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When stackexchange or wikipedia articles appear on HN I always wonder what the context is. Presumably something triggered interest in this topic recently? In t

When stackexchange or wikipedia articles appear on HN I always wonder what the context is. Presumably something triggered interest in this topic recently? In this case image frequency can be useful in many things from image/video compression to hashing images (to efficiently compare if images are similar, even in the presence of cropping etc). So I'm curious as to what in particular motivated posting this now?

OldManAndTheCpp 7y ago
I think it's just interesting to a lot of the HN audience. A modal HN reader stumbled across the post, they found it interesting, they thought it would be good to post on HN, and it was. I think it's interesting to the modal HN viewer because although FFTs are pretty neat intrinsically, but most people are exposed to FFTs through sound processing (if they are exposed to Fourier Transforms at all, I don't think they were a required part of the CS curriculum at my university, they were only required for the EE courses), so the application of FFTs to images seems like total magic. The explanation that jpegs use FFTs is ho-hum if you spend a bunch of time doing signal processing at your day job, but there are many intellectually curious developers who spend their day job gluing together CRUD apps.
- arpa 7y ago
  If I recall correctly, frequency anomalies also show image doctoring, ala photoshop?
- ChrisSD 7y ago
  Oh undoubtedly it's interesting. But interesting things often go by with few votes. Often there's some reason it quickly gains the upvotes needed to appear of the front page. For example, if the topic is mentioned in another thread.
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thaumasiotes 7y ago
> When stackexchange or wikipedia articles appear on HN I always wonder what the context is. Presumably something triggered interest in this topic recently? A lot of the time it's because the link was relevant to a discussion in another thread, and someone pulled it out of that discussion to submit at the top level.

OldManAndTheCpp 7y ago

I think it's just interesting to a lot of the HN audience. A modal HN reader stumbled across the post, they found it interesting, they thought it would be good to post on HN, and it was. I think it's interesting to the modal HN viewer because although FFTs are pretty neat intrinsically, but most people are exposed to FFTs through sound processing (if they are exposed to Fourier Transforms at all, I don't think they were a required part of the CS curriculum at my university, they were only required for the EE courses), so the application of FFTs to images seems like total magic. The explanation that jpegs use FFTs is ho-hum if you spend a bunch of time doing signal processing at your day job, but there are many intellectually curious developers who spend their day job gluing together CRUD apps.

arpa 7y ago
If I recall correctly, frequency anomalies also show image doctoring, ala photoshop?
ChrisSD 7y ago
Oh undoubtedly it's interesting. But interesting things often go by with few votes. Often there's some reason it quickly gains the upvotes needed to appear of the front page. For example, if the topic is mentioned in another thread.
- deleted 7y ago
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thaumasiotes 7y ago

> When stackexchange or wikipedia articles appear on HN I always wonder what the context is. Presumably something triggered interest in this topic recently? A lot of the time it's because the link was relevant to a discussion in another thread, and someone pulled it out of that discussion to submit at the top level.