WO2019242617A1

WO2019242617A1 - Determining device, photographing device, determining method, and program

Info

Publication number: WO2019242617A1
Application number: PCT/CN2019/091744
Authority: WO
Inventors: 永山佳范; 关范江
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2018-06-19
Filing date: 2019-06-18
Publication date: 2019-12-26
Also published as: JP2019219501A; CN111344631A; JP6561370B1

Abstract

The present invention further improves the processing precision of making an expected photographed body reach the position of a focus lens that is in a focus state. The determining device can comprise: a deriving part that derives a first contrast evaluation value of an image by using a first frequency component of the image, and derives a second contrast evaluation value of the image by using a second frequency component of the image; a detecting part that detects the peak values of respective multiple first contrast evaluation values of multiple images; a judging part that determines, when the detecting part detects the peak values of multiple first contrast evaluation values, whether the respective multiple second contrast evaluation values of the multiple images meet a predetermined condition; and a determining part that determines the position of the focus lens according to multiple second contrast evaluation values when the multiple second contrast evaluation values meet the predetermined condition.

Description

Determination device, imaging device, determination method, and program

Technical field

The invention relates to a determination device, an imaging device, a determination method and a program.

Background technique

Patent Document 1 describes that a defocus amount is corrected based on a spatial frequency component included in a subject image.

Japanese Patent Application Laid-Open No. 9-297259.

Summary of the Invention

It is desirable to further improve the accuracy of the process of determining the focus lens position that brings the desired subject into the in-focus state.

The determination device according to an aspect of the present invention may include an acquisition section that acquires an image captured by an imaging device including a focusing lens. The determination device may include a first filter section that passes a first frequency component of a spatial frequency component of the image. The determination device may include a second filter section that passes a second frequency component of a higher frequency band than the first frequency component of the spatial frequency component of the image. The determining device may include a deriving section that derives a first contrast evaluation value of the image using a first frequency component of the image, and derives a second contrast evaluation value of the image using a second frequency component of the image. The determination device may include a detection section that detects peaks of a plurality of first contrast evaluation values of each of the plurality of images. The determining device may include a determination section that, when a plurality of peaks of the first contrast evaluation values are detected by the detection section, determines whether the plurality of second contrast evaluation values of each of the plurality of images satisfy a predetermined condition. The determination device may include a determination section that determines the position of the focus lens based on the plurality of second contrast evaluation values when the plurality of second contrast evaluation values satisfy a predetermined condition.

When the plurality of second contrast evaluation values do not satisfy the predetermined condition, the determination section may determine the position of the focusing lens based on the plurality of first contrast evaluation values.

The detection unit may detect a plurality of peaks of the second contrast evaluation value. The predetermined condition may be that a plurality of peaks of the second contrast evaluation value are detected by the detection section.

The detection unit may detect a plurality of peaks of the second contrast evaluation value. The predetermined condition may be that a plurality of peak values of the second contrast evaluation values detected by the detection section are equal to or greater than a predetermined value.

The detection unit may detect a plurality of peaks of the second contrast evaluation value. The predetermined condition may be that peaks of the plurality of second contrast evaluation values detected by the detection section are greater than or equal to a predetermined value, and a difference between a maximum value and a minimum value of the plurality of second contrast evaluation values is greater than or equal to the predetermined difference.

The predetermined condition may be that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range.

The detection unit may detect a plurality of peaks of the second contrast evaluation value. The predetermined condition may be that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range, and The peak values of the two second contrast evaluation values are greater than or equal to a predetermined value, and the difference between the maximum value and the minimum value of the plurality of second contrast evaluation values is greater than or equal to the predetermined difference.

The imaging device according to an aspect of the present invention may include the above-mentioned determination device. The imaging device may include a focusing lens. The imaging device may include a control section that controls the position of the focus lens based on the position of the focus lens determined by the determination device.

