JPH06284424A - Simple supervisory equipment employing digital electronic camera - Google Patents

Abstract

PURPOSE:To obtain an easy to see display picture by measuring optical distortion of a fish-eye lens and controlling an address counter of a video memory so as to vary the phase of a video signal with respect to a synchronizing signal based on distortion data thereby correcting the distortion of an object. CONSTITUTION:An address counter 15A provides an output of address data in the image pickup recording state. An address conversion circuit 15B provides an output of addresses ADD19-ADD0 equivalent to addresses for correcting distortion of a fish-eye lens. The output signal is fed to addresses AA19-A0 of a video memory. On the other hand, a video signal from a CCD 4 is given via an A/D converter 7 to a signal processing circuit 8, in which R, G, B signals are generated. The data are sequentially written in the video memory 17 by using correction address data. In the reproduction state, the output signal from the address counter 15A is fed to the video memory 17. The video signal is sequentially read and a picture whose optical distortion is corrected is displayed on a monitor 25 via an A/D converter 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple monitoring device using a door scope and a digital electronic camera for correcting a distorted image of the door scope.

[0002]

2. Description of the Related Art In a conventional simple monitoring device using a door scope, a small TV camera is used to photograph the outside through a fisheye lens attached to the door, and the image is displayed on a home TV (Japanese Patent Laid-Open No. 59-59-59). 117882).

[0003]

However, in the prior art, when a subject is photographed through a fisheye lens, a distorted image is formed by the lens, which makes it difficult to see the image on the monitor and the subject cannot be discriminated.

Further, when the user is not watching TV because he / she is away, etc., there is a problem that the visitor is unknown, the requirement is not known, and the record is not recorded.

It is an object of the present invention to solve such problems and to provide a simple monitoring device capable of correcting a distorted image of a subject to realize a display image that is easy to see and recording subject information.

[0006]

According to the present invention, there is provided detection means for detecting a visitor, switch means for instructing start of photographing,
The fisheye lens is installed in the door to capture a visitor's image, and the digital electronic camera corrects a distorted image by the fisheye lens and records and outputs it to a monitor. Further, the digital electronic camera includes a memory control unit including an address counter for sending address data, an address conversion circuit for correcting an image at the time of writing, and a selector for switching between a correction address output at the time of writing and an address counter output. , Including a digital electronic camera that records and outputs the corrected image.

[0007]

According to the structure of the present invention, when the optical distortion of the fisheye lens is measured and the address counter of the video memory is controlled so as to change the phase with the synchronizing signal based on the data, the display timing of each pixel is changed. As a result, the positional relationship of the images is corrected, and the image with the image distortion corrected can be displayed.

Further, a sensor interface (S.I.F.) which receives an external signal by being connected to a visitor detecting means composed of a piezoelectric switch and an infrared sensor and a switch means for instructing the start of photographing such as a doorphone button. By attaching a detachable digital electronic camera to which a circuit and a circuit for compressing and recording voice are added to the door easily, a simple monitoring system with high reliability and good cost performance can be realized.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an example of a thin vertical electronic camera, in which a lens system 1 and a CCD 4 are arranged as shown in the figure, and a digital electronic camera (DESC) 31 is equipped with a liquid crystal display (LCD) 30 on its side surface. ing.

FIG. 2 shows an electronic camera 31 on the front door 35.
The state where is attached is shown. FIG. 2 (A) is a view of the camera as seen from above, in which the mirror 33 is arranged so that the optical axis of the door scope having the fisheye lens 29 attached to the entrance door 35 is bent at a right angle to enter the electronic camera 31. A built-in mirror case 32 is attached to the lens mount portion of the camera.

Here, the subject image is mirror-reflected by the mirror 33 so that it is horizontally inverted, but the horizontally-inverted image is converted into a correct image array by signal processing in the circuit of the electronic camera 31.

FIG. 2B is a side view of FIG. 2A, and the electronic camera 31 is set on the mounting adapter 34.

FIG. 3 shows an embodiment of a scene in which the camera is actually operated, and FIG. 4 is a circuit block diagram of the electronic camera 31. In the figure, when a visitor comes to the house when he / she is away from home, he stands in front of the front door 35 and pushes a door phone button 36 to inform the visitor.

