how to draw lines using given points in a video?

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vimal gayan 2019-5-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462673-how-to-draw-lines-using-given-points-in-a-video

评论： vimal gayan 2019-5-24

First,I give some points to starting posistion of the video,I need to draw lines through that points and get angles using x,y values,

Currently i able add points and get x,y values of those points while video playing.

videoFileReader = vision.VideoFileReader('ex.mp4');
videoPlayer = vision.VideoPlayer('Position',[1,10,1280,720]);
 objectFrame = videoFileReader();
objectRegion = [264,122,93,93];
figure; 
imshow(objectFrame);
[shoulder_X,shoulder_Y]= ginput(1);
[elbow_x,elbow_y]= ginput(1);
[wrist_x,wrist_y]= ginput(1);
pos   = [shoulder_X,shoulder_Y;elbow_x,elbow_y;wrist_x,wrist_y];
color = {'red','green','magenta'};
start_x = shoulder_X;
start_y=shoulder_Y;
disp(shoulder_X +" - "+shoulder_Y);
% imshow(pointImage);
points = detectMinEigenFeatures(rgb2gray(objectFrame));
pointImage1 = insertMarker(objectFrame,pos,'+','Color',color,'size',10);
 plot([shoulder_X,shoulder_Y], [elbow_x,elbow_y]);
plot([wrist_x,wrist_y], [elbow_x,elbow_y]);
figure;
imshow(pointImage1);
title('Detected interest points');
tracker = vision.PointTracker('MaxBidirectionalError',1);
initialize(tracker,pos,objectFrame);
while ~isDone(videoFileReader)
      frame = videoFileReader();
      [points,validity] = tracker(frame);
      out = insertMarker(frame,points(validity, :),'+');
      videoPlayer(out);
      disp(points);
  
end

As shown in above image,

Black circle: current status of my code,and these points move when video playing,

Red Circle:I need to improve red circle to this level.and these lines should move when video playing.

I try to draw lines using plot function but its not work.

 plot([shoulder_X,shoulder_Y], [elbow_x,elbow_y]);
plot([wrist_x,wrist_y], [elbow_x,elbow_y]);

2 个评论
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darova 2019-5-17

在 MATLAB Online 中打开

try

plot([shoulder_X elbow_x wrist_x shoulder_X], ...
     [shoulder_Y elbow_y wrist_y shoulder_Y])

vimal gayan 2019-5-17

not working :(

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采纳的回答

Mark Sherstan 2019-5-17

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462673-how-to-draw-lines-using-given-points-in-a-video#answer_375511

Use insertShape(). Cool project!

10 个评论
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vimal gayan 2019-5-22

编辑：vimal gayan 2019-5-22

在 MATLAB Online 中打开

yep,Now i am trying to get that values from the variable 'points'

In below code i display those variable values(x,y) using 'points'

I need to get those values to array and access those values seperately,How can i extract values from that?

this line - > disp(points); show all the x,y values of the movement.I need to get those values to the array.How can i do that?inside thise while loop.

tracker = vision.PointTracker('MaxBidirectionalError',1);
initialize(tracker,pos,objectFrame);
points = detectMinEigenFeatures(rgb2gray(objectFrame));
while ~isDone(videoFileReader)
      frame = videoFileReader(); 
      [points,validity] = tracker(frame);
      out = insertMarker(frame,points(validity, :),'+','size',10);
      out = insertShape(out,'Line',[shoulder_X shoulder_Y elbow_x elbow_y elbow_x elbow_y wrist_x wrist_y wrist_x wrist_y shoulder_X shoulder_Y] ); % Where position is for one or more disconnected lines, an M-by-4 matrix, where each four-element vector [x1, y1, x2,y2], describe a line with endpoints, [x1 y1] and [x2 y2].
      videoPlayer(out);
      disp(points);
end