Question

我在link here运行稀疏光流演示，我只是想在视频中所有帧之间跟踪的单个点之间划一条线。

在for循环中，

int LastX = 0;
int LastY = 0;
int px, py;


else if( !points[0].empty() )
  {
    vector<uchar> status;
     vector<float> err;
     if(prevGray.empty())
      gray.copyTo(prevGray);
      calcOpticalFlowPyrLK(prevGray, gray, points[0], points[1], status, err, winSize,
                                     3, termcrit, 0, 0.001);
      size_t i, k;
    for( i = k = 0; i < points[1].size(); i++ )
       {
         if( addRemovePt )
           {
              if( norm(point - points[1][i]) <= 5 )
                 {
                    addRemovePt = false;
                    continue;
                  }
             }

          if( !status[i] )
          continue;
          points[1][k++] = points[1][i];

           px = points[1][i].x;
           py = points [1][i].y;

       if (LastX > 0)
          {
            line(image, Point(px, py), Point(LastX, LastY), Scalar(255, 0, 0), 5);
          }

         LastX = px;
         LastY = py;
         circle( image, points[1][i], 3, Scalar(0,255,0), -1, 8);
      }
        points[1].resize(k);

    }

但是，该行仅出现在当前帧中，并且该行的位置不会保存在先前帧中。有人可以告诉我我做错了吗？

Answer 1

尝试使用JavaSparkContext context = ......; //Retrieve list of files from master file List<String> files = context.textFile("/somepath/catmydata.csv") .flatMap(row->Arrays.asList(row.split(",")).iterator()).collect(); //Iterate through each file and save it as object file Map<String,JavaRDD<Cat>> adoptedCatsMap =new HashMap<String,JavaRDD<Cat>>(); for (String file:files) { // Extract file path and attach to convert String output=String.format("/convertedcatdata/%s",file.substring(file.indexOf('/'),file.length())) JavaRDD<Cat> adoptedCatsRdd = context.textFile(file).map(s->new Cat(s)); adoptedCatsMap.put(output,adoptedCatsRdd); //This will write number of files based on rdd partitions, // if you want only one file in a directory then save it // to temporary directory then use copyMerge to create one file using Hadoop fs FileUtil // https://hadoop.apache.org/docs/r2.7.1/api/org/apache/hadoop/fs/FileUtil.html //Save to physical location if required. adoptedCatsRdd.saveAsObjectFile(output); }存储从第一帧到最后一帧的匹配点对。

流点的匹配过程与汽车追踪类似。

你可以参考这个Counting cars by Dan Mašek。

在运行光流追踪时，在每个帧中的点之间绘制一条线

1 个答案: