Hi every one can you help me please

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Sh Ahmadi 2019-6-3

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回答： Sh Ahmadi 2019-6-3

I have two images, they are related two images of running water at two differnet times(T1 and T2) . To find the velocity I tagged the some portion of flow , so this tag is moving by the time , if I comper these images I can see the position of tag has changed , everywhere that I have tag in matrix I have less intensity . At time T1 tag has has rectangular shape but after time T it has not uniform shape. My question : how I can analysis these two matrix to fnd information related to displacement and velocity ?

Thanks advance

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Answer 1

KSSV 2019-6-3

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How about the below approach:

Divide both the images into a grid (meshgrid, boxes of uniform length and width)
In each image see does water enter into each box.
Pick the boxes at which water entered.
Let the midpoint of the box be the position of water particle at that instance of time.

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Sh Ahmadi 2019-6-3

Thanks for your reply , actually water is runing insid the tube , these images showing that the tag is moving by the time, intensity is changing betwen two images. my question is how two analysis these two image and thier matrix.

thanks

KSSV 2019-6-3

Attach the images......It can be done like what I said.

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Answer 2

Sh Ahmadi 2019-6-3

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Here I have ataches images and matrix .

Thanks

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KSSV 2019-6-3

Sh Ahmadi commented: MRI imaging, I should find the velocity of flow by tracking this tag. I know what is time interval between two image , I need to know what is displacement of tag.