WO2015033646A1 - 撮像装置及び合焦制御方法 - Google Patents
撮像装置及び合焦制御方法 Download PDFInfo
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- WO2015033646A1 WO2015033646A1 PCT/JP2014/066385 JP2014066385W WO2015033646A1 WO 2015033646 A1 WO2015033646 A1 WO 2015033646A1 JP 2014066385 W JP2014066385 W JP 2014066385W WO 2015033646 A1 WO2015033646 A1 WO 2015033646A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
- G02B7/346—Systems for automatic generation of focusing signals using different areas in a pupil plane using horizontal and vertical areas in the pupil plane, i.e. wide area autofocusing
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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
- H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
- G02B7/365—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals by analysis of the spatial frequency components of the image
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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
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
- H04N23/631—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
- H04N23/632—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters for displaying or modifying preview images prior to image capturing, e.g. variety of image resolutions or capturing parameters
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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
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
- H04N23/633—Control of cameras or camera modules by using electronic viewfinders for displaying additional information relating to control or operation of the camera
- H04N23/635—Region indicators; Field of view indicators
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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
- H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/703—SSIS architectures incorporating pixels for producing signals other than image signals
- H04N25/704—Pixels specially adapted for focusing, e.g. phase difference pixel sets
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/285—Systems for automatic generation of focusing signals including two or more different focus detection devices, e.g. both an active and a passive focus detecting device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
- H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
- H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
- H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements
Definitions
- the present invention relates to an imaging apparatus and a focus control method.
- an imaging device In recent years, with the increase in the resolution of solid-state imaging devices such as CCD (Charge Coupled Device) image sensors and CMOS (Complementary Metal Oxide Semiconductor) image sensors, mobile phones such as digital still cameras, digital video cameras, and smartphones, PDA (Personal Digital). Demand for information equipment having a photographing function such as an assistant (mobile information terminal) is rapidly increasing. Note that an information device having the above imaging function is referred to as an imaging device.
- CCD Charge Coupled Device
- CMOS Complementary Metal Oxide Semiconductor
- Imaging apparatuses employ a contrast AF (Auto Focus) method or a phase difference AF method as a focusing control method for focusing on a main subject. Since the contrast AF method and the phase difference AF method each have advantages, an image pickup apparatus using both of them has also been proposed (see, for example, Patent Document 1).
- a contrast AF Auto Focus
- a phase difference AF method as a focusing control method for focusing on a main subject. Since the contrast AF method and the phase difference AF method each have advantages, an image pickup apparatus using both of them has also been proposed (see, for example, Patent Document 1).
- Patent Document 1 discloses an imaging apparatus that performs focus control using the contrast AF method when the defocus amount cannot be calculated by the phase difference AF method, or when the defocus amount reliability is low even when the defocus amount can be calculated. Disclosure.
- Patent Document 1 after calculating the defocus amount by the phase difference AF method and then shifting to the focus control by the contrast AF method according to the reliability of the defocus amount, the contrast AF method is used from the beginning. Compared with the case where the focus control is performed, the time until the focus control is completed becomes longer.
- An object of the present invention is to provide an imaging apparatus and a focus control method that can perform high-speed AF.
- the imaging device of the present invention is an imaging device having an imaging device that images a subject through an imaging optical system including a focus lens, and the imaging device has a pair of light beams that have passed through different parts of the pupil region of the imaging optical system.
- a first signal detection unit that detects a signal corresponding to one of the light beams
- a second signal detection unit that detects a signal corresponding to the other light beam of the pair of light beams.
- a first focus control for moving the focus lens to a focus position determined based on detection signals of the first signal detection unit and the second signal detection unit; and a predetermined movement range of the focus lens. To move the focus lens to an in-focus position determined based on the contrast of the captured image captured by the image sensor at each moving position.
- focusing control unit for performing any one of the focusing control, and whether to perform the first focusing control or the second focusing control, the first signal detection unit and the second focusing control.
- the movement range is determined according to the information.
- a control unit that variably controls at least the arbitrary distance among the arbitrary distances in the movement range.
- the focus control method of the present invention is a focus control method by an image pickup apparatus having an image pickup device that picks up an image of a subject through an image pickup optical system including a focus lens, and the image pickup device has different pupil regions of the image pickup optical system.
- a first signal detector that detects a signal corresponding to one of the pair of light beams that has passed through the portion; and a second signal detection that detects a signal corresponding to the other light beam of the pair of light beams.
- a first focus control for moving the focus lens to a focus position determined based on detection signals of the first signal detection unit and the second signal detection unit, and the focus lens Are moved by an arbitrary distance along the optical axis direction within a predetermined movement range, and the focus is determined at the focal position determined based on the contrast of the captured image captured by the image sensor at each movement position.
- the focus control by the phase difference AF method and the focus control by the contrast AF method are used in combination, it is possible to perform high-speed AF by reducing the time until the focus control is completed.
