WO2017117750A1

WO2017117750A1 - Simple follow focus system based on multiple ranging approaches, and photographing system

Info

Publication number: WO2017117750A1
Application number: PCT/CN2016/070302
Authority: WO
Inventors: 徐红兵; 何景川; 甘乾良
Original assignee: 深圳市莫孚康技术有限公司
Priority date: 2016-01-06
Filing date: 2016-01-06
Publication date: 2017-07-13
Also published as: CN105917262A; CN105917262B

Abstract

The present invention provides a simple follow focus system based on multiple ranging approaches, for adjusting a focus of a photographing device. The system comprises a focus adjusting device and a ranging sensor, and further comprises a wireless ranging device. The wireless ranging device comprises a master wireless ranging module, at least one slave wireless ranging module, and a computing module. The distance between the master wireless ranging module and the photographing device is fixed, and the distance between the at least one slave wireless ranging module and a followed target is fixed. The technical solution provided in the present invention achieves automatic follow focus with low costs, thereby achieving more accurate follow focus.

Description

Simple multi-ranging range focusing system and shooting system

Technical field

The invention relates to the field of focus and communication, in particular to a focus tracking system and a shooting system of a plurality of simple ranging methods.

Background technique

In the process of radio, film and television shooting, as the distance between the focal plane of the camera and the actor (focus target) changes, it is necessary to constantly adjust the rotation angle of the lens FOCUS circle so that the focus of the camera is always maintained on the actor (focus target).

The existing simple focus tracking system includes a distance measuring sensor for measuring the distance between the focal plane of the camera and the actor; the distance measuring sensor is mounted on the camera; the motor for driving the rotation of the lens FOCUS circle; and the motor for driving the motor The motor driver; the ranging data output by the ranging sensor, the main controller prestores the lens data corresponding to the relationship between the rotation angle of the lens FOCUS circle and the lens scale; the lens scale is a set of distance data, when the camera focal plane and the actor When the distance between the two is equal to the current lens scale, the focus of the camera is on the actor.

In implementing the solution of the prior art, the prior art is found to have the following problems:

The simple focus gear device can not achieve effective tracking of the target, especially the moving target, and can not achieve effective tracking and focusing, resulting in blurred motion picture.

Summary of the invention

The invention provides a simple focus-receiving method of the focus-focusing system. The system adopts a plurality of test methods to perform a focus-focusing operation on the focus, so that it has the advantage of automatic focus-focusing.

In a first aspect, a focus tracking system of a simple plurality of ranging methods is provided, wherein the focus of the plurality of ranging methods adjusts a focus of the camera device, the system comprising: a focusing device and a ranging sensor; The system further includes: a wireless ranging device; the wireless ranging device includes: a wireless ranging main module, at least one wireless ranging slave module and a computing module; and a distance between the wireless ranging main module and the camera device is fixed At least one wireless ranging is fixed from the position of the module to the tracking target;

a distance measuring sensor, configured to measure a first distance between a focal plane of the camera device and a tracking target;

a calculating module, configured to calculate a second distance between the wireless ranging main module and the wireless ranging slave module according to a wireless signal transmission time between the wireless ranging main module and the wireless ranging slave module ;

The focusing device is configured to adjust the focus of the camera device according to the second distance if the distance difference between the first distance and the second distance is greater than or equal to the distance threshold.

Optionally, the focusing device is further configured to adjust a focus of the imaging device according to the first distance, if the distance difference between the first distance and the second distance is less than a distance threshold.

Optionally, the second distance L is calculated according to a preset formula, where the preset formula is specifically:

L=[(t3-t0)-(t2-t1)]*C/2;

Where t0 is the time when the wireless ranging main module sends the distance acquisition message, t3 is the time when the wireless ranging main module receives the response message of the distance acquisition message, and t2 is the time when the wireless ranging slave sends the response message, and t1 is the wireless The time when the ranging receives the distance acquisition message from the module, and C is the radio wave propagation speed.

