Ah cool! I didn't see that before. I have only recently started looking
into homographies, and most papers use SVD.
Good to know re. ME. I should stop trying to guess where bottlenecks are
likely to be without profiling :).
On Tue, Aug 7, 2018 at 12:33 AM Michael Niedermayer
wrote:
> On Mon,
On Mon, Aug 06, 2018 at 03:49:00PM +0100, Matthew Lai wrote:
> Sorry the matrices are actually 3x3, and most of the time will be spent on
> solving a 8x9 * 9x1 = 0 systems. And then all the feature points will have
> to be multiplied by the 9x1 matrix reshaped into 3x3.
>
> The math is here:
>
Sorry the matrices are actually 3x3, and most of the time will be spent on
solving a 8x9 * 9x1 = 0 systems. And then all the feature points will have
to be multiplied by the 9x1 matrix reshaped into 3x3.
The math is here:
On Fri, Aug 03, 2018 at 01:29:27PM +0100, Matthew Lai wrote:
> Hi Michael,
>
> The operations needed are multiplications, SVD, inversion, scaling, and
> additions, as far as I can tell. Convolutions would probably also be
> useful. They are certainly possible to implement directly, but it's
>
I just realized: OpenCV has functions to do all the homography hard work
already, so I'll probably use that since OpenCV is already a dependency.
On Fri, Aug 3, 2018 at 1:29 PM Matthew Lai wrote:
> Hi Michael,
>
> The operations needed are multiplications, SVD, inversion, scaling, and
>
Hi Michael,
The operations needed are multiplications, SVD, inversion, scaling, and
additions, as far as I can tell. Convolutions would probably also be
useful. They are certainly possible to implement directly, but it's
unlikely that any naive implementation will be within an order of magnitude
On Thu, Aug 02, 2018 at 05:24:08PM +0100, Matthew Lai wrote:
> Ah ok thanks! I'm surprised no one has need a linear algebra library. I
> guess there's OpenCV and people use it to do the heavy lifting?
>
> Will look into the API more.
alot ot linear algebra we needed has been implemented
Ah ok thanks! I'm surprised no one has need a linear algebra library. I
guess there's OpenCV and people use it to do the heavy lifting?
Will look into the API more.
Thanks
matthew
On Thu, Aug 2, 2018 at 3:31 PM Paul B Mahol wrote:
> On 8/2/18, Matthew Lai wrote:
> > Hello!
> >
> > I want to
On 8/2/18, Matthew Lai wrote:
> Hello!
>
> I want to write a more advanced video stabilizer for libavfilter (*),
> implementing the algorithm described here -
> https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/37744.pdf
> The focus of the paper is rolling shutter
Hello!
I want to write a more advanced video stabilizer for libavfilter (*),
implementing the algorithm described here -
https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/37744.pdf
The focus of the paper is rolling shutter removal, but it builds on top of
another
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