Document image enhancement using adaptive directional lifting-based wavelet transform.
Chih-Hsien HsiaHoang Thi Huong GiangHan-Yen TuPublished in: ICCE-TW (2015)
Keyphrases
- image contrast enhancement
- image enhancement
- wavelet transform
- daubechies wavelet
- multiresolution
- histogram equalization
- multiscale
- contrast enhancement
- image processing
- gray level
- image compression
- edge detection
- wavelet coefficients
- image processing and analysis
- subband
- wavelet domain
- feature extraction
- image analysis
- lifting scheme
- noise removal
- median filter
- unsharp masking
- high frequency
- color restoration
- color image enhancement
- low frequency
- partial differential equations
- enhanced image
- high pass
- translation invariant
- machine learning
- gamma correction
- minutiae extraction
- image segmentation
- image data
- co occurrence