How to use the Y value

Community Help
1

Using the Roboflowoak module, how does one extract the y value from the predictions and use it in the Python script? An example of this syntax would be helpful, thanks!

I found that the Oak camera works more reliably when supplied with power via the barrel plug. The Raspberry Pi must not always supply enough via USB.

2

Hi, within the comments of the script, the y-value in predictions is accessible by: using [p.json()['y'] for p in predictions] after predictions is set to results[‘predictions’] within the while-loop.

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  • Example (extracting the y-value):
print("PREDICTIONS ", [p.json()['y'] for p in predictions])

The y-value can also be found in this print statement within the code: print("PREDICTIONS ", [p.json() for p in predictions])

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3

So this simple line will do it?

aim = predictions[y]

The value will be assigned to “aim”?

Thanks

4

ted@raspberrypi:~ $ python3 /home/ted/Herbie_Bot/Herbie_ai2.py
/home/ted/Herbie_Bot/Herbie_ai2.py:14: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.
GPIO.setup(17, GPIO.OUT)
/home/ted/.local/lib/python3.9/site-packages/roboflowoak/pipe.py:105: RuntimeWarning: divide by zero encountered in true_divide
return 441.25 * 7.5 / disparity
Traceback (most recent call last):
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[1] in predictions]
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[1] in predictions]
NameError: name ‘p’ is not defined

ted@raspberrypi:~ $ python3 /home/ted/Herbie_Bot/Herbie_ai2.py
/home/ted/Herbie_Bot/Herbie_ai2.py:14: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.
GPIO.setup(17, GPIO.OUT)
/home/ted/.local/lib/python3.9/site-packages/roboflowoak/pipe.py:105: RuntimeWarning: divide by zero encountered in true_divide
return 441.25 * 7.5 / disparity
Traceback (most recent call last):
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = ([p.json() for p[1] in predictions])
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = ([p.json() for p[1] in predictions])
NameError: name ‘p’ is not defined

ted@raspberrypi:~ $ python3 /home/ted/Herbie_Bot/Herbie_ai2.py
/home/ted/Herbie_Bot/Herbie_ai2.py:14: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.
GPIO.setup(17, GPIO.OUT)
/home/ted/.local/lib/python3.9/site-packages/roboflowoak/pipe.py:105: RuntimeWarning: divide by zero encountered in true_divide
return 441.25 * 7.5 / disparity
Traceback (most recent call last):
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[y] in predictions]
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[y] in predictions]
NameError: name ‘p’ is not defined

ted@raspberrypi:~ $ python3 /home/ted/Herbie_Bot/Herbie_ai2.py
/home/ted/Herbie_Bot/Herbie_ai2.py:14: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.
GPIO.setup(17, GPIO.OUT)
/home/ted/.local/lib/python3.9/site-packages/roboflowoak/pipe.py:105: RuntimeWarning: divide by zero encountered in true_divide
return 441.25 * 7.5 / disparity
Traceback (most recent call last):
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[‘y’] in predictions]
File “/home/ted/Herbie_Bot/Herbie_ai2.py”, line 54, in
aim = [p.json() for p[‘y’] in predictions]
NameError: name ‘p’ is not defined

5

This would extract and print the y-value (edited my original comment, I mis-typed):

print("PREDICTIONS ", [p.json()['y'] for p in predictions])