- An imaging device and a focus control method can be provided.
- FIG. 1 is a diagram illustrating a schematic configuration of a digital camera as an example of an imaging apparatus for describing an embodiment of the present invention.
- FIG. 2 is a schematic plan view showing an overall configuration of a solid-state image sensor 5 mounted on the digital camera shown in FIG. 1.
- FIG. 3 is a partially enlarged view of one AF area 53 shown in FIG. 2.
- FIG. 4 is a diagram showing only a phase difference detection pixel 52 shown in FIG. 3.
- 2 is a flowchart for explaining an AF operation of the digital camera shown in FIG. 1. It is a flowchart for demonstrating the process of step S6 in the flowchart of FIG. It is a flowchart for demonstrating the modification of the process of step S6 in the flowchart of FIG.
- FIG. 6 is a flowchart for explaining a modification of the AF operation of the digital camera shown in FIG. 1. It is a flowchart for demonstrating the process of step S18 in the flowchart of FIG. 12 is a flowchart for explaining processing between step S181 and step S186 in the flowchart of FIG. 3 is a flowchart for explaining a continuous AF operation of the digital camera shown in FIG. 1. It is a figure which shows the modification of the arrangement
- FIG. 1 is a diagram showing a schematic configuration of a digital camera as an example of an imaging apparatus for explaining an embodiment of the present invention.
- the digital camera shown in FIG. 1 includes a lens device having a photographing lens 1 including a focus lens, a zoom lens, and the like for focus adjustment, and an aperture 2.
- the lens device constitutes an imaging optical system.
- the lens device may be either detachable from the camera body or fixed.
- the photographing lens 1 only needs to include at least a focus lens. Alternatively, a single focus lens that performs focus adjustment by moving the entire lens system may be used.
- the camera body includes a CCD type or CMOS type solid-state imaging device 5 that images a subject through a lens device, and an analog signal processing unit that performs analog signal processing such as correlated double sampling connected to the output of the solid-state imaging device 5 6 and an A / D conversion circuit 7 for converting an analog signal output from the analog signal processing unit 6 into a digital signal.
- the analog signal processing unit 6 and the A / D conversion circuit 7 are controlled by the system control unit 11.
- the analog signal processing unit 6 and the A / D conversion circuit 7 may be built in the solid-state imaging device 5.
- a system control unit 11 that performs overall control of the entire electric control system of the digital camera controls the lens driving unit 8 to adjust the position of the focus lens included in the photographing lens 1 or the position of the zoom lens included in the photographing lens 1. Make adjustments. Further, the system control unit 11 adjusts the exposure amount by controlling the aperture amount of the aperture 2 via the aperture drive unit 9.
- system control unit 11 drives the solid-state imaging device 5 via the imaging device driving unit 10 and outputs a subject image captured through the photographing lens 1 as a captured image signal.
- An instruction signal from the user is input to the system control unit 11 through the operation unit 14.
- the system control unit 11 selects one of the contrast AF processing unit 18 and the phase difference AF processing unit 19 and moves the focus lens to the in-focus position determined by the selected processing unit.
- the electric control system of the digital camera includes an interpolation calculation and a gamma correction for the main memory 16, the memory control unit 15 connected to the main memory 16, and the captured image signal output from the A / D conversion circuit 7.
- a digital signal processing unit 17 that performs calculation, RGB / YC conversion processing, and the like to generate captured image data
- a contrast AF processing unit 18 that determines a focus position by a contrast AF method, and a focus position by a phase difference AF method
- a phase difference AF processing unit 19 for determining the image, an external memory control unit 20 to which a removable recording medium 21 is connected, and a display control unit 22 to which a display unit 23 mounted on the back of the camera or the like is connected. .
- the memory control unit 15, the digital signal processing unit 17, the contrast AF processing unit 18, the phase difference AF processing unit 19, the external memory control unit 20, and the display control unit 22 are connected to each other by a control bus 24 and a data bus 25. It is controlled by a command from the system control unit 11.
- FIG. 2 is a schematic plan view showing the overall configuration of the solid-state imaging device 5 mounted on the digital camera shown in FIG.
- the solid-state imaging device 5 has a light receiving surface 50 on which a large number of pixels arranged two-dimensionally in a row direction X and a column direction Y orthogonal thereto.
- nine AF areas 53 which are areas to be focused, are provided in the example of FIG.
- the AF area 53 is an area including imaging pixels and phase difference detection pixels as pixels.
- the imaging pixels are arranged on the light receiving surface 50 excluding the AF area 53.
- the AF area 53 may be provided on the light receiving surface 50 without a gap.
- FIG. 3 is a partially enlarged view of one AF area 53 shown in FIG.
- each pixel 51 includes a photoelectric conversion unit such as a photodiode and a color filter formed above the photoelectric conversion unit.
