CN110519483B - Multi-lens frame synchronization system for panoramic camera testing - Google Patents
Multi-lens frame synchronization system for panoramic camera testing Download PDFInfo
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- CN110519483B CN110519483B CN201910810356.4A CN201910810356A CN110519483B CN 110519483 B CN110519483 B CN 110519483B CN 201910810356 A CN201910810356 A CN 201910810356A CN 110519483 B CN110519483 B CN 110519483B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
Abstract
The embodiment of the application provides a multi-lens frame synchronization system for testing a panoramic camera, which comprises the following steps: the device comprises a testing device, a panoramic camera and a plurality of testing mirrors, wherein the quantity of the testing mirrors is the same as that of at least two lenses with exposure time to be tested of the panoramic camera, the testing device comprises a turntable with a motor, a control unit is used for controlling the lenses with exposure time to be tested in the panoramic camera to shoot image data, determining initial exposure time of the lenses with exposure time to be tested according to fan-shaped smear of a pointer shot in the image data, determining average exposure time starting time of the initial exposure time of the obtained lenses with exposure time to be tested, determining that the difference value between the initial exposure time of the lenses with exposure time to be tested and the average exposure time starting time is in a preset range, and determining that frames of the lenses with exposure time to be tested are synchronous. The system provides a brand-new frame synchronization detection scheme of the multi-lens module in the panoramic camera field, is simple in layout, high in flexibility, small in system construction difficulty and easy to maintain.
Description
Technical Field
The application relates to the field of image pickup, in particular to a multi-lens frame synchronization system for a panoramic camera.
Background
In the panoramic field, a panoramic camera consists of two or more lens modules, different lens modules independently image, and then images shot by the lens modules are spliced together through a stitching algorithm, so that a 360-degree panoramic image is formed. Since a panoramic image is stitched from images imaged by a plurality of lens modules, to stitch a good image, the various attribute parameters of the images before stitching must be consistent or very close, including frame synchronization. Currently, the field of panoramic photography belongs to an emerging field, mass production of panoramic cameras requires batch testing, and up to now no measurement scheme for whether exposure times of a plurality of lenses of the panoramic cameras are synchronous has occurred.
In the scheme of measuring exposure time by a non-panoramic image pickup apparatus, one technique is to light LEDs on an array one by one using an LED array, a panoramic camera shoots an image on the LED array, and the exposure time of the panoramic camera is calculated by checking the number of LEDs shot to light on the image and combining the frequency of lighting of the LEDs. Another technique is to use two sets of rotating mirrors to project the light of the point light source onto the reflecting plate, and calculate the exposure time of the panoramic camera by combining the number of bright lines on the imaging reflecting plate and the rotation speed of the mirrors. The existing exposure time detection technology is low in precision, poor in flexibility, complex in system, high in system building difficulty, too simple in mode and low in precision.
Therefore, in the field of panoramic camera production, there is a need to provide a scheme for testing the multi-lens frame synchronization of a panoramic camera, and a scheme for improving the accuracy of the frame synchronization detection technology and enhancing the flexibility of the frame synchronization detection technology.
Disclosure of Invention
The embodiment of the application provides a multi-lens frame synchronization system for testing panoramic cameras, which is used for improving the accuracy and flexibility of frame synchronization detection technology.
Preset scope in one aspect, an embodiment of the present application provides a system for testing multi-lens frame synchronization of a panoramic camera, including: the device comprises a testing device, a panoramic camera and a plurality of testing mirrors, wherein the number of the testing mirrors is the same as that of at least two lenses of the panoramic camera, the lenses are used for exposure time to be tested, the testing device comprises a turntable with a motor, a pointer is fixed at the center of the turntable, an angle scale of 360 degrees is arranged on the periphery of one surface of the turntable, where the pointer is fixed, and the center of the angle scale of 360 degrees is concentric with the center of the turntable;
a control unit that controls a lens of the exposure time to be measured in the panoramic camera to capture image data including the pointer, the dial, and the angle scale imaged in the mirror corresponding to the lens of the exposure time to be measured when the dial is rotated according to a predetermined rotational speed of the motor; determining the initial exposure time of the lens with the exposure time to be tested according to the fan-shaped smear of the pointer shot in the image data, determining the average exposure time starting time of the initial exposure time of all the obtained lenses with the exposure time to be tested, determining that the difference value between the initial exposure time of any lens with the exposure time to be tested and the average exposure time starting time is in a preset range, and determining that the frames of the lenses with the exposure time to be tested are synchronous.