In a second aspect, a photographing system is provided, the photographing system comprising a simple multiple ranging method of the focus follower system provided by the first aspect.

Optionally, the wireless ranging main module is fixedly mounted on the camera.

The technical solution provided by each embodiment has two sets of ranging systems, and the two sets of ranging systems cooperate with each other, and have the advantages of accurately pointing to an actor (target), capable of automatically focusing, and low cost.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural view of a focus tracking system of a plurality of simple ranging methods according to a first preferred embodiment of the present invention;

2 is a schematic structural view of a focusing system of various ranging methods according to a second preferred embodiment of the present invention;

FIG. 3 is a structural diagram of a photographing system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art without departing from the inventive scope are intended to be within the scope of the invention.

Referring to FIG. 1 , FIG. 1 is a focus of a plurality of ranging methods of a focus-receiving system in accordance with a first embodiment of the present invention. The focal point system 100 adjusts the focus of the camera device 103. As shown in FIG. 1, the wireless ranging device 101, the focusing device 102, and the ranging sensor 104 are included; wherein the ranging sensor 104 is fixedly disposed on the imaging device, and the wireless ranging device 101 may include: a wireless ranging main module 1011. At least one wireless ranging slave module 1012 and a computing module 1013; wherein the distance between the wireless ranging main module 1011 and the camera device 103 is fixed, and the distance between the position of the at least one wireless ranging slave module 1012 and the at least one tracking target is fixed. (ie, multiple wireless ranging slave modules need to correspond to multiple tracking target positions one by one);

The relative position of the above wireless ranging from the module to the actor (focus target) does not need to be strictly limited. If the actor's face needs to be in focus, the wireless ranging slave module can be placed in the jacket pocket or in the trouser pocket. Obviously, the distance from the focal plane of the camera to the face of the actor is not equal to the distance from the focal plane of the camera to the slave module. When the distance measuring sensor accurately points to the face, the ranging sensor outputs high-precision data according to the preset distance deviation. The parameter can calculate the distance difference between the camera focal plane and the actor's face and the slave module. After obtaining the distance difference, the distance value from the camera focal plane to the actor's face can be corrected in real time.

The distance measuring sensor 104 is configured to measure a first distance between the focal plane of the camera 103 and the tracking target;

The ranging sensor 104 may be specifically a laser ranging sensor or an ultrasonic ranging sensor. The manner in which the ranging sensor obtains the first distance may be in a manner of the prior art, and the first preferred embodiment of the present invention is used for the ranging. The manner in which the sensor obtains the first distance is not limited. Of course, in the actual application, the ranging sensor may also adopt other types of ranging sensors, and the specific preferred form of the above-mentioned ranging sensor is also used in the first preferred embodiment of the present invention. Not limited.

The calculation module 1013 is configured to calculate the wireless ranging main module 1011 and the wireless ranging slave module 1012 according to the wireless signal transmission time between the wireless ranging main module 1011 and the wireless ranging slave module 1012. The second distance between

The communication manner between the wireless ranging main module 1011 and the wireless ranging slave module 1012 may be a medium-and short-range wireless communication method, including but not limited to: ultra-wideband (English name: Ultra-wideband, UWB for short), WIFI, Bluetooth Or ZIGBEE, of course, in another embodiment of the first preferred embodiment of the present invention, other short-range wireless communication methods may be used, and the first preferred embodiment of the present invention does not limit the specific performance of the short-distance communication method. form. The representation of the distance acquisition message in the wireless ranging main module 1011 is not limited. The distance acquisition message may be a new message customized by the user. Of course, it may also be carried in the extended byte of the short-range wireless communication standard protocol. The present invention does not limit the specific expression of the above distance acquisition message.

