CN111711764A - Method, apparatus, device and medium for determining focus position - Google Patents
Method, apparatus, device and medium for determining focus position Download PDFInfo
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- CN111711764A CN111711764A CN202010828846.XA CN202010828846A CN111711764A CN 111711764 A CN111711764 A CN 111711764A CN 202010828846 A CN202010828846 A CN 202010828846A CN 111711764 A CN111711764 A CN 111711764A
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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
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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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
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/675—Focus control based on electronic image sensor signals comprising setting of focusing regions
Abstract
The embodiment of the invention discloses a method, a device, equipment and a medium for determining a focusing position. Wherein, the method comprises the following steps: determining an initial search step length of an image to be shot according to the moving range of the stepping motor; if the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, determining the current search step length and the search range of the image to be shot according to the initial search step length; and determining the focusing position of the camera lens according to the current search step length and the search range. According to the embodiment of the invention, the searching step length and the searching range are adjusted in real time in the focusing process, so that the problems of time consumption and low searching accuracy caused by small step length searching are solved; the method greatly reduces the searching time from the camera lens to the gathering position and effectively improves the focusing precision.
Description
Technical Field
The embodiment of the invention relates to an automatic focusing technology, in particular to a method, a device, equipment and a medium for determining a focusing position.
Background
The focusing technology is an important means for improving the measurement accuracy of the camera, especially in the measurement with small depth of field and high accuracy. Cameras are widely used in industrial and intelligent equipment, the camera is in a focusing state and is an important means for acquiring a clear image, but the camera easily loses focus at the moment of acquiring an image, so that the image blurring influences the significance of acquiring the image. The existing focusing means is mainly realized by small-step hill climbing search, specifically, in a search range, fixed small steps are adopted for searching and calculating a focusing value, and when the focusing value at the current moment is detected to be smaller than the focusing value at the previous moment, the searching position at the previous moment is used as the focusing position of the camera.
The defects of the scheme are as follows: in the searching process, the step length is short and is fixed and unchangeable, so that the time consumption of the searching process is longer, and the time for moving the camera lens to the focusing position is greatly increased; and the focusing position is only roughly obtained through the focusing values at two connected moments, and the accuracy of the focusing position is low.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a medium for determining a focusing position, which can adjust a search step length and a search range in a focusing process, greatly reduce the search time from a camera lens to the focusing position and effectively improve the focusing precision.
In a first aspect, an embodiment of the present invention provides a method for determining a focus position, including:
determining an initial search step length of an image to be shot according to the moving range of the stepping motor;
if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected, determining the current search step length and the search range of the image to be shot according to the initial search step length;
and determining the focusing position of the camera lens according to the current searching step length and the searching range.
Optionally, determining the current search step length of the image to be shot according to the initial search step length includes:
and taking the ratio of the initial search step length to a preset conversion value as the current search step length of the image to be shot.
Optionally, determining a search range of the image to be captured according to the initial search step length includes:
moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position;
and taking the search range between the target search position and the current search position as the search range of the image to be shot.
Optionally, determining a focusing position of the camera lens according to the current search step length and the search range includes:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
In a second aspect, an embodiment of the present invention provides an apparatus for determining a focus position, including:
the determining module is used for determining the initial searching step length of the image to be shot according to the moving range of the stepping motor;
the detection module is used for determining the current search step length and the search range of the image to be shot according to the initial search step length if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected;
and the determining module is further used for determining the focusing position of the camera lens according to the current searching step length and the searching range.
Optionally, the detection module is specifically configured to:
and taking the ratio of the initial search step length to a preset conversion value as the current search step length of the image to be shot.
Optionally, the detection module is further specifically configured to:
moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position;
and taking the search range between the target search position and the current search position as the search range of the image to be shot.
Optionally, the determining module is specifically configured to:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method for determining a focus position according to any one of the embodiments of the present invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for determining a focus position according to any one of the embodiments of the present invention.
According to the embodiment of the invention, the initial search step length of the image to be shot is determined according to the moving range of the stepping motor; if the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, determining the current search step length and the search range of the image to be shot according to the initial search step length; and determining the focusing position of the camera lens according to the current search step length and the search range. According to the embodiment of the invention, the searching step length and the searching range are adjusted in real time in the focusing process, so that the problems of time consumption and low searching accuracy caused by small step length searching are solved; the method greatly reduces the searching time from the camera lens to the gathering position and effectively improves the focusing precision.