Optionally, the method further includes a determining unit, configured to determine an initial exposure time of the lens of the exposure time to be tested according to a fan-shaped smear of the pointer captured in the image data, determine an average exposure time starting time of initial exposure times of all obtained lenses of the exposure time to be tested, determine that a difference value between the initial exposure time of any lens of the exposure time to be tested and the average exposure time starting time is within a preset range, and determine that frames of the lenses of the exposure time to be tested are synchronous.
Optionally, the control unit is built in the panoramic camera, after receiving an operation instruction of a user, the control unit sends a control instruction to a lens module of exposure time to be tested in the panoramic camera, and the lens module controls a corresponding lens of exposure time to be tested to shoot image data imaged in the test mirror corresponding to the lens of exposure time to be tested.
Optionally, the control unit is externally arranged on the panoramic camera, is in remote communication with the panoramic camera or is connected through a communication interface, and after receiving an operation instruction of a user, the control unit sends a control instruction to a lens module of exposure time to be tested in the panoramic camera, and the lens module controls a corresponding lens of exposure time to be tested to shoot image data imaged in the test mirror corresponding to the lens of exposure time to be tested.
Optionally, the motor is a motor with a rotation number display; the image data includes the pointer, the dial and the angle scale, and the number of rotations of the motor.
Optionally, the determining unit is further configured to select, when the image data is video data, a sector smear of the pointer captured in a frame picture at a same frame position in the video data captured by each lens of the exposure time to be detected, and determine an initial exposure time of the lens of the exposure time to be detected.
Optionally, the determining unit is further configured to determine that, in the initial exposure times of the obtained shots with all exposure times to be measured, a difference between each initial exposure time and the starting time of the average exposure time is within the preset range, and determine that frames of the shots with all exposure times to be measured are synchronous.
Optionally, the panoramic camera includes two or more optical lenses.
Optionally, the panoramic camera includes four fisheye optical lenses, four fisheye optical lenses one-to-one are distributed on four panels of the panoramic camera, the four fisheye optical lenses are located on the same horizontal plane, and each panel is provided with a physical shooting button or a touch screen shooting control for controlling the corresponding distributed fisheye optical lenses to shoot.
Optionally, the determining unit is inside the panoramic camera; or the determining unit is arranged outside the panoramic camera and is in remote communication with the panoramic camera or connected through a communication interface; or, the determining unit is built in the control unit or replaced by the control unit to realize the function of the determining unit.
Optionally, the determining unit is further configured to determine a maximum value of all differences between each of the obtained starting exposure times and the average exposure time starting time, and determine that the maximum value is within a target range, where the lens of the plurality of exposure times to be tested or the lens of all exposure times to be tested is frame-synchronized.
From the above technical solutions, the embodiment of the present application has the following advantages:
the embodiment of the application provides a multi-lens frame synchronization system for testing a panoramic camera, which comprises the following steps: the device comprises a testing device, a panoramic camera and a plurality of testing mirrors, wherein the number of the testing mirrors is the same as that of at least two lenses of the panoramic camera, the lenses are used for exposure time to be tested, the testing device comprises a turntable with a motor, a pointer is fixed at the center of the turntable, an angle scale of 360 degrees is arranged on the periphery of one surface of the turntable, where the pointer is fixed, and the center of the angle scale of 360 degrees is concentric with the center of the turntable; a control unit that controls a lens of the exposure time to be measured in the panoramic camera to capture image data including the pointer, the dial, and the angle scale imaged in the mirror corresponding to the lens of the exposure time to be measured when the dial is rotated according to a predetermined rotational speed of the motor; determining the initial exposure time of the lens with the exposure time to be tested according to the fan-shaped smear of the pointer shot in the image data, determining the average exposure time starting time of the initial exposure time of all the obtained lenses with the exposure time to be tested, determining that the difference value between the initial exposure time of any lens with the exposure time to be tested and the average exposure time starting time is in a preset range, and determining that the frames of the lenses with the exposure time to be tested are synchronous. The test system provides a brand-new frame synchronization detection scheme of the multi-lens module in the panoramic camera field. In addition, the frame synchronization detection scheme of the multi-lens module is simple in layout, high in flexibility, simple in system, small in system building difficulty, easy and convenient to maintain, and easy to replace parts to be maintained. In addition, in the present embodiment, the accuracy of the exposure time detection technique is high, and thus the accuracy of the frame synchronization detection result is high.