The determination method according to an aspect of the present invention may include a stage of acquiring an image captured by an imaging device including a focusing lens. The determination method may include a stage of passing a first frequency component among the spatial frequency components of the image via the first filter section. The determination method may include a stage of passing a second frequency component of a higher frequency band than a first frequency component of a spatial frequency component of the image via a second filter. The determination method may include a stage of deriving a first contrast evaluation value of the image using a first frequency component of the image. The determination method may include a stage of deriving a second contrast evaluation value of the image using the second frequency component of the image. The determination method may include a step of detecting peaks of a plurality of first contrast evaluation values of each of the plurality of images. The determining method may include a stage of determining whether a plurality of second contrast evaluation values of each of the plurality of images satisfy a predetermined condition when a plurality of peaks of the first contrast evaluation values are detected in a detection stage. The determination method may include a stage of determining a position of the focus lens based on the plurality of second contrast evaluation values when the plurality of second contrast evaluation values satisfy a predetermined condition.

The program according to one aspect of the present invention may be a program for causing a computer to function as the determination device.

According to one aspect of the present invention, the accuracy of the process of determining the position of the focus lens can be further improved.

In addition, the above summary does not list all necessary features of the present invention. In addition, a sub-combination of these feature groups may also constitute an invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a functional block of the imaging device.

FIG. 2 is a diagram showing an example of functional blocks of an imaging control unit.

FIG. 3 is a diagram showing a relationship between a contrast evaluation value of each spatial frequency component and a position of a focus lens.

FIG. 4 is a flowchart illustrating an example of a process for determining a position of a focus lens for bringing a desired subject into an in-focus state.

FIG. 5 is a diagram for explaining an example of a hardware configuration.

detailed description

Hereinafter, the present invention will be described with embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Furthermore, not all feature combinations described in the embodiments are necessary for the inventive solution. It will be apparent to those skilled in the art that various changes or improvements can be added to the following embodiments. It is apparent from the description of the claims that the manner in which such a change or improvement is made may also be included in the technical scope of the present invention.

The claims, the description, the drawings, and the abstract include matters protected by copyright. Anyone who makes a copy of these documents as shown in the patent office's files or records will not dispute the copyright. However, in all other cases, all copyrights are reserved.

Various embodiments of the present invention may be described with reference to flowcharts and block diagrams. Here, a frame may represent (1) a stage of a process of performing an operation or (2) a "part" of a device having a role of performing an operation. The specified stages and "departments" may be implemented by programmable circuits and / or processors. The dedicated circuits may include digital and / or analog hardware circuits. It may include integrated circuits (ICs) and / or discrete circuits. Programmable circuits may include reconfigurable hardware circuits. Reconfigurable hardware circuits can include logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logical operations, flip-flops, registers, field programmable gate arrays (FPGAs), and programmable logic arrays (PLAs) ) And other memory elements.

Computer-readable media can include any tangible device capable of storing instructions for execution by a suitable device. As a result, a computer-readable medium having instructions stored thereon includes a product including instructions that can be executed to create a means for performing the operations specified by the flowchart or block diagram. As examples of the computer-readable medium, an electronic storage medium, a magnetic storage medium, an optical storage medium, an electromagnetic storage medium, a semiconductor storage medium, and the like may be included. As a more specific example of a computer-readable medium, a floppy disk (registered trademark), a floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory) may be included ), Electrically erasable programmable read-only memory (EEPROM), static random access memory (SRAM), compact disc read-only memory (CD-ROM), digital versatile disc (DVD), Blu-ray (RTM) disc, memory stick, IC cards, etc.

Computer-readable instructions may include any of source code or object code described by any combination of one or more programming languages. The source or object code includes traditional procedural programming languages. Traditional programming languages can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or Smalltalk, JAVA (registered trademark), C ++, etc. Object programming languages and "C" programming languages or similar programming languages. The computer-readable instructions may be provided to a processor or a programmable circuit of a general-purpose computer, a special-purpose computer, or other programmable data processing device locally or via a wide area network (WAN) such as a local area network (LAN) or the Internet. A processor or programmable circuit can execute computer-readable instructions to create a means for performing the operations specified in the flowchart or block diagram. Examples of the processor include a computer processor, a processing unit, a microprocessor, a digital signal processor, a controller, a microcontroller, and the like.

FIG. 1 illustrates an example of functional blocks of an imaging device 100 according to the present embodiment. The imaging device 100 includes an imaging section 102 and a lens section 200. The imaging section 102 includes an image sensor 120, an imaging control section 110, a memory 170, a display section 160, and an operation section 162.

