compare two jpeg taken by ip camera

Hi people,

I have an IP camera and I need to take two pictures and compare them, and then my program must return if there is something different about the image. Taking pictures is not a problem, using an activex with the library of camera control I can use a function that writes a JPEG disc. The real problem is to compare these images. I tried to hide them, but given that the sensor is a CMOS, there is a lot of noise, and even if I take two pictures without moving anything, when I subtracted the pictures it's not not empty (black). Then I tried to use Vision Assistent or the gold model, but I could not use them because of two problems:

-first of all, most of the functions on Vision Assistent can only deal with 8-bit binary images. Does anyone knows how to convert a JPEG in this format?

-Second, when I tried to open images to use the functions of the IMAQ on my own vi, I used the image.ctl IMAQ and typed the path to images and linked to service them, but whenever I run thid kind of VI, it returns an error indicating that the file is not an image.

If you know how to solve one of these questions, or if you think of another method to compare the jpeg, please let me know!

Kind regards

Vitor

Hello. Here is the solution. Simply define a level of similarity (for example 1%) and use this VI. Take care.

Tags: NI Software

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