CN104967775B - A kind of device and method of zoom lens imaging - Google Patents

Abstract

The invention relates to an imaging device and method with a zoom lens. The device includes at least two zoom imaging units, the focal lengths of each zoom imaging unit increase sequentially, and the focal lengths of two adjacent zoom imaging units partially overlap; a channel selector connected with the zoom imaging unit is used to select at least one zoom imaging unit The signal input by the unit is used as its output; the control unit is connected to the zoom imaging unit and the channel selector respectively; The focal lengths between the two zoom imaging units overlap sequentially, and the channel selector is also controlled to sequentially switch from the current imaging zoom imaging unit as the signal input end to the next imaging zoom imaging unit as the signal input end. The device and method can reduce the attenuation effect of the wide-range focal length zoom lens on the ambient illuminance.

Description

Apparatus and method for zoom lens imaging

technical field

The present invention relates to a video imaging device, and more specifically, to a zoom lens imaging device and method.

Background technique

Data analysis by the public security department shows that illegal and criminal acts usually occur in areas with low illumination and poor lighting conditions. In terms of crime time, more crimes were committed at night than during the day, accounting for 79.1%. Therefore, after the video image imaging device (hereinafter referred to as the camera) enters the field of public security monitoring, the minimum illumination condition (hereinafter referred to as the low-illuminance performance) of the camera that can meet the basic imaging index has become the goal pursued by users. At the same time, in order to improve the use efficiency of the camera, the maximum range that the camera can see from near to far (hereinafter referred to as coverage) has also become the focus of attention of users.

The coverage of the camera is related to the focal length of the lens. When the focal length of the lens (commonly known as the small f-number of the lens) changes from short to long (for example, from 4mm to 80mm), the range that the camera can see changes from near to far, and the coverage increases. bigger and bigger. Cameras usually have a larger coverage by configuring a continuous zoom lens.

The low-light performance of the camera is related to the focal ratio of the lens (the ratio of the focal length to the light aperture, generally speaking, the lens has a large F number), and the performance of the image sensor. For an image sensor with specific performance, when the focal ratio of the lens changes from large to small (for example, from F5.0 to F1.0), the clear aperture changes from small to large, and the low-light performance of the camera becomes better and better.

In addition, the image processor necessary for the camera can also improve the low-light performance of the camera to a certain extent.

A camera with a zoom lens consists of a zoom lens, an image sensor, and an image signal processor.

With the continuous advancement of semiconductor technology, the performance of image sensors has been continuously improved. At present, when using an F1.4 lens and an image processor, it can clearly image images in a low-light environment of 0.08lux (according to the environmental illuminance classification standard) , 0.01lux is moonlight level).

However, limited by lens design ideas and technological conditions, cameras with continuous zoom lenses cannot fully demonstrate the existing performance of image sensors.

Currently, the design concept of a video image imaging device is to use a continuous zoom lens to provide the entire focal length range that needs to be used, for example, to use a continuous zoom lens with a focal length range of 4 mm to 132 mm. In this case, the ratio of the long focal length to the short focal length of the lens is 132mm/4mm=33. With the existing technical conditions, it is impossible to ensure that the lens has the same small focal ratio at the long focal length and short focal length (for example, F1.0), it can only change the focal ratio from F1.6 to F5.0 when the focal length of the lens changes from 4mm to 132mm.

At this time, assuming that the external environment illumination is 100%, the amount of light entering the lens at the short focal point of 4mm is 1/(1.6*1.6)=39%, and the amount of light entering at the telephoto point of 132mm is 1/(3.6*3.6)=4 %. This means that in order for a sensor capable of imaging under 0.08lux ambient illuminance to image at a telephoto, the ambient illuminance cannot be lower than 0.08Lux/4%=2lux. In other words, when the ambient illuminance is 0.08lux and the focal length of the lens is 132mm, the illuminance transmitted to the image sensor is only 0.08*4%=0.0032Lux, which is far below the minimum imaging illuminance requirement of the image sensor, resulting in no image being seen.

