In openCV, the inputFrame.rgba().size returns resolution of inputFrame or previewSize of the camera?

Android/Java
1

Can someone please confirm, in the openCV, the inputFrame.rgba().size() gives the resolution of the inputFrame or the previewSize of the camera?(https://github.com/touchlab-lab/OpenCVAndroidLib/blob/master/opencvandroidlib/src/main/java/org/opencv/android/CameraBridgeViewBase.java#L137)?

I could not find the exact documentation which points out that the rgba().size() returns the maximum resolution for the camera frames! Because in my code I am changing the previewSize of the cameraFrame and after testing that in my logs the inputFrame.rgba().size() was giving me the changed previewSize and not the resolution I have set using setMaxFrameSize()method(https://github.com/touchlab-lab/OpenCVAndroidLib/blob/master/opencvandroidlib/src/main/java/org/opencv/android/CameraBridgeViewBase.java#L277)

so, here my confusion is with rgba().size, as to why it was returning me the previewSize of the frame instead of giving me the resolution I have set using the setMaxFrameSize (which should be setting the frame size for OpenCV) and the rgba().size() in my logs was supposed to return that resolution I have set?

2

crosspost:

3

Thanks a lot for getting back, but, the link you have shared was posted by me in stack overflow seeking help, but I was not able to get the appropriate answer there, so looking to find any solution for the issue in the open CV forum here, can u please help me resolve this issue?

4

you might want to contact “touchlab”. they know their library. that doesn’t look like an OpenCV issue to me. I can be mistaken.

5

thanks, But Isn’t the cameraBridgeViewBase is officially part of Android OpenCV SDK code?(GitHub - opencv/opencv: Open Source Computer Vision Library)

6

you’re right.
but please rather refer to current opencv code than to a confusing 8 year old (!) fork of it

and also:

is this, what you’re seeing ?

[sidenote]: no android docs here

7

Thanks for getting back,

is this, what you’re seeing ?

yes I think thats what I was seeing, So the device I am using has a 1280x800 screen size and I think thats why it was taking the 1280x720 as the inputFrame resolution?

but when I tried to change the previewSize of the camera screen to something smaller like “720x480” the inputFrame.rgba().size() was giving me that previewSize where It was supposed to give the frameSize I have set using the setMaxFrameSize(3840,2160) (this setMaxFrameSize should give a resolution which is less than or equal to the value I have set I was hoping this could give a value higher than 1280x720 considering the capabilities of the camera of my device?)
More context:
My aim here was to achieve a higher resolution inputFrame as currently my code was giving me a 1280x720 but I have a device which can support higher resolutions as it is having a camera of 13MP.

8

Hi, @berak
I was blocked on this since a long time!, can you please suggest how I should approach in this case here?