Velocity of the Dye?

2 次查看（过去 30 天）
muhammad choudhry
评论： Image Analyst 2023-11-14
Hi,
I have attached 2 consecutive frame of the process where it showing the spread of dye in water. I would like to find the velocity of the dye. If any of you guys can give some suggestions how to go ahead with this. Will this be possible to count the pixels in the dye area if yes how?
  2 个评论
darova
darova 2020-6-14
Can you make a simple sketch or something? What are trying to calculate?
muhammad choudhry
muhammad choudhry 2020-6-29
编辑：muhammad choudhry 2020-6-29
Hi, I am injecting the dye into a swirling machine at the inlet to calculate the velocity of the dye . FPS of the camera is 30 frames per second. I want to calculate the velocity of the dye spread. Initially, I want to see the interface of the dye and water too track the spread of dye and count the pixels in the interface frame by frame. Is there a way or code to find out the velocity of the dye spread at the interface?
So far, I tried to subtract the background of the frame and contour the dye but seems like I am getting other back ground disturbance hence plan is to extract the contour of the 10 to 20 frames and track the movement of them.
But I do not know how in code?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2020-6-14
Try the color thresholder on the Apps tab of the tool ribbon.
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2020-6-29
I assume you want the red region, right? That's what the color thresholder will get for you.
muhammad choudhry
muhammad choudhry 2020-6-29
编辑：muhammad choudhry 2020-6-29
color thresholder app gives the option of RGB,LAB etc. I selected RGB hence then it ask to select the region of interest i drew the freehand mask around the red dye then it gave me the results in the RGB histogram that's not I am looking for.
I am looking a method => Something which will just extract the dye from the whole process then take the contour of the dye only => once have the contour lets say 10 frames I want build the code which will detect and track the movement or spread of dye contour hence give me the velocity of the process (how fast dye interface spreading).
Can you help building this code?
I have attached you 7 raw images as well.

请先登录，再进行评论。

更多回答（1 个）

Anay
Anay 2023-11-14
Hello, were you able to get the code for this function? I was also looking for something similer. If you have the code can you please provide it to me?
Thanks
  1 个评论
Image Analyst
Image Analyst 2023-11-14
@Anay Since my answer was accepted, I assume that they took my advice and used the Color Thresholder app and had that export the code as a function.
If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:
TUTORIAL: How to ask a question (on Answers) and get a fast answer

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by