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christianh

8 karma · joined July 27, 2013

Software developer, M.Sc. Applied Physics.

https://cobalt.io https://poser.pro

x.com: @ChrHansen

LinkedIn: linkedin.com/in/christianhansen/

submissionscomments
christianh··on Lift4D: Harmonizing Single-View 3D Estimation for 4D Reconstruction In-the-Wild
Looks cool. How’s it different from https://github.com/gaomingqi/sam-body4d ? My guess: Is sam-body4d focused on temporally consistent body reconstruction into an MHR model, and Lift4D creates the full scene and a model of the tracked object (that doesn’t need to be a human). I may be way off, but a comparison would help me!
christianh··on Ask HN: What are you working on? (June 2026)
I continue to work on Poser, an AI video analysis tool for skiers. Upload a ski video clip, get feedback. Detecting the pose was difficult, now I need to actually give the feedback which is a lot harder.

https://poser.pro.

christianh··on Ask HN: What are you working on? (May 2026)
I’m building an AI Ski coach. Upload a video clip of your skiing, get feedback: https://poser.pro

I’d love any feedback!

It’s a lot of fun and ultimate nerdery for me :) I’m a ski instructor through the Austrian and Danish ski school systems, I studied physics, and I’ve been a developer the last 15 years.

christianh··on Ask HN: What Are You Working On? (April 2026)
I’m working on https://poser.pro, a ski technique feedback tool for skiers that want to improve their skills.

How? The user (skier!) uploads a short ski clip to Poser, lets Poser analyze, and then gets their results.

For now, you get video outputs: head-tracking and skeleton overlay. I’ve built a a lot of extra stuff (animated 3D body, turn-detection, balance-, steering-, pressure-, and edging-metrics, etc.), I’m just not sure how to package it all to be useful. So as of this post, videos are what’s available.

I’m using Meta AI’s SAM3 Tracking and SAM3D Body for skier tracking and pose estimation. The heavy lifting happens in Runpod.

I’m a software developer, Bachelor and Masters in Applied Phyiscs, and a ski instructor in the Austrian and Danish ski schools. So I thought to combine all three passions in Poser!

christianh··on Amazon reveals first color Kindle, new Kindle Scribe, and more
I’ve been wanting to have a color ereader for a while (e.g. when non-fiction books have charts, illustrations, and photos I want to see them as they appear in print) and I’ve been looking at Kobo and others. But I want access to buy books on Amazon easily.

It’s my understanding that you can’t easily get Amazon books onto anything else than Kindle, is that not true?

christianh··on Ask HN: Who is hiring? (June 2016)
Cobalt.io | San Francisco, CA | Lead Developer | https://cobalt.io | Onsite | Visa

Cobalt connects security researchers with modern companies who need their applications security tested. We're a small team with our platform built in Ruby on Rails – you'll have a lot of ownership, responsibility, and chances to learn. We'll do a quick video call, invite you onsite, you'll do a take-home task, we'll discuss the task together, then we decide.

Full stack Rails Developer: https://angel.co/cobalt-io/jobs/22885-full-stack-ruby-on-rai...

christianh··on I found Prezi's source code
A simple option is CrowdCurity - reward programs as a service. Private or public, dollars or bitcoin payments - everything setup and managed for the companies.

https://www.crowdcurity.com/

Disclosure: I'm co-founder of CrowdCurity

christianh··on “NASDAQ is owned.” Five men charged in largest financial hack ever
Well maybe there's some light at the end of the tunnel: If hackers had an easier way to gain recognition and being rewarded when they discover vulnerabilities, I'm certain most would choose to disclose their findings rather than try selling them on the black market. I'm working on a startup right now, www.crowdcurity.com, where we want to let any site easily create a bug bounty program (similar to Google, Mozilla, Paypal, etc.) and thereby leverage testers around the world to find vulnerabilities; hopefully initiatives like this will strengthen the security of web apps and websites around the world.