The calculation module 1013 is specifically configured to: the wireless ranging main module sends a distance acquisition message to the wireless ranging slave module, and after receiving the distance acquisition message, the wireless ranging function sends a response message to the wireless ranging main module, where The distance L=[(t3-t0)-(t2-t1)]*C/2; wherein L is the second distance, t0 is the time when the wireless ranging main module sends the distance acquisition message, and t3 is the wireless ranging The time when the main module receives the response message, t2 is the time when the wireless ranging sends the response message from the module, t1 is the time when the wireless ranging receives the distance acquisition message from the module, and C can be the propagation speed, generally the speed of light; T2 and t1 may be carried in the response message. Of course, in the actual application, the response message may not carry t2 and t1, and the user may set the distance measurement module so that the difference of t2-t1 is a fixed value, for example, 0.1. s, of course, can also be other values, such as 0.2s.

The focusing device 102 is configured to adjust the focus of the imaging device 103 according to the second distance if the distance difference between the first distance and the second distance is greater than or equal to the distance threshold.

The implementation manner of adjusting the focus of the imaging device 103 according to the second distance may be specifically: calculating the adjusted distance L according to the second distance and the distance deviation (for example, increasing or decreasing the distance deviation at the second distance) According to the L key, the focus ring rotation angle corresponding to the L key is queried from the pre-stored distance and the focus circle rotation angle map list. The data stored in the above distance and focus circle rotation angle map list can be as follows: (L ₁ , θ ₁ ), (L ₂ , θ ₂ ).....(L _n , θ _n ), (L _n+1 , θ _n+1 ).....; L _n is the scale of the lens focus ring in the above stored data, which is a distance data. The meaning of this scale is when the focus ring of the lens is rotated to this scale, if the camera is focused The straight line distance between the plane and the focus object is equal to this scale, the focus object is accurately focused, and the image is clear; θ _n is the rotation angle of the lens, indicating the angle at which the lens focus ring rotates from the initial position to the current position and the lens focus ring rotates.

The main reason that the focusing device 102 adopts the focusing strategy is that after the wireless ranging device is added, two ranging data can be received (that is, the first distance and the second distance can be obtained), and one way is installed on the camera. The above-mentioned ranging sensor, that is, the first distance, generally a laser ranging sensor or an ultrasonic ranging sensor, has high ranging accuracy, but sometimes cannot accurately point to an actor (focus target); the other is wireless ranging, that is, the second distance The ranging accuracy is low, and when there is occlusion between the wireless ranging main module and the slave module, the ranging error is large, and the advantage is that the approximate second distance can always be output. Most of the wireless ranging data is used as reference data. When the distance between the laser ranging data and the wireless ranging data is within a certain range, it is considered that the ranging sensor on the camera accurately points to the actor (focus target) The laser ranging value and the lens data are used to control the rotation of the lens FOCUS circle. When the deviation between the laser ranging data and the wireless ranging data exceeds a certain range, it is considered that the ranging sensor on the camera does not accurately point to the actor (focus Target), using the second distance minus a distance offset value and lens data to control the lens FOCUS circle rotation.

Optionally, the focusing device 102 is further configured to adjust the focus of the imaging device 103 according to the first distance, if the distance difference between the first distance and the second distance is less than the distance threshold.

Such a setting is because the first distance detected by the ranging sensor is within the set range at this time, and the operation is normal at this time, so that the adjustment of the first distance can be directly used to adjust the focus of the imaging device 103 without adjustment.