From the above example calculations, it can be seen that the attenuation effect of the large focal ratio at the long focal length on the ambient light is quite significant, which greatly affects the performance of the existing performance of the sensor. This directly leads to the fact that in areas with low illumination and poor lighting conditions, the camera may not be able to see any images, and loses the meaning of video image monitoring.

In order to reduce this attenuation effect, the compensation methods usually adopted are as follows:

1. Use visible light or infrared light to supplement the light to increase the ambient illumination; this method exposes the position of the camera and the direction and range of observation, so that the concealment of the camera no longer exists. The safety monitoring of sensitive areas loses its original function.

2. Adopt subversive sensor technology, such as EMCCD, to improve the sensitivity of the sensor by hundreds or even thousands of times, so that the attenuation effect of the lens on the ambient illuminance can be ignored. However, this method increases the cost of the camera by thousands of times, far exceeding the sum of the cost of the lens and the camera under the existing technological conditions. It cannot be promoted and used on a large scale;

3. Continue to improve the existing sensors, and appropriately increase the sensitivity of the sensors; this improvement is slow, usually after many years to improve by two or three times.

Although the above-mentioned various compensation methods have their own advantages and disadvantages, they have not fundamentally solved the problem of attenuation of ambient illumination by the continuous zoom lens, and the existing performance of the image sensor has not been fully reflected at the telephoto point of the lens.

Contents of the invention

The technical problem to be solved by the present invention is to provide a zoom lens imaging device and method, so that the attenuation effect of the zoom lens on the ambient illuminance can be reduced under the zoom lens with a wide focal length.

The technical solution adopted by the present invention to solve its technical problem is: construct a kind of zoom lens imaging device, comprising,

At least two zoom imaging units, the focal lengths of each zoom imaging unit increase sequentially, and the focal lengths of two adjacent zoom imaging units partially overlap;

A channel selector connected to the at least two zoom imaging units, used to select at least one signal input by the zoom imaging unit as its output;

a control unit communicatively connected to the zoom imaging unit and the channel selector;

The control unit is used to control the zoom imaging unit for current imaging, the zoom imaging unit for imaging at the next moment, and the focal length between the zoom imaging unit for imaging at the current moment and the zoom imaging unit for imaging at the next moment. The focal lengths between the two zoom imaging units overlap sequentially, and the channel selector is also controlled to sequentially switch from the current imaging zoom imaging unit as a signal input end to the next imaging zoom imaging unit as a signal input end.

Preferably, the zoom imaging unit includes a zoom lens and an image sensor,

The zoom lens is used to obtain optical imaging of video/image, wherein the focal lengths of the zoom lenses corresponding to each of the zoom imaging units are sequentially increased, and the focal lengths of two adjacent zoom lenses partially overlap;

The image sensor, connected to the zoom lens, is used to receive the optical imaging of the video/image of the zoom lens and convert it into an initial video/image electrical signal for output.

Preferably, the zoom lens imaging device also includes an image processor,

The image processor, connected to the image sensor and the channel selector, is used to receive the initial video/image electrical signal output by the image sensor and convert it into a video image conforming to the set video/image standard signal output;

Alternatively, the image processor is connected to the channel selector, and is used to receive the initial video/image electrical signal from the channel selector and convert it into a video image signal that conforms to the set video/image standard for output .

Preferably, the ratio of the telephoto to short focal length of the zoom lens is in the range of 1-5.

Preferably, the control unit includes a zoom imaging control unit and a channel selector control unit,

The zoom imaging control unit is connected with the zoom imaging unit and the channel selector control unit, and is used to control the zoom imaging unit for the current imaging and the zoom imaging unit for imaging at the next moment, and the zoom imaging unit located in the The focal lengths between the zoom imaging units of the current imaging zoom imaging unit and the focal lengths of the zoom imaging unit imaging at the next moment coincide in turn, and a selection control signal is also output to the channel selector control unit to control The channel selector control unit selects the zoom imaging unit that is currently imaging as the signal input terminal and sequentially switches to the zoom imaging unit that is imaging at the next moment as the signal input terminal;

The channel selector control unit is connected with the zoom imaging control unit and the channel selector, and is used to receive a selection control signal from the zoom imaging control unit to control the channel selector to select the channel selected by the current channel selector. The signal input end of the zoom imaging unit for imaging is sequentially switched to the signal input end of the zoom imaging unit for imaging at the next moment.

