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AssigneeKorea Advanced Institute of Science and Technology
InventorsTae Jung Kim, Yong Jo Im
Estimating the term…
There is provided an image processing method for use in a computer system having a database for storing a reference image, control point chips (CP chips) of the reference image, and auxiliary data including geographic coordinates, incidence angles and orientation angles of the reference image and the CP chips, comprising the steps of (a) a CP chip extraction step of, when a target image and auxiliary data including location information and incidence and orientation angle information of the target image are inputted, finding out a region of the reference image corresponding to a region including the target image, selecting the found region as a control region, and extracting the CP chips included in the control region of the reference image, (b) an image matching step of searching matching points of the target image for the control points within the CP chips extracted from the CP chip extraction step, (c) a mismatching point removing step of finding out and removing mismatching points among matching results obtained from step (b), and (d) a precise image correction step of arranging the target image into a geographic coordinate system using the matching results obtained after performing step (c).
An image processing method for use in a computer system having a database for storing a reference image, control point chips (CP chips) of the reference image, and auxiliary data including geographic coordinates, incidence angles and orientation angles of the reference image and the CP chips, comprising:
A computer-readable recording medium in which a program for use in a computer system having a database for storing a reference image, control point chips (CP chips) of the reference image, and auxiliary data including geographic coordinates, incidence angles and orientation angles of the reference image and the CP chips is recorded, said program comprising instructions for causing the computer system to implement:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Image enhancement or restoration: geometric correction
Using feature-based methods: involving reference images or patches
Determination of transform parameters for the alignment of images, i.e. image registration: using statistical methods
Image analysis: analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
Term ended 14 Apr 2024 (estimated)
The present application claims priority from Korean patent application no. 2002-49753, filed Aug. 22, 2002, presently pending.
1. Description
The present invention relates to a method for processing a satellite image or general image, and more particularly, to a method for automatically performing an image matching process, an image registration and a precise correction process.
The above and other objects, advantages and features of the present invention will become apparent from the following description of a preferred embodiment given in conjunction with the accompanying drawings, in which:
FIG. 1 is a flowchart illustrating operating procedures of an image processing method according to the present invention;
FIG. 2 is a view showing a state where a control region of a reference image is selected using auxiliary data on a target image;
Hereinafter, a preferred embodiment of an image processing method according the present invention will be explained in detail with reference to the accompanying drawings.
The present invention is an algorithm running in a general computer system. The general computer system comprises a conventional input/output device, a microprocessor for controlling the system as a whole, a ROM for storing the image processing algorithm of the present invention and providing the microprocessor with the algorithm, a RAM for storing temporary data produced while the microprocessor executes the image processing algorithm of the present invention, and a database for storing data needed for performing the image processing algorithm of the present invention.
The database includes a reference image, control point chips (CP chips) of the reference image, and auxiliary data. Here, the CP chips mean images which are cut from the reference image in a predetermined size around control points. The auxiliary data mean records of a satellite state and an image state at the time of photographing a satellite image. The information included in the auxiliary data may be slightly different from one another depending on the kinds of satellites. However, the auxiliary data generally include information on when the satellite image has been photographed, information on the satellite, and information on a tilt angle, incidence angle and orientation angle of the satellite image. The information on when the satellite image has been photographed includes date and time when photographed. The information on the satellite includes orbit information such as a location and velocity of the satellite and brief coordinate information (including an error range). The tilt angle of the satellite image is a photographing angle when the satellite image is photographed, the incidence angle is an angle between a camera and a surface of the earth, and the orientation angle is an angle between a true north direction and a photographing direction. Besides, the auxiliary data may include other information such as a processing level, a calibration parameter, gain/offset values, and an image size.