Method for providing services on online geometric correction using GCP chips

• US 7,379,614 B2
• Filed: 06/22/2004
• Issued: 05/27/2008
• Est. Priority Date: 12/26/2003
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Cho, Seong Ik, Yoon, Geun Won, Yun, Youngbo, Hwang, Tae Hyun, Park, Jong Hyun
• Primary Examiner(s): Bella; Matthew C.
• Assistant Examiner(s): PERUNGAVOOR, SATHYANARAYA V
• Application Number:
  US10/872,384
• Publication Number:
  US 20050140784A1
• Time in Patent Office: 1,435 Days
• Field of Search: 382/255
• US Class Current: 382/255
• CPC Class Codes: G06T 2207/30181 Earth observation
• CPC Class Codes: G06T 5/80 Geometric correction

Abstract

Disclosed is a method for providing services on online geometric correction using, in which information related with GCP (Ground Control Point) used for correcting geometric distortion of an image collected by an aircraft or a satellite are transmitted online through Internet network, thereby allowing a user at a remote place to perform geometric correction or ortho-rectification. In the geometric correction process, the image information related with the GCP is provided but the precise geographic coordinate of the GCP itself is not provided to thereby maintain the secretion of detailed geographic information.

Claims

1. A method for providing services on online geometric correction using ground control point (‘

GCP’

) chips, the method comprising the steps of;

(a) when communication starts between a client of a user computer and a GCP server managing a GCP chip database, providing the GCP server with a spatial range information of an object image for correction;

(b) reporting GCP chip image and supplementary information relating with the object image to the client;

(c) searching a corresponding point from the object image using the GCP chips;

(d) providing the corresponding information to the GCP server;

(e) calculating a correction equation for geometric correction or ortho-rectification concurrently using the provided information and precise geographic coordinate information of the GCP;

(f) reporting the calculated correction equation to the client; and

(g) performing a correction of the object image using the correction equation and the object image and then ending the communication between the GCP server and the client.

2. The method of claim 1, wherein the spatial range information of the step (a) comprises resolution of the object image for correction, and geographic coordinates of four corners.

3. The method of claim 1, wherein the GCP chip image and supplementary information of the step (b) comprise a base information, a GCP chip information and supplementary information.

4. The method of claim 3, wherein the base information comprises a serial number of the GCP, a serial number of map including the GCP, manufacturer and manufactured date and time of information related with the GCP, a name of the place representing the GCP, and an address of the GCP or an address of an adjacent place,

the GCP chip information comprises a satellite image chip made by extracting a region including the GCP from a satellite image, and an aerial photograph chip made by extracting a region from an aerial photograph, and

the supplementary information comprises a topographical simulation view simulating a topography around the GCP, an on-spot ground photograph around the GCP or an on-spot photograph of a perceivable facility adjacent to the GCP, a person in charge or manufactured date and time of precise geographical coordinate of the GCP, and description on a place where the GCP is measured.

5. The method of claim 1, wherein the searching step (c) of the corresponding point comprises the steps of:

searching a specific measuring position indicated by the GCP chip image and supplementary information reported by the GCP server, from the object image for correction; and

establishing a correspondence relationship between an indicator representing the GCP and an image coordinate of the object image for correction.

6. The method of claim 1, wherein in the calculating step (e) of the equation for the geometric correction or ortho-rectification, the relationship between the GCP and the corresponding point representing a specific pixel is modeled by a below equation:

$\begin{array}{cc}\begin{array}{c}{r}_n=\frac{P_1<br><br>\left(x_n,y_{n,}<br><br>z_n\right)}{P_2<br><br>\left(x_n,y_{n,}<br><br>z_n\right)}\\ c_n=\frac{P_4<br><br>\left(x_n,y_{n,}<br><br>z_n\right)}{P_3<br><br>\left(x_n,y_{n,}<br><br>z_n\right)}\end{array}& \mathrm{Equation}<br><br><br><br>1\end{array}$

where r_n, c_n are respectively column position and row position of the specific pixel existing in the image,

and (x_n, y_n, z_n) is a three-dimensional coordinate of a specific position existing in ground.

7. A computer readable medium storing a computer program for implementing method for providing services on online geometric correction using ground control point (‘

GCP’

) chips including the function recited in claim 1.

8. A computer readable medium storing a computer program for implementing method for providing services on online geometric correction using ground control point (‘

GCP’

) chips including the function recited in claim 2.

9. A computer readable medium storing a computer program for implementing method for providing services on online geometric correction using ground control point (‘

GCP’

) chips including the function recited in claim 3.

10. A computer readable medium storing a computer program for implementing method for providing services on online geometric correction using ground control point (‘

GCP’

) chips including the function recited in claim 4.

11. A computer readable medium storing a computer program for implementing method for providing services on online geometric correction using ground control point (‘

GCP’

) chips including the function recited in claim 5.