WO2004073297A1

WO2004073297A1 - Dual image sensor photograph technique and device

Info

Publication number: WO2004073297A1
Application number: PCT/CN2004/000100
Authority: WO
Inventors: Paul Huang
Original assignee: Paul Huang
Priority date: 2003-02-12
Filing date: 2004-02-06
Publication date: 2004-08-26
Also published as: CN1522051A

Abstract

The present invention relates to a monitoring camera system used in low light conditions. A dual image sensor photograph technique adopts a color image sensor and a black/white image sensor at the same time, and a dual image sensor photograph device is composed of color and black/white image sensors and a complementary motor driven slip track. The photosensitive area of the color image sensor is covered with an infrared cut off filter. And the two image sensors are horizontally and tight fixed on a printed circuit board, both sides of which is connected to a position sensor by using a bolt. The motor driven slip track device is composed of slide rods, screws, gears and a motor. A visible light detector is located at the front of the dual image sensor photograph device. The present invention provides a camera which can capture clear images in low illumination conditions. When a 1/3 inch camera is used, the sensitivity is up to 0.01Lux/F1.2. With a low price and a simple structure, the photograph monitoring in low illumination conditions is cost effective.

Description

Double image sensor camera technology and device

Technical field

The present invention relates to the technical field of cameras, and in particular, to a surveillance camera system used in low-light conditions. Background technique

The camera technology has developed rapidly in recent years. Cameras have been widely used today. Large color cameras or systems for television media, home cameras, industrial cameras, especially surveillance camera devices, are also expanding their applications. They are used in artificial lighting conditions. High-quality images with clear images and rich colors can be obtained by shooting under the conditions of sufficient sunlight or daylight. It is difficult to obtain satisfactory camera quality at night or indoor low-light or low-light conditions. The low-light and low-light conditions are the focus of military, security, financial security, and other industry monitoring. Come to important topics researched by camera development professionals. 5LUX / F1. 2AGC0N work with higher performance at present, when the shooting period is less than 0.5LUX / F1.2, only black and white CCD camera can be selected, which can work in 0.5LUX / F1. 2 or less environment.

In today's increasingly demanding image quality, people want to see high-quality color images, and the higher the low-illumination performance, the better. The current solution is to use day and night cameras.

We know that before the color camera image sensor CCD / M0S has a cover filter to filter out infrared light, this guarantees reliable color reproduction, because CCD / CMOS can sense infrared light. If infrared light is used at night and the filter is removed using a mechanical device, performance can be improved. This is the basic principle of day and night camera. The illuminance can be increased to 0. 1-0. 2LUX / F1.2. '' Summary of the Invention

The purpose of the present invention is to provide a technical solution capable of capturing clear images under low and low light conditions, solving the problem of low-light camera quality at night, and enabling the camera or system to be widely used in military, security, and financial security applications. Its economical payment price and simple structure can make the cost-effectiveness of camera monitoring work in low and low light levels.

To achieve the above objective, the technical solution provided by the present invention is:

A dual image sensor camera technology and device thereof include a camera body, a lens, a visible light detection device, An image sensing system composed of an image sensing device, an electronic processing circuit and an input / output port, a. The image sensing device adopts a color image sensor and a black and white image sensor at the same time; b. The image sensor imaging device is a color image sensor The black and white image sensor and the supporting motor-driven slide rail device are composed of the color image sensor photosensitive area covered with an infrared cut-off filter. The surface height of the black and white image sensor is the same as the height of the filter covered on the color image sensor photosensitive area. The color image sensor It is horizontally and tightly mounted with a black and white image sensor on a printed circuit board, and a position sensor is connected to each of the left and right sides of the printed circuit board.

In the dual image sensor camera technology and its device, the motor-driven slide rail device is composed of a slide bar, a screw, a gear, and a motor, and a metal slide bar is arranged above the printed circuit board parallel to the upper edge of the printed circuit board. A ring arm is connected to both sides of the lower edge of the printed circuit board, and the upper ring arm is sleeved on the metal slide bar and is dynamically connected; there is a screw below the printed circuit board parallel to the lower edge of the printed circuit board, and the lower edge of the printed circuit board In the middle, a ring arm is pressed against the screw by a spring, and a gear is fixed at one end of the screw, and the gear meshes with the driving gear of the motor on one side of the camera; the two edges of the lower edge of the printed circuit board corresponding to the upper end are sleeved on the screw. Up, and connect dynamically.

In the dual image sensor camera technology and device, the visible light detection device is located in front of the dual image sensor device. The main body is a bracket, and a hole is opened in the bracket. The hole size is the same as that of the photosensitive area of the color image sensor and the black and white image sensor. The upper and lower surfaces of the hole are respectively connected with a photoresistor, and the surface of the photoresistor of the color photosensitive area image sensor is covered with an infrared cut filter.

