Shutter rotation remote sensing wide imaging system and imaging method

Abstract

The invention relates to a shutter rotation remote sensing wide-range imaging system and an imaging method.The shutter rotation remote sensing wide-range imaging system comprises a plurality of optical camera lenses, a motor transmission mechanism, a rotation shutter mechanism and electronic optical sensor equipment shared by the multiple lenses, and the rotation shutter mechanism is arranged between the camera lenses and the electronic optical sensor equipment; the motor transmission mechanism drives a shutter of the rotary shutter mechanism to rotate so as to control light rays of different camera lenses to be sequentially transmitted to the electronic optical sensor equipment, and wide imaging of the area-array camera lens is achieved. Meanwhile, the invention provides an imaging method of the imaging system, the imaging breadth is improved under the condition that the configuration of a camera lens is not upgraded, and the development cost and the installation difficulty are reduced only by using one set of electronic equipment.

Description

Technical Field

[0001] The invention relates to the field of space optical remote sensing imaging, and in particular to a shutter rotation remote sensing wide-format imaging system and an imaging method. Background Art

[0002] Remote sensing satellites mostly obtain high-resolution remote sensing images through array camera lenses. The array camera lens realizes pixel matrix shooting. In the image captured by the camera lens, the image details are determined by the resolution, which is determined by the selected lens focal length. In addition, two-dimensional image information can be obtained, the measured image is intuitive, and the captured image has higher clarity.

[0003] However, the field of view of the array camera lens is small, and wide-width imaging mainly relies on the field of view stitching method. There are two common methods: a single camera lens is swung to image at different rotation angles or multiple independent small camera lenses are stitched together to obtain a wide field of view. The former takes a long time to image, it is difficult to achieve real-time imaging, and the signal-to-noise ratio is low, which requires high mechanical precision of the platform. The latter has multiple independent camera lenses, which is costly to develop and difficult to install. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a shutter rotary remote sensing wide-format imaging system and an imaging method. The imaging system utilizes a rotary disk carrying a shutter driven by a motor to transmit light from multiple groups of optical lenses to the same set of electronic optical sensors, thereby reducing the manufacturing cost while ensuring wide-format imaging.

[0005] In order to achieve the above purpose / solve the above technical problems, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a shutter rotary remote sensing wide-format imaging system, comprising a plurality of optical camera lenses, a rotary shutter mechanism, and an electronic optical sensor shared by the plurality of optical camera lenses; The multiple optical camera lenses are independently installed on the same plane and are used to focus light to form an image; The rotary shutter mechanism is installed between the electronic optical sensor and the multiple optical camera lenses, and is used to allow the light from each optical camera lens to enter the electronic optical sensor in turn, allowing only the light from one optical camera lens to pass through each time, and blocking the light from all other lenses from passing through; The electronic optical sensor is arranged at the common imaging position of the multiple optical camera lenses, and is used for processing the optical signal and storing the image.

[0006] Effects produced by the above settings: The present invention mainly utilizes lenses placed at different positions and a rotating shutter to realize wide-area imaging of the camera lens. Each time the shutter rotates a specific angle, the light from one lens reaches the electronic optical sensor to realize imaging. Only one set of electronic equipment is used to reduce the development cost and facilitate later image stitching.

[0007] Furthermore, the multiple optical camera lenses are evenly distributed in a circular shape.

[0008] The above settings produce the following effects: the optical camera lenses are evenly distributed in a circular shape, which facilitates the rotary shutter mechanism to control the passage of light and the amount of light passing through all the optical camera lenses, thereby allowing light from only one optical camera lens to pass through at a time.

[0009] Further, the rotary shutter mechanism includes a wheel equipped with a shutter and a motor driving the wheel; The motor drives the wheel to rotate, and after rotating to a preset angle, it stops rotating and immediately stabilizes, controls the shutter opening and closing so that the light of the lens overlapping with the shutter is transmitted to the electronic optical sensor, and after imaging, it continues to rotate to the next lens for imaging.

