搜狗做题网英语翻译To avoid variations in brightness due to shading effects
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英语翻译
To avoid variations in brightness due to shading effects we initially assume that
the surface being imaged is flat.We further assume that the incident illumina-
tion is uniform across the surface.The brightness at a point in the image is then
proportional to the reflectance of the surface at the corresponding point on the
object.Also,we assume at first that reflectance varies smoothly and has no
spatial discontinuities.This latter condition assures us that the image brightness
is differentiable.We exclude situations where objects occlude one another,in
part,because discontinuities in reflectance are found at object boundaries.In
two of the experiments discussed later,some of the problems occasioned by
occluding edges are exposed.
In the simple situation described,the motion of the brightness patterns in the
image is determined directly by the motions of corresponding points on the
surface of the object.Computing the velocities of points on the object is a
matter of simple geometry once the optical flow is known.
To avoid variations in brightness due to shading effects we initially assume that
the surface being imaged is flat.We further assume that the incident illumina-
tion is uniform across the surface.The brightness at a point in the image is then
proportional to the reflectance of the surface at the corresponding point on the
object.Also,we assume at first that reflectance varies smoothly and has no
spatial discontinuities.This latter condition assures us that the image brightness
is differentiable.We exclude situations where objects occlude one another,in
part,because discontinuities in reflectance are found at object boundaries.In
two of the experiments discussed later,some of the problems occasioned by
occluding edges are exposed.
In the simple situation described,the motion of the brightness patterns in the
image is determined directly by the motions of corresponding points on the
surface of the object.Computing the velocities of points on the object is a
matter of simple geometry once the optical flow is known.
为了避免由于阴影效果,我们最初的假设是平坦的表面成像亮度变化.我们进一步假设事件Illumina和均匀的表面.在图像中的一个点的亮度在该对象上的对应点的后表面的反射比例.同时,我们认为,首先,反射率的变化平稳,没有空间的不连续性.这后者的条件向我们保证,图像的亮度是可微的.我们排除的情况下,一个对象闭塞,部分,因为不连续的反射在物体边界的发现.在两个实验探讨了一些问题后,由于遮挡边缘暴露.在简单的情况介绍,亮度图案的图像中的运动是由对应点的对象的表面上运动的直接测定.计算对象上的点的速度是一个简单的几何光学流量是已知的一次.
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