Drawings
FIG. 1 is a flowchart illustrating a method for determining a focus position according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for determining a focus position according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a focusing position determining apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device in a fourth embodiment of the present invention;
fig. 5 is a schematic view of a step motor searching for an image to be captured in the second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart illustrating a method for determining a focus position according to a first embodiment of the present invention. The embodiment can be suitable for the condition of quickly and accurately searching out the focusing position of the image to be shot. The method of the present embodiment may be performed by a focusing position determining apparatus, which may be implemented in hardware and/or software and may be configured in an electronic device. The method for determining the focus position according to any of the embodiments of the present application can be implemented. As shown in fig. 1, the method specifically includes the following steps:
and S110, determining the initial search step length of the image to be shot according to the moving range of the stepping motor.
In the present embodiment, the stepping motor is a control element that controls the movement of the acquisition device, and the movable range of the stepping motor of each device is fixed; wherein the acquisition device may comprise a single lens reflex camera. In this embodiment, if the mobile phone is selected as the acquisition device, when the image is shot through the mobile phone camera, the initial search step length of the image to be shot can be determined according to the voice coil motor.
Determining an initial search step length of an image to be shot according to the moving range of the stepping motor, wherein the step length comprises the following steps: the moving range of the stepping motor is uniformly divided into a plurality of equal parts (such as five equal parts or seven equal parts), and the length of each equal part is the initial search step length of the image to be shot. The movable range of the stepping motor is measured in millimeters, for example, in a common case, the movable range of the stepping motor of one acquisition device is 5 millimeters; if the moving range of the stepping motor is divided into five equal parts, the initial searching step length of the image to be shot is 1 mm.
S120, detecting whether the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment; if yes, go to S130; if not, the process continues to S120.
In this embodiment, the focus value is a variance value of the image to be photographed, the definition of the image to be photographed can be accurately evaluated, and the focus value can be calculated according to each pixel value and the pixel average value included in the image to be photographed; if it is detected that the focus value of the image to be photographed at the current moment is smaller than the focus value of the image to be photographed at the previous moment, the current initial search step length needs to be adjusted, that is, S130 is executed; if the fact that the focus value of the image to be shot at the current moment is not smaller than the focus value of the image to be shot at the previous moment is not detected, the loop is executed to the step S120 continuously until whether the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected.
S130, if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected, determining the current search step length and the search range of the image to be shot according to the initial search step length.
Because the focusing position of the image is traditionally determined by gradually searching each position point in the searching range through a fixed small step length, when the focusing value of the image to be shot at the current moment is detected to be smaller than the focusing value of the image to be shot at the previous moment, the position of the stepping motor at the previous moment is taken as the focusing position of the image to be shot; the whole searching process adopts invariable small step size searching, so that a larger searching time is needed to be consumed when the focusing position is searched, and the accuracy of the determined focusing position is lower.
In the embodiment, the focusing position is determined by adopting a variable step size searching mode, so that the problems of time consumption and low searching accuracy caused by small fixed step size searching can be effectively solved. Not only has reduced the search step length in this embodiment, still has reduced the search range that step motor treated the image of shooing according to the testing result, through search step length and search range of constantly shortening in the search process, reach the more careful and accurate search of treating the image of shooing, also removed the problem of searching always in unnecessary search range simultaneously from, effectively saved search time, and improved search efficiency.
And S140, determining the focusing position of the camera lens according to the current searching step length and the searching range.
In this embodiment, the current search step is the search step of the stepping motor at the current time, and the search step of the stepping motor at the current time is shorter than the search step of the stepping motor at the previous time; and the searching range is also sequentially shortened on the basis of the fixed moving range of the stepping motor, and the searching of the stepping motor is finished until the searching step length in the searching process meets the searching requirement, and the current searching position of the stepping motor is used as the focusing position of the camera lens.
According to the embodiment of the invention, the initial search step length of the image to be shot is determined according to the moving range of the stepping motor; if the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, determining the current search step length and the search range of the image to be shot according to the initial search step length; and determining the focusing position of the camera lens according to the current search step length and the search range. According to the embodiment of the invention, the searching step length and the searching range are adjusted in real time in the focusing process, so that the problems of time consumption and low searching accuracy caused by small step length searching are solved; the method greatly reduces the searching time from the camera lens to the gathering position and effectively improves the focusing precision.