Preferably, the focal ratio of the zoom lens is less than or equal to F2.8.

Preferably, the focal ratios of different zoom lenses in the zoom lens imaging device are the same or different.

The present invention also provides an imaging method of a zoom lens, comprising the following steps:

A. Judging whether the focal length of the current zoom imaging unit corresponding to the signal input terminal selected by the channel selector overlaps with the zoom imaging unit for imaging at the next moment, if not, then perform step B, and if so, then perform step C;

B. Adjust the focal length of the intermediate zoom imaging unit that overlaps with the focal length of the current imaging zoom imaging unit and the focal length is located between the current imaging zoom imaging unit and the next imaging zoom imaging unit, and the current imaging The focal length of the zoom imaging unit, so that the focal length of the intermediate zoom imaging unit coincides with the focal length of the zoom imaging unit imaging at the current moment, and at the same time control the channel selector to select the intermediate zoom imaging unit as a signal input end, return to step A;

C. Adjust the focal length of the zoom imaging unit of the current imaging to coincide with the focal length of the zoom imaging unit of the imaging at the next moment, and the control unit controls the channel selector to select the zoom imaging unit of the imaging at the next moment as the signal input terminal .

Preferably, the imaging method of the zoom lens also includes the following steps:

Obtain optical imaging of video/image through zoom lens;

The image sensor obtains the optical imaging of the video/image, converts it into an initial video/image electrical signal, and outputs it to the image processor;

The image processor acquires the initial video/image electrical signal and converts it into a video image signal conforming to a set video/image standard for output.

Preferably, the ratio of the telephoto to short focal length of the zoom lens is in the range of 1-5.

Implementing the zoom lens imaging device and method of the present invention has the following beneficial effects: use at least two or more zoom imaging units to shoot video or images, the focal lengths of the zoom imaging units increase sequentially, and the focal lengths of two adjacent zoom imaging units There is a partial overlap, thereby ensuring that the overall focal length range of the zoom lens imaging device is large enough, and the ratio of the long focal length to the short focal length of each zoom imaging unit is small, so that each zoom imaging unit can have Small focal ratio, thereby reducing the attenuation of ambient light. The control unit controls the focal length between the zoom imaging unit currently imaging and the zoom imaging unit imaging at the next moment, and the zoom imaging unit located between the focal lengths of the zoom imaging unit currently imaging and the zoom imaging unit imaging at the next moment Sequential overlap, also control the channel selector to switch from the current imaging zoom imaging unit as the signal input end to the next imaging zoom imaging unit as the signal input end, so that the channel selector can be used between different zoom imaging units Switching, according to actual needs, select the zoom imaging unit corresponding to the required focal length to shoot video or image output, so that the focal length range of the zoom imaging unit can be increased without increasing the attenuation of the zoom lens, that is, zoom imaging in a wide range of focal lengths Reduce the attenuation effect of the zoom lens on the ambient illumination under the unit.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic structural view of the first embodiment of the device for zoom lens imaging of the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of the zoom lens imaging device of the present invention.

detailed description

The zoom lens imaging device of the present invention includes at least two zoom imaging units, a channel selector, and a control unit.

The focal lengths of each zoom imaging unit increase sequentially, and the focal lengths of two adjacent zoom imaging units partially overlap.

The channel selector is connected with at least two zoom imaging units, and is used to select the input signal of at least one zoom imaging unit as its output.

The control unit communicates with the zoom imaging unit and the channel selector respectively. The control unit is used to control the zoom imaging unit for current imaging, the zoom imaging unit for imaging at the next moment, and the pair of zoom imaging units located between the focal lengths of the zoom imaging unit for current imaging and the zoom imaging unit for imaging at the next moment The focal lengths between them overlap sequentially, and the channel selector is also controlled to sequentially switch from the current imaging zoom imaging unit as the signal input end to the next imaging zoom imaging unit as the signal input end.

