JavaCPP初体验
初体验
2023-09-14 09:01:36 时间
Bytedeco通过提供使用共同开发的JavaCPP技术生成的即用型绑定，使本机库可用于Java平台。 我们希望这是Java和C / C ++之间缺少的桥梁，它将计算密集型科学，多媒体，计算机视觉，深度学习等带入Java平台。
一、初步了解
支持非常多的类库啊，下图只是官网的一小部分，真是感觉幸福。
使用方便：Maven网站里面
https://mvnrepository.com/search?q=javacpp-presets
https://mvnrepository.com/search?q=JavaCPP+Presets+Platform+For
找到添加依赖就可以用了。
开发入门，及参考网址：
javacv开发入门之Maven环境搭建_qi531621028的博客-CSDN博客_javacv maven、
CentOS 下通过 JavaCPP 调用 FFMPEG_jTeam的专栏-CSDN博客
JavaCPP 技术使用经验总结_程序是有生命的精灵-CSDN博客_javacpp
二、试用FFMpeg
新建spring boot项目，添加依赖如下：
<dependency>
<groupId>org.bytedeco.javacpp-presets</groupId>
<artifactId>ffmpeg-platform</artifactId>
<version>4.1-1.4.4</version>
</dependency>
<dependency>
<groupId>org.bytedeco.javacpp-presets</groupId>
<artifactId>opencv-platform</artifactId>
<version>4.0.1-1.4.4</version>
</dependency>视频截取：
public int cutVideo(double from_seconds, double end_seconds, String in_filename, String out_filename){
AVOutputFormat ofmt = null;
AVFormatContext ifmt_ctx = new AVFormatContext(null);
AVFormatContext ofmt_ctx = new AVFormatContext(null);
AVPacket pkt = new AVPacket();
int ret, i;
try{
av_register_all();
if (avformat_open_input(ifmt_ctx, in_filename, null, null) < 0) {
return -1;
}
if ((ret = avformat_find_stream_info(ifmt_ctx, (PointerPointer<Pointer>) null)) < 0) {
return -1;
}
av_dump_format(ifmt_ctx, 0, in_filename, 0);
avformat_alloc_output_context2(ofmt_ctx, null, null, out_filename);
if (ofmt_ctx == null) {
return -1;
}
ofmt = ofmt_ctx.oformat();
for (i = 0; i < ifmt_ctx.nb_streams(); i++) {
AVStream in_stream = ifmt_ctx.streams(i);
AVStream out_stream = avformat_new_stream(ofmt_ctx, in_stream.codec().codec());
if (out_stream == null) {
return -1;
}
ret = avcodec_copy_context(out_stream.codec(), in_stream.codec());
if (ret < 0) {
return -1;
}
out_stream.codec().codec_tag(0);
if ((ofmt_ctx.oformat().flags() & AVFMT_GLOBALHEADER) > 0)
ofmt_ctx.oformat().flags(ofmt_ctx.oformat().flags() | AV_CODEC_FLAG_GLOBAL_HEADER) ;
}
av_dump_format(ofmt_ctx, 0, out_filename, 1);
if ((ofmt.flags() & AVFMT_NOFILE) == 0) {
AVIOContext pb = new AVIOContext();
ret = avio_open(pb, out_filename, AVIO_FLAG_WRITE);
if (ret < 0) {
return -1;
}
ofmt_ctx.pb(pb);
}
ret = avformat_write_header(ofmt_ctx, (PointerPointer<Pointer>)null);
if (ret < 0) {
return -1;
}
// int64_t start_from = 8*AV_TIME_BASE;
ret = av_seek_frame(ifmt_ctx, -1, new Double(from_seconds*AV_TIME_BASE).longValue(), AVSEEK_FLAG_ANY);
if (ret < 0) {
return -1;
}
// int dts_start_from = ifmt_ctx.nb_streams();
// av_memcpy_backptr(dts_start_from, 0, ifmt_ctx.nb_streams());
// int64_t *pts_start_from = malloc(sizeof(int64_t) * ifmt_ctx->nb_streams);
// memset(pts_start_from, 0, sizeof(int64_t) * ifmt_ctx->nb_streams);
long[] dts_start_from = new long[ifmt_ctx.nb_streams()];
Arrays.fill(dts_start_from, 0);
long[] pts_start_from = new long[ifmt_ctx.nb_streams()];
Arrays.fill(pts_start_from, 0);
