CODEWITHSUNDEEP
pythonopencvif-statement
Andrew Pham
Andrew Pham

Reputation: 21

How to check if eyes are not detected for x amount of time

I am currently writing a program that uses openCV with a haar cascade for eyes. I need it to run some code if eyes are not detected for a few seconds, and I can't figure out how to use the time library to check the time. Here is an example of something I have tried.

if len(eyes) == 0:
    if noEyeTime - startTime > 2:
        print("closed for more than 2 seconds")
        time.sleep(2)
        startTime = time.time()
    noEyeTime = time.time()
# The variables are declared outside of the while loop

This is the check that I've written (it's inside a while True loop), and I've tried moving around the variable updates but I can't figure out how to check if eyes have not been detected for x amount of time.

I also read this post: Python if condition true for x amount of time

But the solution doesn't work for me because the program still needs to be running, so time.sleep() is not an option.

Thanks in advance.

Upvotes: 0

Views: 229

Answers (2)

Andrew Pham
Andrew Pham

Reputation: 21

Thanks to Ritesh's idea, I moved the startTime to where the eyes are detected, and then compared that to the current time when the eyes are not detected. The code looks like this:

# Writes to log file when eyes are detected
if anterior != len(eyes):
    anterior = len(eyes) 
    log.info("faces: "+str(len(eyes))+" at "+str(dt.datetime.now()))
    startTime = time.time()

if len(eyes) == 0:
    elapsedTime = endingTime - startTime
    if elapsedTime > 2:
        print("eyes closed for 2 seconds")
    endingTime = time.time()

Upvotes: 1

Ritesh Khanna
Ritesh Khanna

Reputation: 146

you can have a time track by creating an starting_noEye=time.time() before starting eye no eye detection and an ending_noEye=time.time() at the end of the no eye detection part of code. The noEyeTime can be assigned to differenence of those :- noEyeTime=ending_noEye-starting_noEye. This will give you the amount of time when eyes were not detected.

Upvotes: 1

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