The zoom imaging unit includes a zoom lens and an image sensor. The zoom lens is used to obtain video/image optical imaging, wherein the focal lengths of the zoom lenses corresponding to each zoom imaging unit increase sequentially, and the focal lengths of two adjacent zoom lenses partially overlap. The image sensor is connected with the zoom lens, and is used to receive the optical imaging of the video/image of the zoom lens and convert it into an initial video/image electrical signal for output. Among them, the ratio of the telephoto lens to the short lens lens ranges from 1 to 5; the focal ratio of the zoom lens is less than or equal to F2.8. The focal ratios of different zoom lenses in the zoom lens imaging device are the same or different.

The imaging device with zoom lens also includes an image processor. The image processor is connected with the image sensor and the channel selector, and is used for receiving the initial video/image electrical signal output by the image sensor and converting it into a video image signal output conforming to the set video image standard. Or the image processor is connected with the channel selector for receiving the original video/image electrical signal from the channel selector and converting it into a video image signal conforming to the set video image standard for output.

The control unit includes a zoom imaging control unit and a channel selector control unit. The zoom imaging control unit is connected with the zoom imaging unit and the channel selector control unit, and is used to control the zoom imaging unit for current imaging and the zoom imaging unit for imaging at the next moment, and the zoom imaging unit for imaging at the current moment and the zoom imaging unit for imaging at the next moment. The focal lengths between the zoom imaging units between the focal lengths of the imaging units coincide in turn, and a selection control signal is output to the channel selector control unit to control the channel selector control unit to select the current imaging zoom imaging unit as a signal input The terminal is sequentially switched to the zoom imaging unit for imaging at the next moment as the signal input terminal.

The channel selector control unit is connected with the zoom imaging control unit and the channel selector, and is used to receive the selection control signal from the zoom imaging control unit, so as to control the channel selector to select the current imaging zoom imaging unit as the signal input terminal to switch to The zoom imaging unit for imaging at the next moment is used as a signal input terminal.

In the first embodiment of the zoom lens imaging device of the present invention, the zoom lens imaging device includes at least two zoom imaging units, and in this embodiment there are three zoom imaging units, for example, the first zoom imaging unit 11, the second zoom imaging unit The second zoom imaging unit 12 and the third zoom imaging unit 13 , the zoom lens imaging device further includes a channel selector 2 and a control unit 3 .

The focal lengths of the first, second and third zoom imaging units 11, 12, 13 are sequentially increased, and the focal lengths of the adjacent first zoom imaging unit 11 and the second zoom imaging unit 12 partially overlap, and the second zoom imaging unit 12 partially overlaps with the focal length of the third zoom imaging unit 13. The first, second, and third zoom imaging units 11, 12, and 13 respectively include first, second, and third zoom lenses 111, 121, and 131, first, second, and third image sensors 112, 122, and 132, and first, and third 2. The third image processor 113, 123, 133. The first zoom lens 111, the first image sensor 112 and the first image processor 113 are connected in sequence, the second zoom lens 121, the second image sensor 122 and the second image processor 123 are connected in sequence, the third zoom lens 131, the third The image sensor 132 and the third image processor 133 are connected in sequence.

The first, second and third zoom lenses 111, 121, 131 are used to obtain optical imaging of videos/images, wherein the focal lengths of the first, second and third zoom lenses 111, 121, 131 are successively increased, and the first and second zoom lenses 111, 121 The focal lengths between them partially overlap, and the focal lengths between the second and third zoom lenses 121 and 131 partially overlap. The first, second and third zoom lenses 111, 121, 131 have a ratio range of telephoto to short focal length of 1-5, and the focal ratio is less than or equal to F2.8, and the focal ratios of the first, second and third zoom lenses 111, 121, 131 are the same or Are not the same.

The focal length of the first zoom lens 111 is 4-15 mm, the focal length of the second zoom lens 121 is 14 mm-48 mm, and the focal length of the third zoom lens 131 is 44 mm-132 mm. Here, increasing the focal length of the zoom lens means that the short focal length and the long focal length of the focal length are correspondingly increased.