while (true) {
AVStream in_stream, out_stream;
ret = av_read_frame(ifmt_ctx, pkt);
if (ret < 0)
break;
in_stream = ifmt_ctx.streams(pkt.stream_index());
out_stream = ofmt_ctx.streams(pkt.stream_index());
//log_packet(ifmt_ctx, pkt, "in");
if (av_q2d(in_stream.time_base()) * pkt.pts() > end_seconds) {
av_free_packet(pkt);
break;
}
if (dts_start_from[pkt.stream_index()] == 0) {
dts_start_from[pkt.stream_index()] = pkt.dts();
//printf("dts_start_from: %s\n", av_ts2str(dts_start_from[pkt.stream_index()]));
}
if (pts_start_from[pkt.stream_index()] == 0) {
pts_start_from[pkt.stream_index()] = pkt.pts();
//printf("pts_start_from: %s\n", av_ts2str(pts_start_from[pkt.stream_index]));
}
/* copy packet */
pkt.pts(av_rescale_q_rnd(pkt.pts() - pts_start_from[pkt.stream_index()], in_stream.time_base(), out_stream.time_base(), AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts(av_rescale_q_rnd(pkt.dts() - dts_start_from[pkt.stream_index()], in_stream.time_base(), out_stream.time_base(), AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
if (pkt.pts() < 0) {
pkt.pts(0);
}
if (pkt.dts() < 0) {
pkt.dts(0);
}
pkt.duration((int)av_rescale_q((int)pkt.duration(), in_stream.time_base(), out_stream.time_base()));
pkt.pos(-1);
//log_packet(ofmt_ctx, &pkt, "out");
//printf("\n");
ret = av_interleaved_write_frame(ofmt_ctx, pkt);
if (ret < 0) {
//fprintf(stderr, "Error muxing packet\n");
break;
}
av_free_packet(pkt);
}
dts_start_from = new long[0];
pts_start_from = new long[0];
av_write_trailer(ofmt_ctx);
return 0;
} finally {
avformat_close_input(ifmt_ctx);
/* close output */
if (ofmt_ctx!=null && (ofmt.flags() & AVFMT_NOFILE)==0)
avio_closep(ofmt_ctx.pb());
avformat_free_context(ofmt_ctx);
// if (ret < 0 && ret != AVERROR_EOF) {
// fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
// return 1;
// }
}查看视频信息
public int info(int argc, String[] argv){
AVFormatContext fmt_ctx = avformat_alloc_context();
AVDictionaryEntry tag = null;
if (argc != 2) {
log.error("usage: %s <input_file> example program to demonstrate the use of the libavformat metadata API.", argv[0]);
return 1;
}
if (avformat_open_input(fmt_ctx, argv[1], null, null)!=0){
return -1;
}
log.info("视频时长:" + fmt_ctx.duration());
//tag = av_dict_get(fmt_ctx.metadata(), "", tag, AV_DICT_IGNORE_SUFFIX);
// while ((tag = av_dict_get(fmt_ctx.metadata(), "", tag, AV_DICT_IGNORE_SUFFIX))){
// log.info("%s=%s\n", tag.key(), tag.value());
// }
avformat_close_input(fmt_ctx);
return 0;
}截取视频某一帧图片
/**
* 打开视频流或者视频文件，并解码视频帧为YUVJ420P数据
*
* @param url -视频源地址
* @param out_file 截图文件保存地址
* @param time 秒 0开始
* @author eguid
* @throws IOException
*/
public int openVideo(String url,String out_file, double time) throws IOException {
avformat.AVFormatContext pFormatCtx = new avformat.AVFormatContext(null);
int i, videoStream;
avcodec.AVCodecContext pCodecCtx = null;
avcodec.AVCodec pCodec = null;
