Image Processing Basics — Tutorials and Interactive Applets

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ImageProcessingBasics.com

Digital image processing tutorials and interactive applets

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ImageProcessingBasics.com has a collection of informative and interactive Java applets explaining basic digital image processing concepts.

Each applet is accompanied by a short tutorial explaining the underlying theory it is trying to convey. Furthermore, comments are welcome and are displayed at the bottom of the page for each topic.

Our currently available tutorials/applets:

Spatial resolution

Explains the Rayleigh spatial resolution limit.

Sampling and aliasing

See how different sampling resolutions can cause aliasing, and how to do anti-aliasing.

Pixel re-quantization

Explore in real time the effects of changing the number of pixel quantization levels.

Geometric transforms

See the effects of varying the parameters in the affine geometric transform.

Graylevel transforms

Interactively explore the effect of changing the parameters in graylevel transform functions.

Histogram equalization

Perform histogram equalization or do some histogram specification interactively.

Local graylevel mapping

Perform local graylevel mapping, both equalization and linear graylevel transforms.

Convolution-based filters

Edit convolution kernels, and immediately see the resulting images and the kernels' frequency responses.

RGB-to-grayscale projection

Study how digital color images are composed of red, green and blue (RGB) layers, and interactively control (simple) rgb-to-grayscale projections.

Color lookup tables

Choose between common approaches to building color lookup tables, understand the reasoning behind them, and study their effect.

April 29, 2012: Sticking to brightening up; an applet on color lookup tables is here! A tutorial text is, eh, to follow.

Feb 25, 2012: Color me gray! The accompanying tutorial text for the RGB-to-grayscale applet is out.

Nov 3, 2011: A new, colorful applet on RGB-to-grayscale conversion is now available! A tutorial text is soon to follow.

July 17, 2011: Finally, the accompanying tutorial text for the new convolution-based filters applet is here!

May 29, 2011: Clumsiness on our part caused some of the applets to fail loading the last couple of weeks. We offer you our humble apologies.

May 1, 2011: A new applet on convolution-based filters is now available! A tutorial text is soon to come.

Feb 12, 2011: Our applet on image sampling and aliasing is now updated. The confusing black border when doing antialiasing is now gone!

Feb 8, 2011: By popular request, the x-y axes have been switched to agree with the more common row-column form in our applet on geometric transforms.

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