Novel Techniques to Enhance the Quantization Accuracy of Images

• Main Authors: Jian-Liang Lin, 林建良
• Other Authors: Prof. Hui Peng
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/24913227860694687582

碩士 === 國立清華大學 === 電機工程學系 === 87 === In digitizing images or signals, the results after A/D conversion are always quantized. Quantization will introduce uncertainty in image/signal values as compared to the original continuous-distributed image intensity or value of the physical signals, and will sometimes cause loss of important information, deterioration of image/signal quality and thereafter affect the effective useages of the image/signal data. In this thesis, we present a class of point-processing techniques to reduce the uncertainty of image/signal value caused by quantization. They utilizes several digitized images acquired via varying the transmittances of the inserted media, aperture or A/D conversion, and offer ways to combine these different images to provide a new image of finer quantization accuracy. Experimental results from tests on images show that these techniques do reduce quantization error greatly and provide an image of much better quality.