The first, second, and third image sensors 112, 122, and 132 are connected to the corresponding first, second, and third zoom lenses 111, 121, and 131 for obtaining optical imaging of the corresponding first, second, and third zoom lenses 111, 121, and 131 And converted to the original video/image electrical signal output.

The first, second, and third image processors 113, 123, and 133 are used to receive the initial video/image electrical signals corresponding to the output of the first, second, and third image sensors 112, 122, and 132 and convert them into video images that meet the set video/image standards signal output.

The channel selector 2 is connected to the corresponding first, second, and third image processors 113, 123, and 133 in the first, second, and third zoom imaging units 11, 12, and 13 for selecting the first, second, and third images The signal input by at least one of the processors 113, 123, 133 is used as its output. According to actual needs, the channel selector 2 can simultaneously select the corresponding first, second, and third zoom imaging units 11, 12, and 13. A plurality of input signals in the third image processor 113, 123, 133 is output as its output.

The control unit 3 is communicatively connected with the first, second and third zoom imaging units 11 , 12 , 13 and the channel selector 2 respectively. The control unit 3 is used to control the zoom imaging unit for current imaging, the zoom imaging unit for imaging at the next moment, and the two zoom imaging units located between the focal lengths of the zoom imaging unit for current imaging and the zoom imaging unit for imaging at the next moment The focal lengths between them overlap sequentially, and the channel selector is also controlled to sequentially switch from the current imaging zoom imaging unit as the signal input end to the next imaging zoom imaging unit as the signal input end.

The control unit 3 includes a zoom imaging control unit 31 and a channel selector control unit 32 .

The zoom imaging control unit 31 is connected with the first, second and third zoom imaging units 11, 12, 13, and is connected with the channel selector control unit 32, for controlling the zoom imaging unit of current imaging and the imaging of the next moment. The focal lengths between the zoom imaging unit and the zoom imaging unit located between the focal lengths of the zoom imaging unit currently imaging and the zoom imaging unit imaging at the next moment are sequentially overlapped, and a selection control signal is also output to the channel selector control unit 32 , by controlling the channel selector 2 to select the signal input end of the current imaging zoom imaging unit as the signal input end to be sequentially switched to the next imaging zoom imaging unit.

The channel selector control unit 32 is connected with the zoom imaging control unit 31 and the channel selector 2, and is used to receive the selection control signal from the zoom imaging control unit 31, so as to control the channel selector 2 to select the current imaging zoom imaging unit as the signal The input end is sequentially switched to the zoom imaging unit for imaging at the next moment as the signal input end.

The working process of the zoom lens imaging device is as follows:

At present, the zoom lens imaging device needs to shoot a video/image at a focal length of 4mm, then the zoom imaging control unit 31 controls the first zoom lens 111 to perform video/image optical imaging, and the first image sensor 112 acquires the optical imaging and converts it into an initial The video/image electrical signal is output to the first image processor 113, and the first image processor 113 receives the initial video/image electrical signal and converts it into a video image signal conforming to the set video/image standard for output. The channel selector control unit 32 controls the channel selector 2 to use the first image processor 113 in the first zoom imaging unit 11 as a signal input terminal, receive and output the video image signal output by the first image processor 113 .

If the zoom lens imaging device needs to take video/image at the position of 30mm focal length at the next moment, then the zoom imaging control unit 31 controls the first zoom lens 111 to zoom to the corresponding long focal length of 15mm, and controls the second zoom lens 121 to zoom to the short focal length at the same time. Zooming at a focal length of 14 mm, when the focal lengths of the first zoom lens 111 and the second zoom lens 121 overlap, the channel selector control unit 32 controls the channel selector 2 to select the second image processor 123 as the signal input terminal, and simultaneously controls the second zoom The lens 112 adjusts the focal length to the position of 30mm for video/image optical imaging, the second image sensor 122 acquires the optical imaging and converts the initial video/image electrical signal to the second image processor 123, and the second image processor 123 will receive The initial video/image electrical signal is converted into a video image signal conforming to the set video image standard for output, and the channel selector 2 selects and receives the video image signal output by the second image processor 123 .

