Hi Manuel,
thanks for your reply, your e-mails encouraging me.
I think that in first step this can be quick and more simpler solution.
At first i will try this scale down with VEISP scaler-divider (size divided
by 1, 2 and 4 factors) and then if this is done and if you can get me some
instructions i can write more flexible solution from your first proposal.
For me, the best solution would be standard VGA and QVGA resolutions. Okay,
i can crop image from 720x576 to 640x480 by software and than scale down
with VEISP divider if i need but this is rough solution with unnecessary
copying.
For simpler solution i suppose that i need to set MACC_ISP_SCALER_FACTOR as
you mentioned to 1, 2 or 4 but i am not sure what else should be done? This
registers are not described in detail.
This days i am locking in your PoC jpeg encoder as you mentioned before and
i hope that i will succeed to scale down source image by VEISP divider.
Best regards,
Milos
On Monday, October 24, 2016 at 7:38:56 PM UTC+2, Manuel Braga wrote:
>
> Hi.
>
> On Fri, 21 Oct 2016 03:19:46 -0700 (PDT) Milos Ladni
> <milosla...@gmail.com <javascript:>> wrote:
> > Hi everyone,
> >
> > Because there are PoC of hardware JPEG encoding and decoding, i am
> > now interesting of hw scaling..
> > Does does anyone tried to scale image (raw yuv 4:2:2 4:2:0 or rgb)
> > with A20 hardware?
> > How can i do this? I need scaler to scale image from one resolution
> > to another.
> > Concretely i read frame from tvin 720x576 4:2:0 and convert it to
> > jpeg with libjpegturbo, but i want to switch to hw scaler-encoder
>
> I forgot last time, there is another way from what was writing in the
> previous email, but is only better if what is need is only a scale down
> image at multiple of image sizes (size divided by 1, 2 and 4 factors)
>
> As said, the VEISP has a scaler that can use arbitrary scale factors
> (within a min/max), but doesn't need to use it, because when configured
> to (also) output raw pixels is possible to choose the outputted size.
> For your example of a source of 720x576, it can output (simultaneous
> when encoding) the sizes 720x576 or 360x288 or 180x144.
>
> If this isn't what you are looking or instead also wants to correct
> the aspect ratio to get square pixels, then the only option is to use
> the arbitrary scale factor scaler, as talked in the other email.
>
>
> > conversion now. The best solution would be
> > {[raw image] -> [scaler] -> [raw image]}
> > but alternative solution can be
> > {[raw image] -> [scaler -> encoder (jpeg-h264)] -> [compressed
> > image-stream]}
> > Can i use ISP as separated block or i need to use it as part of
> > jpeg-h264 encoder?
> > Can i utilize G2D for this purpose for example?
> > Does anyone tried anything similar with A20?
> >
>
> --
> Manuel Braga
>
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