A Relative Quality Controled Region-of-interest Image Coding Based on Wavelet Transform
نویسندگان
چکیده
A region-of-interesting (ROI) image coding based on wavelet transform that can control the image quality between ROI and region-of-non-interesting (non-ROI) under a constrained quantity of information will be proposed in this paper. We introduce a scalar parameter referred as to control, and is ratio of the quality ROI to non-ROI and is relative measure. Assignment of the total quantity of information, i.e. bit-rate, to each region can be derived analytically by the method of Lagrange multipliers. And a method which can reduce the information quantity of the shape of ROI/nonROI to be transmitted to the receive end as a side-information will be also proposed. Our method can avoid so many information loss for nonROI at lower constrained bit-rate caused in JPEG-2000, therefore the subjective image quality for whole of restored image will be improved, maintaining the quality of ROI is higher than the non-ROI.
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