If the zoom lens imaging device needs to shoot video/image at the position of 130mm focal length at the next moment, after the channel selector 2 selects the second image processor 123 as the signal input terminal according to the above-mentioned process, the zoom imaging control unit 31 controls the second The zoom lens 121 zooms to the corresponding long focal length of 48 mm, and simultaneously controls the third zoom lens 131 to zoom to the short focal length of 44 mm. When the focal lengths of the second zoom lens 121 and the third zoom lens 131 overlap, the channel selector control unit 32 controls the channel The selector 2 selects the third image processor 133 as the signal input terminal, and simultaneously controls the third zoom lens 132 to adjust the focal length to a position of 130 mm for video/image optical imaging, and the third image sensor 132 obtains the optical imaging and converts it into an initial video The electrical/image signal is output to the third image processor 133, and the third image processor 133 will receive the initial video/image electrical signal and convert it into a video/image signal output that meets the set video image standard, and the channel selector 2 selects The video image signal output by the third image processor 133 is received.

Through the above operating mechanism of the imaging device with the zoom lens, for the video image observer, what he sees is a continuously zoomed video image output, and the output video image is no different from that of a device equipped with a single continuous zoom lens imaging device. The focal length configuration of each zoom lens in the device can be optimally designed under current technical conditions. In this embodiment, it is F1.0-F1.0, so as to minimize the attenuation effect of the lens on the light. In this implementation example, the amount of light transmitted at both the short focal point and the long focal point can reach 1/(1*1)=100%, that is, there is no loss of light. In this case, the already excellent low-light performance of the image sensor will be fully realized.

Of course, considering factors such as implementation cost, device volume, and technical conditions of the manufacturer itself, various flexible designs such as F1.0~F1.2, F1.2~F1.2, F1.0~F1.4, etc. can also be implemented .

In the second embodiment of the zoom lens imaging device of the present invention shown in FIG. 2 , the difference from the first embodiment above is that the first, second and third zoom imaging units 11, 12, 13 do not include the first 1. The second and third image processors 113, 123, 133, and the output end of the channel selector 2 is connected to the image processor 4. The channel selector 2 is connected with the first, second and third image sensors 112, 122, 132 in the first, second and third zoom imaging units, and selects at least one of the first, second and third image sensors 112, 122, 132 as a signal input terminal The channel selector 2 receives the initial video/image electrical signals from the first, second and third image sensors 112, 122, 132 and outputs them to the image processor 4 to convert them into video image signals.

Of course, according to actual needs, the number of zoom imaging units can also be 2, 4, 5, . . . .

The present invention also provides an imaging method of a zoom lens, comprising the following steps:

S1. Determine whether the focal lengths of the current zoom imaging unit selected by the channel selector 2 as the signal input end and the zoom imaging unit to be imaged at the next moment overlap, if not, execute step S2, and if yes, execute step S3. For example, the current imaging is the first zoom imaging unit 11, and the imaging at the next moment is the second zoom imaging unit 12, then it is judged that the focal lengths of the first zoom imaging unit 11 and the second zoom imaging unit 12 overlap. If the image is the third zoom imaging unit 13 , it is determined that the focal lengths of the first imaging unit 11 and the third imaging unit 13 do not overlap.

S2. Adjust the focal length of the intermediate zoom imaging unit that overlaps with the focal length of the current imaging zoom imaging unit and the focal length is located between the current imaging zoom imaging unit and the next imaging zoom imaging unit, and the focal length of the current imaging zoom imaging unit , so that the focal length of the intermediate zoom imaging unit coincides with the focal length of the zoom imaging unit imaging at the current moment, and at the same time control the channel selector to select the intermediate zoom imaging unit as the signal input end, and return to step S1. For example, first adjust the focal length of the first zoom imaging unit 11 to coincide with the focal length of the second zoom imaging unit 12, and then control the channel selector 2 to switch from selecting the first zoom imaging unit 11 as the signal input to selecting the second zoom imaging unit 12 As a signal input terminal, after returning to step S1, it is judged that the focal length of the second zoom imaging unit 12 overlaps with the focal length of the third zoom imaging unit 13, and then step S3 is executed.