Example two
Fig. 2 is a flowchart illustrating a method for determining a focus position according to a second embodiment of the present invention. The embodiment is further expanded and optimized on the basis of the embodiment, and can be combined with any optional alternative in the technical scheme. As shown in fig. 2, the method includes:
s210, determining the initial search step length of the image to be shot according to the moving range of the stepping motor.
S220, detecting whether the focus value of the image to be shot at the current moment is smaller than that of the image to be shot at the previous moment; if yes, go to S230; if not, the process continues to step S220.
In this embodiment, the focus value is a variance value of the image to be photographed, the definition of the image to be photographed can be accurately evaluated, and the focus value can be calculated according to each pixel value and the pixel average value included in the image to be photographed; if the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, the current initial search step length needs to be adjusted, namely S230 is executed; if the fact that the focus value of the image to be shot at the current moment is not smaller than the focus value of the image to be shot at the previous moment is not detected, the step S220 is continuously executed in a circulating mode until whether the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected.
And S230, if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected, taking the ratio of the initial search step length to the preset conversion value as the current search step length of the image to be shot.
In the embodiment, the search step length is changed by formulating a fixed preset conversion value; here, the preset conversion value may be set to 2 or 3, etc. For example, in this embodiment, the movement range of the stepping motor of the acquisition device is 5 mm, and the movement range of the stepping motor is divided into 5 equal parts, so that the obtained initial search step length is 1 mm; and reducing the initial search step length through a preset conversion value, if the initial conversion value is selected to be 2, determining that the current search step length is 0.5 mm, and then continuously searching the image to be shot by using 0.5 mm as the search step length. According to the embodiment, the precision in the searching process can be effectively improved by reducing the searching step length in real time in the searching process.
S240, moving the current search position of the stepping motor to a target search position in opposite directions by two initial search steps; and taking the search range between the target search position and the current search position as the search range of the image to be shot.
In the embodiment, as the current search step length of the stepping motor is reduced, the search range is also adaptively adjusted; when detecting that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, indicating that the image passes through the focus position of the camera lens, and adjusting the search direction of the stepping motor to narrow the search range of the focus position; and in the determined current searching range, continuing searching according to the current searching step length. The embodiment of the invention greatly simplifies the searching workload in the searching process by adjusting the searching range in real time in the searching process.
FIG. 5 is a schematic view of a search for an image to be captured according to a stepper motor; wherein the abscissa represents the search time of the stepping motor, and the ordinate represents the focus value of the image to be photographed. When the focus value at the time t4 is smaller than the focus value corresponding to the time t3 in the searching process, indicating that the searching time of the focus position has passed, reversely adjusting the searching direction and reducing the searching range, for example, the searching range can be reduced to the range from the searching position at the time t2 to the searching position at the time t 4; the current search position is the position of the corresponding stepping motor at the time t 4; the target search position is the position of the corresponding stepping motor at time t 2.
And S250, determining the focusing position of the camera lens according to the current searching step length and the searching range.
When detecting that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment, the embodiment of the invention takes the ratio of the initial search step length to the preset conversion value as the current search step length of the image to be shot; moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position; and taking the search range between the target search position and the current search position as the search range of the image to be shot. The embodiment of the invention can convert the searching direction of the stepping motor after reducing the searching step length, thereby accurately determining the step length searching range of the focusing position.
Optionally, S250 includes:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
In this embodiment, after the new search step length and the search range are determined to continue searching, S230 and S240 need to be sequentially and repeatedly executed, and the size relationship between the current search step length and the preset step length threshold is determined in real time, until the current search step length is less than or equal to the preset step length threshold, the search process of the stepping motor is ended; and returning to the searching position of the stepping motor at the current moment, and taking the searching position as the focusing position of the camera lens; the preset step threshold is a unit motor step, that is, the minimum unit in which the stepping motor can move. According to the embodiment of the invention, the search cut-off condition of the search step length is set in the search process, and the search operation is finished when the cut-off condition is met, so that the search efficiency of the stepping motor can be effectively improved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a device for determining a focus position according to a third embodiment of the present invention, which is applicable to a case where a focus position of an image to be captured is quickly and accurately searched. The device is configured in an electronic device, and can realize the method for determining the focusing position according to any embodiment of the application. The device specifically comprises the following steps:
a determining module 310, configured to determine an initial search step length of an image to be captured according to a moving range of the stepping motor;
the detection module 320 is configured to determine a current search step length and a search range of the image to be captured according to the initial search step length if it is detected that the focus value of the image to be captured at the current time is smaller than the focus value of the image to be captured at the previous time;
the determining module 310 is further configured to determine a focusing position of the camera lens according to the current search step and the search range.
