SPACE TRANSFORMATION FOR HSL MODEL ENCODING

Common compression systems treat color image channels similarly, but while nonlinear color models like Hue-Saturation - Value/ Brightness/ Luminance/ Lightness (HSV/ HSB/ HSL/ HSI) have special feature for each channel, a new hybrid compression system is proposed for encoding color images in HSL color model using new transformation function (YLD). The proposed encoding system deals with each channel with a suitable compression technique to obtain encoded images with less size and high decoding quality than the traditional encoding methods. There are three encoding techniques will be mixed in our proposed system; Object Compression Technique for the Hue channel, Luma(Y) Lightness (L) Difference (D) - for Saturation, and the standard Jpeg2000 encoding technique for the Lightness channel. The proposed system results in very high compression ratio with very good decoding quality