The image sensor 120 may be composed of a CCD or a CMOS. The image sensor 120 converts an optical image imaged through the plurality of lenses 210 into an electric signal. The image sensor 120 outputs image data of an optical image formed by the plurality of lenses 210 to the imaging control section 110. The imaging control unit 110 may be composed of a microprocessor such as a CPU or an MPU, and a microcontroller such as an MCU. The imaging control unit 110 may control the imaging apparatus 100 according to an operation instruction from the control unit 162.

The memory 170 may be a computer-readable recording medium, and may include at least one of flash memories such as SRAM, DRAM, EPROM, EEPROM, and USB memory. The memory 170 stores programs and the like necessary for the imaging control unit 110 to control the image sensor 120 and the like. The memory 170 may be provided inside the casing of the imaging device 100. The memory 170 may be provided so as to be detachable from the casing of the imaging apparatus 100.

The display section 160 may display image data output from the image sensor 120. The display unit 160 can display various setting information of the imaging device 100. The display section 160 may be a liquid crystal display, a touch panel display, or the like. The display section 160 may include a plurality of liquid crystal displays or a touch panel display.

The lens unit 200 includes a plurality of lenses 210, a lens moving mechanism 212, and a lens control unit 220. The multiple lenses 210 can function as zoom lenses, varifocal lenses, and focusing lenses. At least a part or all of the plurality of lenses 210 are configured to be movable along the optical axis. The lens unit 200 may be an interchangeable lens provided to be detachable from the imaging unit 102. The lens moving mechanism 212 can move at least a part or all of the plurality of lenses 210 along the optical axis. The lens control section 220 drives the lens moving mechanism 212 according to a lens control instruction from the imaging section 102 to move one or more lenses 210 along the optical axis direction. The lens control command is, for example, a zoom control command and a focus control command.

The imaging apparatus 100 configured in this manner derives the peak value of the contrast evaluation value based on a plurality of contrast evaluation values of the focus lens at a plurality of positions, and determines the position of the focus lens that brings a desired subject into an in-focus state. That is, the imaging apparatus 100 determines the position of the focus lens that brings a desired subject into an in-focus state through contrast AF processing.

The imaging device 100 extracts a predetermined specific spatial frequency component from an image via a filter. Furthermore, the imaging device 100 determines the position of the focus lens that brings a desired subject into an in-focus state by deriving a peak of a contrast evaluation value of a specific spatial frequency component.

As a filter for extracting a specific spatial frequency component, for example, a band-pass filter composed of an infinite impulse response (IIR) filter is sometimes used. In such a band-pass filter, since it is easy to design and the like, a filter that passes relatively low spatial frequency components is often used. For example, the imaging device 100 determines the position of the focusing lens based on the contrast evaluation value of the spatial frequency component of 10 line pairs / mm. However, the position of the focus lens that is determined based on the contrast evaluation value of the relatively lower frequency component may not be the position of the focus lens that brings the desired subject into the in-focus state.

In addition, due to spherical aberration or coma aberration of the lens system of the imaging apparatus 100, the position of the focus lens that obtains the peak value of the contrast evaluation value and the position of the focus lens that obtains the focus state are not necessarily consistent. Therefore, the imaging device 100 corrects the position of the focus lens that obtains the peak value of the contrast evaluation value, and determines the position of the focus lens that is expected to bring a desired subject into an in-focus state. For example, the imaging apparatus 100 determines a position obtained by adding or subtracting a position of a focus lens that obtains a peak value of a contrast evaluation value with a predetermined correction amount as a position of the focus lens. However, such a correction amount is not necessarily the best correction amount for all subjects.

As described above, the positional accuracy of the focus lens determined by the contrast AF process may be biased. Therefore, the imaging device 100 according to the present embodiment further improves the accuracy of the process of determining the focus lens position for bringing a desired subject into a focused state.

FIG. 2 is an example of functional blocks of the imaging control unit 110 according to the present embodiment. The imaging control unit 110 includes an acquisition unit 111, a first filter unit 112, a second filter unit 113, a derivation unit 114, a detection unit 115, a determination unit 116, and a determination unit 117.