S3. Adjust the focal length of the zoom imaging unit currently imaging to coincide with the focal length of the zoom imaging unit imaging at the next moment, and the control unit controls the channel selector to select the zoom imaging unit imaging at the next moment as a signal input terminal. If the current imaging is the first zoom imaging unit 11, and the imaging at the next moment is the second zoom imaging unit 12, then the control channel selector 2 is switched from selecting the first zoom imaging unit 11 as the signal input end to selecting the second zoom imaging unit. Unit 12 serves as a signal input. If the imaging at the next moment is the third zoom imaging unit 13 , the control channel selector 2 switches from selecting the second zoom imaging unit 12 as the signal input end to selecting the third zoom imaging unit 13 as the signal input end.

The imaging method of the zoom lens also includes the following steps:

Select one of the corresponding first, second, and third zoom lenses 111 , 112 , 113 in the first, second, and third zoom imaging units 11 , 12 , and 13 to perform video/image optical imaging according to the required focal length.

The image sensor acquires the optical imaging and converts it into an original video/image electrical signal and outputs it to a corresponding image processor.

The image processor acquires the initial video/image electrical signal and converts it into a video image signal conforming to the set video image standard for output.

In another embodiment, the optical imaging can also be obtained by the image sensor and converted into an initial video/image electrical signal and output to the channel selector 2, and then the channel selector 2 outputs the initial signal to the image processor 4, and the image processor 4 Converting the original video/image electrical signal into a video image signal conforming to the set video image standard and outputting it.

To sum up, at least two or more zoom imaging units are used to shoot videos or images, the focal lengths of the zoom imaging units increase sequentially, and the focal lengths of two adjacent zoom imaging units partially overlap, thereby ensuring that the zoom lens imaging device The overall focal range is large enough, and the ratio of the long focal length to the short focal length of each zoom imaging unit is small. Under the existing technical conditions, each zoom imaging unit can have a small focal ratio, thereby reducing the attenuation of ambient light.

The control unit controls the focal length between the zoom imaging unit currently imaging and the zoom imaging unit imaging at the next moment, and the zoom imaging unit located between the focal lengths of the zoom imaging unit currently imaging and the zoom imaging unit imaging at the next moment Sequential overlap, also control the channel selector control unit The zoom imaging unit of the current imaging is used as the signal input end to switch to the zoom imaging unit for imaging at the next moment as the signal input end, so that the channel selector can be between different zoom imaging units To switch, select the zoom imaging unit corresponding to the required focal length according to actual needs to shoot the video image and then output it through the channel selector, so that the focal length range of the zoom imaging unit can be increased without increasing the attenuation of the zoom lens, that is, in large The zoom imaging unit of the range focal length reduces the attenuation effect of the zoom lens on the ambient illumination, and enables the existing performance of the image sensor to be realized at each focal length of the zoom lens.

It can be understood that the above examples only express the preferred implementation of the present invention, and its description is relatively specific and detailed, but it should not be interpreted as limiting the patent scope of the present invention; it should be pointed out that for those of ordinary skill in the art In other words, on the premise of not departing from the concept of the present invention, the above-mentioned technical features can be freely combined, and some modifications and improvements can also be made, all of which belong to the protection scope of the present invention; All equivalent transformations and modifications should fall within the scope of the claims of the present invention.

Claims (10)

