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, Au
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:
> htt
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:
https://www.uio.no/studier/emner/matnat/its/UNIK4690/v16/forelesninger/lectu
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
> unli
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
> addition
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
i
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 directly.
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 w
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 rem
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 algo
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