Drawings
Fig. 1 is a block diagram of a multi-lens frame synchronization detection system for a panoramic camera according to an embodiment of the present application;
FIG. 2 is a diagram of a test apparatus according to an embodiment of the present application;
FIG. 3 is a schematic view of a turntable and an angle scale according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the accuracy of an angle scale according to an embodiment of the present application;
fig. 5 is a block diagram of a control unit in a multi-lens frame synchronization detection system for a panoramic camera according to another embodiment of the present application;
FIG. 6 is a schematic view of sector angles of an exposure time pointer sweep according to an embodiment of the present application;
fig. 7 is a block diagram of a multi-lens frame synchronization detection system for a panoramic camera according to another embodiment of the present application;
fig. 8 is a block diagram of a determining unit in a multi-lens frame synchronization detecting system for testing a panoramic camera according to another embodiment of the present application;
fig. 9 is a block diagram of a determining unit in a multi-lens frame synchronization detecting system for testing a panoramic camera according to another embodiment of the present application;
fig. 10 is a block diagram of a multi-lens frame synchronization detection system for a panoramic camera according to another embodiment of the present application.
Detailed Description
The embodiment of the application provides a multi-lens frame synchronization system for testing a panoramic camera, which is used for improving the technical precision and the flexibility of multi-lens frame synchronization detection.
As shown in fig. 1, an embodiment of the present application provides a system for testing multi-lens frame synchronization of a panoramic camera, including: a testing device 1, a panoramic camera 2 and a plurality of test mirrors 3, the number of which is the same as the number of lenses of at least two exposure times to be tested of said panoramic camera 2. In the embodiment of the present application, taking a lens for testing 4 exposure times to be tested as an example, therefore, as shown in fig. 1, the test panorama camera multi-lens frame synchronization system includes 4 test mirrors 3, each of the test mirrors 3 is used for imaging a turntable 11 facing the test mirror 3. In the present embodiment, the turntable 11 is part of the testing device 1. As shown in fig. 1, 4 test mirrors image the turntable 11 towards the test mirror 3, respectively, a first image 31, a second image 32, a third image 33 and a fourth image 34. And as shown in fig. 1, all the lenses of the panoramic camera 2 for exposure time to be tested are oppositely arranged in a one-to-one correspondence with the plurality of test mirrors 3. As shown in fig. 1 and 2, the testing device 1 includes the turntable 11 with a motor 10, a pointer 12 is fixed at the center of the turntable 11, an angle scale 13 of 360 degrees is disposed on the periphery of one surface of the turntable 11 where the pointer 12 is fixed, and the center of the angle scale 13 of 360 degrees is concentric with the center of the turntable 11.
In the embodiment of the application, the turntable 11, the angle scale 13 and the constant speed motor 10 are installed together and placed on the side of the panoramic camera 2. A plane mirror, i.e. a test mirror 3, is vertically placed in front of each lens module of the panoramic camera 2, and the test mirror 3 is slightly stabilized. The angle of the plane mirror in front of each lens module and the angle and the azimuth of the constant-speed motor are adjusted so that each lens of the panoramic camera 2 can completely and clearly shoot the turntable 11, the pointer 12 and the angle scale 13 through the plane mirror. The orientations of the plane mirror, the motor 10 and the panoramic camera 2 are fixed.
In the embodiment of the present application, the system for testing the multi-lens frame synchronization of the panoramic camera further includes a control unit 5, wherein the control unit 5 communicates with the panoramic camera 2, specifically, the control unit 5 communicates with lens modules of the panoramic camera 2 to be tested for exposure time, and each lens module correspondingly controls at least one lens. In the embodiment of the present application, an independent corresponding lens of each lens module is taken as an example for explanation.
When the turntable 11 rotates according to a predetermined rotation speed of the motor 10, the control unit 5 controls the lens of the exposure time to be measured in the panoramic camera 2 to capture image data including the pointer 12, the turntable 11, and the angle scale 13, which includes the image in the test mirror 3 corresponding to the lens of the exposure time to be measured. During the exposure of the panoramic camera 2, the moving track of the rotating pointer 12 forms a fan-shaped shadow, also called a fan-shaped smear, in the captured image.
