Parellagram – Dynamic Image Resizing with Go | Hacker News Reader

Parellagram – Dynamic Image Resizing with Go

parellagram.com

68 pointschewxy16 comments

Cached: http://webcache.googleusercontent.com/search?q=cache:http://...

The video at the end is neat to watch, and after that video, there was another that showed "Improved Seam Carving for Video Resizing" here: https://www.youtube.com/watch?v=AJtE8afwJEg

The video starts off not very impressive, but once they get to the forward energy method, it' pretty cool how it is able to show video with objects and edges that are smooth frame to frame.

One of the neat use cases was to remove shaky camera effects.

Seam Carving is available as the Liquid Rescale plug-in in GIMP

http://liquidrescale.wikidot.com/

It DOES use GIFT - http://github.com/disintegration/gift, but eh.. it works

"We can see that the area with the least visual information (the sky) has been reduced while other regions of the image such as the boat, water, and buildings, remain intact."

Except the tower on the right has been "redesigned" by the algorithm.

... It's a feature! Algorithms with input on design are the new hotness.

Well, I can't get to the site now, but I've seen seam carving before. What's impressive about seam carving is the bang-for-the-buck... it's a rather simple algorithm that has quite spectacular results. But it's certainly not perfect. When you're taking an image like that and throwing away information, there isn't a definition of "perfect" anyhow. Information is being discarded, so, information will be lost. The question is what distortion the image will have, not whether the image is distorted.

The castle looks exactly the same... what was "redesigned" ?

Original: https://upload.wikimedia.org/wikipedia/commons/c/cb/Broadway...

Seam carved: https://upload.wikimedia.org/wikipedia/commons/e/ed/Broadway...

You don't notice the difference between the proportions and distance between the woman/sky and the castle?

The clouds are much smaller/thinner and the woman is a fraction of the distance apart.

(Edit: Nevermind, I mistakenly thought you were trying to say you didn't see a difference. Not that you were countering their point that the castle was "redesigned".)

That is what seam carving does. What do you think was supposed to happen?

Look at the pics again, the castle is exactly the same. The grass, sky and distance between person has been changed. The whole point is to shrink the dimensions by keeping the main things as they are in size, detail and proportion and cutting out the stuff in the middle.

No kidding. In the comment I was replying to you said you didn't see a difference.

(Nevermind, I misunderstood your comment.)

Seam carving works great on scenary images. I have accidentally used it on a collection of portraits, and every image ends up at the bottom of uncanny valley. They are so frightening that I can't look at the thumbnails and have to remove them under cmd.

The github repo: https://github.com/aaparella/carve

I found the video, where they just vanished a person out of a picture, to be a mite disturbing. Stalin would have loved that.

Why didn't you call it "parallelogram"?

Dude's last name is Parella

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