- a pixel 51 (R pixel 51) including a color filter (R filter) that transmits red light is denoted by “R”, and a pixel 51 including a color filter (G filter) that transmits green light.
- the letter “G” is assigned to (G pixel 51), and the letter “B” is assigned to pixel 51 (B pixel 51) including a color filter (B filter) that transmits blue light.
- the color filter array is a Bayer array over the entire light receiving surface 50.
- each G pixel 51 in an arbitrary pixel row among the pixel rows including the R pixel 51 and the G pixel 51, and the G pixel 51 of the same color closest to the G pixel 51 in the column direction Y. are the phase difference detection pixels 52.
- one direction of the two-dimensional array is defined as an X direction or a row direction, and the other direction is defined as a Y direction or a column direction.
- FIG. 4 is a diagram showing only the phase difference detection pixel 52 shown in FIG.
- the phase difference detection pixel 52 includes two types of pixels, a phase difference detection pixel 52A and a phase difference detection pixel 52B.
- the phase difference detection pixel 52A receives one of the pair of light beams that have passed through different parts of the pupil region of the photographing lens 1 and detects a signal corresponding to the amount of received light (first signal detection). Part).
- the phase difference detection pixel 52B is a signal detection unit (second signal detection unit) that receives the other of the pair of light beams and detects a signal corresponding to the amount of received light.
- the plurality of pixels 51 other than the phase difference detection pixels 52A and 52B are imaging pixels, and the imaging pixels receive the pair of light beams that have passed through the photographing lens 1 and correspond to the amount of received light. Detects the detected signal.
- a light shielding film is provided above the photoelectric conversion unit of each pixel 51, and an opening that defines a light receiving area of the photoelectric conversion unit is formed in the light shielding film.
- the center of the opening of the imaging pixel 51 coincides with the center of the photoelectric conversion unit of the imaging pixel 51.
- the center of the opening (outlined portion in FIG. 4) of the phase difference detection pixel 52A is eccentric to the right side with respect to the center of the photoelectric conversion unit of the phase difference detection pixel 52A.
- the center of the opening (outlined portion in FIG. 4) of the phase difference detection pixel 52B is eccentric to the left with respect to the center of the photoelectric conversion unit of the phase difference detection pixel 52B.
- the right direction here is one direction of the X direction shown in FIG. 3, and the left direction is the other direction of the X direction.
- the pixel group including the phase difference detection pixels 52A in an arbitrary row, and the phase difference detection pixels 52B arranged at the same distance in the same direction with respect to the phase difference detection pixels 52A of the pixel group.
- the phase difference in the row direction X in the image captured by each of these two pixel groups can be detected.
- the AF area 53 has a phase difference detection pixel 52A and a predetermined distance in a direction orthogonal to the phase difference detection direction (row direction X) with respect to the phase difference detection pixel 52A.
- a pixel pair P1 composed of phase difference detection pixels 52B arranged at an interval and a pixel pair P2 in which the positional relationship between the phase difference detection pixels 52A and the phase difference detection pixels 52B in the pixel pair P1 is reversed are in the row direction.
- At least one pair line arranged alternately in X is provided.
- This pair line includes a first signal detection unit group (phase difference detection pixels 52A of all pixel pairs P1) composed of a plurality of phase difference detection pixels 52A arranged along the phase difference detection direction, and the first Phase difference detection pixels arranged at the same distance (distance of one pixel) in one direction in the Y direction (downward on the paper surface in FIG. 4 as an example) with respect to each phase difference detection pixel 52A of the signal detection unit group.
- the first direction of the signal detection unit group (phase difference detection pixels 52B of all pixel pairs P1) including the pixels 52B and the same direction with respect to each phase difference detection pixel 52A of the first signal detection unit group (FIG. 4).
- the second signal detection unit group (phase difference detection pixels 52A of all pixel pairs P2) is composed of a plurality of phase difference detection pixels 52A arranged at the same distance in the diagonally lower right direction and aligned along the detection direction. ) And each phase difference detection image of the second signal detection unit group.
- the phase difference AF processing unit 19 shown in FIG. 1 reads out from the phase difference detection pixel 52A and the phase difference detection pixel 52B in one AF area 53 selected from among the nine AF areas 53 by a user operation or the like. Using the detection signal group, a phase difference that is a relative positional shift amount between the two images formed by the pair of light beams is calculated.
- the phase difference AF processing unit 19 determines the focus adjustment state of the photographing lens 1, here the amount away from the in-focus state and the direction away from the in-focus state, that is, the defocus amount. Ask. The phase difference AF processing unit 19 determines the focus position of the focus lens from the defocus amount.
- the system control unit 11 moves the focus lens to the in-focus position determined by the phase difference AF processing unit 19 based on detection signals from the phase difference detection pixel 52A and the phase difference detection pixel 52B. It functions as an in-focus control unit.