In the dual image sensor camera technology and the device, the diameter of the outer tooth circle of the screw gear is slightly larger than the outer diameter of the ring arm on the screw, and the motor is located above the screw. The side of the motor that is not connected to the gear is processed by a flexible wire and electronically processed. The circuit board is connected near the lens.

In the dual image sensor camera technology and its device, the printed circuit board is connected to the bracket, and a flexible wire is connected to the side of the electronic processing circuit near the lens.

In the dual image sensor camera technology and its device, the bracket is fixed inside the camera body.

In the dual image sensor camera technology and the device thereof, both ends of the slider are fixed inside the camera body. In the dual image sensor camera technology and device, the upper and middle part of the rear end of the camera has a video output port, and the lower middle part has a power supply port. The video output port is connected to the side of the electronic processing circuit near the input and output port by a flexible wire. The power supply port is connected to the side of the electronic processing circuit near the input and output port by two flexible wires.

In the dual image sensor camera technology and device, the color image sensor is a high-performance 1 / 2-inch color image sensor, and the black-and-white image sensor is a high-performance 1 / 2-inch black-and-white image sensor. In the dual image sensor camera technology and its device, the hole is a rectangular hole, and the ratio of the length to the width of the rectangular hole is 4: 3.

The dual image sensor imaging technology and its device are characterized in that the imaging target surface of the lens is round, and the diameter of the round is larger than the diagonal of the rectangular hole.

The image sensors referred to in the present invention include CCD, CMOS, MOS, and the like. In the embodiment of the present invention, a color CCD and a monochrome CCD are used.

The gist of the present invention is to use a dual image sensor, that is, a color image sensor and a black and white image sensor.

The technical principle is briefly described as follows:

High-performance color image sensors work above 0.5 Lux Lux. When the ambient illumination is lower than

The image becomes dim at 0.5Lux (when using a lens around F1.2). For a simple black and white camera system, the working illuminance can reach the level of 0.03 Lux (also when using a lens of about F1.2), because each pixel of a single-color image sensor is composed of three primary colors, and the micro-lens is focused on the grating. Three colors were separated. The black-and-white sensor pixels are pure brightness signal elements, but the area of the photosensitive target is the same. Therefore, the area of each pixel of a black and white sensor is larger than the area of a single pixel of a color sensor, and there is no light loss of the grating, so its low illumination performance is much better than that of a color sensor. Beneficial effect

The idea of the present invention is to combine the advantages of color and black-and-white photography. The camera automatically switches the image sensor according to the intensity of the light, so that it can see high-quality color images during the day, and it is also clear when using the black and white image sensor at low-light environment at night. Ground-resolved images with illuminance greater than 0.02LUX. As a surveillance camera, the improvement of sharpness under low-light conditions is the most important indicator. The imaging device of the present invention achieves a better index.

The dual image sensor camera system of the present invention can increase the illuminance to 0.202LUX / F1.2 (up to 0.000004LUX / 1.2 if a slow shutter speed is used), because it combines the high-quality color images of a color camera and Low illumination performance of black and white cameras. The color image sensor is used to capture color images during the day, and the black and white image sensor is used to capture high quality black and white images at low illumination at night, and these conversions are all done automatically by the camera. Its cost is lower than high-performance color cameras (for example, the price of high-performance color CCD is higher than that of ordinary color CCD plus high-performance monochrome CCD).

The embodiment of the present invention adopts a 1 / 3-hour camera with respect to the embodiment in which the ordinary camera improves sharpness in a low-light environment, and its economic index is also excellent. Original ICX249AK color CCD with 1/2 time SONYExviewPal system Its performance is 0.61 ux / Fl. 2, the price is USD 65. 00; 1 / 2-inch S0NYExviewICX249AL black and white CCD, the sensitivity can be less than 10_ ³ , the price is USD 60. 00 yuan. The 1 / 3-inch SONYSUPER-HAD color north CCD used in the present invention is also a PAL system ICX409AK, the price is USD 22.00 yuan; the 1 / 3-inch SONYExview-HAD, ICX255AL black and white CCD is USD 20.00 yuan. Using this type of CCD in the embodiment of the present invention, the sensitivity reached 0.005 ~ 0. 01LUX / F1.2, and its low price and excellent cost performance with improved sensitivity are obvious.