avutil.AVFrame pFrame = null;
avcodec.AVPacket packet = new avcodec.AVPacket();
int[] frameFinished = new int[1];
avutil.AVDictionary optionsDict = null;
avutil.AVFrame pFrameRGB = null;
int numBytes;
BytePointer buffer = null;
swscale.SwsContext sws_ctx = null;
// Open video file
if (avformat_open_input(pFormatCtx, url, null, null) != 0) {
return -1; // Couldn't open file
}
// Retrieve stream information
if (avformat_find_stream_info(pFormatCtx, (PointerPointer<Pointer>) null) < 0) {
return -1;// Couldn't find stream information
}
// Dump information about file onto standard error
av_dump_format(pFormatCtx, 0, url, 0);
log.info("nbstreams:"+pFormatCtx.nb_streams());
// Find the first video stream
videoStream = -1;
for (i = 0; i < pFormatCtx.nb_streams(); i++) {
if (pFormatCtx.streams(i).codec().codec_type() == AVMEDIA_TYPE_VIDEO) {
videoStream = i;
break;
}
}
if (videoStream == -1) {
return -1; // Didn't find a video stream
}
// Get a pointer to the codec context for the video stream
pCodecCtx = pFormatCtx.streams(videoStream).codec();
// Find the decoder for the video stream
pCodec = avcodec_find_decoder(pCodecCtx.codec_id());
if (pCodec == null) {
System.err.println("Unsupported codec!");
return -1; // Codec not found
}
// Open codec
if (avcodec_open2(pCodecCtx, pCodec, optionsDict) < 0) {
return -1; // Could not open codec
}
pFrame = av_frame_alloc();// Allocate video frame
// Allocate an AVFrame structure
pFrameRGB = av_frame_alloc();
if (pFrameRGB == null) {
return -1;
}
int width = pCodecCtx.width(), height = pCodecCtx.height();
pFrameRGB.width(width);
pFrameRGB.height(height);
pFrameRGB.format(AV_PIX_FMT_YUVJ420P);
// Determine required buffer size and allocate buffer
numBytes = av_image_get_buffer_size(AV_PIX_FMT_YUVJ420P, width, height, 1);
buffer = new BytePointer(av_malloc(numBytes));
sws_ctx = sws_getContext(pCodecCtx.width(), pCodecCtx.height(), pCodecCtx.pix_fmt(), pCodecCtx.width(),
pCodecCtx.height(), AV_PIX_FMT_YUVJ420P, SWS_BICUBIC, null, null, (DoublePointer) null);
// Assign appropriate parts of buffer to image planes in pFrameRGB
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
// of AVPicture
avpicture_fill(new AVPicture(pFrameRGB), buffer, AV_PIX_FMT_YUVJ420P, pCodecCtx.width(), pCodecCtx.height());
// Read frames and save first five frames to disk
int ret=-1;
// 如果seek的时间大于0，则进行seek，否则取第一帧
if(time>0){
Long l = new Double(time/av_q2d(pFormatCtx.streams(videoStream).time_base())).longValue();
log.info(""+l);
if(av_seek_frame(pFormatCtx,videoStream,l,AVSEEK_FLAG_BACKWARD) < 0){
return -1;
}
}
while (av_read_frame(pFormatCtx, packet) >= 0) {
if (packet.stream_index() == videoStream) {// Is this a packet from the video stream?
//avcodec_decode_video2(pCodecCtx, pFrame, frameFinished, packet);// Decode video frame
avcodec_send_packet(pCodecCtx,packet);
avcodec_receive_frame(pCodecCtx,pFrame);
// Did we get a video frame?
