Imaging apparatus
First Claim
1. an imaging apparatus comprising:
- a lens;
an imaging device that detects light focused by the lens at a plurality of detection points;
and an image processing unit that generates image data for displaying an image on a display screen having a predetermined area, on the basis of image signals detected at the detection points of the imaging device,wherein the image processing unit performs image processing to enlarge a section, which is a portion of the image captured by the imaging device, and displays the enlarged image on the display screen, and in the image processing, an enlargement ratio of a field angle varies depending on the place in the section,wherein, in the image processing, the enlargement ratio of the field angle in an X-axis direction corresponding to a horizontal axis of the display screen, and the enlargement ratio of the field angle in a Y-axis direction that is orthogonal to the X-axis direction are changed on the basis of a predetermined change function, andwherein, in the image processing, the following processes are performed on each pixel Pi of the display screen, and a process of making the pixels Pi correspond to image signals of the detection points of the imaging device is performed;
(1) a process of substituting the X-axis coordinate of the pixel Pi on the display screen into the change function to calculate a field angle α
x in the X-axis direction corresponding to the coordinate and substituting the Y-axis coordinate of the pixel Pi on the display screen into the change function to calculate a field angle (α
y in the Y-axis direction corresponding to the coordinate;
(2) a process of calculating the positions rx and ry of an image point of a display image on the basis of a focal length f corresponding to the enlargement ratio of the display image, the field angle α
x, and the field angle α
y;
(3) a process of calculating a zenith angle θ
i and an azimuth angle Φ
i of a spatial point to be projected onto the pixel Pi on the basis of the positions rx and ry;
(4) a process of making the pixel Pi correspond to the image signal detected at any one of the detection points of the imaging device on the basis of the zenith angle θ
i, the azimuth angle Φ
i, and a projection polynomial of the lens; and
(5) a process of performing the processes (1) to (4) on all the pixels of the display screen.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is an imaging apparatus capable of enlarging a portion of an image captured by an imaging device of a fisheye camera and displaying the enlarged image on a display screen with little distortion. The imaging apparatus enlarges a section, which is a portion of an image captured by a fisheye camera, and displays the section on a display screen such that the enlargement ratios of points in the section are different from each other. An image processing method uses a change function that changes the enlargement ratio of a field angle depending on the place is used, and converts a portion of the captured image into a central projection image to generate a display image. The use of the change function makes it possible to generate a display image having high visibility.
-
Citations
11 Claims
-
1. an imaging apparatus comprising:
- a lens;
an imaging device that detects light focused by the lens at a plurality of detection points; and an image processing unit that generates image data for displaying an image on a display screen having a predetermined area, on the basis of image signals detected at the detection points of the imaging device, wherein the image processing unit performs image processing to enlarge a section, which is a portion of the image captured by the imaging device, and displays the enlarged image on the display screen, and in the image processing, an enlargement ratio of a field angle varies depending on the place in the section, wherein, in the image processing, the enlargement ratio of the field angle in an X-axis direction corresponding to a horizontal axis of the display screen, and the enlargement ratio of the field angle in a Y-axis direction that is orthogonal to the X-axis direction are changed on the basis of a predetermined change function, and wherein, in the image processing, the following processes are performed on each pixel Pi of the display screen, and a process of making the pixels Pi correspond to image signals of the detection points of the imaging device is performed; (1) a process of substituting the X-axis coordinate of the pixel Pi on the display screen into the change function to calculate a field angle α
x in the X-axis direction corresponding to the coordinate and substituting the Y-axis coordinate of the pixel Pi on the display screen into the change function to calculate a field angle (α
y in the Y-axis direction corresponding to the coordinate;(2) a process of calculating the positions rx and ry of an image point of a display image on the basis of a focal length f corresponding to the enlargement ratio of the display image, the field angle α
x, and the field angle α
y;(3) a process of calculating a zenith angle θ
i and an azimuth angle Φ
i of a spatial point to be projected onto the pixel Pi on the basis of the positions rx and ry;(4) a process of making the pixel Pi correspond to the image signal detected at any one of the detection points of the imaging device on the basis of the zenith angle θ
i, the azimuth angle Φ
i, and a projection polynomial of the lens; and(5) a process of performing the processes (1) to (4) on all the pixels of the display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a lens;
Specification