Raspistill: Some pictures are black










1















I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library










share|improve this question






















  • Is the only purpose of the thread to copy the pictures to other place?,

    – Cheche
    Nov 15 '18 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

    – Umar Dastgir
    Nov 15 '18 at 2:01











  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

    – Cheche
    Nov 15 '18 at 2:03











  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

    – Umar Dastgir
    Nov 15 '18 at 2:09











  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

    – Cheche
    Nov 15 '18 at 2:15















1















I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library










share|improve this question






















  • Is the only purpose of the thread to copy the pictures to other place?,

    – Cheche
    Nov 15 '18 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

    – Umar Dastgir
    Nov 15 '18 at 2:01











  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

    – Cheche
    Nov 15 '18 at 2:03











  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

    – Umar Dastgir
    Nov 15 '18 at 2:09











  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

    – Cheche
    Nov 15 '18 at 2:15













1












1








1








I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library










share|improve this question














I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library







python camera raspberry-pi raspistill






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asked Nov 15 '18 at 1:48









Umar DastgirUmar Dastgir

10511




10511












  • Is the only purpose of the thread to copy the pictures to other place?,

    – Cheche
    Nov 15 '18 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

    – Umar Dastgir
    Nov 15 '18 at 2:01











  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

    – Cheche
    Nov 15 '18 at 2:03











  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

    – Umar Dastgir
    Nov 15 '18 at 2:09











  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

    – Cheche
    Nov 15 '18 at 2:15

















  • Is the only purpose of the thread to copy the pictures to other place?,

    – Cheche
    Nov 15 '18 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

    – Umar Dastgir
    Nov 15 '18 at 2:01











  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

    – Cheche
    Nov 15 '18 at 2:03











  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

    – Umar Dastgir
    Nov 15 '18 at 2:09











  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

    – Cheche
    Nov 15 '18 at 2:15
















Is the only purpose of the thread to copy the pictures to other place?,

– Cheche
Nov 15 '18 at 2:00






Is the only purpose of the thread to copy the pictures to other place?,

– Cheche
Nov 15 '18 at 2:00














@Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

– Umar Dastgir
Nov 15 '18 at 2:01





@Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera

– Umar Dastgir
Nov 15 '18 at 2:01













Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

– Cheche
Nov 15 '18 at 2:03





Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...

– Cheche
Nov 15 '18 at 2:03













Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

– Umar Dastgir
Nov 15 '18 at 2:09





Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).

– Umar Dastgir
Nov 15 '18 at 2:09













Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

– Cheche
Nov 15 '18 at 2:15





Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.

– Cheche
Nov 15 '18 at 2:15












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