- the contrast AF processing unit 18 shown in FIG. 1 analyzes an image picked up by one AF area 53 selected by a user operation or the like from the nine AF areas 53, and uses the well-known contrast AF method. Determine the in-focus position.
- the contrast AF processing unit 18 calculates the contrast (brightness / darkness difference) of the image obtained for each moved position (a plurality of positions) while moving the focus lens position of the photographing lens 1 under the control of the system control unit 11. Then, the focus lens position where the contrast is maximized is determined as the focus position.
- the contrast is obtained by taking the sum of the differences between the signals of adjacent pixels.
- the system control unit 11 moves the focus lens by an arbitrary distance along the optical axis direction from the end of the maximum movable range (range from INF to MOD), and images by the solid-state imaging device 5 at each moving position. It functions as an in-focus control unit that performs the second in-focus control to move the focus lens to the in-focus position determined by the contrast AF processing unit 18 based on the contrast of the captured image.
- the system control unit 11 when there is an instruction to perform AF, performs the first focusing control by the phase difference AF method or the second focusing control by the contrast AF method.
- the system control unit 11 determines whether to perform the first focusing control or the second focusing control using information generated by using the detection signal of the phase difference detection pixel 52A and the phase difference detection pixel 52B (described later). Functions as a focus control determination unit that is determined by the reliability determination values J1, J2).
- the system control unit 11 functions as a control unit that variably controls the arbitrary distance according to the information when it is determined to perform the second focusing control.
- the arbitrary distance is set to an initial value when the power is turned on.
- the focus lens is finely moved in the range from INF to MOD, and the contrast value is obtained at many positions. For this reason, compared with the case where the arbitrary distance is the initial value, the accuracy of determining the in-focus position increases, but the speed until the in-focus position is determined decreases.
- the focus lens is largely moved in the range from INF to MOD, and the contrast value is obtained at a small number of positions. For this reason, the accuracy of determining the in-focus position is lower than when the arbitrary distance is the initial value, but the speed until the in-focus position is determined is improved.
- FIG. 5 is a flowchart for explaining the AF operation of the digital camera shown in FIG.
- the phase difference AF processing unit 19 acquires detection signals of the phase difference detection pixels 52A and the phase difference detection pixels 52B in the selected AF area 52 (step S1).
- the phase difference AF processing unit 19 calculates the correlation between the detection signal groups of the phase difference detection pixel 52A and the phase difference detection pixel 52B of the pixel pair P1 constituting one pair line among the acquired detection signals. (Step S2).
- the data of one detection signal group is A [1] ... A [k]
- the data of the other detection signal group is B [1] ... B [k]
- these two pieces of data are shifted by the shift amount.
- An area C [d] surrounded by two data waveforms obtained by the following equation when “d” is shifted is obtained.
- the correlation calculation result C1 [d] is a value indicating the degree of coincidence of images captured by the phase difference detection pixel 52A and the phase difference detection pixel 52B of the pixel pair P1.
- phase difference AF processing unit 19 correlates the detection signal groups of the phase difference detection pixel 52A and the phase difference detection pixel 52B of the pixel pair P2 constituting the one pair line among the acquired detection signals. Calculation is performed (step S3).
- the correlation calculation result C2 [d] is a value indicating the degree of coincidence of images captured by the phase difference detection pixel 52A and the phase difference detection pixel 52B of the pixel pair P2.
- phase difference AF processing unit 19 uses the correlation calculation result C1 [d] and the correlation calculation result C2 [d] to trust each of the correlation calculation result C1 [d] and the correlation calculation result C2 [d].
- a reliability determination value J1 for determining the degree is generated (step S4).
- the phase difference AF processing unit 19 functions as an information generation unit.
- the correlation calculation result may be incorrect if the correlation calculation result is different between the two pixel pairs P1 and P2 in the area even though the same subject is imaged. Therefore, it can be determined that the reliability of the in-focus position determined using the detection signal of the phase difference detection pixel of the pair line is low.
- phase difference AF processing unit 19 functioning as a reliability determination value generation unit compares the shape of the graph based on C1 [d] with the shape of the graph based on C2 [d], thereby determining the reliability determination value J1. Is generated.
- the numerator of formula (2) has a small value when the shape of the graph based on C1 [d] is close to the shape of the graph based on C2 [d], and has a large value when the two shapes are different.
- step S4 the system control unit 11 compares the reliability determination value J1 with a preset threshold TH, and when J1 is equal to or greater than the threshold TH (step S5: YES), it is determined that the reliability of focus control by the phase difference AF method is low, the contrast AF processing unit 18 is selected, and the focus position is determined by the contrast AF processing unit 18. Then, in accordance with the determined focus position, focus control of the photographic lens 1 is performed (step S6).