The first preferred embodiment of the present invention achieves the adjustment of the focus by complementing the two kinds of ranging, and determines the ranging distance to adjust the focus according to the distance deviation acquired by the two types of ranging, so It has the ability to achieve motion tracking, and it does not require high requirements for photographers, because it has the advantage of low cost for the existing simple multi-ranging range focusing system, and the tracking task is added. On the photographer's body, the technical solution provided by the first preferred embodiment of the present invention realizes two ranging by two kinds of distance measuring devices. When the laser ranging is inaccurate (that is, when the tracking is not in place), the precision is poor. The wireless ranging can also achieve the focusing of the camera, thereby achieving the purpose of motion tracking.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a simple multiple ranging method of a focus tracking system according to a second preferred embodiment of the present invention. The system includes: laser ranging for measuring the distance between a focal plane of a camera and an actor. The sensor 10, the laser ranging sensor 10 and the camera are relatively fixed in position. When working, the distance measuring sensor points to the actor, and after adding a preset offset value, the distance between the focal plane of the camera and the actor can be calculated; An ultra-wideband ranging module for measuring distance, the module comprising an ultra-wideband ranging main module 11, one or more ultra-wideband slave modules, the main module and the camera are relatively fixed in position, and the slave module can be placed in the actor (focus target) Position; servo motor 14 for driving lens FOCUS, motor with encoder, real-time detection of motor rotation angle; motor driver 13 for driving motor; for receiving laser ranging sensor 10 and ultra-wideband ranging main module 11 The output of the ranging data, the main controller 12 of the control motor driver 13, the main controller pre-stores the lens data, the lens data is an array comprising a plurality of sets of lens FOCUS circle scales and rotation angles, and the lens FOCUS circle scale is a group Distance data,

It means that when the focal plane of the camera to the actor is consistent with the current FOCUS circle scale, the camera will focus accurately and the focus target image will be clear.

When the distance value output by the laser ranging sensor 10 and the distance value output by the ultra-wideband ranging main module 11 deviate by less than 1 meter (threshold value), it is considered that the laser ranging sensor 10 accurately points to the actor (focus target), and the laser ranging sensor is used. The distance value of the output is subtracted from a preset deviation, and the distance between the focal plane of the current camera and the actor can be calculated. According to the pre-stored lens data, the current camera focal plane and the actor can be calculated by using this example or the plot method. The distance corresponds to the rotation angle of the lens FOCUS circle, and the main controller 12 controls the motor to rotate to the corresponding angle, and the actor can accurately focus. At the same time, the distance between the focal plane of the current camera and the actor is saved and the output distance deviation of the ultra-wideband ranging main module 11 is saved.

When the distance value output by the laser ranging sensor 10 deviates from the distance value output by the ultra-wideband ranging main module 11 by more than 1 meter (threshold value), it is considered that the laser ranging sensor 10 does not point to the actor, and the current ultra-wideband ranging main module 11 is adopted. The distance value of the output minus the distance between the focal plane of the camera to the actor and the distance outputted by the UWB ranging main module 11 can calculate the distance between the focal plane of the current camera and the actor.

The above-mentioned system may specifically include: a wireless ranging device 101, a focusing device 102, and a ranging sensor 104; wherein the ranging sensor 104 is fixedly disposed on the imaging device, and the wireless ranging device 101 may include: a wireless ranging main module 1011; a wireless ranging slave module 1012 and a computing module 1013; wherein the distance between the wireless ranging main module 1011 and the camera device 103 is fixed, and the distance between the position of the module 1012 and the tracking target is fixed at least one wireless ranging;

The calculating module 1013 is configured to calculate a second distance between the wireless ranging main module 1011 and the wireless ranging slave module 1012 according to the wireless signal transmission time between the wireless ranging main module 1011 and the wireless ranging slave module 1012;

The calculation module 1013 is specifically configured to: the wireless ranging main module sends a distance acquisition message to the wireless ranging slave module, and after receiving the distance acquisition message, the wireless ranging function sends a response message to the wireless ranging main module, where The distance L=[(t3-t0)-(t2-t1)]*C/2; wherein L is the second distance, t0 is the time when the wireless ranging main module sends the distance acquisition message, and t3 is the wireless ranging The time when the main module receives the response message, t2 is the time when the wireless ranging sends the response message from the module, and t1 is the wireless measurement. The time at which the distance is received from the module, C can be the propagation speed, generally the speed of light; the above t2, t1 can be carried in the response message, of course, in the actual application, the response message may not carry t2, t1, the user The distance measurement module can be set such that the difference of t2-t1 is a fixed value, for example, 0.1 s, and of course, other values, such as 0.2 s, etc., can also be used.