In the embodiment of the present application, after receiving an operation instruction of a user, the control unit 5 sends a control instruction to the lens module of the exposure time to be tested in the panoramic camera 2, and the lens module controls the corresponding lens of the exposure time to be tested to shoot the image data imaged in the test mirror 3 corresponding to the lens of the exposure time to be tested. Each lens module is internally arranged in the panoramic camera, and the lens of the lens module is externally arranged in the panoramic camera and is used for shooting image data.
As shown in fig. 3, the turntable 11 provided in this embodiment is circular, and the pointer 12 is a radius of the turntable 11. The pointer 12 is used to form a fan-shaped shadow along with the rotation of the turntable 11 during the exposure process of the panoramic camera 2. To increase the color depth of the fan-shaped shadow, the circular turntable is colored with a white background, while the width of the pointer 12 is greater than 1/20 the pointer length, and the pointer is dark, preferably black. To improve the accuracy of the fan-shaped shadow angle measurement, isosceles triangles are required to be used at both ends of the circle center and the circular edge to which the pointer 12 points. The vertex angle of an isosceles triangle near one end of the circle center falls on the circle center, and the bottom edge pointer 12 points to the direction of the round edge; the vertex angle of an isosceles triangle close to the round edge falls on the round edge, and the bottom edge pointer 12 points to the circle center direction. Preferably, the length of the base of the two isosceles triangles is greater than 3 times the width of pointer 12. Preferably, an isosceles triangle is used as the isosceles triangle. The turntable 11 is mounted on the constant speed motor 11. The center of the turntable is arranged opposite to the center of the rotating shaft of the motor 11.
Optionally, the turntable 11 is detachably connected to said motor 11.
Optionally, an angle scale 13 is detachably connected to the turntable 11.
Preferably, the angle scale 13 is a disc slightly larger than the turntable 11, scale marks are evenly distributed outwards in the outer edge of the turntable 11, and the scales are clear enough, so that after the panoramic camera shoots, the arrow of the pointer 12 of the turntable 11, namely the scale mark values pointed at both sides of the sector smear, can be clearly distinguished from the shot image.
Optionally, the testing device 1 includes a turntable sleeve, the outer periphery of the turntable sleeve is provided with the 360-degree angle scale 13, and the turntable 11 is sleeved with the turntable sleeve, so that the outer periphery of one surface of the turntable 11, on which the pointer 12 is fixed, is fixedly provided with the 360-degree angle scale 13.
In the testing device, the scales of the 360-degree angle scale 13 are exposed around the outer edge of the rotary table 11, and the circle center of the scale orientation is concentric with the circle center of the rotary table 11. The angle scale 13 is fixed and cannot be rotated or moved during the test. Preferably, the angle scale 13 is a disc slightly larger than the turntable 11. As shown in fig. 4, the scales of the angle scale 13 are uniformly dispersed outwards in the outer edge of the turntable 11, and the scales are clear enough so that after the panoramic camera 2 shoots, the arrow of the turntable pointer 12, that is, the scale values of the angle scale 13 pointed at the two sides of the sector smear can be clearly distinguished in the shot image.
In this embodiment of the present application, the control unit 5 may be external to the panoramic camera 2, and connected to the panoramic camera 2 through a wired interface such as remote communication or wired communication, so as to send a control instruction to the panoramic camera 2 after receiving an operation instruction of a user, so as to start a processor in the panoramic camera 2 to trigger a shooting function of a lens module for exposure time to be measured, where the lens module controls a corresponding lens for exposure time to be measured to shoot image data imaged in the test mirror 3 corresponding to the lens for exposure time to be measured. In other embodiments, as shown in fig. 5, the control unit 5 may be built in the panoramic camera 2, and after receiving an operation instruction of a user, send a control instruction to a lens module of the exposure time to be tested in the panoramic camera 2, where the lens module controls a lens of the exposure time to be tested to shoot image data imaged in the test mirror 3 corresponding to the lens of the exposure time to be tested.
In the embodiment of the present application, after obtaining the fan-shaped smear angle of the pointer 12 captured in the image data, the user determines the initial exposure time of the lens of the exposure time to be tested according to the fan-shaped smear of the pointer captured in the image data, determines the average exposure time starting time of the initial exposure times of the lenses of all the obtained exposure times to be tested, determines that the difference between the initial exposure time of any lens of the exposure times to be tested and the average exposure time starting time is within a preset range, and determines that the frames of the lenses of the exposure times to be tested are synchronous.