The camera device (system) of the present invention is developed based on the above-mentioned principle. The technical solution is practical and feasible. The low-light camera effect is remarkable, and the performance-price ratio is excellent. It is very suitable for monitoring camera. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a camera according to the present invention;

2 is a schematic structural diagram of a dual image sensor according to the present invention;

3 is a schematic structural diagram of a visible light detection device;

FIG. 4 is a schematic diagram of the connection between the circuit board and the electronic processing circuit board of the present invention. Detailed ways

FIG. 1 shows the positions of the dual image sensor device and the visible light detection device in the camera of the present invention. The front end of the camera 1 is equipped with a lens 2, a visible light detection device 3 is installed behind the lens 2 installation portion, a dual image sensor device 4 is installed behind the visible light detection device 3, and a matching motor-driven slide rail device and a dual image sensor device 4 are installed As one. The dual image sensor device 4 is closely mounted on the printed circuit board 20, and the printed circuit board 20 and the main circuit board, that is, the electronic processing circuit board 5 are connected by a flexible wire, and the video signal of the electronic processing circuit board 5 is connected to the upper part of the rear end of the camera 1. The video output port 6 is powered from the power supply port 7 to the electronic processing circuit board 5.

Fig. 2 shows the structure of the dual image sensor 4 and the supporting motor-driven sheave rail device. The image sensor used in the embodiment of the present invention uses a CCD sensor, which is hereinafter referred to as a color CCD and a monochrome CCD.

The dual image sensor device 4 is composed of a color CCD12 and a black-and-white CCD17. The color CCD12 and the black-and-white CCD17 are horizontally and closely mounted on a printed circuit board 20. A metal slide bar 14 is provided above the printed circuit board 20 parallel to the upper edge of the board. The two ends of the slide bar 14 are fixed in the camera with screws, and the upper and lower ends of the printed circuit board 20 are provided with a ring arm 21 on each side of the upper and lower sides. The holes on the upper end ring arm 21 are fitted on the metal slide bar 14 and are dynamically connected; A screw 18 is arranged below the circuit board 20 parallel to the lower edge of the board, and the printed circuit board 20 The middle of the lower end is pressed by a spring to the lower end ring arm 19 on the screw 18. The plastic ring arm 19 is made of low-elastic plastic. When the screw 18 rotates, the screw of the screw 18 generates a helical thrust on the plastic ring arm 19. This pushes the plastic ring arm 19 to the left or right, because the printed circuit board 20 is tightly connected to the spring, the movement of the plastic ring arm 19 drives the circuit board 20 and the color CCD12 and black and white CCD17 installed thereon; the printed circuit The hole on the annular arm 21 at the edge of the lower end of the plate 20 is sleeved on the screw 18 and is dynamically connected; one end of the screw 18 is fixed in the middle hole of the gear 16, and the gear 16 is engaged with the driving wheel of the motor 15 on the side of the camera. Each of the left and right sides of the printed circuit board 20 is connected to a position sensor 13 by screws. The printed circuit board 20 moves according to the signal of the position sensor 13, and the surface roughness of the black and white image sensor 17 and the color filter 12 cover the photosensitive area. The light sheet has the same height. The diameter of the external tooth circle of the gear 16 is slightly larger than the outer diameter of the plastic arm 19 on the screw 18. The motor 15 is located above the screw 18, and the motor 15 Side surfaces connected by a gear connected to a side close to the lens of a flexible wire 5 and the electronic processing circuit board.

The visible light detection device 3 shown in FIG. 3 is located in front of the dual image sensor device 4 and at the rear end of the lens 2. The main body of the visible light detection device 3 is a bracket. The bracket 31 is fixed inside the body of the camera 1 with screws, and is opened on the bracket 31. There is a rectangular hole 10 with a length to width ratio of 4: 3. The size is the same as the area of the photosensitive area of the color image sensor 12 and the black and white image sensor 17. The imaging target surface 9 of the lens is circular. The diameter of the figure is slightly larger than the rectangle. The diagonal of the hole 10, the upper and lower surfaces of the rectangular hole 10 are connected with a photoresistor 8, 11 respectively by a screw, and the surface of the color image sensor 12 photosensitive area photoresistor 11 is covered with an infrared cut-off filter. Note the serial number).

FIG. 4 shows the connection relationship of the camera circuit. Since the embodiment of the present invention is based on the use of the existing circuit board and electronic processing circuit board of a 1 / 3-inch camera, it is appropriately changed according to the structural characteristics of the embodiment. The circuit will be described with reference to the drawings Connection relationship.

The power supply port 7 of the electronic processing circuit board 5 is connected to a power source, and the other port is an output video signal port 6. The sensing signal of the visible light detection device 3 is transmitted to the electronic processing circuit board 5, and one position is provided on each side of the printed circuit board 20. The sensor 13 transmits the position signal to the electronic processing circuit board 5. The power of the motor 15 is input by the electronic processing circuit board 5. The electronic processing circuit board 5 is connected to the printed circuit board 20 by a plurality of lines, including transmitting the CCD photosensitive signal, Drive CCD power supply, etc.

Since the main board (electronic processing circuit board) of the camera circuit board is a conventional circuit, the added circuit connection in the circuit of this embodiment is simple and clear, and will not be described in detail here.

