LabVIEW
calculating volume from an image
Solved!
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.
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!
I think the pixel at zero line could be found using the same code and then the rest of the calculations to be done.
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.
Hello altenbach, I have a question am trying to solve but struggling to solve it. how to change the code if the image I am selecting is in different orientation similar to the attached picture?
I got that solved. please see attached picture. The issue I am facing now is when the position of the opject changes, the vi wrongly calculates number of lines!! is there are way to fix that?
I appreciate your help and support. Thank you.