[0010] The effect of the above settings is: the wheel equipped with a shutter and the motor driving the wheel can achieve relatively precise control of the wheel rotation angle, and control the passage of light and the amount of light passing through all optical camera lenses, allowing only light from one optical camera lens to pass through at a time, blocking the passage of light from all other lenses.

[0011] Furthermore, the optical camera has three lenses; the preset angle is 120°.

[0012] The effect of the above settings: After testing, 3 optical camera lenses are the optimal number, which can achieve full field of view, high accuracy, good stitching effect, and low cost.

[0013] Furthermore, the projection overlap of the images formed by adjacent optical camera lenses on the plane of the electronic optical sensor is between 10% and 15%.

[0014] The effect of the above settings is: the overlap can accurately provide the necessary position information for image stitching without occupying the imaging area as much as possible.

[0015] In a second aspect, the present invention provides an imaging method of a shutter rotation remote sensing wide-format imaging system. The shutter rotation remote sensing wide-format imaging system described in the first aspect comprises the following steps: The plurality of optical camera lenses are independently mounted on the same plane, an electronic optical sensor is arranged at a common imaging position of the plurality of optical camera lenses, and a rotary shutter mechanism is mounted between the electronic optical sensor and the plurality of optical camera lenses; The rotary shutter mechanism only allows light from one optical camera lens to pass through at a time, blocking the light from all other lenses, so that the light from each lens is transmitted to the electronic optical sensor in turn, and the electronic optical sensor processes the light signal and stores the image. After the image is formed, it continues to rotate, repeating the cycle until the image is completed.

[0016] Furthermore, the plurality of optical camera lenses are evenly distributed in a circular shape; the rotary shutter mechanism comprises a wheel equipped with a shutter and a motor driving the wheel; Methods for allowing light from only one optical camera lens to pass through at a time by means of a rotary shutter mechanism and blocking light from all other lenses include: Step 1, when the wheel and the shutter are in the initial position, the shutter is opened, and the light focused by the lens overlapping the shutter is controlled to pass through, and the electronic optical sensor forms an image once; Step 2: After the imaging is completed, the shutter is closed, and the motor starts to work to drive the wheel to rotate, and each rotation angle is preset so that the shutter overlaps with the next shot; Step 3, after the wheel is stable, the shutter is opened, the light focused by the lens overlapping the shutter is controlled to pass through, and the electronic optical sensor forms an image once; Step 4, repeat the process of steps 2-3 until the wheel rotates to the end position, the shutter overlaps with the last lens, and the shutter opens after the wheel is stable, controlling the light focused by the lens overlapping with the shutter to pass through, and then the electronic optical sensor forms an image once; Step 5: The wheel quickly rotates back to its initial position, and the images formed by the electronic optical sensor are stitched together to form a wide-format photo of the observation area.

[0017] Furthermore, the method further comprises: Installing the shutter rotation remote sensing wide-format imaging system on an aircraft; Make the aircraft pass over the observation area at a preset speed, repeat steps 1 to 5 multiple times, and stitch the images formed in the process in sequence to form a wide-format photo of the observation area.

[0018] Furthermore, the optical camera has three lenses; the preset angle is 120°.

[0019] Furthermore, the projection overlap of the images formed by adjacent optical camera lenses on the plane of the electronic optical sensor is between 10% and 15%.

[0020] The effect of the above settings is determined by the aircraft speed and the duration of each photo, so as to ensure 10%-15% overlap and image quality between two consecutive photos (avoiding too dark and overexposure).

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention mainly utilizes lenses placed at different positions and a rotating shutter to realize wide-area imaging of the camera lens. Each time the shutter rotates a specific angle, the light from one lens reaches the electronic optical sensor to realize imaging. Only one set of electronic equipment is used to reduce the development cost and facilitate the later image stitching. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor: Figure 1 It is a schematic diagram of a roulette wheel rotation wide-width imaging system; Figure 2 Schematic diagram of image stitching; Figure 3 This is the workflow diagram of the roulette wheel wide-format imaging system.

