# Animation Compression: Main Compression Families

13 Nov 2016Over the years, a number of techniques have emerged to address the problem of character animation compression. These can be roughly broken down into a handful of general families:

- Simple Quantization: Simply storing our key values on fewer bits
- Advanced Quantization: Super charge our simple quantization with a variable bit rate
- Sub-sampling: Varying the sampling rate to reduce the number of key frames
- Linear Key Reduction: Removing keys that can be linearly interpolated from their neighbours
- Curve Fitting: Calculating a curve that approximates our keys
- Signal Processing: Using signal processing mathematical tools such as PCA and Wavelets

Note that simple quantization and sub-sampling can be and often are used in tandem with the other three compression families although they can be used entirely on their own.