The acquisition unit 111 acquires an image captured by the imaging device 100. The acquisition section 111 can acquire RAW data output from the image sensor 120. The first filter unit 112 passes a first frequency component among the spatial frequency components of the image. The second filter unit 113 passes a second frequency component of a higher frequency band than the first frequency component of the spatial frequency component of the image. The first filter section 112 and the second filter section 113 may be band-pass filters made of IIR filters.

The second filter unit 113 can pass a spatial frequency component corresponding to the resolution of the imaging device 100. The second filter section 113 can pass a spatial frequency component corresponding to a limit spatial frequency component which can obtain a predetermined contrast depending on the optical characteristics of the lens section 200 and the image sensor 120. The second filter unit 113 can pass a spatial frequency component of 40 line pairs / mm from the image, for example. The first filter section 112 can pass a spatial frequency component corresponding to a limit spatial frequency component obtained from a live view image displayed on the display section 160 of the imaging device 100. The first filter unit 112 can pass a spatial frequency component of 10 line pairs / mm from the image, for example.

The deriving unit 114 may derive a first contrast evaluation value of the image using the first frequency component of the image. The derivation unit 114 may use the second frequency component of the image to derive a second contrast evaluation value of the image.

The detection unit 115 detects peaks of a plurality of first contrast evaluation values of a plurality of images. The detection unit 115 detects peaks of a plurality of first contrast evaluation values of a plurality of images captured by the imaging device 100 at a plurality of positions of the focus lens. The detection unit 115 may detect a plurality of peaks of the first contrast evaluation values by a so-called mountain climbing method. The detection section 115 may detect a plurality of second contrast evaluation values of each of the plurality of images. The detection unit 115 detects peaks of a plurality of second contrast evaluation values of each of a plurality of images captured by the imaging device 100 at a plurality of positions of the focus lens. The detection section 115 may detect a plurality of peaks of the second contrast evaluation value by a so-called mountain climbing method. The detection section 115 may detect a peak of the first contrast evaluation value from a curve 500 obtained from a plurality of first contrast evaluation values as shown in FIG. 3. In addition, the detection section 115 may detect a peak value of the second contrast evaluation value from a curve 502 obtained from a plurality of second contrast evaluation values as shown in FIG. 3.

Here, the second frequency component is a relatively high spatial frequency component. Contrast evaluation values of relatively high spatial frequency components tend to have relatively steep peaks. Contrast estimates of relatively high spatial frequency components sometimes contain a lot of noise. The position of the focusing lens determined based on the peak of the contrast evaluation value of the relatively high spatial frequency component is sometimes more accurate than the position of the focusing lens determined based on the peak of the contrast evaluation value of the relatively low spatial frequency component . On the other hand, depending on the subject, the position of the focusing lens determined based on the peak value of the contrast evaluation value of the relatively high spatial frequency component and the peak value of the contrast evaluation value based on the relatively low spatial frequency component Compared to the position of the focusing lens, the accuracy is sometimes lower.

Thus, when the peaks of the plurality of first contrast evaluation values are detected by the detection section 115, the determination section 116 determines whether the plurality of second contrast evaluation values of each of the plurality of images satisfy a predetermined condition. The predetermined condition may be determined according to an index indicating the reliability of the second contrast evaluation value.

For example, the predetermined condition may be that a plurality of peaks of the second contrast evaluation value are detected by the detection section 115. The predetermined condition may be that a plurality of peak values of the second contrast evaluation values detected by the detection section 115 are equal to or greater than a predetermined value. The predetermined condition may be that peaks of the plurality of second contrast evaluation values detected by the detection section 115 are greater than or equal to a predetermined value, and a difference between a maximum value and a minimum value of the plurality of second contrast evaluation values is greater than or equal to the predetermined difference. The predetermined condition may be that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range. The predetermined condition may be that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range, and is detected by the detection unit 115. The peak values of the plurality of second contrast evaluation values are greater than or equal to a predetermined value, and the difference between the maximum value and the minimum value of the plurality of second contrast evaluation values is greater than or equal to a predetermined difference.

