sample number, elapsed, and absolute time
  • wfdbwhich: find a WFDB file and print its pathname
  • wqrs: single-channel QRS detector based on length transform
  • wrann: write a WFDB annotation file
  • wrsamp: write WFDB signal files
  • xform: sampling frequency, amplitude, and format conversion for WFDB records

WFDB libraries

  • wfdb: Waveform Database library
  • wfdbf: Waveform Database library wrappers for Fortran

WFDB file formats

  • annot: WFDB annotation file formats
  • header: WFDB header file format
  • signal: WFDB signal file formats
  • wfdbcal: WFDB calibration file format

Miscellaneous

  • xview: xview toolkit information

Appendices

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