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    • 7. 发明授权
    • Method for orthocorrecting satellite-acquired image
    • 正交校正卫星获取图像的方法
    • US06810153B2
    • 2004-10-26
    • US10128586
    • 2002-04-24
    • Fuminobu KomuraKouji UedaTakashi HinoTakatoshi Kodaira
    • Fuminobu KomuraKouji UedaTakashi HinoTakatoshi Kodaira
    • G06K932
    • G06T3/0081G06T5/006
    • A method is provided for the orthocorrection of a satellite-acquired image. This method can be applied even if ground control points are not set. Without propagation of an error throughout the image and also without needing an excessively large amount of calculations, the method makes it possible to correct ground-relief-associated distortions caused by the relief of a ground surface. According to the method, a plurality of control planes of different elevations are set relative to a control plane of a zero elevation of a reference rotating ellipsoidal earth model. A corrected image is divided into blocks by lattices of equal intervals. With respect to each of these blocks, distortion model formulas in the form of bilinear functions are determined for the respective control planes. Concerning each pixel position in the corrected image, two pixel positions in an observed image, which correspond to the elevation value of the pixel position in the block, are calculated by using distortion model formulas for two control planes which directly sandwich the value of elevation above and below the value in the corresponding block. By the value of elevation, the two pixel positions are linearly interpolated to determine the desired pixel position in the observed image.
    • 提供了一种用于卫星获取图像的正交校正的方法。 即使未设置地面控制点,也可以应用该方法。 不会在整个图像中传播错误,并且也不需要过大的计算量,所以该方法可以校正由地面浮雕引起的与地面相关的失真。 根据该方法,相对于参考旋转椭圆体土体模型的零高度的控制平面设定不同高度的多个控制平面。 校正图像通过等间隔的格子被划分成块。 对于这些块中的每一个,对于各个控制平面确定双线性函数形式的失真模型公式。 关于校正图像中的每个像素位置,通过使用直接夹着上述值的两个控制平面的失真模型公式来计算观察图像中与块中的像素位置的高程值相对应的两个像素位置 并低于相应块中的值。 通过高程值,将两个像素位置进行线性插值,以确定观察图像中所需的像素位置。