1. A device for zoom lens imaging, characterized in that, comprising, At least two zoom imaging units, the focal lengths of each zoom imaging unit increase sequentially, and the focal lengths of two adjacent zoom imaging units partially overlap; A channel selector connected to the at least two zoom imaging units, used to select at least one signal input by the zoom imaging unit as its output; a control unit communicatively connected to the zoom imaging unit and the channel selector; The control unit is used to control the zoom imaging unit for current imaging, the zoom imaging unit for imaging at the next moment, and the focal length between the zoom imaging unit for imaging at the current moment and the zoom imaging unit for imaging at the next moment. The focal lengths between the two zoom imaging units overlap sequentially, and the channel selector is also controlled to sequentially switch from the current imaging zoom imaging unit as a signal input end to the next imaging zoom imaging unit as a signal input end. 2. The device for zoom lens imaging according to claim 1, wherein the zoom imaging unit comprises a zoom lens and an image sensor, The zoom lens is used to obtain optical imaging of video/image, wherein the focal lengths of the zoom lenses corresponding to each of the zoom imaging units are sequentially increased, and the focal lengths of two adjacent zoom lenses partially overlap; The image sensor, connected to the zoom lens, is used to receive the optical imaging of the video/image of the zoom lens and convert it into an initial video/image electrical signal for output. 3. the device of zoom lens imaging according to claim 2, is characterized in that, the device of described zoom lens imaging also comprises image processor, The image processor is connected with the image sensor and the channel selector, and is used to receive the initial video/image electrical signal output by the image sensor and convert it into a video/image signal conforming to a set video/image standard. Image signal output; Alternatively, the image processor is connected to the channel selector, and is used to receive the initial video/image electrical signal from the channel selector and convert it into a video/image signal conforming to a set video/image standard output. 4 . The zoom lens imaging device according to claim 2 or 3 , characterized in that, the ratio range of the telephoto lens to the short focus lens is 1-5. 5. The device for zoom lens imaging according to claim 4, wherein the control unit comprises a zoom imaging control unit and a channel selector control unit, The zoom imaging control unit is connected with the zoom imaging unit and the channel selector control unit, and is used to control the zoom imaging unit for the current imaging and the zoom imaging unit for imaging at the next moment, and the zoom imaging unit located in the The focal lengths between the zoom imaging units of the current imaging zoom imaging unit and the focal lengths of the zoom imaging unit imaging at the next moment coincide in turn, and a selection control signal is also output to the channel selector control unit to control The channel selector control unit selects the zoom imaging unit that is currently imaging as the signal input terminal and sequentially switches to the zoom imaging unit that is imaging at the next moment as the signal input terminal; The channel selector control unit is connected with the zoom imaging control unit and the channel selector, and is used to receive a selection control signal from the zoom imaging control unit to control the channel selector to select the channel selected by the current channel selector. The signal input terminal of the zoom imaging unit for imaging is sequentially switched to the signal input terminal of the zoom imaging unit for imaging at the next moment. 6 . The zoom lens imaging device according to claim 4 , wherein the focal ratio of the zoom lens is less than or equal to F2.8. 7 . The zoom lens imaging device according to claim 4 , wherein the focal ratios of different zoom lenses in the zoom lens imaging device are the same or different. 8. an imaging method of zoom lens, it is characterized in that, zoom imaging unit comprises zoom lens and image sensor, comprises the steps: A. Judging whether the focal length of the current zoom imaging unit corresponding to the signal input terminal selected by the channel selector overlaps with the zoom imaging unit for imaging at the next moment, if not, then perform step B, and if so, then perform step C; B. Adjust the focal length of the intermediate zoom imaging unit that overlaps with the focal length of the current imaging zoom imaging unit and the focal length is located between the current imaging zoom imaging unit and the next imaging zoom imaging unit, and the current imaging The focal length of the zoom imaging unit, so that the focal length of the intermediate zoom imaging unit coincides with the focal length of the zoom imaging unit imaging at the current moment, and at the same time control the channel selector to select the intermediate zoom imaging unit as a signal input end, return to step A; C. Adjust the focal length of the zoom imaging unit of the current imaging to coincide with the focal length of the zoom imaging unit of the imaging at the next moment, and the control unit controls the channel selector to select the zoom imaging unit of the imaging at the next moment as the signal input terminal . 9. the imaging method of zoom lens according to claim 8, is characterized in that, the imaging method of described zoom lens also comprises the following steps: Obtain optical imaging of video/image through zoom lens; The image sensor obtains the optical imaging of the video/image, converts it into an initial video/image electrical signal, and outputs it to the image processor; The image processor acquires the initial video/image electrical signal and converts it into a video/image signal conforming to a set video/image standard for output. 10 . The imaging method of the zoom lens according to claim 9 , wherein the range of the ratio of the telephoto to the short focal length of the zoom lens is 1-5. 11 .