As shown in figure 6 as a smear indication of exposure time for a single test,and->Respectively two scales corresponding to the arrows on two sides of the sector in the sector smear, < + >>And->Directly reading the +.>For a larger value, +.>Is a smaller value.
In the embodiment of the application, the frame starting time, i.e. the initial exposure time (also called exposure starting time) t s The method comprises the following steps:
i.e.
In the embodiment of the application, N is the rotating speed of the turntable, is set when the rotating speed of the motor is regulated, can be directly read in a setting interface of the rotating speed of the motor, and N1 is the rotating number of the motor.
The single shooting is easily influenced by the interference factors of the environment and the operation, and the average value of the initial exposure time of the multiple test exposure time of the lens of the exposure time to be tested can be calculated through the initial exposure time of the multiple repeated test exposure time, so that the influence of the interference factors of the environment and the operation on the test result is reduced. Then, determining an average value of initial exposure times of the lenses of the exposure time to be detected according to sector-shaped smear of the pointer shot in the image data, and determining the maximum value in the average value difference value of every two initial exposure times in the obtained average value of the initial exposure times of the lenses of all the exposure time to be detected; and if the maximum value is determined to be in the preset range, determining the frame synchronization of the lenses for measuring all the exposure time to be measured.
Alternatively, in another embodiment, as shown in fig. 7, based on the test panoramic camera multi-lens frame synchronization system shown in fig. 1, the method further includes a determining unit 6, where the determining unit 6 communicates with the panoramic camera 2. The determination unit 6 determines a start exposure time of the lens of the exposure time to be measured in accordance with a fan-shaped smear angle of the pointer 12 photographed in the image data.
In the embodiment of the present application, based on the test panoramic camera multi-lens frame synchronization system shown in fig. 1, as shown in fig. 8, the determining unit 6 may be built in the panoramic camera 2, directly acquire the image data from a lens module or a database shot by the panoramic camera 2, so as to determine the initial exposure time of the lens with the exposure time to be tested according to the fan-shaped smear angle of the pointer 12 shot in the image data, determine the initial exposure time of the lens with the exposure time to be tested according to the fan-shaped smear angle of the pointer shot in the image data, determine the average exposure time starting time of the initial exposure times of the lenses with all acquired exposure times to be tested, determine that the difference between the initial exposure time of any lens with the exposure time to be tested and the average exposure time starting time is within a preset range, and determine that the frames of the lens with the exposure time to be tested are synchronous.
In other embodiments, the determination unit 6 may be built in the control unit 5 as shown in fig. 9, based on the test panoramic camera multi-lens frame synchronization system shown in fig. 1. When the control unit 5 is inside the panoramic camera 2, which corresponds to the determining unit 6 being built in the panoramic camera 2, the image data may be directly obtained from a lens module or a database shot by the panoramic camera 2, so as to determine the initial exposure time of the lens of the exposure time to be measured according to the fan-shaped smear angle of the pointer 12 shot in the image data. The determining unit 6 may acquire the image data from a lens module or a database photographed by the panoramic camera 2 through the control unit 5. When the control unit 5 is external to the panoramic camera 2, the determining unit 6 may obtain the image data from the lens module or the database shot by the panoramic camera 2 through the control unit 5, so as to determine the initial exposure time of the lens of the exposure time to be tested according to the fan-shaped smear angle of the pointer 12 shot in the image data. When the control unit 5 is external to the panoramic camera 2, the determination unit 6 may be further independently separated from the control unit 5, each of which is disposed outside the panoramic camera 2, and connected to the panoramic camera 2 through a wired interface such as remote communication or wired communication. In other embodiments, the function of the determining unit may be implemented by the control unit 5 instead of the determining unit 6, for example, the function of "determining the initial exposure time of the lens of the exposure time to be measured from the fan-shaped smear angle of the pointer photographed in the image data" or more may be implemented by the control unit 5 instead of the determining unit 6.
Alternatively, as shown in fig. 10, based on the test panoramic camera multi-lens frame synchronization system shown in fig. 1, the motor 10 is a motor 10 with a rotation number display; the image data includes the number of rotations of the pointer 12, the dial 11 and the angle scale 13, and the motor 10.
