为了解决这种情况，就必须对其进行投影变换（Projection Transform），将平截头体转换成一个立方体，并且将平截头体中投影平面的右上 角转换成立方体的中心并设为原点。
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Central Projection Transform 中心投影变换
2D projection transform 二维投影变换
map projection transform 地图投影变换
CT projection transform CT投影变换
d projection transform 二维投影变换
Guass projection transform 高斯投影变换
Radial projection transform 径向投影变换
As the binary image retrieval is concerned, the binary image retrievalis realized through using central projection transform. In the proposedmethod, image feature vector is generated by it’s central projection data, itis invariant to translation and scaling and rotating.
5.针对二值图像的检索问题,运用中心投影变换提取二值图像的特征实现二值图像的检索,该方法以二值图像的中心投影数据形成图像的特征向量,它具有平移、尺度和旋转不变性。
参考来源 - 图像模式分类与检索·2,447,543篇论文数据，部分数据来源于NoteExpress
The matrix applies a model view and projection transform;
投影纹理的关键是纹理变换矩阵的内容。
Second, we used to find out the intersect lines of shell and nozzles by the means of projection transform.
二是以往通常用投影转换的方法来求得筒体和接管的相贯线，这种方法放样困难、繁复且精度不高。
Utilizing the extended library provided by ERDAS IMAGINE, and by using the self-defined spheroid IAG75 the projection transform of raster data is achieved successfully.
此方法利用ERDAS IMAGINE的扩展库自定义新的投影椭球，用自定义的投影椭球对栅格数据成功地进行了投影变换。
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