双三次插值是图像空域变换的经典算法，可用于图像旋转和放缩等灰度插值。
Bicubic interpolation is a classical algorithm used in spacial transformation of image such as image rotation and zooming.
当原始图像点乘以变换矩阵，得到新的图像位置点时，其位置可能不是整数值，该位置的灰度值需要通过灰度插值获得。
When the original image point multiply the transformation matrix, a new image position, the position may not integer, this position gray value by gray interpolation gain needed.
在常用的方法中，基于区域灰度平均的算法使图像模糊，而基于样条插值的算法计算耗时。
In the common methods, the algorithm based on the average of region gray makes image blur, and the algorithm based on spline interpolation wastes time.
研究了PV插值法导致错误配准的原因，提出了通过调整灰度级数来避免。
Researched the reason why PV interpolation may lead to wrong registration, and suggested to reduce gray levels to avoid the problem.
针对CCD成像时中间亮两边暗的畸变特点，用双线性插值的方法对图像进行灰度校正。
According to the imaging character of CCD, a new method to calibrate the distortion image is brought forward.
几何运算要求对图像进行灰度值插值，双线性算法可产生令人满意的效果，但是程序较复杂，运行时间较长。
Interpolation on gray images is needed in the course of geometric operation. Bilinear interpolation algorithm is effective, but its program is complex and the running time is longer.
我们主要分析了不同的插值方法，刀口，灰度拉伸，高度，角度对MTF的影响。
We also analyse different interpolating methods , knife edge, gray-draw, height, angle which effect Modulated Transfer Function(MTF).
灰度图像插值是体绘制的预处理步骤。
Gray scale image interpolation is a preprocessing step for volume rendering in medicine.
本论文所选用的双线性PV插值法不会引入新的灰度值，优于其它插值方法。
The double-linear PV interposition we select won't produce new intensity, so it is better than other interposition methods.
算法的核心内容是位置坐标的插值和灰度值的插值。
The key content of the algorithm is the interpolation of the position coordinate and the interpolation of grey scale.
其中优化迭代搜索过程又包括各参数优化算法的选取、坐标变换过程中灰度的插值计算等。
The optimal iterative search process includes the selection of the parameter optimization algorithm, the gray interpolation calculation during the process of coordinate transformation.
相邻帧配准差分去除恒星方法，在处理16位灰度图像时，由于高亮度恒星的插值误差大于目标灰度与背景之差，导致差分不能有效去除恒星干扰。
Registration and difference can't exclude stars when processing the 16-bit gray images because interpolation error of high light star is larger than the difference of target and background.
并提取一定灰度值的光斑圆周插值点，作为圆形光斑边缘。
The circular interpolated points with given gray-value are extracted as the verge of the spot.
通过比较分析几种常用的插值算法，采用基于灰度的线性插值方法对断层图像进行插值，有效地提高了三维重建的质量。
After comparing and analyzing several commonly used interpolation algorithms, we use the linear gray-based slice-image interpolation method to improve the quantity of 3d visualization.
通过比较分析几种常用的插值算法，采用基于灰度的线性插值方法对断层图像进行插值，有效地提高了三维重建的质量。
After comparing and analyzing several commonly used interpolation algorithms, we use the linear gray-based slice-image interpolation method to improve the quantity of 3d visualization.
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