However , the long codes of random - generated ldpc are unfortunately sufferd from a defect of high encoding complexity ; especially the storage of generator matrix is considerably large during the encoding process . therefore , by way of making ldpc become realizable in the applications , it ’ s particularly important to search families of ldpc codes which may possess some algebraic structural properties 盡管如此,由于隨機構(gòu)造的ldpc長碼在編碼上有著較高的復(fù)雜度,特別是編碼過程中還需要消耗大量的資源來儲存生成矩陣,因此為了讓ldpc碼能夠在實踐應(yīng)用中成為可行,搜尋具有一定代數(shù)結(jié)構(gòu)的ldpc碼就變得尤為重要。
A new remote sensing image coding scheme based on the biorthogonal wavelet transform and revised spiht algorithm is proposed according to the statistical characteristic of remote sensing image data . the experimental results show that the proposed scheme could largely speed up the encoding process and reduce computational complexity on condition that reconstructed image quality is sacrificed little . meanwhile , this scheme has advantage over other algorithms in real time encoding 本文針對遙感圖像的數(shù)據(jù)特點,提出了結(jié)合雙正交小波變換和改進spiht算法的內(nèi)嵌小波編碼方案.實驗結(jié)果表明,本文的方法能夠在幾乎不降低恢復(fù)圖像質(zhì)量的前提下降低了計算復(fù)雜度,提高了編碼速度,有利于實時編碼