System, method and program for perspective projection image creation, and recording medium storing the same program

• US 20020181803A1
• Filed: 05/09/2002
• Published: 12/05/2002
• Est. Priority Date: 05/10/2001
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kawakami, Kenichi, Kumata, Kiyoshi
• Granted Patent: US 6,947,611 B2
• Time in Patent Office: Days
• US Class Current: 382/293
• CPC Class Codes: H04N 23/58 Means for changing the camera field of view without moving the camera body, e.g. nutating or panning of optics or image sensors
• CPC Class Codes: H04N 5/2628 Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation

Abstract

A perspective projection image creation system of the present invention includes: an optical system including a hyperboloidal mirror; an imaging section receiving light so as to create input image data; an image transformation section transforming input image data obtained by the imaging section into image data of a perspective projection; a scale model creation section transforming image data for an object in an object plane into image data for a scale model of the object such that a size of the scale model of the object corresponds to that of the object in a perspective projection image; an image combining section creating combined image data created by combining the perspective projection image data and the image data for the scale model: and a display section displaying the combined image data.

Claims

1. A perspective projection image creation system, comprising:

an optical system including a hyperboloidal mirror which has a hyperboloidal shape of one sheet of a two-sheeted hyperboloid;

an imaging section receiving light concentrated by a lens opposed to the hyperboloidal mirror so as to create input image data;

an image transformation section transforming input image data obtained by the imaging section into image data of a perspective projection having a projection center at a focal point of the hyperboloidal mirror;

a scale model creation section transforming image data for an object in an object plane perpendicular to a line extending through a focal point of the hyperboloidal mirror into image data for a scale model of the object, based on a ratio of a distance between the focal point of the hyperboloidal mirror and the object plane to a distance between the focal point of the hyperboloidal mirror and a perspective projection image plane, such that a size of the scale model of the object corresponds to that of the object in a perspective projection image;

an image combining section creating combined image data created by combining the perspective projection image data and the image data for the scale model; and

a display section displaying the combined image data.

2. A perspective projection image creation system according to claim 1, wherein the object plane is a ground plane.

3. A perspective projection image creation system according to claim 1, wherein the distance between the projection center and the perspective projection image plane is represented by the number of pixels each of which represents a minimum unit of resolution of an image.

4. A perspective projection image creation system according to claim 1, wherein the image data of the scale model is created based on information with respect to a target object for the scale model in the object plane.

5. A perspective projection image creation system according to claim 4, wherein the information includes original image data, which is the image data for the target object, an actual size of the target object, and data with respect to the distance between the focal point of the hyperboloidal mirror and the object plane.

6. A perspective projection image creation system according to claim 1, wherein the scale model creation section creates the image data of the scale model by enlarging/reducing a size of the original image data, which is the image data for a target object, based on the ratio of the distance between the focal point of the hyperboloidal mirror and the object plane to the distance between the focal point of the hyperboloidal mirror and a perspective projection image plane.

7. A perspective projection image creation system according to claim 1, further comprising a second optical system similar to the first optical system, the system creating perspective projection image data, which has a projection center at a focal point of a hyperboloidal mirror in the second optical system and corresponds to the scale model, by calculating a distance between the focal point of the hyperboloidal mirror in the second optical system and a perspective projection image plane having a projection center at the focal point in the second optical system based on the image data for the scale model created by the scale model creation section.

8. A perspective projection image creation system according to claim 1, wherein the image data for the scale model is a gauge model representing a length in an image.

9. A method for creating a perspective projection image, comprising the steps of:

obtaining input image data using an omnidirectional vision sensor, the omnidirectional sensor including an optical system which includes a hyperboloidal mirror having a hyperboloidal shape of one sheet of a two-sheeted hyperboloid and the omnidirectional sensor including an imaging section which receives light concentrated by a lens opposed to the hyperboloidal mirror so as to obtain input image data;

transforming input image data obtained by the imaging section into image data of a perspective projection having a projection center at a focal point of the hyperboloidal mirror;

creating a scale model by transforming image data for an object in an object plane perpendicular to a line extending through a focal point of the hyperboloidal mirror into image data for a scale model of the object, based on a ratio of a distance between the focal point of the hyperboloidal mirror and the object plane to a distance between the focal point of the hyperboloidal mirror and a perspective projection image plane, such that a size of the scale model of the object corresponds to that of the object in a perspective projection image;

combining the perspective projection image data and the image data for the scale model so as to create combined image data created; and

displaying the combined image data.

10. A perspective projection image creation program for carrying out the method for creating perspective projection image according to claim 9.

11. A computer readable recording medium storing a perspective projection image creation program for carrying out the method for creating a perspective projection image according to claim 9.