JP2707790B2 - Satellite imaging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite image pickup apparatus, and more particularly to an image pickup apparatus for removing an image shift caused by earth rotation occurring when a same-point target is imaged at a certain time in a stereoscopic image or the like. The present invention relates to a satellite imaging device.

[Conventional technology]

Conventionally, even in radiometers that image the earth or the like from a satellite and perform stereoscopic vision, especially image shift due to earth rotation is not considered, and when imaging the same point that can be stereoscopically viewed by earth rotation after a certain time elapses, All data was transmitted to the ground with the proportion of images at the same spot decreasing. Further, when creating a stereoscopic image, an operation of selecting a portion where the same point is imaged on the ground has been performed.

[Problems to be solved by the invention]

Since the conventional satellite imaging apparatus described above does not consider the influence of the earth rotation when capturing a stereoscopic image, in imaging in a low-latitude region, even if the imaging angle is changed, the same point in the captured image is changed. However, there is a disadvantage that the ratio of the part which can be stereoscopically imaged is reduced. In addition, since image data of a part that cannot be viewed in a stereoscopic manner is also transmitted, there is a disadvantage that the amount of data transmission is wasted.

[Means for Solving the Problems] The satellite imaging apparatus of the present invention is a satellite imaging apparatus that performs forward and backward imaging of a target point from a satellite orbit in order to perform stereoscopic imaging. It has a field of view wider than the required field of view and shifts the field of view of the rear imaging device in the direction of rotation of the earth.

In a satellite imaging device that performs forward and backward imaging of a target point from a satellite orbit in order to perform stereoscopic imaging, the forward and backward imaging devices have a wider field of view than the required field of view, and the imaging device is positioned in the rotation direction of the earth. It is characterized by having an image selecting means for selecting only data that can be stereoscopically viewed from image data obtained by shifting the field of view.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of the concept of imaging according to an embodiment of the present invention. The embodiment of FIG. 1 shows the field of view of the imaging device at T and at T 'after a certain time has elapsed. 1 is an imaging device, 2 is a field of view for front imaging, 3 is a field of view for rear imaging, and represents a field of view at time T. At time T 'after a predetermined time, a field of view for rear imaging 3A and a target at the same point as the field of view 2 for front imaging. 4 to obtain a stereoscopic image. FIG. 2 is an explanatory view showing the principle of imaging in the low latitude region according to the present embodiment. In the figure, the top is T
Represents the front field of view of the imaging device 1 at the time, and the lower part represents the rear field of view at the time T '. That is, as can be understood from FIG. 1, in order to perform stereoscopic imaging, the upper part and the lower part need to be the same point target. Hereinafter, an operation satisfying this requirement will be described in the present invention. A _{2 at the} top of Fig. ₂
Represents the forward field of view of the imaging apparatus 1, B ₂ denote the stereoscopically viewable region that is a predetermined trimming. In the figure, because of the influence of the Earth's rotation 6 at T and at T 'o'clock, in the lower part of the figure, the width of the rear-view 3A is represented by A _3, which, if not changed imaging angle of the imaging device 1 Are shifted by the width C due to the influence of the rotation 6 of the earth. Therefore, it is necessary to shift the imaging angle by the previous width C in the imaging at T ′, and in the present invention, the imaging is performed by shifting the imaging angle by the previous width C. Further, deviation of the imaging angle of lower latitudes is greater than the displacement of the high-latitude imaging angle, in the rear-view, the rear of the stereoscopically viewable region B ₃ is shifted to the right to be trimmed by further width D. Stereoscopically visible region B ₂ of the front visual field of FIG. 2 upper represents the region corresponding to the stereoscopic region B ₃ of the rear.

In the case of imaging in a polar region at a high latitude, it is only necessary to shift the imaging angle by the rotation of the earth 6 (width C) as shown in FIG.

Next, the main part and operation of the configuration of the imaging apparatus for realizing the principle of the present embodiment will be described with reference to the block diagram of FIG. In FIG. 4, reference numeral 8 denotes a front imaging device, 9 denotes a rear imaging device, 10 denotes a buffer memory, 11 denotes trajectory information, and 12 denotes a data output control circuit, which outputs a signal to the buffer memory 10 so as to output only stereoscopically visible data. Is sent. Reference numeral 13 denotes a data array circuit which stores data from both buffer memories 10 as orbit information 11
Is selected based on, and rearranged in series data so that transmission is possible. As an application example of the present invention, a method of selecting the operation of the buffer memory 10, the data output control circuit 12, and the data array circuit 13 on the ground is also possible. In addition, as an application of this method, the present invention can be applied to all cases where a target moves with a certain known motion when the same point is imaged with a certain time lag and a lag occurs.

〔The invention's effect〕

As described above, according to the present invention, by automatically selecting and controlling a stereoscopically viewable region in a rear view field of view after a certain time has elapsed, stereoscopic view due to the effect of earth rotation occurring in stereoscopic imaging from an artificial satellite can be performed. Eliminating the reduction of the area and eliminating the amount of data that cannot be stereoscopically included in the transmission data has the effect of reducing the amount of transmission data.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 and FIG.
FIG. 4 is an explanatory view of the principle of the present embodiment, and FIG. 4 is a block diagram of a main part of the imaging apparatus of the present embodiment. 1 ... imaging device, 2, 2A ... forward imaging field of view, 3, 3A ... rear imaging field of view, 4 ... same point target, 5, 7 ... stereoscopically visible area, 6 ... earth rotation, 8 …… Front imaging device, 9 ……
Rear image pickup device, 10 buffer memory, 11 orbit information, 12 data output control circuit, 13 data array circuit.

Claims (1)

(57) [Claims] In a satellite imaging apparatus for performing forward and rearward imaging of a target point from a satellite orbit in order to perform stereoscopic imaging, a field of view in said forward imaging and rearward imaging is larger than a field of view in which stereoscopic imaging is performed. An imaging apparatus for a satellite, which has a wide field of view and shifts the imaging field of view in the direction of rotation of the earth when the same target point is imaged from front to rear.