实验37 综合实战：车牌识别

实验三十七

综合实战：车牌识别

37.1

实验目的

基于

MapReduce

思想，编写车牌识别程序。实现对江苏 某两处监控图片中的车牌的

识别，完成对除江苏省车辆外的外省车辆的统计，并完成对两 处监控中套牌车辆的识别，

并得出结果。

37.2

实验要求

要能理解

< br>MapReduce

编程思想，会编写

MapReduc e

车牌识别程序，能够利用

Java

调

用已封装好

C++

的

< br>so

动态库完成车牌的识别，然后利用

MapReduc e

完成对车牌的统计和

对套牌车的识别。最后将其执行并分析执 行过程。

37.3

实验步骤

37.3.1

编写程序

对于外省车牌的统计，我们可以理解为

WordCount

程序 ，利用

WordCount

的思想，

在

Reduce

阶段对

“

苏

”

车牌不进行输出即可。

对于套牌车辆的识别，

Map

阶段与< /p>

WordCount

是一样的，在

Red uce

阶段我们将统计

相同车牌出现的情况。

< br>

我们将编写两个类，一个类用于加载

C++

so

动态库，另一个完成

MapReduce

算

法。

import

import ;

public class SelectPic {

private Vector pics = null;

public SelectPic() {

}

pics = new Vector<>();

实验手册

static {

}

public native String getPlate(String inPath);

public void doPicNames(String inPath) {

}

public static void main(String[] args) {

}

}

SelectPic sp = new SelectPic();

ames(

File file = new File(inPath);

File[] listFiles = les();

for (File files : listFiles) {

}

if (!ctory()) {

}

String name = e();

String plate = getPlate(inPath +

if (() > 3)

ing(3);

brary(

import ption;

import

import uration;

import stem;

import

import table;

import itable;

import itable;

import

import leComparable;

import leComparator;

import

import

208

实验手册

import r;

import putFormat;

import tputFormat;

import cOptionsParser;

public class PlateRecog {

public static class PlateRecogMapper_coll extends Mapper {

}

//

统计非江苏的车牌的数量

public static class PlateRecogReducer_coll extends Reducer {

@Override

protected void reduce(Text k2, Iterable v2s,

Reducer.Context context)

@Override

protected void map(LongWritable key, Text value, Mapper

}

throws IOException, InterruptedException {

@Override

protected void setup(Mapper.Context context)

}

throws IOException, InterruptedException {

Configuration conf = figuration();

sp = new SelectPic();

HDFS = (conf);

private SelectPic sp = null;

private FileSystem HDFS = null;

IntWritable>.Context context)

String[] splits = ng().split(

String ds = splits[0].substring(0, splits[0].length() - 4) +

Path src = new Path(splits[0]);

Path dst = new Path(ds);

LocalFile(src, dst);

String plate = te(ds);

plate = ing(3);

(new Text(ing(0, 1)), new IntWritable(1));

207

实验手册

}

public static class PlateRecogMapper_find extends Mapper {

context)

6)));

//

皖

A12345_1 45

(new Text(plateInfo), new Text(e().substring(0, e().length() -

throws IOException, InterruptedException {

String[] splits = ng().split(

String ds = splits[0].substring(0, splits[0].length() - 4) +

Path src = new Path(splits[0]);

Path dst = new Path(ds);

LocalFile(src, dst);

String plate = te(ds);

plate = ing(3);

String plateInfo = plate + '_' + splits[1];

@Override

protected void map(LongWritable key, Text value, Mapper.Context

@Override

protected void setup(Mapper.Context context)

}

throws IOException, InterruptedException {

Configuration conf = figuration();

sp = new SelectPic();

HDFS = (conf);

private SelectPic sp = null;

private FileSystem HDFS = null;

}

}

throws IOException, InterruptedException {

int sum = 0;

for (IntWritable v2 : v2s) {

}

(new Text(ng() +

车牌的数量：

sum += ();

if (!ng().equals(

苏

208

实验手册

}

public static class PlateRecogReducer_find extends Reducer {

context)

}

public static class findGroupComparator extends WritableComparator {

protected findGroupComparator() {

super(, true);//

注册

comparator

}

throws IOException, InterruptedException {

int sum = 0;

String[] splits = ng().split(

();

for (Text v2 : v2s) {

}

if (sum > 1) {

}

String sameplate =

for (int i = 0; i < () - 1; ++i) {

}

sameplate += (() - 1);

(new Text(

存在套牌的车辆的车牌号为

:

车牌编号为：

sameplate += (i) +

和

++sum;

(ng());

@Override

protected void reduce(Text k2, Iterable v2s, Reducer.Context

@Override

protected void setup(Reducer.Context context)

}

throws IOException, InterruptedException {

samePlates = new Vector<>();

private Vector samePlates = null;

}

207