When the plurality of second contrast evaluation values satisfy a predetermined condition, the position of the focusing lens based on the plurality of second contrast evaluation values has high reliability. Therefore, in this embodiment, the determination unit 117 determines whether to select the first contrast evaluation value or the second contrast evaluation value according to whether or not the plurality of second contrast evaluation values satisfy a predetermined condition as the position for determining the focus lens. Reference contrast evaluation value. That is, when the plurality of second contrast evaluation values satisfy a predetermined condition, the determination section 117 may determine the position of the focus lens based on the plurality of second contrast evaluation values. When the plurality of second contrast evaluation values do not satisfy the predetermined condition, the determination section 117 may determine the position of the focus lens based on the plurality of first contrast evaluation values.

The imaging control section 110 may output a driving instruction of the focus lens to the lens control section 220 so as to move the focus lens to the position of the focus lens determined by the determination section 117. The lens control section 220 may move the lens 210 serving as the focus lens to the position of the focus lens determined by the determination section 117 via the lens moving mechanism 212.

As described above, the respective contrast evaluation values of different spatial frequency components are derived, and the position of the focusing lens is determined based on the contrast evaluation values of the spatial frequency components with relatively high reliability. Thereby, the accuracy of the process of determining the position of the focus lens can be further improved.

FIG. 4 is a flowchart showing an example of a routine for determining a position of a focus lens for bringing a desired subject into an in-focus state.

When the autofocus processing is performed, the imaging control section 110 instructs the lens control section 220 to move the focus lens by a predetermined movement amount (S100). After the focus lens is moved by a predetermined amount of movement, the acquisition section 111 acquires an image captured by the imaging device 100 (S102). The acquisition section 111 can acquire RAW data output from the image sensor 120 as an image.

The first filter section 112 extracts a first frequency component of an image (S104). The deriving unit 114 derives a contrast evaluation value of the first frequency component of the image (S106). The second filter section 113 extracts a second frequency component of the image (S108). The deriving unit 114 derives a contrast evaluation value of the second frequency component of the image (S110).

The detection unit 115 sequentially detects the peaks of the contrast evaluation values based on the contrast evaluation value of the first frequency component of the image in accordance with the mountain climbing method. The detection unit 115 sequentially detects the peaks of the contrast evaluation values based on the contrast evaluation value of the first frequency component of the image in accordance with the mountain climbing method.

The imaging control unit 110 determines whether the detection unit 115 has detected the peak of the contrast evaluation value of the first frequency component of the image (S112). If the detection section 115 fails to detect the peak of the contrast evaluation value of the first frequency component of the image, the imaging control section 110 repeats the processing from step S100.

If the detection unit 115 detects a peak value of the contrast evaluation value of the first frequency component of the image, the derivation unit 114 stops deriving the contrast evaluation value of the second frequency component of the image (S114). The determination section 116 determines whether the contrast evaluation value of the second frequency component satisfies a predetermined condition (S116). For example, when the difference between the position of the focus lens determined based on the plurality of first contrast evaluation values and the position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range, the plurality of When the peak value of the second contrast evaluation value is greater than or equal to the predetermined value, and the difference between the maximum value and the minimum value of the plurality of second contrast evaluation values is greater than or equal to the predetermined difference, the determination unit 116 determines that the contrast evaluation value of the second frequency component satisfies a predetermined value. condition.

When the contrast evaluation value of the second frequency component satisfies a predetermined condition, the determination section 117 determines a position of a focus lens that brings a desired subject into an in-focus state based on the plurality of second contrast evaluation values (S118). When the contrast evaluation value of the second frequency component does not satisfy the predetermined condition, the determination section 117 determines a position of a focus lens that brings a desired subject into an in-focus state based on the plurality of first contrast evaluation values (S120). When the contrast evaluation value of the second frequency component does not satisfy the predetermined condition, the determination section 117 may determine to make the expectation by adding or subtracting the focus lens positions that obtain the peaks of the plurality of first contrast evaluation values by a predetermined correction amount. Of the subject reaches the position of the focusing lens.

The imaging control section 110 instructs the lens control section 220 to move the focus lens so as to move the focus lens to the position of the focus lens determined by the determination section 117 (S122).

