convert a Mat type to be a type of frame Mat

asked 2016-09-04 04:43:27 -0600

elish
41 ●2 ●7

Hi,

I am working on an augmented reality app in android,
In "onCameraFrame" i am trying to overlay a small Mat which is an image that was converted from bitmap, onto frame Mat that will be returned to camera preview, i am using submat to do it.
The problem is that the 2 Mat objects need to be the same type and i can not get the way to do it.

when i print the type of the small mat -

ImageMat.type()

i get 24.
when i print the frame Mat -

rgba.type()

i get 16.
How can i make the first one also 16 ?

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can it be, you got the numbers switched ? (if rgba is, what it says, it should have type()==24)

berak ( 2016-09-04 05:23:12 -0600 )edit

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answered 2016-09-04 05:04:28 -0600

berak
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24 == CV_8UC4, 16 == CV_8UC3.

so, to convert ImageMat to the format of rgba (misnomer?) you would use:

Mat dst = new Mat();
Imgproc.cvtColor( ImageMat, dst, Imgproc.COLOR_BGRA2BGR );

or, into the other direction:

Imgproc.cvtColor( rgba, dst, Imgproc.COLOR_BGR2BGRA );

also see docs, and remember, that opencv's Mat''s are in BGR order, while native android has it RGB(A)

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@berak Thank you very much!! it worked!!

elish ( 2016-09-04 05:33:43 -0600 )edit

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Asked: 2016-09-04 04:43:27 -0600

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Last updated: Sep 04 '16

convert a Mat type to be a type of frame Mat edit

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