تدريسي في قسم هندسة الطب الحياتي ينشر بحثا في مجلة
INCAS BULLETIN
حرصا على تقديم مايليق بسمعة الكلية و الجامعة من خلال البحث العلمي و المشاركات العلمية نشرالتدريسي في كليتنا / قسم هندسة الطب الحياتي , م.م. ياسر سلام عبد الغفور بحثه الموسوم:
Image Compression Using Wavelet Methods
في مجلة
INCAS BULLETIN” “
Abstract
Abstract: This paper aims to study and compare the compressionefficiencies of wavelet-bitmap and wavelet-Huffman. Both methods use wavelet todeduct a portion of the information in the image that can endure losing itwithout a significant disturbance in the image itself. Both methods deal withthresholding of wavelet coefficients to produce as much as possible zerocoefficients for the purpose of higher compression, then encode the non zerocoefficients by using Huffman encoding and bitmap drawing of the coefficientsdistribution resulted from thresholding inside the analyzed image. Theprocessing time is calculated using MATLAB. Results were taken to compare theefficiencies of the compression between the two methods. In this work wepresent a method based on wavelet transforms using Huffman encoding and bitmapencoding. Different combinations of parameters and transforms have beencompared. The result shows that the time of compression in wavelet-bitmapmethod is less than the time of compression which is taken by wavelet-Huffmanmethod. Also the compression ratio in the wavelet-Huffman is greater than the othermethod. The quality in both methods is relatively equal.