The circuit relationship of the camera of the present invention during operation will be briefly described.

The visible light detecting device 3 outputs an analog electric signal for converting the intensity of visible light and sends it to a voltage comparison circuit. The threshold value of the circuit is adjustable, and the light intensity is reduced to a certain degree. The voltage comparison circuit is reversed. The reverse signal drives the relay to connect the motor power, the motor rotates, and with the assistance of the position sensor 13, it drives the dual image camera device to move black and white. The CCD17 is centered on the imaging target surface 9 and the voltage comparison circuit inverts the signal to turn off the color CCD12 circuit. At the same time, the black-and-white CCD17 circuit is started. At this time, the entire camera system is switched to black-and-white mode. When the visible detection device 3 detects The light intensity is increased to a certain degree, the voltage comparison circuit is inverted again, the inverted signal drives the relay, the motor action drives the circuit board 20 to move the black and white CCD17 out of the target surface 9, the center of the color CCD12 is aligned with the imaging target surface 9, with the assistance of the position sensor 13. At the same time, the color CCD12 circuit is turned on and the black and white CCD17 circuit is turned off. At this time, the camera system is switched to the color mode to work.

Claims

Claim

1. A dual image sensor camera technology and device thereof, a camera system consisting of a camera body, a lens, a visible light detection device, an image sensing device, an electronic processing circuit, and an input / output port, characterized in that, a, the image The sensing device uses both a color image sensor and a black-and-white image sensor; b. The image sensor camera device is composed of a color image sensor, a black-and-white image sensor, and a supporting motor-driven slide rail device, and the photosensitive area of the color image sensor covers an infrared cut-off filter. Light sheet, the height of the surface of the black and white image sensor is the same as the height of the filter covering the photosensitive area of the color image sensor. The color image sensor and the black and white image sensor are horizontally and tightly mounted on the printed circuit board. The left and right sides of the printed circuit board are connected to each other. A position sensor.

2. The dual image sensor camera technology and device according to claim 1, wherein the motor-driven slide rail device is composed of a slide bar, a screw, a gear, and a motor, and the top of the printed circuit board is parallel to the printed circuit board. A metal slide bar is provided on the upper edge, and a ring arm is connected to both sides of the upper and lower edges of the printed circuit board. The upper ring arm is sleeved on the metal slide bar and is dynamically connected. The lower edge of the printed circuit board is parallel to the lower edge of the printed circuit board. A screw, the middle of the lower edge of the printed circuit board is pressed by a ring arm against the screw by a spring, and a gear is fixed at one end of the screw, and the gear meshes with the driving gear of the motor on one side of the camera; the lower edge of the printed circuit board corresponds to The upper two ring arms are sleeved on the screw and are dynamically connected.

3. The dual image sensor camera technology and device according to claim 1, wherein the visible light detection device is located before the dual image sensor device, and the main body is a bracket, and a hole is formed in the bracket, and the hole size and the color image sensor The area of the photosensitive area of the black and white image sensor is the same. A photoresistor is connected to the upper and lower surfaces of the hole, and the surface of the photoresistor of the color photosensitive area image sensor is covered with an infrared cut filter.

4. The dual image sensor camera technology and device according to claim 1, wherein the diameter of the outer tooth circle of the screw gear is slightly larger than the outer diameter of the ring arm on the screw, the motor is located above the screw, and the motor is not connected to the gear A flexible wire is connected to the side of the electronic processing circuit board near the lens.

5. The dual image sensor camera technology and device thereof according to claim 1, wherein the printed circuit board is connected to the bracket, and a flexible wire is connected to the side of the electronic processing circuit near the lens.

6. The dual image sensor camera technology and device according to claim 5, wherein the bracket is fixed inside the camera body.

7. The dual image sensor camera technology and device thereof according to claim 2, wherein both ends of the slider are fixed inside the camera body.

8. The dual image sensor camera technology and device according to claim 1, wherein the upper and middle part of the rear end of the camera has a video output port, and the lower middle part has a power supply port, and the video output port consists of a flexible wire and an electronic processing circuit. The side close to the input / output port is connected, and the power supply port is connected to the side of the electronic processing circuit near the input / output port by two flexible wires.

9. The dual image sensor camera technology and device according to claim 1, wherein the color image sensor is a high-performance 1 / 2-inch color image sensor, and the black-and-white image sensor is a high-performance 1 / 2-inch black-and-white image sensor.

10. The dual image sensor camera technology and device according to claim 3, wherein the hole is a rectangular hole, and the ratio of the length to the width of the rectangular hole is 4: 3.

11. The dual image sensor imaging technology and device thereof according to claim 1 or 10, wherein the imaging target surface of the lens is circular, and the diameter of the circular shape is larger than the diagonal of the rectangular hole.