In this scheme, owing to adopt the carousel of taking angle scale and pointer to adopt the motor that has the number of turns display function, use the mode of test mirror imaging simultaneously, realized the uniformity of every camera lens module test environment, will come from the difference that the shooting shot the object will be minimum.
Optionally, the determining unit 6 is further configured to, when the image data is video data, select a fan-shaped smear angle of the pointer 12 captured in a frame picture of a same frame position in the video data captured by each lens of the exposure time to be detected, and determine an initial exposure time of the lens of the exposure time to be detected.
During testing, the angles of the plane mirrors in front of the lens modules and the angles and the orientations of the constant-speed motors are adjusted, so that all the lenses of the panoramic camera 2 can completely and clearly shoot the turntable 11, the pointer 12 and the angle scale 13 through the plane mirrors. The plane mirror, the motor 10, and the number of rotations of the motor 10 and the orientation of the panoramic camera 2 are fixed. And then, the rotating speed of the motor 10 is regulated, so that the sector smear angle of the pointer 12 of the turntable 11 in the images shot by all the lens modules of the panoramic camera 2 is smaller than 360 degrees. To improve the accuracy of the test results, the angle of the fan-shaped smear is preferably greater than 180 degrees and less than 360 degrees.
After the rotation speed of the motor 10 is adjusted, the panoramic camera 2 is used for shooting an image, or a small video is recorded, and in the video recorded by each lens, one frame of image is taken out at the same position, for example, the 200 th frame is taken. And then recording the rotation circle value of the motor 10 shot by each lens module and the initial position of the sector smear of the pointer 12 of the turntable 11, and determining the initial exposure time of the lens with the exposure time to be detected, so as to calculate the initial exposure time difference of the frames of the modules to be detected of the panoramic camera 2.
In the image shot by one lens module, the scale values of the initial position and the end position of the sector-shaped smear of the pointer 12 are respectivelyAnd->The corresponding motor displays the number of turns N 1 And N 2 (since the fan angle is less than 360 degrees, N 1 And N 2 Equal or differing by only 1), the rotational speed of the turntable has a value n.
The number of turns of the motor, namely the number of turns of the turntable, the initial position of the pointer sector smear and the exposure starting time of K lenses of the panoramic camera are respectively recorded as t s1 、t s2 、t s3 、……、t sK The calculation formula of the exposure starting time of each lens module is as follows:
……
average exposure time start timeThe calculation formula of (2) is as follows:
the exposure start time deviation deltat of each lens module s1 、Δt s2 、Δt s3 、......、Δt sK The method comprises the following steps:
……
in the present embodiment, the determination unit 6 may determine the initial exposure times t for the K shots of the panoramic camera s1 、t s2 、t s3 、……、t sK Initial exposure of any (but 1, two, more or all) of the lenses of the exposure time to be measuredAnd if the difference between the time and the starting time of the average exposure time is within a preset range, determining that the frames of the lenses for measuring the exposure time to be measured are synchronous. For example, the determining unit is further configured to determine that, in the obtained initial exposure times of the shots of all exposure times to be measured, a difference between each initial exposure time and the starting time of the average exposure time is within the preset range, and determine that frames of the shots of all exposure times to be measured are synchronous. That is, the initial exposure time t of K lenses of the panoramic camera s1 、t s2 、t s3 、……、t sK And if the difference value between each initial exposure time and the starting time of the average exposure time is within the preset range, determining that the frames of the lenses for measuring all the exposure times to be measured are synchronous.
Optionally, the determining unit is further configured to determine a maximum value of all differences between each of the obtained starting exposure times and the average exposure time starting time, and determine that the maximum value is within a target range, where the lens of the plurality of exposure times to be tested or the lens of all exposure times to be tested is frame-synchronized.
For example, the exposure start time deviation Δt is used s1 、Δt s2 、Δt s3 、……、Δt sK The value deltat with the largest intermediate difference (offset) smax To evaluate the quality of frame synchronization. When Deltat smax The smaller the description frame sync is made the better; conversely, when Δt smax The larger the frame sync, the worse the frame sync will be made.
In the scheme, the problem that the frame synchronization test of the panoramic camera multi-lens module cannot be tested in the prior art is solved by imaging the turntable 11 through the shooting plane mirror.
