For the high frequency coefficient which expresses image details, we use the local variance to divide the high frequency component into smooth region, medium contrast region and high contrast region. 对表示图像细节的高频系数,根据局部方差的大小,将之分为低对比度区(平滑区)、中等对比度(MC)区和高对比度区。
All patients in this report have been diagnosed by B model ultrasonic and cholangiography by taking medium contrast orally or iv. 本组病例均经B超诊断,口服或静脉胆道造影检查。
Using herbal containing group and non-herbal containing cultured by solid and liquid medium as contrast. 采用非致死量含药和无药,固体和液体培养。
In this paper the shooting method is applied to solving a one-dimensional electromagnetic field in ferromagnetic medium. In contrast to finite difference method it has higher precision and avoids complicated calculations in solving a system of equations in each iteration. 本文用试射法求解铁磁媒质中一维非线性正弦电磁场问题,比用差分法的精度高,并且省去了差分法中每次迭代都要求解一个大型方程组的过程。
Purpose : To explore the risk factors of nonionic contrast medium to induce contrast media nephropathy, CMN. 目的:探讨非离子型造影剂导致造影剂肾病的危险因素。