As described above, based on the relative reliability of the contrast evaluation values of different spatial frequency components, the contrast evaluation values of the spatial frequency components that are referred to in order to determine the position of the focusing lens are appropriately selected. Therefore, the accuracy of the process of determining the focus lens position for bringing the desired subject into the in-focus state can be further improved.

FIG. 5 illustrates an example of a computer 1200 that may fully or partially embody aspects of the present invention. The program installed on the computer 1200 enables the computer 1200 to function as an operation associated with a device according to an embodiment of the present invention or one or more “parts” of the device. Alternatively, the program can cause the computer 1200 to perform the operation or the one or more "parts". This program enables the computer 1200 to execute a process or a stage of the process according to an embodiment of the present invention. Such a program may be executed by the CPU 1212 to cause the computer 1200 to perform specified operations associated with some or all of the blocks in the flowcharts and block diagrams described in this specification.

The computer 1200 according to the present embodiment includes a CPU 1212 and a RAM 1214, which are connected to each other through a host controller 1210. The computer 1200 also includes a communication interface 1222, an input / output unit, and they are connected to the host controller 1210 through an input / output controller 1220. The computer 1200 also includes a ROM 1230. The CPU 1212 operates according to the programs stored in the ROM 1230 and the RAM 1214, thereby controlling each unit.

The communication interface 1222 communicates with other electronic devices via a network. The hard disk drive can store programs and data used by the CPU 1212 in the computer 1200. The ROM 1230 stores therein a boot program and the like executed by the computer 1200 at the time of operation, and / or a program that depends on the hardware of the computer 1200. The program is provided through a computer-readable recording medium such as a CR-ROM, a USB memory, or an IC card, or a network. The program is installed in a RAM 1214 or a ROM 1230 which is also an example of a computer-readable recording medium, and is executed by the CPU 1212. The information processing described in these programs is read by the computer 1200 and causes the cooperation between the program and the above-mentioned various types of hardware resources. The operation or processing of information can be realized with the use of the computer 1200, thereby constituting a device or method.

For example, when performing communication between the computer 1200 and an external device, the CPU 1212 may execute a communication program loaded in the RAM 1214, and based on the processing described in the communication program, instruct the communication interface 1222 to perform communication processing. Under the control of the CPU 1212, the communication interface 1222 reads the transmission data stored in a transmission buffer provided in a recording medium such as a RAM 1214 or a USB memory, and sends the read transmission data to the network, or from The received data received by the network is written into a receiving buffer provided on the recording medium.

In addition, the CPU 1212 can cause the RAM 1214 to read all or necessary parts of a file or database stored in an external recording medium such as a USB memory, and perform various types of processing on the data on the RAM 1214. The CPU 1212 can then write the processed data back to the external recording medium.

Various types of information such as various types of programs, data, tables, and databases can be stored in a recording medium and subjected to information processing. For the data read from the RAM 1214, the CPU 1212 can perform various types of operations, including information specified by the program's instruction sequence, described throughout the disclosure, information processing, conditional judgment, conditional transfer, unconditional transfer, information Retrieve / replace various types of processing, and write the results back to RAM 1214. In addition, the CPU 1212 can retrieve information in files, databases, etc. in the recording medium. For example, when a plurality of entries having the attribute value of the first attribute respectively associated with the attribute value of the second attribute are stored in the recording medium, the CPU 1212 may retrieve the attribute that specifies the first attribute from the plurality of entries. The entry whose value matches the condition, and reads the attribute value of the second attribute stored in the entry, thereby obtaining the attribute value of the second attribute associated with the first attribute meeting the predetermined condition.

The above program or software module may be stored on the computer 1200 or a computer-readable storage medium near the computer 1200. In addition, a recording medium such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, so that the program can be provided to the computer 1200 via the network.

It should be noted that the order of execution of each process such as actions, sequences, steps, and stages in the devices, systems, programs, and methods shown in the claims, the description, and the drawings is not specifically stated "before" , "In advance", and so on, and as long as the output of the previous processing is not used in the subsequent processing, it can be implemented in any order. The operation flow in the claims, the description, and the drawings is described using “first”, “next”, and the like for convenience, but it is not meant to be implemented in this order.

The present invention has been described using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above-mentioned embodiments. It is apparent from the description of the claims that the manner in which such changes or improvements are added can be included in the technical scope of the present invention.