The focusing device 102 is configured to adjust the focus of the imaging device 103 according to the first distance if the distance difference between the first distance and the second distance is less than the distance threshold.

The implementation manner of adjusting the focus of the imaging device according to the first distance may be: calculating the adjusted distance L1 according to the first distance and the distance deviation (for example, increasing or decreasing the distance deviation at the first distance); According to the L1 _{tone, the} focus ring rotation angle corresponding to the L1 _tone is queried from the pre-stored distance and the focus ring rotation angle map list. The data stored in the above distance and focus circle rotation angle map list can be as follows: (L ₁ , θ ₁ ), (L ₂ , θ ₂ ).....(L _n , θ _n ), (L _n+1 , θ _n+1 ).....; L _n is the scale of the lens focus ring in the above stored data, which is a distance data. The meaning of this scale is when the focus ring of the lens is rotated to this scale, if the camera is focused The linear distance between the plane and the in-focus object is equal to this scale. The focus is accurately focused and the image is clear. θ _n is the angle of rotation of the lens, indicating the angle at which the lens focus ring rotates from the initial position to the current position.

The technical solution provided by the second preferred embodiment of the present invention has the advantage that the focus can be adjusted by using the first distance in the case where the distance between the two distances is small, which has the advantage of accurate focusing. The above-mentioned system may specifically include: a wireless ranging device 101, a focusing device 102, and a ranging sensor 104; wherein the ranging sensor 104 is fixedly disposed on the imaging device, and the wireless ranging device 101 may include: a wireless ranging main module 1011; a wireless ranging slave module 1012 and a computing module 1013; wherein the distance between the wireless ranging main module 1011 and the camera device 103 is fixed, and the distance between the position of the module 1012 and the tracking target is fixed at least one wireless ranging;

The relative position of the above wireless ranging from the module to the actor (focus target) does not need to be strictly limited. If the actor's face needs to be in focus, the wireless ranging slave module can be placed in the jacket pocket or in the trouser pocket. Obviously, the distance from the focal plane of the camera to the face of the actor is not equal to the distance from the focal plane of the camera to the slave module. When the distance measuring sensor accurately points to the face, the ranging sensor outputs high-precision data according to the preset distance deviation. Parameters, which can calculate the camera focal plane to the actor's face and to the slave module The distance difference, after obtaining the distance difference, can correct the distance value of the camera focal plane to the actor's face in real time.

The communication manner between the wireless ranging main module 1011 and the wireless ranging slave module 1012 may be a medium-and short-range wireless communication method, including but not limited to: ultra-wideband (English name: Ultra-widcband, UWB for short), WIFI, Bluetooth Or ZIGBEE, of course, in another embodiment of the first preferred embodiment of the present invention, other short-range wireless communication methods may be used, and the first preferred embodiment of the present invention does not limit the specific performance of the short-distance communication method. form. The representation of the distance acquisition message in the wireless ranging main module 1011 is not limited. The distance acquisition message may be a new message customized by the user. Of course, it may also be carried in the extended byte of the short-range wireless communication standard protocol. The present invention does not limit the specific expression of the above distance acquisition message.

a focus-focusing focusing device 102 for adjusting the second distance according to the focus of the focus target The focus of the entire imaging device 103.

