调整光流的帧大小

Question

如果以任何方式操纵帧大小，我就会遇到光流问题，这会给我带来错误。有两个选项要么在开始时更改视频的分辨率，要么以某种方式更改帧大小以使光流起作用。我想在进一步开发中添加一个级联对象来检测鼻子、嘴巴和眼睛，因此我需要适用于各个区域的解决方案，而无需为这些区域单独设置光流，尤其是边界框没有固定大小并且它会从一帧到另一帧略微移动。到目前为止，这是我的代码，错误是它超出了矩阵尺寸。

faceDetector = vision.CascadeObjectDetector();

vidObj = vision.VideoFileReader('MEXTest.mp4','ImageColorSpace','Intensity','VideoOutputDataType','uint8');
converter = vision.ImageDataTypeConverter;
opticalFlow = vision.OpticalFlow('ReferenceFrameDelay', 1);
opticalFlow.OutputValue = 'Horizontal and vertical components in complex form';
shapeInserter = vision.ShapeInserter('Shape','Lines','BorderColor','Custom','CustomBorderColor', 255);
vidPlayer = vision.VideoPlayer('Name','Motion Vector');

while ~isDone(vidObj);
    frame = step(vidObj);
    fraRes = imresize(frame,0.5);
    fbbox = step(faceDetector,fraRes);

    I = imcrop(fraRes,fbbox); 

    im = step(converter,I);
    of = step(opticalFlow,im);
    lines = videooptflowlines(of, 20);
    if ~isempty(lines)
        out = step(shapeInserter,im,lines);
        step(vidPlayer,out);
    end
end
release(vidPlayer);
release(VidObj);

Answer 1

更新：我去编辑了创建线条的光流函数，这解决了一些尺寸问题，但是有必要为每个对象手动输入这个（所以如果有任何其他方式让我知道）。我认为最好的解决方案是将固定大小设置为 cascadeObjectDetector，有人知道该怎么做吗？还是有其他想法？

faceDetector = vision.CascadeObjectDetector(); %I need fixed size for this
faceDetector.MinSize = [150 150];

vidRead = vision.VideoFileReader('MEXTest.mp4','ImageColorSpace','Intensity','VideoOutputDataType','uint8');
convert = vision.ImageDataTypeConverter; 
optFlo = vision.OpticalFlow('ReferenceFrameDelay', 1);
optFlo.OutputValue = 'Horizontal and vertical components in complex form';
shapeInserter = vision.ShapeInserter('Shape','Lines','BorderColor','Custom',  'CustomBorderColor', 255);

while ~isDone(vidRead)
    frame = step(vidRead);
    fraRes = imresize(frame,0.3);
    fraSin = im2single(fraRes);

    bbox = step(faceDetector,fraSin);

    I = imcrop(fraSin, bbox); 

    im = step(convert, I); 
    release(optFlo);
    of = step(optFlo, im);
    lines = optfloo(of, 50); %use videooptflowlines instead of (optfloo)
    out =  step(shapeInserter, im, lines); 
    imshow(out);
end