//if (frameFinished != null) {
// 转换图像格式，将解压出来的YUV420P的图像转换为YUVJ420P的图像
sws_scale(sws_ctx, pFrame.data(), pFrame.linesize(), 0, pCodecCtx.height(), pFrameRGB.data(),
pFrameRGB.linesize());
//}
//if (frameFinished[0] != 0 && !pFrame.isNull()) {
// Convert the image from its native format to YUVJ420P
sws_scale(sws_ctx, pFrame.data(), pFrame.linesize(), 0, pCodecCtx.height(), pFrameRGB.data(),pFrameRGB.linesize());
if((ret=saveImg(pFrameRGB,out_file))>=0) {
break;
}
//}
}
}
av_packet_unref(packet);// Free the packet that was allocated by av_read_frame
// Free the RGB image
av_free(buffer);
av_free(pFrameRGB);
av_free(pFrame);// Free the YUV frame
avcodec_close(pCodecCtx);// Close the codec
avformat_close_input(pFormatCtx);// Close the video file
return ret;
}
/**
* 把YUVJ420P数据编码保存成jpg图片
*
* @param pFrame -图像帧
* @param out_file -截图文件保存地址
* @author eguid
* @return
*/
private int saveImg(AVFrame pFrame, String out_file) {
AVPacket pkt = null;
AVStream pAVStream = null;
AVCodec codec = null;
int ret = -1;
int width = pFrame.width(), height = pFrame.height();
// 分配AVFormatContext对象
AVFormatContext pFormatCtx = avformat_alloc_context();
// 设置输出文件格式
pFormatCtx.oformat(av_guess_format("mjpeg", null, null));
if (pFormatCtx.oformat() == null) {
return -1;
}
try {
// 创建并初始化一个和该url相关的AVIOContext
AVIOContext pb = new AVIOContext();
if (avio_open(pb, out_file, AVIO_FLAG_READ_WRITE) < 0) {// dont open file
return -1;
}
pFormatCtx.pb(pb);
// 构建一个新stream
pAVStream = avformat_new_stream(pFormatCtx, codec);
if (pAVStream == null) {
return -1;
}
int codec_id = pFormatCtx.oformat().video_codec();
// 设置该stream的信息
// AVCodecContext pCodecCtx = pAVStream.codec();
AVCodecContext pCodecCtx = pAVStream.codec();
pCodecCtx.codec_id(codec_id);
pCodecCtx.codec_type(AVMEDIA_TYPE_VIDEO);
pCodecCtx.pix_fmt(AV_PIX_FMT_YUVJ420P);
pCodecCtx.width(width);
pCodecCtx.height(height);
pCodecCtx.time_base().num(1);
pCodecCtx.time_base().den(25);
// Begin Output some information
av_dump_format(pFormatCtx, 0, out_file, 1);
// End Output some information
// 查找解码器
AVCodec pCodec = avcodec_find_encoder(codec_id);
if (pCodec == null) {// codec not found
return -1;
}
// 设置pCodecCtx的解码器为pCodec
if (avcodec_open2(pCodecCtx, pCodec, (PointerPointer<Pointer>) null) < 0) {
System.err.println("Could not open codec.");
return -1;
}
// Write Header
avformat_write_header(pFormatCtx, (PointerPointer<Pointer>) null);
// 给AVPacket分配足够大的空间
pkt = new AVPacket();
if (av_new_packet(pkt, width * height * 3) < 0) {
return -1;
}
int[] got_picture = {0};
// encode
if (avcodec_encode_video2(pCodecCtx, pkt, pFrame, got_picture) >= 0) {
// flush
if ((ret = av_write_frame(pFormatCtx, pkt)) >= 0) {
// Write Trailer
if (av_write_trailer(pFormatCtx) >= 0) {
System.err.println("Encode Successful.");
}
}
}
return ret;
// 结束时销毁
} finally {
if (pkt != null) {
av_packet_unref(pkt);
}
if (pAVStream != null) {
avcodec_close(pAVStream.codec());
}
if (pFormatCtx != null) {
avio_close(pFormatCtx.pb());
avformat_free_context(pFormatCtx);
}
}
}音频处理：
public int info(int argc, String[] argv){
AVFormatContext fmt_ctx = avformat_alloc_context();
AVDictionary dict = new AVDictionary();
AVDictionaryEntry tag = null;
if (argc != 2) {
log.error("usage: %s <input_file> example program to demonstrate the use of the libavformat metadata API.", argv[0]);
return 1;
}
if (avformat_open_input(fmt_ctx, argv[1], null, null)!=0){
return -1;
}
if (avformat_find_stream_info(fmt_ctx, dict)!=0) {