【Symbol Description】

100 camera

102 camera department

110 camera control section

111 acquisition department

112 first filter section

113 second filter section

114 export department

115 inspection department

116 Judgment Department

117 Confirmation Department

120 image sensor

160 display

162 Operation Department

170 memory

200 lens section

210 lens

212 lens movement mechanism

220 lens control section

1200 computer

1210 Host Controller

1212 CPU

1214 RAM

1220 input / output controller

1222 communication interface

1230 ROM

Claims

A determining device includes:

An acquisition unit that acquires an image captured by an imaging device including a focusing lens;

A first filter unit that passes a first frequency component of a spatial frequency component of the image;

A second filter unit that passes a second frequency component of a higher frequency band than the first frequency component of the spatial frequency component of the image;

A deriving unit, which uses a first frequency component of the image to derive a first contrast evaluation value of the image, and uses a second frequency component of the image to derive a second contrast evaluation value of the image;

A detecting unit that detects peaks of a plurality of the first contrast evaluation values each of a plurality of the images;

A judging section that, when the peaks of the plurality of first contrast evaluation values are detected by the detecting section, it determines whether the plurality of second contrast evaluation values of each of the plurality of images satisfy a predetermined condition; and

The determining unit determines a position of the focus lens based on the plurality of second contrast evaluation values when the plurality of second contrast evaluation values satisfy the predetermined condition.
The determination apparatus according to claim 1, wherein:

When the plurality of second contrast evaluation values do not satisfy the predetermined condition, the determination section determines a position of the focus lens based on the plurality of first contrast evaluation values.
The determination apparatus according to claim 1, wherein:

The detecting unit further detects peaks of the plurality of second contrast evaluation values,

The predetermined condition is that peaks of the plurality of second contrast evaluation values are detected by the detection section.
The determination apparatus according to claim 1, wherein:

The detecting unit further detects peaks of the plurality of second contrast evaluation values,

The predetermined condition is that a peak value of the plurality of second contrast evaluation values detected by the detection unit is equal to or greater than a predetermined value.
The determination apparatus according to claim 1, wherein:

The detecting unit further detects peaks of the plurality of second contrast evaluation values,

The predetermined condition is that peaks of the plurality of second contrast evaluation values detected by the detection section are greater than or equal to a predetermined value, and a difference between a maximum value and a minimum value of the plurality of second contrast evaluation values is greater than or Equal to the predetermined difference.
The determination apparatus according to claim 1, wherein:

The predetermined condition is that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range. Inside.
The determination apparatus according to claim 1, wherein:

The detecting unit further detects peaks of the plurality of second contrast evaluation values,

The predetermined condition is that a difference between a position of the focus lens determined based on the plurality of first contrast evaluation values and a position of the focus lens determined based on the plurality of second contrast evaluation values is within a predetermined range. Within, the peaks of the plurality of second contrast evaluation values detected by the detection section are greater than or equal to a predetermined value, and the difference between the maximum value and the minimum value of the plurality of second contrast evaluation values is greater than or equal to a predetermined difference .
A determining device includes:

The determining device according to any one of claims 1 to 7;

The focusing lens; and

A control unit controls the position of the focus lens based on the position of the focus lens determined by the determination device.
A determination method, including:

A stage of acquiring an image captured by an imaging device including a focusing lens;

A stage in which a first frequency component of a spatial frequency component of the image is passed through a first filter section;

A stage of passing a second frequency component of a higher frequency band than the first frequency component of the spatial frequency component of the image via a second filter;

A stage of deriving a first contrast evaluation value of the image using a first frequency component of the image;

A stage of deriving a second contrast evaluation value of the image using a second frequency component of the image;

A stage of detecting peaks of a plurality of the first contrast evaluation values of each of the plurality of images;

A stage of determining whether the plurality of second contrast evaluation values of each of the plurality of images satisfy a predetermined condition when peaks of the plurality of first contrast evaluation values are detected in the detection stage;

When the plurality of second contrast evaluation values meet the predetermined condition, a stage of determining a position of the focusing lens based on the plurality of second contrast evaluation values.
A program for causing a computer to function as the determination device according to any one of claims 1 to 7.