JPH02127877A - Electronic still camera provided with fisheye lens - Google Patents

Abstract

PURPOSE:To reproduce a picture without distortion even if an object is picked up using a fisheye lens by providing a means storing a picture data converted into an electric signal and a means storing distortion information of the picture data through the fisheye lens, correcting the picture data based on the distortion information and outputting the result. CONSTITUTION:Nine areas sectioned in advance are decided to a fisheye pickup picture data stored in a picture data memory 13 and a memory address corresponding to each of the 9 areas is stored in a fisheye picture address storage section 14. On the other hand, a fisheye lens distortion factor storage section 15 stores a fisheye lens distortion factor corresponding to a memory data of each address in a picture data stored in the picture data memory 13. Then an optional area in the picture data picked up through fisheye lenses 18a, 18b is designated to apply the fisheye distortion correction for the picture data designation area based on the fisheye lens distortion factor corresponding to the designation area. Thus, the fisheye picture data picked up over a wide range is reproduced and displayed without distortion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electronic still camera equipped with a fisheye lens.

[Prior art and its problems] In general, when taking pictures using a fisheye lens, the subject can be photographed over a wide range, but the resulting image is distorted in accordance with the curvature of the fisheye lens.

In this case, with conventional cameras, it has not been possible to remove the distortion of images taken by the fisheye lens.

Therefore, conventionally, images taken using a fisheye lens, regardless of whether they are videos or photographs, can only be reproduced as images with unique distortions.

[Object of the Invention] The present invention was made in view of the above-mentioned problems, and provides an electronic still camera equipped with a fisheye lens that makes it possible to reproduce images without distortion even when shooting using a fisheye lens. The purpose is to provide

[Summary of the Invention] In other words, an electronic still camera equipped with a fisheye lens according to the present invention includes a photoelectric conversion device that converts image data formed through the fisheye lens into an electrical signal, and an image data that is converted into an electrical signal by the photoelectric conversion device. an image data storage means for storing distortion information of the image data passed through the fisheye lens, a fisheye distortion storage means for storing distortion information of the image data passed through the fisheye lens, and a fisheye correction means for correcting the image data stored by the image data storage means based on the distortion information. The apparatus includes an image correction means and a corrected image output means for outputting image data corrected by the correction means.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the electronic circuit. In the figure, 11 is a control section, and a key manual section 12 is connected to this control section 11. This key human power unit 12 operates in a predetermined area (
1 to 9), a region specification key for specifying each partial image, a correction specification key for specifying correction of distortion caused by the fisheye lens, and a command key for reproducing the photographed image, etc.
The control section 11 performs write/read operations for image data in the image data memory 13, readout operations for image data memory addresses in the fisheye image address storage section 14, and operations for specifying readout of image data memory addresses in the fisheye image address storage section 14, based on commands from the key human power section 12, and the fisheye lens distortion rate storage section 15. , the correction operation of fisheye photographed image data in the fisheye image correction circuit 16 , and the writing/reading operation of corrected image data in the corrected image memory 17 .

On the other hand, 18a and 18b are fisheye lenses, and optical image data obtained through the fisheye lenses 18a and 18b is imaged on an imager 21 via apertures 19a and 19b and a shutter 20 as captured image data. The imager 21 is composed of, for example, a CCD solid-state imaging device, and converts a formed optical image into an electrical signal, and the image data converted into the electrical signal is provided to the A/D converter 22. This A/D converter 22 is connected to the imager 2.
1 is converted into digital data according to the electric signal level of each individual pixel, and this digital image data from the A/D converter 22 is written into the image data memory 13. . In this case, as shown in FIGS. 2(A) and 2(B), the image data memory 13
The circular image data obtained through the fisheye lenses 18a and 18b is stored as digital data as is.

The digital image data stored in the image data memory 13 or the corrected image memory 17 is
The image data is converted into analog image data via the /A converter 23 and provided to the process circuit 24. This process circuit 24
converts the analog image data provided via the D/A converter 23 into a luminance signal Y and a color difference signal Cr (R-Y) (B
-Y)J, and the Y/C separated image signal from the process circuit 24 is converted into NTS C (National Te1evis
1on 5ysten+sCo■1tee) is created as a video signal and output and played.

Here, in the fisheye photographic image data stored in the image data memory 13, as shown in FIG. Memory addresses corresponding to each of these are stored in the fisheye image address storage section 14. On the other hand, the fisheye lens distortion rate storage section 15 stores the fisheye lens distortion rate corresponding to the memory data of each address of the image data stored in the image data memory 13. In other words, the fisheye image correction circuit 16 converts one area (any one of ■ to ■) of the image data stored in the image data memory 13 into an undistorted image based on the fisheye lens distortion rate corresponding to the memory area. Correct the data.

Next, the operation of reproducing captured images of the electronic still camera equipped with the fisheye lens configured as described above will be described.

FIG. 4 is a flowchart showing the image reproduction operation. Here, in the image data memory 13, the image data shown in FIG.
) As shown in FIG.
Aperture 19a.

