calculating volume from an image

[Omar-Abdelhameed]

Thanks altenbach for the clarification, I thought to do that I would need IMAQ tool ! Can you please assist in detecting these variables? 

[altenbach]

You have 2D array data that you can slice and dice as shown and do some simple signal processing.

A picture indicator can show the picture and there are plenty of tools to detect mouse interaction and draw decorations (lines, circles, text, etc.) in any color. No IMAQ needed.

As a first step you need to define the scenario bounds.

• Is the sight glass always fully visible or can parts be cut off?
• Is the magnification always the same?
• Is the picture always greyscale or can it be color?
• Is is always exactly vertical or can it be tilted?
• Does it always have the same number of markers over its length?
• Is the liquid always darker than the space above it?
• How fast does the level change?
• What is the required precision?
• etc.

[altenbach]

For example just doing the average brightness of each row shows the pattern of major and minor tick marks, the zero line, the sight glass limits, and the level. A simple 1D feature detection can get all required information. Try it!

[Omar-Abdelhameed]

Thank you really appreciated. I will try it. 

[Omar-Abdelhameed]

I think the pixel at zero line could be found using the same code and then the rest of the calculations to be done. 

[altenbach]

The zero line is the only one that is present on the left half of the object and is the only real sharp feature, you could apply a filter on that column data and see which point changes the most, for example.

[Omar-Abdelhameed]

Thank you albentach I am trying to do that, and also I want to understand how to get the therhold Y and how I can calculate it? 

[Omar-Abdelhameed]

Using this vi resulting 800 which somehow close to 797 that could be detected visually.