- step S5 when the reliability determination value J1 is less than the threshold TH (step S5: NO), the system control unit 11 determines that the focus control reliability by the phase difference AF method is high, and the phase difference AF processing unit. 19 is selected, and the phase difference AF processing unit 19 determines the in-focus position. Then, in accordance with the determined focus position, focus control of the photographic lens 1 is performed (step S7).
- phase difference AF processing unit 19 When there are a plurality of pair lines in the selected AF area 53, the phase difference AF processing unit 19 performs the processing of steps S2 to S4 for each pair line to generate the reliability determination value J1.
- the system control unit 11 uses the phase difference AF method for the selected AF area 53. It is determined that the reliability of focusing control by is high.
- the in-focus position is determined using the detection signal read from the pair line whose reliability determination value J1 is less than the threshold value TH.
- the system control unit 11 performs focus control by the phase difference AF method using the detection signals of the phase difference detection pixels on the pair lines excluding the pair line whose reliability is determined to be lower than the threshold value.
- the phase difference AF processing unit 19 determines the in-focus position based on the average of the defocus amounts calculated for each pair line, for example.
- the system control unit 11 performs focusing control by the phase difference AF method for the selected AF area 53. It is determined that the reliability of is low.
- FIG. 6 is a flowchart for explaining details of the process in step S6 in the flowchart shown in FIG.
- step S60 the system control unit 11 compares the reliability determination value J1 with the threshold value TH1.
- the threshold value TH1 is a value larger than the threshold value TH.
- the reliability determination value J1 is a large value.
- the reliability judgment value J1 is large, The value is smaller than when the frequency is high. For this reason, the factor which selected the focus control by contrast AF method can be determined by the magnitude of the reliability determination value J1.
- step S60 YES
- the system control unit 11 cannot obtain the accuracy of the phase difference AF because the frequency of the subject image formed in the AF area 53 is high. Determination is made and the process of step S61 is performed.
- step S61 the system control unit 11 sets an arbitrary distance for moving the focus lens to be smaller than the initial value in order to obtain a contrast value (AF evaluation value) of contrast AF.
- the reason why the arbitrary distance is made smaller than the initial value is that the frequency of the subject image formed in the AF area 53 is high, and acquiring the contrast value at finer intervals contributes to improving the AF accuracy.
- step S60 If J1 ⁇ HT1 (step S60: NO), the system control unit 11 does not have a high frequency of the subject image formed in the AF area 53, but the accuracy of the phase difference AF cannot be obtained due to other factors.
- step S62 the reliability determination value J1 is compared with the threshold value TH2.
- the threshold value TH2 is a value smaller than the threshold value TH1 and larger than the threshold value TH.
- the reliability determination value J1 is greater than or equal to the threshold value TH2, it can be said that the reliability of the correlation calculation result in steps S2 and S3 is low. On the other hand, if the reliability determination value J1 is less than the threshold value TH2, it can be said that the reliability of the correlation calculation result in steps S2 and S3 is high.
- step S63 the system control unit 11 performs the process of step S63 if J1 ⁇ TH2 (step S62: YES), and performs the process of step S64 if J1 ⁇ TH2 (step S62: NO).
- step S63 the system control unit 11 sets the arbitrary distance to an initial value.
- the reason why the arbitrary distance is set to the initial value is that the frequency of the subject image formed in the AF area 53 is low, and a certain degree of focusing accuracy can be expected without reducing the arbitrary distance.
- the threshold value TH3 is a value determined independently of the threshold values TH, TH1, and TH2.
- step S64 YES
- the system control unit 11 sets the arbitrary distance larger than the initial value in step S65.
- Step S62 When NO, the reliability of the correlation calculation results in steps S2 and S3 is not high enough to implement phase difference AF, but is not too low. In this situation, the phase difference obtained from the correlation calculation result in steps S2 and S3 is a value that can be trusted to some extent.
- step S64 NO
- the system control unit 11 sets the arbitrary distance as an initial value in step S63.
- the time to detect the focus lens position at which the contrast reaches a peak is shortened even if the arbitrary distance is not made larger than the initial value.
- the in-focus position can be determined with high accuracy without slowing down the focusing speed.
- step S66 the system control unit 11 performs initial driving for moving the focus lens from the current position to INF or MOD, and then sequentially moves the focus lens in the range from INF to MOD according to the set arbitrary distance.
- the contrast AF processing unit 18 acquires an AF evaluation value at each moving position of the focus lens, and determines a focus position based on the AF evaluation value. Finally, the system control unit 11 moves the focus lens to the determined in-focus position.
- step S62, step S64, and step S65 may be omitted, and the process of step S63 may be performed when step S60 is NO.
- the digital camera of FIG. 1 uses the contrast AF method in a situation where the reliability determination value J1 is equal to or greater than the threshold value TH and the focusing accuracy by the phase difference AF method cannot ensure sufficient focusing accuracy. Shift to focus control. At this time, since the arbitrary distance is variably controlled according to the magnitude of the reliability determination value J1, contrast AF in which both the focusing speed and the focusing accuracy can be performed can be performed.