[0023] In the figure: 1. Lens; 2. Roulette; 3. Motor; 4. Electro-optical sensor. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0025] In the description of this embodiment, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this embodiment and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this embodiment. Embodiment 1:

[0026] This embodiment provides a shutter rotation remote sensing wide-format imaging system, such as Figure 1-2 As shown, it includes a plurality of optical camera lenses 1, a rotary shutter mechanism, and an electronic optical sensor 4 shared by the plurality of optical camera lenses 1; Optical camera lens 1: used to focus light to form an image.

[0027] Rotary shutter mechanism: used to control the passage of light.

[0028] Electronic optical sensor 4: used to process light signals and store images.

[0029] By rotating the wheel 2 multiple times, each camera lens 1 forms an image on the sensor in turn, and wide-area imaging is achieved through subsequent image stitching.

[0030] A plurality of optical camera lenses 1 are independently installed on the same plane to focus light to form an image.

[0031] The rotary shutter mechanism is installed between the electronic optical sensor 4 and multiple optical camera lenses 1, and is used to allow the light from each optical camera lens 1 to enter the electronic optical sensor 4 in turn, allowing only the light from one optical camera lens 1 to pass through each time, and blocking the light from all other lenses 1 from passing through.

[0032] Preferably, the plurality of optical camera lenses 1 are evenly distributed in a circular shape. The rotary shutter mechanism comprises a wheel 2 equipped with a shutter and a motor 3 driving the wheel 2; the motor 3 drives the wheel 2 to rotate, stops rotating after rotating a preset angle and immediately stabilizes, controls the shutter opening and closing so that the light of the lens 1 overlapping with the shutter is transmitted to the electronic optical sensor 4, and continues to rotate to the next lens 1 for imaging after imaging, and continues to rotate after imaging, repeating the cycle until imaging is completed.

[0033] The electronic optical sensor 4 is arranged at the common imaging position of the plurality of optical camera lenses 1 and is used for processing the optical signal and storing the image.

[0034] This system mainly utilizes lenses 1 placed at different positions and a rotating shutter to realize wide-area imaging of the camera lens 1. Each time the shutter rotates a specific angle, the light from one lens 1 reaches the electronic optical sensor 4 to realize imaging. Only one set of electronic equipment is used to reduce the development cost and facilitate the later image stitching.

[0035] like Figure 1 , there are multiple camera lenses 1 in front of the wheel 2, and each camera lens 1 is arranged along the arc of the wheel 2 (rather than arranged horizontally), so that the opening and closing of all camera lenses 1 can be controlled by rotating a shutter on the wheel 2. Therefore, the average angle from the starting position of the first camera lens 1 to the ending position of the last camera lens 1 on the arc is the angle of each rotation.

[0036] The imaging position of each camera lens 1 is set to a point, that is, the position where the electronic optical sensor 4 is designed. Generally speaking, the size models of multiple camera lenses 1 are exactly the same, and the center points of each camera lens 1 are on a circle. At the same time, the lens 1 direction of the camera lens 1 is tilted outward at a uniform angle, and the central axes of the multiple camera lenses 1 are connected to one point.

[0037] The shutter opening and closing time should be determined according to the parameter settings of the camera lens 1, such as exposure time, integration level, gain and other parameters. For example, when the light conditions are poor, the shutter opening time needs to be increased.

[0038] The camera lens 1 only needs to confirm the start time and the working time. The start time is determined by the individual choosing the right time to press the shooting button. The working time depends on the width of the desired image. The larger the width, the longer the working time.

[0039] Preferably, the number of optical camera lenses 1 is three; the preset angle is 120°.

[0040] Specifically, the multiple optical camera lenses 1 are independently installed on the same plane, and the projection overlap of the images formed by adjacent lenses 1 on the plane of the electronic optical sensor 4 is 10%-15% (single-side overlap), and the overlapping area has small images spliced ​​together to generate a wide image. This overlap can accurately provide the necessary position information for image splicing without occupying the imaging area as much as possible.

[0041] The rotary shutter mechanism is used to control the passage of light and the amount of light passing through all the optical camera lenses 1 , allowing light from only one optical camera lens 1 to pass through each time, and blocking light from all other lenses 1 from passing through.