// LOGE("Error find stream information: %d (Streams: %d)", lError, pFormatCtx->nb_streams);
return -1;
}
int streamsCount = fmt_ctx.nb_streams();
log.info("有几路流:" + streamsCount);
log.info("时长:" + fmt_ctx.nb_streams(streamsCount).duration());
// 读取详细信息
while ((tag = av_dict_get(fmt_ctx.metadata(), "", tag, AV_DICT_IGNORE_SUFFIX))!=null)
{
log.info("key:" + tag.key().getString().toString());
log.info("key:" + tag.value().getString().toString());
}
avformat_close_input(fmt_ctx);
return 0;
}
public int cutAudio(double from_seconds, double end_seconds, String in_filename, String out_filename){
AVOutputFormat ofmt = null;
AVFormatContext ifmt_ctx = new AVFormatContext(null);
AVFormatContext ofmt_ctx = new AVFormatContext(null);
avcodec.AVPacket pkt = new avcodec.AVPacket();
int ret, i;
try{
av_register_all();
if (avformat_open_input(ifmt_ctx, in_filename, null, null) < 0) {
return -1;
}
if ((ret = avformat_find_stream_info(ifmt_ctx, (PointerPointer<Pointer>) null)) < 0) {
return -1;
}
av_dump_format(ifmt_ctx, 0, in_filename, 0);
avformat_alloc_output_context2(ofmt_ctx, null, null, out_filename);
if (ofmt_ctx == null) {
return -1;
}
ofmt = ofmt_ctx.oformat();
for (i = 0; i < ifmt_ctx.nb_streams(); i++) {
AVStream in_stream = ifmt_ctx.streams(i);
AVStream out_stream = avformat_new_stream(ofmt_ctx, in_stream.codec().codec());
if (out_stream == null) {
return -1;
}
ret = avcodec_copy_context(out_stream.codec(), in_stream.codec());
if (ret < 0) {
return -1;
}
out_stream.codec().codec_tag(0);
if ((ofmt_ctx.oformat().flags() & AVFMT_GLOBALHEADER) > 0)
ofmt_ctx.oformat().flags(ofmt_ctx.oformat().flags() | AV_CODEC_FLAG_GLOBAL_HEADER) ;
}
av_dump_format(ofmt_ctx, 0, out_filename, 1);
if ((ofmt.flags() & AVFMT_NOFILE) == 0) {
AVIOContext pb = new AVIOContext();
ret = avio_open(pb, out_filename, AVIO_FLAG_WRITE);
if (ret < 0) {
return -1;
}
ofmt_ctx.pb(pb);
}
ret = avformat_write_header(ofmt_ctx, (PointerPointer<Pointer>)null);
if (ret < 0) {
return -1;
}
// int64_t start_from = 8*AV_TIME_BASE;
ret = av_seek_frame(ifmt_ctx, -1, new Double(from_seconds*AV_TIME_BASE).longValue(), AVSEEK_FLAG_ANY);
if (ret < 0) {
return -1;
}
// int dts_start_from = ifmt_ctx.nb_streams();
// av_memcpy_backptr(dts_start_from, 0, ifmt_ctx.nb_streams());
// int64_t *pts_start_from = malloc(sizeof(int64_t) * ifmt_ctx->nb_streams);
// memset(pts_start_from, 0, sizeof(int64_t) * ifmt_ctx->nb_streams);
long[] dts_start_from = new long[ifmt_ctx.nb_streams()];
Arrays.fill(dts_start_from, 0);
long[] pts_start_from = new long[ifmt_ctx.nb_streams()];
Arrays.fill(pts_start_from, 0);
while (true) {
AVStream in_stream, out_stream;
ret = av_read_frame(ifmt_ctx, pkt);
if (ret < 0)
break;
in_stream = ifmt_ctx.streams(pkt.stream_index());
out_stream = ofmt_ctx.streams(pkt.stream_index());
//log_packet(ifmt_ctx, pkt, "in");
if (av_q2d(in_stream.time_base()) * pkt.pts() > end_seconds) {
av_free_packet(pkt);
break;
}
if (dts_start_from[pkt.stream_index()] == 0) {
dts_start_from[pkt.stream_index()] = pkt.dts();
//printf("dts_start_from: %s\n", av_ts2str(dts_start_from[pkt.stream_index()]));
}
if (pts_start_from[pkt.stream_index()] == 0) {
pts_start_from[pkt.stream_index()] = pkt.pts();
//printf("pts_start_from: %s\n", av_ts2str(pts_start_from[pkt.stream_index]));
}
/* copy packet */
