Thanks fo replying. I have set the exposure right after the streaming starts and just before every picture is taken using
error = deviceController->aRDrone3->sendPictureSettingsSaturationSelection(deviceController->aRDrone3, -2.7);
But still the exposure time (1/100s to 1/150s) and ISO value changes (ISO 800 to ISO1600) for the Images even though i set up same exposure before each image.
I want to know whether I can keep ISO and exposure time constant for the image taken in various conditions or there is some internal auto adjustment which may be changing according to the scene lighting and hence changes the ISO and exposure time values. If there is auto adjustment than can i turn it off or not?