[0042] Preferably, the shutter rotary remote sensing wide-format imaging system can be installed on an aircraft; the aircraft is made to pass over the observation area at a preset speed, and the images formed in the process are stitched together in sequence to form a wide-format photo of the observation area. The imaging cycle of the camera lens 1 is determined by the aircraft speed and the duration of each photo, so as to ensure 10%-15% overlap and image quality between two adjacent photos (avoiding over-darkness and over-exposure).

[0043] The specific method of using the mechanism of this embodiment is as follows: like Figure 3 As shown, the following steps are included: Step 1, when the shutter is triggered, the shutter is in the initial position, at which time the shutter is open, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and the camera lens 1 forms an image once; Step 2, after the imaging is completed, the shutter is closed, and the motor 3 starts to work to drive the wheel 2 to rotate, and each time the preset angle is rotated, the shutter overlaps with the next lens 1; Step 3, after the wheel 2 is stable, the shutter is opened, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and the camera lens 1 forms an image once; Step 4, repeat the process of steps 2-3 until the wheel 2 rotates to the end position, the shutter overlaps with the last lens 1, and the wheel 2 is stable, the shutter is opened, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and an image is formed; Step 5, the wheel 2 is rotated back to the initial position, and the process from step 2 to step 4 is repeated. Figure 2 As shown, stitch the images taken during the process together (automatically or manually, Figure 2 The numbers in the figure represent the stitching order of the images), forming a wide picture of the observation area.

[0044] Implementation principle: The electronic optical sensor 4 is shared by all lenses 1. The electronic optical sensor 4 is located behind the wheel 2 and can receive light signals from all lenses 1. The light from each lens 1 can be completely transmitted to the electronic optical sensor 4 through the shutter to form an image. The rotary shutter mechanism can be placed between the camera lens 1 and the electronic sensor device. The shutter of the rotary shutter mechanism is driven to rotate by the transmission mechanism of the motor 3 to control the light from different camera lenses 1 to be transmitted to the electronic sensor device in sequence, thereby realizing wide-format imaging of the array camera lens 1. At the same time, an imaging method of the above imaging system is provided. The imaging width is increased without upgrading the configuration of the camera lens 1, and only one set of electronic equipment is used to reduce the development cost and installation difficulty. Embodiment 2:

[0045] This embodiment provides an imaging method of a remote sensing imaging system, based on the remote sensing imaging system described in Embodiment 1, such as Figure 3 As shown, the following steps are included: Step 1, when the shutter is triggered, the shutter is in the initial position, at which time the shutter is open, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and the camera lens 1 forms an image once; Step 2, after the imaging is completed, the shutter is closed, and the motor 3 starts to work to drive the wheel 2 to rotate, and each time the preset angle is rotated, the shutter overlaps with the next lens 1; Step 3, after the wheel 2 is stable, the shutter is opened, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and the camera lens 1 forms an image once; Step 4, repeat the process of steps 2-3 until the wheel 2 rotates to the end position, the shutter overlaps with the last lens 1, and the wheel 2 is stable, the shutter is opened, and the light focused by the lens 1 overlapping with the shutter is controlled to pass through, and an image is formed; Step 5, the wheel 2 is rotated back to the initial position, and the process from step 2 to step 4 is repeated. Figure 2 As shown, stitch the images taken during the process together (automatically or manually, Figure 2 The numbers in the figure represent the stitching order of the images), forming a wide picture of the observation area.

[0046] Preferably, the method further comprises: Installing the shutter rotation remote sensing wide-format imaging system on an aircraft; Make the aircraft pass over the observation area at a preset speed, repeat steps 1 to 5 multiple times, and stitch the images formed in the process in sequence to form a wide-format photo of the observation area.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A shutter rotation remote sensing wide-format imaging system, characterized in that: comprising a plurality of optical camera lenses, a rotary shutter mechanism, and an electronic optical sensor shared by the plurality of optical camera lenses; The multiple optical camera lenses are installed on the same plane to focus light to form an image; The rotary shutter mechanism is installed between the electronic optical sensor and the multiple optical camera lenses, and is used to allow the light from each optical camera lens to enter the electronic optical sensor in turn, allowing only the light from one optical camera lens to pass through each time, and blocking the light from all other lenses from passing through; The electronic optical sensor is arranged at the common imaging position of the multiple optical camera lenses, and is used for processing the optical signal and storing the image.