Adjusting a focusing device according to an implementation of the imaging apparatus of a second focus distance may be: _adjusted according to the distance L (e.g., increasing or decreasing the offset distance in the first distance) and the second distance calculated adjusted offset distance; basis the query is rotated from the _adjusting L L focus ring _tone corresponding to a pre-stored angle of focus ring rotation angle and the distance map list. The data stored in the above distance and focus circle rotation angle map list can be as follows: (L ₁ , θ ₁ ), (L ₂ , θ ₂ ).....(L _n , θ _n ), (L _n+1 , θ _n+1 ).....; L _n is the scale of the lens focus ring in the above stored data, which is a distance data. The meaning of this scale is when the focus ring of the lens is rotated to this scale, if the camera is focused The straight line distance between the plane and the focus object is equal to this scale, the focus object is accurately focused, and the image is clear; θ _n is the rotation angle of the lens, indicating the angle at which the lens focus ring rotates from the initial position to the current position and the lens focus ring rotates.

The technical solution provided by the third preferred embodiment of the present invention can focus through the second distance when the focus target image is blurred, so that the focus can be quickly achieved.

The embodiment of the present invention further provides a photographing system 400. As shown in FIG. 3, the photographing system 400 includes an image capturing device 103 and a focus-focusing system 100 based on a plurality of ranging methods. For a detailed structure of the system 100, reference may be made to the description of the first, second, and third preferred embodiments of the present invention.

Optionally, the wireless ranging main module 1011 is fixedly disposed on the imaging device.

It should be noted that, for the foregoing method embodiments or embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not subject to the described action sequence. Limitations, as certain steps may be performed in other sequences or concurrently in accordance with the present invention. In the following, those skilled in the art should also understand that the embodiments or examples described in the specification are preferred embodiments, and the actions and units involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

The steps in the method of the embodiment of the present invention may be sequentially adjusted, merged, and deleted according to actual needs.

The units in the apparatus of the embodiment of the present invention may be combined, divided, and deleted according to actual needs. Different embodiments described in this specification and features of different embodiments may be used by those skilled in the art. Combine or combine.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. For example, but not limited to, the computer readable medium may include a random access memory (RAM), a read-only memory (ROM), and an electrically erasable programmable read-only memory (Electrically Erasable Programmable). Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, disk storage media or other magnetic storage devices, or can be used to carry or store an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, Then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, wireless and microwave are included in the fixing of the associated medium. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A focus tracking system of a plurality of ranging methods, wherein the focusing system of the plurality of ranging methods adjusts a focus of the camera device, the system comprising: a focusing device and a ranging sensor; wherein The system further includes: a wireless ranging device; the wireless ranging device includes: a wireless ranging main module, at least one wireless ranging slave module and a computing module; and a distance between the wireless ranging main module and the camera device is fixed, At least one wireless ranging is fixed from the position of the module to the tracking target;

a distance measuring sensor for measuring a first distance between a focal plane of the imaging device and the tracking target;

a calculating module, configured to calculate a second distance between the wireless ranging main module and the wireless ranging slave module according to a wireless signal transmission time between the wireless ranging main module and the wireless ranging slave module ;

The focusing device is configured to adjust the focus of the camera device according to the second distance if the distance difference between the first distance and the second distance is greater than or equal to the distance threshold.
The system of claim 1 wherein:

The focusing device is further configured to adjust a focus of the imaging device according to the first distance if a distance difference between the first distance and the second distance is less than a distance threshold.
The system according to claim 1, wherein the second distance L is calculated according to a preset formula, and the preset formula is specifically:

L=[(t3-t0)-(t2-t1)]*C/2;

Where t0 is the time when the wireless ranging main module sends the distance acquisition message, t3 is the time when the wireless ranging main module receives the response message of the distance acquisition message, and t2 is the time when the wireless ranging slave sends the response message, and t1 is the wireless The time when the ranging receives the distance acquisition message from the module, and C is the radio wave propagation speed.
A photographing system, characterized in that the photographing system comprises an image pickup device and a simple multiple ranging method of the focus follower system according to any one of claims 1-4.
The photographing system according to claim 4, wherein the wireless ranging main module is fixedly mounted on the image pickup device.