At this time, when standing on the foot plate 38, its weight causes the piezoelectric switch set in the foot plate 38 to conduct, and in conjunction with this, the power of the electronic camera 31 is supplied from the AC adapter, and the camera shoots. Get ready.

Further, the infrared sensor 37 attached to the entrance door 35 operates, the infrared light emitting source irradiates the upper part of the visitor with infrared light, and the infrared sensor 37 detects the reflected light. This signal is input to the sensor interface circuit 18 of the camera, and the CPU 13 that controls the system detects this signal and recognizes the visitor.

As described above, in the combination system of the piezoelectric switch and the infrared sensor, for example, a dog or the like uses the foot plate 38.
The system does not malfunction even when you step on.

Next, when the doorphone button 36 is pressed, the signal is input to the sensor interface circuit 18 of the camera and the photographing is immediately started. When a visitor is filmed, the shooting time is recorded at the same time, and the family member can play it back after home and check it.

When a visitor makes a voice comment to the microphone 19 provided on an intercom, the voice data is converted into a digital signal by the A / D converter 21,
This signal is data-compressed on the time axis and recorded in the video memory 17. At the time of reproduction, compressed audio data is expanded from the video memory 17 on the time axis, converted into the original audio and reproduced.

As described above, the family member can easily confirm the visitor and the requirement for the visit by the image and the sound.

The specific circuit configuration is shown in FIG. The image of the subject formed by the lens 1 is converted into an electric signal by the CCD 4 through the iris 2 and the optical filter 3, the reset noise of the CCD 4 is removed by the CDS circuit 5, and the luminance characteristic of the monitor is matched by the gamma correction circuit 6. Gamma correction as follows. This signal is converted into a digital signal by the A / D conversion circuit 7, and this digital data is converted into a luminance signal and a color difference signal by the signal processing circuit 8. The memory control circuit 15 stores this signal in the video memory 17 and also in the memory card 16 at the same time. The CPU 13 controls the entire system, and controls the iris control circuit 9, the CCD drive circuit 10, the synchronization signal timing signal generation circuit 11 and the memory interface circuit (MIF) 14.

Here, as for the voice, the voice signal collected by the microphone 19 is amplified by the AMP 20, converted into a digital signal by the A / D conversion circuit 21, and the signal is compressed by the signal compression circuit 22, and then the video memory. Record at 17.

Next, a method of correcting the image distortion of the fisheye lens according to the present invention will be described. For example, when the lattice-shaped pattern shown in FIG. 5A is photographed, the distortion of the image is shown in FIG.
The grid lines bend like. More specifically, FIG.
The straight line of the lattice X'P 'and the straight line of Y'P' in (A) become the curve XP and the curve YP shown in FIG. 5B, respectively.

This distortion amount has a relationship shown in FIG. That is, if the fisheye lens has ideal characteristics and no distortion, the point P'in FIG. 5A is represented by P'in FIG. 5C. However, it moves to point P due to distortion. The amount of movement is only −ΔX (negative because it is the opposite direction to the X axis) from the point P in the X axis direction, and is shifted by ΔY (the same direction as the Y axis) in the Y axis direction. As described above, the optical characteristics of the fish-eye lens are obtained by photographing the regular lattice pattern of FIG. 5A, measuring the correction amount from the result to the ideal position (aberration-free) at each point, and obtaining the data. In order to display the image at the ideal position, when the captured video data is stored in the memory, the method of moving the address at the point P by the address corresponding to −ΔX and ΔY is adopted. If this address conversion is performed at the time of shooting and the data is written in the video memory, the distortion-corrected image can be reproduced in the subsequent reproduction.

FIG. 6 shows a circuit for actually executing this correction. In the memory control circuit 15, the address conversion circuit 1
Address data AD19-AD0 and ADD in 5B
The relationship with 19-ADD0 can be expressed by the conversion table shown in FIG. AD19-AD0 is 00000 (HEX) and ADD19-ADD0 is 00000
It is shown that it shows not the address value of (HEX) but an arbitrary address value A00000 corrected for distortion. That is, the optical distortion of the fisheye lens can be corrected by changing the data in the conversion table. The above address conversion is performed by the address conversion circuit 15B shown in FIG. In the shooting state, the address counter 15A sends the address data in a fixed phase relationship with the synchronization signal. In this photographing / recording mode, the output of the address counter 15A is A
It is represented by 20 signal lines of D19-AD0 and is added to the address conversion circuit 15B. The address conversion circuit 15B has a memory circuit configuration. If the circuit configuration is a memory that outputs 8-bit data to one address of the memory, in order to obtain 20-bit converted address data of ADD19-ADD0 ( 1M bit * 8 bit) * 3 memory configuration.