pkt.pts(av_rescale_q_rnd(pkt.pts() - pts_start_from[pkt.stream_index()], in_stream.time_base(), out_stream.time_base(), AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts(av_rescale_q_rnd(pkt.dts() - dts_start_from[pkt.stream_index()], in_stream.time_base(), out_stream.time_base(), AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
if (pkt.pts() < 0) {
pkt.pts(0);
}
if (pkt.dts() < 0) {
pkt.dts(0);
}
pkt.duration((int)av_rescale_q((int)pkt.duration(), in_stream.time_base(), out_stream.time_base()));
pkt.pos(-1);
//log_packet(ofmt_ctx, &pkt, "out");
//printf("\n");
ret = av_interleaved_write_frame(ofmt_ctx, pkt);
if (ret < 0) {
//fprintf(stderr, "Error muxing packet\n");
break;
}
av_free_packet(pkt);
}
dts_start_from = new long[0];
pts_start_from = new long[0];
av_write_trailer(ofmt_ctx);
return 0;
} finally {
avformat_close_input(ifmt_ctx);
/* close output */
if (ofmt_ctx!=null && (ofmt.flags() & AVFMT_NOFILE)==0)
avio_closep(ofmt_ctx.pb());
avformat_free_context(ofmt_ctx);
// if (ret < 0 && ret != AVERROR_EOF) {
// fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
// return 1;
// }
}三、试用OpenCV
车牌识别
package com.joinway.platform.admin.carno;
import java.math.BigDecimal;
import java.util.Vector;
import com.joinway.platform.admin.carno.core.CharsRecognise;
import com.joinway.platform.admin.carno.core.PlateDetect;
import org.bytedeco.javacpp.opencv_imgcodecs;
import org.bytedeco.javacpp.opencv_core.Mat;
/**
* 车牌识别
* @author eguid
*
*/
public class PlateRecognition {
static PlateDetect plateDetect =null;
static CharsRecognise cr=null;
static{
plateDetect=new PlateDetect();
plateDetect.setPDLifemode(true);
cr = new CharsRecognise();
}
/**
* 单个车牌识别
* @param mat
* @return
*/
public static String plateRecognise(Mat mat){
Vector<Mat> matVector = new Vector<Mat>(1);
if (0 == plateDetect.plateDetect(mat, matVector)) {
if(matVector.size()>0){
return cr.charsRecognise(matVector.get(0));
}
}
return null;
}
/**
* 多车牌识别
* @param mat
* @return
*/
public static String[] mutiPlateRecognise(Mat mat){
PlateDetect plateDetect = new PlateDetect();
plateDetect.setPDLifemode(true);
Vector<Mat> matVector = new Vector<Mat>(10);
if (0 == plateDetect.plateDetect(mat, matVector)) {
CharsRecognise cr = new CharsRecognise();
String[] results=new String[matVector.size()];
for (int i = 0; i < matVector.size(); ++i) {
String result = cr.charsRecognise(matVector.get(i));
results[i]=result;
}
return results;
}
return null;
}
/**
* 单个车牌识别
* @param imgPath
* @return
*/
public static String plateRecognise(String imgPath){
Mat src = opencv_imgcodecs.imread(imgPath);
return plateRecognise(src);
}
/**
* 多车牌识别
* @param imgPath
* @return
*/
public static String[] mutiPlateRecognise(String imgPath){
Mat src = opencv_imgcodecs.imread(imgPath);
return mutiPlateRecognise(src);
}
public static void main(String[] args){
int sum=100;
int errNum=0;
int sumTime=0;
long longTime=0;
for(int i=sum;i>0;i--){
String imgPath = "res/image/test_image/plate_judge.jpg";
Mat src = opencv_imgcodecs.imread(imgPath);
long now =System.currentTimeMillis();
String ret=plateRecognise(src);
System.err.println(ret);
long s=System.currentTimeMillis()-now;
if(s>longTime){
longTime=s;
}
sumTime+=s;
if(!"川A0CP56".equals(ret)){
errNum++;
}
}
System.err.println("总数量："+sum);
System.err.println("单次最长耗时："+longTime+"ms");
BigDecimal errSum=new BigDecimal(errNum);
BigDecimal sumNum=new BigDecimal(sum);
BigDecimal c=sumNum.subtract(errSum).divide(sumNum).multiply(new BigDecimal(100));
System.err.println("总耗时："+sumTime+"ms,平均处理时长："+sumTime/sum+"ms,错误数量："+errNum+"，正确识别率："+c+"%");
}
}