Matlab与复数计算

Question

我目前正在用matlab编写一个代码来分析心脏中的光流，由于某种原因，每当我运行它时，它都会返回奇怪的复杂函数。我不确定它们是从哪里来的，我希望能得到一些帮助来弄清楚这一点。

function [opticalFlow] = opticalflowanalysis(handles,hOpticalflow)

videoReader = vision.VideoFileReader('jun07_0165_segment8to12_20.avi','ImageColorSpace','Intensity','VideoOutputDataType','single');
converter = vision.ImageDataTypeConverter; 
opticalFlow = vision.OpticalFlow('OutputValue', 'Horizontal and vertical components in complex form','ReferenceFrameDelay', 6);
shapeInserter = vision.ShapeInserter('Shape','Lines','BorderColor','Custom', 'CustomBorderColor', 255);
videoPlayer = vision.VideoPlayer('Name','Motion Vector');
%Convert the image to single precision, then compute optical flow for the video. Generate coordinate points and draw lines to indicate flow. 

i=0;
mm = ones(1080,1920);
%Display results.      
while ~isDone(videoReader)
    frame = step(videoReader);
    im = step(converter, frame);
    of = step(opticalFlow, im); %always complex number
    aa = size(of)
    lines = videooptflowlines(of, 5); %complex number only sometimes - when lines appear?
    bb = size(lines)
    x = i+ 1;
    if(x==2)
        mm = of;
    end
    % show diff bw of and lines matrices
    if (x == 2)||(x == 10)
        for j=1:1:1080 %gives j = [1 2 ... 720]
            for k=1:1:1920 %gives k = [1 2 ... 1280]
                of(j,k)
                lines(j,k)
                if(of(j,k) ~= lines(j,k))
                    disp(['of[',num2str(j),',',num2str(k),'] = ', num2str(of(j,k)), '...', 'lines[',num2str(j),',',num2str(k),'] = ', num2str(lines(j,k))])
                end
            end
        end
    end
    if ~isempty(lines)
      out =  step(shapeInserter, im, lines); 
      step(videoPlayer, out);
    end
end
%Close the video reader and player ,
%handles.output = hObject;
release(videoPlayer);
release(videoReader);

mm

它返回：

aa =

        1080        1920


bb =

       36465           4

bb中的变量从何而来？

谢谢，雅各布

Answer 1

尝试将分号(即;)放在指定了aa和bb的行的末尾

aa = size(of);
...
bb = size(lines);

看看会发生什么。

请注意，由于aa和bb似乎都没有在程序的后面使用，您可能可以安全地删除这两行。