Optionally, the panoramic camera 2 includes two or more optical lenses.
Optionally, the panoramic camera 2 includes four fisheye optical lenses, the four fisheye optical lenses are distributed on four panels of the panoramic camera 2 in a one-to-one correspondence manner, the four fisheye optical lenses are located on the same horizontal plane, and each panel is provided with a physical shooting button or a touch screen shooting control for controlling the corresponding distributed fisheye optical lenses to shoot.
Optionally, the testing device further includes a turntable sleeve, the outer periphery of the turntable sleeve is provided with the 360-degree angle scale 13, and the turntable 11 is sleeved with the turntable sleeve, so that the outer periphery of one surface of the turntable 11, on which the pointer 12 is fixed, is fixedly provided with the 360-degree angle scale 13.
Optionally, the testing device further includes an angle scale fixing piece, and the 360-degree angle scale 13 is fixedly connected to the periphery of one surface of the pointer 12 by the angle scale fixing piece, where the periphery of one surface of the pointer 12 is fixed by the turntable 11.
Optionally, the motor 10 is a constant-speed rotation motor 10, and a rotating shaft of the motor 10 is correspondingly installed at the center of the turntable 11.
Optionally, the color difference between the surface of the turntable 11 where the pointer 12 is arranged and the surface of the pointer 12 facing away from the turntable 11 is greater than a preset value.
Optionally, one end of the pointer 12 pointing to the periphery of the turntable 11 is an isosceles triangle, and a vertex angle of the isosceles triangle of one end of the pointer 12 pointing to the periphery of the turntable 11 falls on the periphery of the turntable 11.
Optionally, an end of the pointer 12 facing the center of the turntable 11 is an isosceles triangle, and a vertex angle of the isosceles triangle at an end of the pointer 12 facing the center of the turntable 11 falls on the center of the turntable 11.
Optionally, the diameter of the turntable 11 is greater than 10cm.
Optionally, the diameter of the angle scale 13 is greater than 10cm.
Optionally, the turntable 11 is a circular turntable, and the pointer 12 has a length equal to a radius of the circular turntable.
Optionally, the surface of the turntable 11, on which the pointer 12 is arranged, is white, and the surface of the pointer 12 facing away from the turntable 11 is black.
Optionally, the base lengths of all isosceles triangles are greater than or equal to 3 times the pointer width.
Optionally, all isosceles triangles are equilateral triangles.
From the above technical solutions, the embodiment of the present application has the following advantages:
the embodiment of the application provides a multi-lens frame synchronization system for testing a panoramic camera, which comprises the following steps: the device comprises a testing device 1, a panoramic camera 2 and a plurality of testing mirrors 33, wherein the number of the testing mirrors 33 is the same as that of at least two lenses of the panoramic camera 2, the testing mirrors 3 are used for imaging the turntable 11 facing the testing mirrors 3, and the lenses of all the lenses of the panoramic camera 2, the lenses of which are to be tested, are arranged opposite to the plurality of testing mirrors 3 in a one-to-one correspondence manner; the testing device 1 comprises a rotary table 11 with a motor 10, wherein a pointer 12 is fixed at the center of the rotary table 11, an angle scale 13 of 360 degrees is arranged on the periphery of one surface of the rotary table 11, which is fixed with the pointer 12, and the center of the angle scale 13 of 360 degrees is concentric with the center of the rotary table 11; a control unit 5 that controls a lens of the exposure time to be measured in the panoramic camera 2 to shoot image data including the pointer 12, the dial 11, and the angle scale 13 imaged in the test mirror 3 corresponding to the lens of the exposure time to be measured when the dial 11 rotates according to a predetermined rotation speed of the motor 10; determining the initial exposure time of the lens with the exposure time to be tested according to the fan-shaped smear of the pointer shot in the image data, determining the average exposure time starting time of the initial exposure time of all the obtained lenses with the exposure time to be tested, determining that the difference value between the initial exposure time of any lens with the exposure time to be tested and the average exposure time starting time is in a preset range, and determining that the frames of the lenses with the exposure time to be tested are synchronous. The test system provides a brand-new frame synchronization detection scheme of the multi-lens module in the panoramic camera field. In addition, the synchronous detection scheme of the exposure time has the advantages of simple layout, high flexibility, simple system, small system building difficulty, easy and convenient maintenance and easy replacement of parts to be maintained. In addition, in the present embodiment, the accuracy of the exposure time detection technique is high, and thus the accuracy of the frame synchronization detection result is high.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing system embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and system may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the system according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A system for testing panoramic camera multi-shot frame synchronization, the system comprising: the device comprises a testing device, a panoramic camera and a plurality of testing mirrors, wherein the number of the testing mirrors is the same as that of at least two lenses of the panoramic camera, the lenses are used for exposure time to be tested, the testing device comprises a turntable with a motor, a pointer is fixed at the center of the turntable, an angle scale of 360 degrees is arranged on the periphery of one surface of the turntable, where the pointer is fixed, and the center of the angle scale of 360 degrees is concentric with the center of the turntable;
