💭 Use Vision Camera as Light Meter about react-native-vision-camera HOT 4 OPEN

Hey - yea currently that is not something VisionCamera offers. This also shouldn't go into Frame Processors, as the purpose of Frame Processors is to really do some processing based on Frame pixel data, not camera live data, so here's your two options:

1. Manually analyze the Frame with some ML algorithms to find out how bright the pixels in the Frame are (this would work today, but might be slow and wouldn't give very precise results about EV, ISO etc)
2. Pay me to build that into VisionCamera - I can easily add callbacks for such things, e.g. onExposureChanged, onISOChanged, etc. as such things change over the runtime of the Camera, and I don't think they change so quick that we need a 60 FPS frame processor for them - I think Callbacks with new data every second or so are fine.

@mrousavy I just PM you via your email. Thanks.

from react-native-vision-camera.

Is that information in the format or device object? If that's the case you can pass an extra object in each frame processor plugin call (the second param)

from react-native-vision-camera.

AFAIK you can't have info like current ISO, WB point in preview, as frame processors work with preview images in almost real time. Also there's no shutter for preview frames.

What you probably need is take a photo with vision camera and somehow get all those params you need from the photo's metadata. Then you can read the photo from cache file or camera roll and get pixel values.

from react-native-vision-camera.

Hey - yea currently that is not something VisionCamera offers.
This also shouldn't go into Frame Processors, as the purpose of Frame Processors is to really do some processing based on Frame pixel data, not camera live data, so here's your two options:

1. Manually analyze the Frame with some ML algorithms to find out how bright the pixels in the Frame are (this would work today, but might be slow and wouldn't give very precise results about EV, ISO etc)
2. Pay me to build that into VisionCamera - I can easily add callbacks for such things, e.g. onExposureChanged, onISOChanged, etc. as such things change over the runtime of the Camera, and I don't think they change so quick that we need a 60 FPS frame processor for them - I think Callbacks with new data every second or so are fine.

from react-native-vision-camera.