【摘要】 60Co集装箱CT系统的"物性鉴别"特性要求只能采用无损压缩方法处理辐射图像。由于辐射图像的灰度范围广和统计涨落大等特点,常规无损熵编码法难以取得理想效果。据此引入整形小波变换对辐射图像进行压缩处理,取得了优于传统熵编码的压缩效果。更多还原

【Abstract】 In order to meet the request of "characteristics discrimination", it is necessary for the ⁶⁰Co container CT system to compress radiant images by lossless method. But because of the wide gray-scale range and high statistical noise of radiant images, it is difficult to obtain effective compression rate by traditional entropy encoder. In this article, a novel transform method, integer wavelet transform, is introduced and a compression scheme for radiant images is put forward. The experimental results prove that the scheme is proved to be better than the entropy encoder.更多还原