Optionally, the detecting module 320 is specifically configured to:
and taking the ratio of the initial search step length to a preset conversion value as the current search step length of the image to be shot.
Optionally, the detecting module 320 is further specifically configured to:
moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position;
and taking the search range between the target search position and the current search position as the search range of the image to be shot.
Optionally, the determining module 310 is specifically configured to:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
By the device for determining the focusing position, the searching step length and the searching range are adjusted in real time in the focusing process, and the problems of time consumption and low searching accuracy caused by small step length searching are solved; the method greatly reduces the searching time from the camera lens to the gathering position and effectively improves the focusing precision.
The device for determining the focusing position provided by the embodiment of the invention can execute the method for determining the focusing position provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention, as shown in fig. 4, the electronic device includes a processor 410, a memory 420, an input device 430, and an output device 440; the number of the processors 410 in the electronic device may be one or more, and one processor 410 is taken as an example in fig. 4; the processor 410, the memory 420, the input device 430 and the output device 440 in the electronic apparatus may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.
The memory 420 serves as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method of determining a focus position in the embodiment of the present invention. The processor 410 executes various functional applications and data processing of the electronic device by executing software programs, instructions and modules stored in the memory 420, that is, implements the method for determining the focus position provided by the embodiment of the present invention.
The memory 420 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 420 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 420 may further include memory located remotely from processor 410, which may be connected to an electronic device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 430 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic apparatus, and may include a keyboard, a mouse, and the like. The output device 440 may include a display device such as a display screen.
EXAMPLE five
The present embodiments provide a storage medium containing computer-executable instructions for implementing a method for determining a focus position provided by an embodiment of the present invention when executed by a computer processor.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the method for determining the focus position provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for determining a focus position, the method comprising:
determining an initial search step length of an image to be shot according to the moving range of the stepping motor;
if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected, determining the current search step length and the search range of the image to be shot according to the initial search step length;
and determining the focusing position of the camera lens according to the current searching step length and the searching range.
2. The method of claim 1, wherein determining the current search step size of the image to be captured according to the initial search step size comprises:
and taking the ratio of the initial search step length to a preset conversion value as the current search step length of the image to be shot.
3. The method of claim 1, wherein determining the search range of the image to be captured according to the initial search step comprises:
moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position;
and taking the search range between the target search position and the current search position as the search range of the image to be shot.
4. The method of claim 1, wherein determining the focus position of the camera lens according to the current search step and the search range comprises:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
5. An apparatus for determining a focus position, the apparatus comprising:
the determining module is used for determining the initial searching step length of the image to be shot according to the moving range of the stepping motor;
the detection module is used for determining the current search step length and the search range of the image to be shot according to the initial search step length if the fact that the focus value of the image to be shot at the current moment is smaller than the focus value of the image to be shot at the previous moment is detected;
and the determining module is further used for determining the focusing position of the camera lens according to the current searching step length and the searching range.
6. The apparatus according to claim 5, wherein the detection module is specifically configured to:
and taking the ratio of the initial search step length to a preset conversion value as the current search step length of the image to be shot.
7. The apparatus of claim 5, wherein the detection module is further specifically configured to:
moving the current search position of the stepping motor in opposite directions by two initial search steps to a target search position;
and taking the search range between the target search position and the current search position as the search range of the image to be shot.
8. The apparatus of claim 5, wherein the determining module is specifically configured to:
comparing the current search step length in the search range with a preset step length threshold value;
and if the current search step length is less than or equal to the preset step length threshold, taking the current search position of the stepping motor as the focusing position of the camera lens.
9. An electronic device, comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement a method of determining a focus position as claimed in any one of claims 1 to 4.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method of determining a focus position as claimed in any one of claims 1 to 4.
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