2. The shutter rotation remote sensing wide-format imaging system according to claim 1, characterized in that: The multiple optical camera lenses are evenly distributed in a circular shape.

3. The shutter rotation remote sensing wide-format imaging system according to claim 2, characterized in that: The rotary shutter mechanism includes a wheel with a shutter and a motor for driving the wheel; The motor drives the wheel to rotate, and after rotating to a preset angle, it stops rotating and immediately stabilizes, so that the shutter overlaps with each lens in turn, and controls the opening and closing of the shutter so that the light of the lens overlapping with the shutter is transmitted to the electronic optical sensor, and after imaging, it continues to rotate to the next lens for imaging.

4. The shutter rotation remote sensing wide-format imaging system according to claim 3, characterized in that: The optical camera has three lenses, and the preset angle is 120°.

5. The shutter rotation remote sensing wide-format imaging system according to claim 1, characterized in that: The projection overlap of the images formed by adjacent optical camera lenses on the plane of the electronic optical sensor is 10%-15%.

6. An imaging method for a shutter rotation remote sensing wide-format imaging system, characterized in that: The shutter rotation remote sensing wide-format imaging system according to claim 1 comprises the following steps: The plurality of optical camera lenses are independently mounted on the same plane, an electronic optical sensor is arranged at a common imaging position of the plurality of optical camera lenses, and a rotary shutter mechanism is mounted between the electronic optical sensor and the plurality of optical camera lenses; The rotary shutter mechanism only allows light from one optical camera lens to pass through at a time, blocking the light from all other lenses, so that the light from each lens is transmitted to the electronic optical sensor in turn, and the electronic optical sensor processes the light signal and stores the image. After the image is formed, it continues to rotate and repeats the above steps until the image is completed.

7. The imaging method according to claim 6, characterized in that: The multiple optical camera lenses are evenly distributed in a circular shape; the rotary shutter mechanism includes a wheel with a shutter and a motor driving the wheel; Methods for allowing light from only one optical camera lens to pass through at a time by means of a rotary shutter mechanism and blocking light from all other lenses include: Step 1, when the wheel and the shutter are in the initial position, the shutter is opened, and the light focused by the lens overlapping the shutter is controlled to pass through, and the electronic optical sensor forms an image once; Step 2: After the imaging is completed, the shutter is closed, and the motor starts to work to drive the wheel to rotate, and each rotation angle is preset so that the shutter overlaps with the next shot; Step 3, after the wheel is stable, the shutter is opened, the light focused by the lens overlapping the shutter is controlled to pass through, and the electronic optical sensor forms an image once; Step 4, repeat the process of steps 2-3 until the wheel rotates to the end position, the shutter overlaps with the last lens, and the shutter opens after the wheel is stable, controlling the light focused by the lens overlapping with the shutter to pass through, and then the electronic optical sensor forms an image once; Step 5: The wheel quickly rotates back to its initial position, and the images formed by the electronic optical sensor are stitched together to form a wide-format photo of the observation area.

8. The imaging method according to claim 7, characterized in that: The method further comprises: Installing the shutter rotation remote sensing wide-format imaging system on an aircraft; Make the aircraft pass over the observation area at a preset speed, repeat steps 1 to 5 multiple times, and stitch the images formed in the process in sequence to form a wide-format photo of the observation area.

9. The imaging method according to claim 7, characterized in that: The optical camera has three lenses, and the preset angle is 120°.

10. The imaging method according to claim 6, characterized in that: The projection overlap of the images formed by adjacent optical camera lenses on the plane of the electronic optical sensor is 10%-15%.

Images