OpenCV capture

OpenCV capture

[Gary Thomas]

I'd like to use OpenCV with my i.MX6 system to capture and
process data directly from the camera(s) I have connected
to the CPU.  Sadly, these cameras (CCS, MIPI) produce I420
data but the OpenCV capture code can only work with GBR24.

Is there a way to make this conversion happen, perhaps using
the VPU/IPU (I'm not sure which)?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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Re: OpenCV capture

[Carlos Rafael Giani]

On 07/14/2015 04:13 PM, Gary Thomas wrote:
> I'd like to use OpenCV with my i.MX6 system to capture and
> process data directly from the camera(s) I have connected
> to the CPU.  Sadly, these cameras (CCS, MIPI) produce I420
> data but the OpenCV capture code can only work with GBR24.
>
> Is there a way to make this conversion happen, perhaps using
> the VPU/IPU (I'm not sure which)?
>

I420 -> RGB/BGR should be doable with IPU and G2D. I recommend using 
G2D, since it is much more straightforward to use. GBR is not supported, 
but could you swap G and B inside OpenCV?

Re: OpenCV capture

[Gary Thomas]

On 2015-07-14 08:33, Carlos Rafael Giani wrote:
> On 07/14/2015 04:13 PM, Gary Thomas wrote:
>> I'd like to use OpenCV with my i.MX6 system to capture and
>> process data directly from the camera(s) I have connected
>> to the CPU.  Sadly, these cameras (CCS, MIPI) produce I420
>> data but the OpenCV capture code can only work with GBR24.
>>
>> Is there a way to make this conversion happen, perhaps using
>> the VPU/IPU (I'm not sure which)?
>>
>
> I420 -> RGB/BGR should be doable with IPU and G2D. I recommend using G2D, since it is much more straightforward to use. GBR is not supported, but could you swap G and B inside OpenCV?

Perhaps.  How would I set things up to do this conversion
in the IPU/G2D?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: OpenCV capture

[Carlos Rafael Giani]

On 07/14/2015 04:51 PM, Gary Thomas wrote:
> On 2015-07-14 08:33, Carlos Rafael Giani wrote:
>> On 07/14/2015 04:13 PM, Gary Thomas wrote:
>>> I'd like to use OpenCV with my i.MX6 system to capture and
>>> process data directly from the camera(s) I have connected
>>> to the CPU.  Sadly, these cameras (CCS, MIPI) produce I420
>>> data but the OpenCV capture code can only work with GBR24.
>>>
>>> Is there a way to make this conversion happen, perhaps using
>>> the VPU/IPU (I'm not sure which)?
>>>
>>
>> I420 -> RGB/BGR should be doable with IPU and G2D. I recommend using 
>> G2D, since it is much more straightforward to use. GBR is not 
>> supported, but could you swap G and B inside OpenCV?
>
> Perhaps.  How would I set things up to do this conversion
> in the IPU/G2D?
>

If you are using GStreamer, gstreamer-imx has imxipuvideotransform and 
imxg2dvideotransform elements that can do this.
You can also look at their source code.

Re: OpenCV capture

[Alfonso Tamés]

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Hi Gary,

Have you seen this guide for OpenCV and i.MX6?

http://imxcv.blogspot.mx/2014/02/building-opencv-24x-for-freescales-imx6.html <http://imxcv.blogspot.mx/2014/02/building-opencv-24x-for-freescales-imx6.html>

Regards,

Alfonso

>> 
>> I420 -> RGB/BGR should be doable with IPU and G2D. I recommend using G2D, since it is much more straightforward to use. GBR is not supported, but could you swap G and B inside OpenCV?
> 
> Perhaps.  How would I set things up to do this conversion
> in the IPU/G2D?
> 


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