在Matlab中使用parfor时出现问题

Question

如何解决此错误。由于此视频上传需要太多时间。首先，我正在读一个细胞。然后创建从视频中提取的帧的直方图，然后将其与任何前一帧进行比较，并仅在直方图之间存在任何显着差异时上传。

global currRowIndex;
global histCell;

if (fname ~= 0)

file_fullpath = strcat(pthname, fname);
[pathstr, name, ext] = fileparts(file_fullpath);
 mov=VideoReader(file_fullpath);
 data = read(mov, Inf);
 nFrames=mov.NumberOfFrames;

parfor k = 1: nFrames       
     waitbar(k/nFrames);

    if(k==1)
        index=currRowIndex;
        cell=histCell;
        currentFrame = read(mov, k);
        imgHSV=rgb2hsv(currentFrame);
        H = imgHSV(:,:,1);
        S = imgHSV(:,:,2);
        V = imgHSV(:,:,3);
        hHist = hist(H(:),16);
        sHist = hist(S(:),16);
        vHist = hist(V(:),16);
        index=index+1;
        cell(index,:,:,:,index)={name;hHist;sHist;vHist;categorySelected};
    else
        currentFrame = read(mov, k);
        imgHSV=rgb2hsv(currentFrame);
        H = imgHSV(:,:,1);
        S = imgHSV(:,:,2);
        V = imgHSV(:,:,3);
        hHist = hist(H(:),16);
        sHist = hist(S(:),16);
        vHist = hist(V(:),16);
        [rowCurr,colCurr,depthCurr]=size(cell);
         found=0;
         if(row==0)
             row=1;
         end                 
         for x=row:rowCurr

          dbRow=cell(x,:,:,:,x);
           H_Temp= getDiff(dbRow{2},hHist);
          if(H_Temp>2000  && dbRow{5}==categorySelected)
              found=1;  
              break;
           end
         end
        if(found==1)
        index=index+1;
        cell(index,:,:,:,index)={name;hHist;sHist;vHist;categorySelected};
        end

    end
 end

我得到的错误如下

???引用已清除的可变单元格。

Error in ==> FrmUploadVideo>(parfor body) at 133
            [rowCurr,colCurr,depthCurr]=size(cell);