a control unit that controls a lens of the exposure time to be measured in the panoramic camera to capture image data including the pointer, the dial, and the angle scale imaged in the mirror corresponding to the lens of the exposure time to be measured when the dial is rotated according to a predetermined rotational speed of the motor;
the determining unit is used for determining the initial exposure time of the lens with the exposure time to be detected according to the fan-shaped smear of the pointer shot in the image data, determining the average exposure time starting time of the initial exposure time of all the acquired lenses with the exposure time to be detected, determining that the difference value between the initial exposure time of any lens with the exposure time to be detected and the average exposure time starting time is in a preset range, and determining that the frames of the lenses with the exposure time to be detected are synchronous.
2. The system of claim 1, wherein the control unit is built in the panoramic camera, and after receiving an operation instruction of a user, the control unit sends a control instruction to a lens module of an exposure time to be tested in the panoramic camera, and the lens module controls a lens of the exposure time to be tested to shoot image data imaged in the test mirror corresponding to the lens of the exposure time to be tested.
3. The system of claim 1, wherein the control unit is externally arranged on the panoramic camera, is in remote communication with the panoramic camera or is connected through a communication interface, and after receiving an operation instruction of a user, the control unit sends a control instruction to a lens module of exposure time to be tested in the panoramic camera, and the lens module controls a corresponding lens of exposure time to be tested to shoot image data imaged in the test mirror corresponding to the lens of exposure time to be tested.
4. The system of claim 1, wherein the motor is a motor having a display of the number of rotations; the image data includes the pointer, the dial and the angle scale, and the number of rotations of the motor.
5. The system according to claim 1, wherein the determining unit is further configured to, when the image data is video data, select a sector smear of the pointer captured in a frame picture of a same frame position in the video data captured by each lens of the exposure time to be measured, and determine a start exposure time of the lens of the exposure time to be measured.
6. The system of claim 1, wherein the panoramic camera comprises two or more optical lenses.
7. The system of claim 1, wherein the panoramic camera comprises four fisheye optical lenses, the four fisheye optical lenses are distributed on four panels of the panoramic camera in a one-to-one correspondence, the four fisheye optical lenses are in the same horizontal plane, and each panel is provided with a physical shooting button or a touch screen shooting control for controlling the correspondingly distributed fisheye optical lenses to shoot.
8. The system of claim 1, wherein the determination unit is internal to the panoramic camera; or the determining unit is arranged outside the panoramic camera and is in remote communication with the panoramic camera or connected through a communication interface; or, the determining unit is built in the control unit or replaced by the control unit to realize the function of the determining unit.
9. The system according to claim 1, wherein the determining unit is further configured to determine a maximum value of all differences between each of the obtained start exposure times and the average exposure time start time among a plurality of or all start exposure times of the shots of all exposure times to be measured, and determine that the shots of the plurality of shot exposure times or the shots of all exposure times to be measured among the start exposure times of the shots of all exposure times to be measured are frame-synchronized if the maximum value is determined to be within a target range.
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| US6738073B2 (en) * | 1999-05-12 | 2004-05-18 | Imove, Inc. | Camera system with both a wide angle view and a high resolution view |
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| US7999842B1 (en) * | 2004-05-28 | 2011-08-16 | Ricoh Co., Ltd. | Continuously rotating video camera, method and user interface for using the same |
| CN106657983A (en) * | 2016-11-16 | 2017-05-10 | 深圳六滴科技有限公司 | Parameter test method and device for panoramic camera |
| CN107800979A (en) * | 2017-10-23 | 2018-03-13 | 深圳看到科技有限公司 | High dynamic range video image pickup method and filming apparatus |
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