Mountains on the background are being shrunk smoothly without visible seams. Here are some more examples of how the algorithm copes with more complex backgrounds. You may also try its embed version below right away! This widget uses the Seam Carving algorithm that we're going to explore in this article. I've created the JS IMAGE CARVER web-app (and also open-sourced it on GitHub) that you may use to play around with resizing of your custom images.
by drawing a mask on top of them), the Seam Carving algorithm would perform an object removal for us for free. Now, if we set the pixel energy to some really low level artificially (i.e.
The importance of each pixel (so-called pixel's energy) is being calculated based on its color ( R, G, B, A) difference between two neighbor pixels. To make the seam search faster the dynamic programming approach might be applied (we will go through the implementation details below). Thus, the sky pixels are being removed first.įinding the seam with the lowest energy is a computationally expensive task (especially for large images). In the example below you may see that the hot air balloon pixels contribute more to the content of the image than the sky pixels. This process repeats over and over again until we get the required image width or height. The Seam Carving algorithm's idea is to find the seam (continuous sequence of pixels) with the lowest contribution to the image content and then carve (remove) it. In this particular case, the left image looks more natural since the proportions of the balloons were preserved. The example below shows how the original image width was reduced by 50% using content-aware resizing (left image) and straightforward scaling (right image). To preserve the proportions of the objects while changing the image proportions we may use the Seam Carving algorithm that was introduced by Shai Avidan and Ariel Shamir. Doing the straightforward image scaling in this case would distort the objects in it. reducing the width while keeping the height) and when losing some parts of the image is not desirable. Explain the dynamic programming approach to implement the algorithm (we'll be using TypeScript for it)Ĭontent-aware image resizing might be applied when it comes to changing the image proportions (i.e.Explain the idea behind the Seam Carving algorithm.Provide you with an interactive content-aware resizer so that you could play around with resizing your own images.
So, with this article I want to do three things: And, if you're like me and still on your "learning algorithms" journey, this algorithmic solution may enrich your personal DP arsenal. Another point that drew my attention (as a creator of javascript-algorithms repo) was the fact that Dynamic Programming (DP) approach might be smoothly applied to solve it. There are many great articles written about the Seam Carving algorithm already, but I couldn't resist the temptation to explore this elegant, powerful, and yet simple algorithm on my own, and to write about my personal experience with it.
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