- the arbitrary distance is variably controlled in consideration of the magnitude of the phase difference d, so that the focusing speed can be further increased.
- step S66 in FIG. 6 the system controller 11 performs initial driving.
- the reliability of the correlation calculation result in steps S2 and S3 is high, the focus lens in-focus position with respect to the current position of the focus lens.
- the direction (which is obtained from the correlation calculation result) is reliable to some extent.
- step S66 when the processing is performed in the order of step S64, step S63, and step S66, and in the order of step S64, step S65, and step S66, the initial drive is omitted in step S66. it can.
- an operation example when the initial drive is omitted will be described.
- FIG. 7 is a flowchart showing a modification of the process of step S6 in the flowchart shown in FIG. In FIG. 7, the same processes as those in FIG.
- Step S60 When YES, the system control unit 11 sets the initial drive (step S67), and proceeds to step S61.
- Step S62 When NO, the system control unit 11 performs initial drive setting (Step S68), and proceeds to Step S63.
- Step S64 When NO, the system control unit 11 sets no initial drive (step S69), and proceeds to step S63.
- Step S64 When YES, the system control unit 11 sets the initial drive (step S70), and proceeds to step S65.
- step S66 when the system control unit 11 performs the initial drive setting, the system control unit 11 performs the initial drive and then moves the focus lens by an arbitrary distance.
- the system control unit 11 does not perform the initial driving when the setting for the initial driving is not performed, and focuses on the direction of the phase difference obtained from the correlation calculation result in step S2 or step S3, starting from the current focus lens position. Move the lens by an arbitrary distance.
- the focusing speed of contrast AF can be further increased.
- step S67 of FIG. 7 instead of performing the setting with initial driving, the lens moving range may be set to be narrower than the maximum range.
- a range defined by a predetermined distance in the optical axis direction around the current position of the focus lens may be set as the lens movement range.
- the lens movement range can be narrowed compared to when initial driving is performed, and the focusing speed can be increased.
- a method for determining the in-focus position in step S7 in FIG. 5 a method of determining a defocus amount based on the correlation calculation result C1 [d] and determining a focus position according to the defocus amount, and a correlation calculation result C2
- a method of determining a defocus amount based on [d] and determining a focus position according to the defocus amount, a method of determining a focus position according to, for example, an average value of these two defocus amounts, or the like may be employed.
- the pair line in the AF area 53 has been described as a line composed of the pixel pair P1 and the pixel pair P2.
- this pair line is a line composed of the pixel pair P3 and the pixel pair P4. It is also possible to say.
- the phase difference AF processing unit 19 detects the detection signal groups of the phase difference detection pixels 52A and 52B of the pixel pair P3 in step S2 of FIG.
- the correlation calculation is performed between the detection signal groups of the phase difference detection pixels 52A and 52B of the pixel pair P4.
- a reliability determination value J1 is generated based on the results of these two correlation calculations.
- the phase difference AF processing unit 19 outputs the integrated value of the detection signals of the phase difference detection pixels 52A and the detection signals of the phase difference detection pixels 52B output from all the pixel pairs P1 constituting the pair line.
- the ratio of the integrated values is generated as the degree of coincidence between the two images captured by all the pixel pairs P1.
- phase difference AF processing unit 19 integrates the detection value of the phase difference detection pixel 52A and the integration value of the detection signal of the phase difference detection pixel 52B output from all the pixel pairs P2 constituting the pair line. Is generated as the degree of coincidence between the two images captured by all the pixel pairs P2.
- the integrated value is substantially the same value except for the difference caused by the phase difference between the image captured by the phase difference detection pixel 52A and the image captured by the phase difference detection pixel 52B.
- the integrated value of the detection signals of the phase difference detection pixels 52A of all the pixel pairs P2 and the integrated value of the detection signals of the phase difference detection pixels 52B of all the pixel pairs P2 are the differences caused by the phase difference. Except for this, it takes almost the same value.
- the integrated value of the detection signals of the phase difference detection pixels 52A of all the pixel pairs P1 and all the pixel pairs is a value that is greatly different even if the difference due to the phase difference is excluded.
- the integrated value of the detection signals of the phase difference detection pixels 52A of all the pixel pairs P2 and the integrated value of the detection signals of the phase difference detection pixels 52B of all the pixel pairs P2 are the differences caused by the phase difference. Even if you remove it, it will be a very different value
- phase difference detection pixel 52A in the pixel pair P2 is calculated from the ratio between the integrated value of the detection signal of the phase difference detection pixel 52A in the pixel pair P1 and the integrated value of the detection signal of the phase difference detection pixel 52B.
- the ratio between the integrated value of the detected signal and the integrated value of the detected signal of the phase difference detection pixel 52B it is possible to cancel the integrated value difference caused by the phase difference. If the difference between the integrated values caused by the phase difference can be canceled, it is possible to determine the presence or absence of the straight line L as shown in FIG.