Therefore, when one of the addresses represented by AD19-AD0 is determined, one address data of the addresses corresponding to ADD19-ADD0 is output. That is, the corrected data is output.

The output of the address conversion circuit 15B becomes the output of the relation shown in the table table of AD19-AD0 to ADD19-ADD0 shown in FIG.

The operation of this circuit when displaying in the R, G, B component system will be described below. In the shooting / recording state, the address counter 15A sends the address data in a fixed phase relationship with the synchronization signal. The address conversion circuit 15B outputs address addresses ADD19-ADD0 corresponding to the addresses in which the distortion amount of the fisheye lens is corrected. This output signal is output from the A end to the C by the selector 15C.
Since it is connected to the end, the address A19 of the video memory
-Apply to A0. On the other hand, the video signal from CCD4 is A /
The D conversion circuit 7 converts the signal into a digital signal, and the signal processing circuit 8
Thus, R, G, B signals are generated from the signals corresponding to the color filters of the CCD 4. This data is sequentially written in the video memory with the above-mentioned correction address data.

When reproducing, the address counter 15
The output signal of A is selected from the B end to the C end by the selector 15C and applied to the address terminal of the video memory 17.
The video signals written in the video memory 17 are sequentially read, converted into R, G, B analog signals by the D / A conversion circuit 23, impedance-converted by the video amplifier 24, and optical image distortion is applied to the monitor 25. The corrected playback image is displayed.

[0029]

As described above, according to the simple monitoring device of the present invention, a visitor is recognized by an easy-to-see image in which image distortion is corrected by using a fisheye lens type doorscope which is permanently installed in a general home. it can.

Further, as a monitoring system, there is no mechanical drive part, the durability is high for continuous operation for a long time, maintenance and inspection are not required, and it is small and thin and does not take up much space for installation.

Further, as compared with the surveillance dedicated camera, when the electronic camera is not used such as when going out or at night, it is easily set on the door and utilized, so that the utilization efficiency of the camera can be improved and the cost performance can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a consumer electronic camera used in an embodiment of the present invention.

FIG. 2 is a diagram showing an installation state of an electronic camera attached to a front door.

FIG. 3 is a layout explanatory diagram of a monitoring device system according to an embodiment of the present invention.

FIG. 4 is a circuit block diagram of the electronic camera in the embodiment of the present invention.

FIG. 5 is a diagram for explaining an image distortion state of a fisheye lens and a distortion correction method.

FIG. 6 is a memory control circuit diagram for correcting image distortion of a fisheye lens.

FIG. 7 is a conversion table diagram showing a correspondence relationship of address data.

[Explanation of symbols]

 1 lens 4 CCD 5 CDS circuit 6 gamma correction circuit 7 A / D conversion circuit 8 signal processing circuit 13 CPU 15 memory control circuit 15A address counter 15B address conversion circuit 15C selector 17 video memory 18 sensor I.D. F circuit 24 Video amplifier 25 Monitor 30 LCD 31 Electronic camera 32 Mirror case 35 Entrance door 36 Doorphone button 37 Infrared sensor 38 Foot board

Claims (2)

[Claims] 1. A detection means for detecting a visitor, a switch means for instructing start of photographing, a fish-eye lens installed in a door for taking in a visitor image, and a digital electronic for correcting and recording and outputting a distorted image by the fish-eye lens. A simple monitoring device using a digital electronic camera, characterized by having a camera. 2. The digital electronic camera comprises a memory control means including an address counter for sending address data, an address conversion circuit for correcting an image at the time of writing, and a selector for switching a correction address output and an address counter output at the time of writing. The simple monitoring device using the digital electronic camera according to claim 1, further comprising: a recording device that records and outputs a corrected image.