19b→shutter 20→imager 21→A/D converter 22 and are stored as shown in FIG. 2(B).

That is, in order to reproduce the fisheye photographic image data stored in the image data memory 13, first, the key human power section 12 is
The user operates the reproduction command key (step Sl). here,
If the fisheye distortion is not corrected, the key human power section 12
Since the correction designation key is not operated, the image data stored in the image data memory 13 is sequentially read out in the entire area of memory data under address control by the control section 11 and given to the D/A conversion section 23 ( Step S2.S3). As a result, the fisheye-photographed image data "see FIG. 2 (B)" is converted into analog data by the A/D converter 23, and then passed through the process circuit 24 and encoder 25 to the fisheye image data as it is. N in imaging state
TSC bidet On the other hand, in order to correct fisheye distortion, after operating the reproduction command key of the key manual section 12, operate the correction designation key, and then use the area designation key to perform distortion correction. ~ ■ 1 area in (in this case ■
), the fisheye image address storage unit 14 is referred to, and the image data corresponding to the designated area as shown by ■ in FIG. (steps 31.32-34.S5). On the other hand, the fisheye lens distortion ratios corresponding to the memory addresses of the specified area (3) of the image pig are read out from the fisheye lens distortion ratio storage section 15 and sequentially provided to the fisheye image correction circuit 16 (step S6).

Here, in the fisheye image correction circuit 16, based on the fisheye lens distortion rate of the specified area ■ given from the fisheye lens distortion rate storage section 15, the specified area Corresponding fisheye image data correction processing is executed (step S
7). The image data without fisheye distortion after this correction processing is sequentially applied to and stored in the corrected image memory 17 (step S8). As a result, as shown in FIG. 5(A), the fisheye photographed image data corresponding to the designated area
After being converted into an analog signal by the D/A converter 23, the N'TSC signal is sent to the N'TSC via the process circuit 24 and the encoder 25.Meanwhile, in step S4, the third When the area ■ in the fisheye image data in the figure is specified, the process of steps 85 to S8 is performed in the same manner as described above, and the fisheye image corresponding to the specified area ■ is obtained as shown in FIG. 5(B). The image data is corrected to image data without fisheye distortion and stored in the image memory 17.
written to. Therefore, the corrected image data corresponding to this area (3) is transmitted to the D/A converter 23, the process circuit 24, and the encoder.Therefore, according to the electronic still camera equipped with the fisheye lens configured as described above, the corrected image data corresponds to the fisheye lens 18a.

Any area in the image data taken through 18b■
By specifying ~ ■, the fisheye distortion of the specified area of the image data can be corrected based on the fisheye lens distortion rate corresponding to this specified area, so it is possible to reproduce and display fisheye image data taken over a wide range without distortion. can.

[Effects of the Invention] As described above, according to the present invention, there is provided a photoelectric conversion means for converting image data imaged through a fisheye lens into an electric signal, and a memory for storing image data converted into an electric signal by the photoelectric conversion means. an image data storage means for storing distortion information of image data passed through the fisheye lens; and a fisheye distortion storage means for storing distortion information of the image data passed through the fisheye lens; , a fisheye image correction means for correcting the image data stored by the means based on the distortion information, and a corrected image output means for outputting the image data corrected by the correction means, so that a fisheye lens is not used. To provide an electronic still camera equipped with a fisheye lens that can produce 14 images without distortion even when photographing with a camera.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an electronic circuit of an electronic still camera with a biased fisheye lens according to an embodiment of the present invention;
FIGS. 2(A) and 2(B) are diagrams showing a fisheye photographed image taken by the electronic still camera and its image storage state, respectively;
3(A) to (1) are diagrams each showing divided correction areas of fisheye photographed image data, FIG. 4 is a flowchart showing the operation of reproducing a photographed image by the electronic still camera, and FIGS. 5(A) and ( B) is a diagram showing the state of fisheye image correction corresponding to designated areas (2) and (2), respectively, by the electronic still camera. 11...Control unit, 12...Key human power unit, 13...
Image data memory, 14...Fisheye image address fc!
Storage section, 15...Fisheye lens distortion rate storage section, 16...
Fisheye image correction circuit, 17...Correction image memory, 18a
. 18b...Fisheye lens, 19a, 19b...Aperture,
20...shutter, 21...imager, 22...
- A/D converter, 23... D/A converter, 24...
Process circuit, 5...encoder.

Claims (1)

[Claims] A fisheye lens, a photoelectric conversion means for converting image data formed through the fisheye lens into an electrical signal, an image data storage means for storing image data converted into an electrical signal by the photoelectric conversion means, and an image formed through the fisheye lens. fisheye distortion storage means for storing data distortion information, fisheye image correction means for correcting the image data stored by the image data storage means based on the distortion information, and image data corrected by the correction means. An electronic still camera equipped with a fisheye lens, characterized in that it is equipped with a corrected image output means for outputting a corrected image.