- the phase difference AF processing unit 19 uses the following arithmetic expression (3) to focus by the phase difference AF method using the detection signals of the phase difference detection pixel 52A and the phase difference detection pixel 52B included in the pair line.
- a reliability determination value J2 for determining the reliability of control is generated.
- the phase difference AF processing unit functions as an information generation unit
- ⁇ P1A represents an integrated value of detection signals of the phase difference detection pixels 52A belonging to all the pixel pairs P1 in the pair line.
- ⁇ P1B indicates an integrated value of detection signals of the phase difference detection pixels 52B belonging to all the pixel pairs P1 in the pair line.
- ⁇ P2A indicates an integrated value of detection signals of the phase difference detection pixels 52A belonging to all the pixel pairs P2 in the pair line.
- ⁇ P2B indicates an integrated value of detection signals of the phase difference detection pixels 52B belonging to all the pixel pairs P2 in the pair line.
- the system control unit 11 compares the value of J2 with a preset threshold th, and when J2 ⁇ th, the reliability of the phase difference AF is low, and the focusing control by the phase difference AF has sufficient focusing accuracy. If J2 ⁇ th, it is determined that sufficient focusing accuracy can be obtained by focusing control using phase difference AF.
- the threshold th is set in accordance with an allowable value of focusing accuracy by phase difference AF.
- FIG. 10 is a flowchart for explaining a modification of the AF operation at the time of still image shooting of the digital camera shown in FIG.
- the phase difference AF processing unit 19 acquires detection signals of the phase difference detection pixels 52A and the phase difference detection pixels 52B in the selected AF area 53 (step S11).
- phase difference AF processing unit 19 integrates the output signals of the phase difference detection pixels 52A of the pixel pair P1 constituting one pair line among the acquired detection signals to obtain an integrated value ⁇ P1A (step S12). ).
- phase difference AF processing unit 19 integrates the output signals of the phase difference detection pixels 52B of the pixel pair P1 constituting one pair line among the acquired detection signals to obtain an integrated value ⁇ P1B (step S13). ).
- phase difference AF processing unit 19 integrates the output signals of the phase difference detection pixels 52A of the pixel pair P2 constituting one pair line among the acquired detection signals to obtain an integrated value ⁇ P2A (step S14). ).
- phase difference AF processing unit 19 integrates the output signals of the phase difference detection pixels 52B of the pixel pair P2 constituting one pair line among the acquired detection signals to obtain an integrated value ⁇ P2B (step S15). ).
- phase difference AF processing unit 19 functioning as a reliability determination value generation unit generates the reliability determination value J2 by the calculation of Expression (3) based on ⁇ P1A, ⁇ P1B, ⁇ P2A, and ⁇ P2B (step S16). .
- the system control unit 11 compares the reliability determination value J2 with the threshold th, and if J2 ⁇ th (step S17: YES), the phase difference AF method It is determined that the reliability of the focusing control by is low, the focus position is determined by the contrast AF processing unit 18, and the focusing control of the photographing lens 1 is performed according to the determined focusing position (step S18).
- step S17 If J2 ⁇ th (step S17: NO), the system control unit 11 determines that the focus control reliability by the phase difference AF method is high, and causes the phase difference AF processing unit 19 to determine the focus position. In accordance with the determined focus position, focus control of the taking lens 1 is performed (step S19).
- phase difference AF processing unit 19 When there are a plurality of pair lines in the selected AF area 53, the phase difference AF processing unit 19 performs the processing of steps S12 to S16 for each pair line to generate the reliability determination value J2.
- the system control unit 11 When there is a pair line in which the reliability determination value J2 is less than the threshold th among the plurality of pair lines, the system control unit 11 performs focusing control by the phase difference AF method for the selected AF area 53. It is determined that the reliability is high. In step S19, the in-focus position is determined using the detection signal read from the pair line that is less than the threshold th.
- the phase difference AF processing unit 19 determines the in-focus position based on the average of the defocus amounts calculated for each pair line, for example.
- the system control unit 11 When there is no pair line in which the reliability determination value J2 is less than the threshold value th among the plurality of pair lines, the system control unit 11 performs the focus control reliability by the phase difference AF method for the selected AF area 53. It is determined that the degree is low, and the process of step S18 is performed.
- FIG. 11 is a flowchart for explaining details of the processing in step S18 in the flowchart shown in FIG.
- step S180 the system control unit 11 compares the reliability determination value J2 with the threshold th1.
- the threshold th1 is a value greater than the threshold th.
- the reliability determination value J2 is a large value.
- the reliability determination value J2 is large, The value is smaller than when the frequency is high. For this reason, the factor which selected the focus control by contrast AF method can be determined by the magnitude of the reliability determination value J2.
