Tootfinder

Reconstruction Bias in Timepix4 Subpixel Centroiding for Electron Imaging
Nina Dimova, Richard Plackett, Daniela Bortoletto
https://arxiv.org/abs/2608.21072 https://arxiv.org/pdf/2608.21072 https://arxiv.org/html/2608.21072
arXiv:2608.21072v1 Announce Type: new
Abstract: Subpixel centroiding is widely used to improve the spatial resolution of hybrid pixel detectors for electron imaging by estimating the true interaction position within an entry pixel. Existing centroiding strategies are typically optimised using localisation accuracy. However, observations show that improved localisation does not necessarily translate into improved modulation transfer function (MTF) or reliable virtual-pixel rebinning. This work proposes a unified interpretation of these observations based on the ambiguity of the centroid reconstruction problem. We show that observable-based centroid estimators solve an intrinsically non-unique inverse problem using deterministic reconstruction rules, which can introduce entry-phase-dependent reconstruction bias that governs the spatial distribution of reconstructed subpixel coordinates. This framework explains why localisation accuracy alone is insufficient to predict imaging performance and identifies approximate intra-pixel translational symmetry as a prerequisite for faithful virtual-pixel imaging. The proposed interpretation is evaluated using simulated 200 keV and 300 keV electron data together with measured 200 keV data acquired with a Timepix4 detector. Comparisons of charge-weighted, timing-based, and morphology-dependent centroiding strategies demonstrate that estimators with similar localisation performance can exhibit markedly different MTFs and rebinned flat-field behaviour. The results suggest that future centroid optimisation should consider subpixel phase bias and rebinnability alongside localisation accuracy.
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In an interview, Tim Cook says Apple price hikes are "unavoidable" to offset surging memory and storage chip costs, and "the situation has become unsustainable" (Rolfe Winkler/Wall Street Journal)
https://www.wsj.com/tech/apple-price…

The most depressing news of the week, and this decade so far, is the UN's report that leaves no doubt that we will fail to hold global warming below 1.5ºC. But there is also hope, read on.
The world agreed in 2015 on 1.5ºC, championed, I might add, by a certain Canadian Prime Minister. Now, the best we could hold it to would be 1.8ºC and that would be at breakneck speed.
That Prime Minister is now hanging out with his kids, his girlfriend, and is generally getting on just fine...while his party oversees what they intend to be the greatest expansion of fossil fuel infrastructure and emissions (LNG and TMX2) in Canadian history.
Meanwhile the rest of us are left breathing in the smoke and fleeing the fires.
As a young adult 25 years ago, I thought we had time. I was optimistic. I thought surely we'd make the correction once the every-day consequences started to hit.
Well here we are, fully in the *beginning* of those consequences, and our governments have never been more committed to being the last one to sell the last drop of oil, coal, or gas.
No one disputes anymore that we have and are changing the climate.
The deniers lost.
But the oil companies are still winning.
The only way to save ourselves at this time and to have any hope of 1.8ºC or 2ºC or whatever the lowest possible temperature is that we can achieve, is to take the fight to the oil companies directly.
Physically.
Economically.
Until they cannot operate, pollute or continue as going concerns.
We are all of us feeling the impacts of climate change and what oil companies have done. That means today we have many many more people ready to fight than we ever have before.
We have to fight because they are already killing us, and because the rest of us must survive.
We will fight because if we don't, both they, and we, will die on a planet rendered unliveable by our own stupidity and greed.
So we fight. In every way you can. You fight.
#CanPoli #CdnPoli #ClimateEmergency #EndFossilFuels #TransitionNow