Keyphrases
- sparse coding
- compression ratio
- neural network
- coding method
- image compression
- image quality
- dictionary learning
- natural images
- compression algorithm
- sparse representation
- linear combination
- reconstructed image
- image classification
- unsupervised learning
- deep belief networks
- lossless compression
- generative model
- image representation
- pattern recognition
- image patches
- sparse codes
- feature space
- multiscale
- visual words
- bag of words
- subband
- small number
- high dimensional
- em algorithm
- image data
- similarity measure
- image processing