Get percentage of amount filled from image

[Nando88]

I want to know if it is possible to get the percentage of how much a tank is filled with an image?

[Norbert_B]

What kind of image do you refer to?

You are aware that there is a "tank" control available in LV? Simply pass the percentage value to the tank and make sure it scales from 0 - 100.

Norbert

[Nando88]

What I wish to do is take an image from a tank, for example, and then obtain the percentage of how much of the tank is filled, just by using the picture taken from the tank as an input.

[Norbert_B]

That is a complete different task.

You can use IMAQ (Vision module) to analyze images. However, you have to create an application and "teach" it what you are looking for.

Biggest obstacles:

- Is the level of filling something you can clearly identify in the image? Is it the same for all levels?

- You want a %-age of filling: Tanks are not necessarily "linear". That means if the level of filling is at about 50% of the height of the tank, it still may fill 60% of the volume of the tank.

It would be easier to have some kind of filling level measurment in the tank directly. There are pretty good ones available for different environments (e.g. toxic, high temperature, ...) which usually work with capacity measurements.

Norbert

[Nando88]

Is there a way I could measure the height of the liquid and then divide that by the total height of the tank, that I would also need to measure with the image, and then multiply that by 100 to get the percentage?

[GerdW]

Hi Nando,

your calculation seems ok - as long as your tank has the same cross area for the whole height…

[Norbert_B]

Do you have example images you can post? this helps us to understand what you are facing....

Norbert

[Nando88]

Not right now. I will post the images as soon as I have them.