Image pick-up device, image display device and information recording medium comprising a fisheye lens

Claim 2

An image pick-up device, comprising: a fisheye lens for picking up an image of all directions of a field of view around an optical axis of said fisheye lens at a field angle of at least 90° in each direction with respect to the optical axis, the fisheye lens having a relationship of h=n·f·tan(θ/m), h being a height of an image of a subject at a predetermined point obtained by the fisheye lens, f being a focal distance of the fisheye lens, θ being a field angle, m having a value of 1.6≦m<3, and n having a value of m-0.4<n≦m+0.4.

Claim 3

The image pick-up device of claim 1, wherein m and n are substantially equal.

Claim 4

The image pick-up device of claim 1, wherein m and n both substantially equal 2.

Claim 5

The image pick-up device of claim 1, wherein m and n both equal 2 such that the fisheye lens has a relationship of h=2f·tan(θ)/2).

Claim 6

The image pick-up device of claim 1, wherein the fisheye lens is constructed by a master lens provided on an existing image pick-up device and an attachment lens to be attached to the master lens.

Claim 7

An image display device, comprising: an image data processing unit for converting an image obtained by the image pick-up device of claim 1 into a plane image; and a display unit for displaying the converted plane image.

Claim 8

The image display device of claim 6, wherein said image data processing unit receives the image picked up by said fisheye lens.

Claim 9

The image display device of claim 6, wherein m and n are substantially equal.

Claim 10

The image display device of claim 6, wherein m and n both substantially equal 2.

Claim 11

The image display device of claim 6, wherein m and n both equal 2 such that the fisheye lens has a relationship of h=2f·tan(θ/2).

Claim 12

An information recording medium having recorded thereon a program including at least the steps of: converting into a plane image an image obtained by a fisheye lens for picking up an image of all directions of a field of view around an optical axis of said fisheye lens at a field angle of at least 90° in each direction with respect to the optical axis, said fisheye lens having a relationship of h=n·f·tan(θ/m), h being a height of an image of a subject at a predetermined point obtained by the fisheye lens, f being a focal distance of the fisheye lens, θ being a field angle, m having a value of 1.6≦m≦3, and n having a value of m-0.4≦n≦m+0.4; displaying a predetermined portion of the converted plane image on a display unit; and changing continuously the predetermined portion with instruction means.

Claim 13

An information recording medium having recorded thereon a program including at least the steps of: converting into a plane image an image obtained by a fisheye lens for picking up an image of all directions of a field of view around an optical axis of said fisheye lens at a field angle of at least 90° in each direction with respect to the optical axis, said fisheye lens having a relationship of h=n·f·tan(θ/m), h being a height of an image of a subject at a predetermined point obtained by the fisheye lens, f being a focal distance of the fisheye lens, θ being a field angle, m having a value of 1.6≦m≦3, and n having a value of m-0.4≦n≦m+0.4; displaying a predetermined portion of the converted plane image on a display unit; and changing continuously the predetermined portion with instruction means.

Claim 14

The information recording medium of claim 11, wherein m and n are substantially equal.

Claim 15

The information recording medium of claim 11, wherein m and n both substantially equal 2.

Claim 16

The information recording medium of claim 11, wherein m and n both equal 2 such that the fisheye lens has a relationship of h=2f·tan(θ/2).