Image and video process

Hi all,

I am trying to find the speed of one liquid moving above another liquid (oil and water). However, I came with this code shown down by picking up a single row of 1600*2560 and then find the gradient, then find the max gradient ( doing that is to track the edge of oil slick though the video.

By doing that, I plot time VS positions but this plot has a lot of up and down peaks with big variations, what I am trying is to make my code fix these huge differencing without effecting the original trend and be able to extract the plot number to find the speed using a central or forward differencing equation. I did use "smooth data" command but it has a negative effect on the trend of the plot (the plot is attached for your reference).

However, maybe I use a complicated method if there is an alternative method for finding the speed of moving oil on the water surface please share it with me.

X-axis : time

Y-axis: position of the max gradient in different frame

Blue line (smooth data command)

orange line is the original

path2Video = 'C:\files\Herder\June 14/concave.avi';

video = VideoReader(path2Video);

frames = read(video,[1970 3500]);

[w,h,c,totalFrames] = size(frames);

for i=1:totalFrames %cycle through number of frames

A = frames(:,:,1,i);%A=load( ) %load image from first time

B=(A(963,155:2060)); %extract single row of pixel values; remember that row values count from the top of the image

FX=gradient(double(B));

[M,xlocation] = max(FX);

xlocations(i)=xlocation;

end

%time=[30:1]; %however many frames you have0

%x = [0:totalFrames*0.0333];

x = [1:totalFrames];

x = x * 0.033333;

xlocations1 = smoothdata(xlocations)%,'movmean','SmoothingFactor',0.6);

plot(x,xlocations1,x,xlocations) %gives plot of location over time

[Image Analyst]

Can you attach 'C:\files\Herder\June 14/concave.avi' in a .zip file?

[Ali alshamrani]

the problem is that the size of the video is huge even with zip file. However, I compressed the video and uploaded it in google drive, see if you can open it.

https://drive.google.com/file/d/1SLlfccaHzxDxKRKnovobWzp2fGrJY9vl/view?usp=sharing

[Madhav Thakker]

The file is private and not accessible.

[Image Analyst]

If it's small enough, attach it here with the paper clip icon.

[Ali alshamrani]

I hope now you can see it. I did cutting as well as compressing to the oeiginal video.

Please let me know if you have problem openning the file.