- step S180 the system control unit 11 compares J2 with the threshold value th1, and if J2 ⁇ th1, the frequency of the subject image formed in the AF area 53 is high, and therefore the phase difference AF. It is determined that the accuracy cannot be obtained, and the process of step S181 is performed.
- Step S181 is the same process as step S61 of FIG.
- Step S183 is the same process as step S63 of FIG.
- Step S186 is the same process as step S66 of FIG.
- step S180 a setting may be made between step S180 and step S181 in FIG. 11 such that the lens movement range in the process of step S186 is narrower than the initial driving range.
- a range defined by a predetermined distance in the optical axis direction around the current position of the focus lens may be set as the lens movement range.
- the lens movement range can be narrowed compared to when initial driving is performed, and the focusing speed can be increased.
- the reliability determination value J2 corresponding to the reliability determination value J1 can be generated without performing the correlation calculation.
- the focusing speed can be increased.
- the pixel pair to be set to the pair line is P1.
- the reliability determination values can be generated as P3 and P4 instead of P2 and P2.
- a horizontal focusing algorithm for focusing on a subject whose horizontal component is the main, and a subject whose vertical component is the main.
- a vertical focusing algorithm for focusing is sequentially performed. For this reason, the calculation load is high, and depending on the execution order of the algorithm, there is a possibility of focusing in a direction where accuracy is not achieved.
- a reliability determination value J2 is obtained, and this reliability determination value J2 is effective information for determining the presence or absence of a subject having a horizontal component as shown in FIG. Therefore, the system control unit 11 determines the execution priority of the horizontal focusing algorithm and the vertical focusing algorithm using the reliability determination value J2, thereby enabling highly accurate AF.
- the operation will be described along the flowchart.
- FIG. 12 is a flowchart for explaining processing to be added between step S181 and step S183 in the flowchart of FIG. 11 and step S186.
- step S21 the system control unit 11 compares the reliability determination value J2 and the threshold value H1 (> th). If J2 ⁇ H1, the process of step S22 is performed. If J2 ⁇ H1, the process of step S25 is performed. Do.
- step S22 the system control unit 11 compares the reliability determination value J2 and the threshold value H2 (> H1). If J2 ⁇ H2, the process of step S23 is performed. If J2 ⁇ H2, the process of step S24 is performed. Do.
- step S23 the system control unit 11 sets to use only the horizontal focusing algorithm as the algorithm executed to determine the focusing position in step S186 in FIG.
- step S24 the system control unit 11 sets that the horizontal focusing algorithm is preferentially used as the algorithm executed in order to determine the focusing position in step S186 in FIG. That is, it is set to perform the vertical focusing algorithm after performing the horizontal focusing algorithm.
- step S25 the system control unit 11 compares the reliability determination value J2 and the threshold value V1 (> th). If J2 ⁇ V1, the process of step S26 is performed. If J2 ⁇ V1, the process of step S27 is performed. Do.
- step S26 the system control unit 11 sets to use only the vertical focusing algorithm as the algorithm executed to determine the focusing position in step S186 in FIG.
- step S27 the system control unit 11 sets that the vertical focusing algorithm is preferentially used as the algorithm executed to determine the focusing position in step S186 of FIG. That is, it is set to perform the horizontal focusing algorithm after performing the vertical focusing algorithm.
- the present invention can also be applied to the so-called continuous AF mode in which the main subject is kept focused as in the case of moving image capturing.
- FIG. 13 is a flowchart for explaining the AF operation of the digital camera in the continuous AF mode.
- the same processes as those shown in FIGS. 5 and 10 are denoted by the same reference numerals.
- the phase difference AF processing unit 19 performs the processing of steps S11 to S16 to generate the reliability determination value J2.
- the system control unit 11 compares the reliability determination value J2 with the threshold value th in step S17, and if J2 ⁇ th, the system control unit 11 proceeds to step S18 and should perform contrast AF or phase difference AF.
- the contrast AF is performed without performing the determination.
- step S17 if J2 ⁇ th in step S17, the process returns to step S1. If J1 ⁇ TH in step S5, the process in step S7 is performed, and the process returns to step S1 after step S7.
- step S1 it is normally considered to return to step S1 after step S6.
- the control shifts to focusing control by the phase difference AF method.
- the main subject continues to be a high-frequency subject, the focusing by contrast AF is performed again. The process shifts to focus control, and switching between phase difference AF and contrast AF frequently occurs.
- the reliability determination value J2 is generated without immediately shifting to step S1, and the reliability determination value J2 remains large ( That is, if the main subject is a high-frequency subject), focus control by contrast AF is performed in step S18.
- two adjacent pixel lines including the phase difference detection pixels 52A and 52B in the AF area 53 are defined as one block, and the detection signals of the phase difference detection pixels 52A and 52B in the block are used.
- the reliability determination values J1 and J2 are generated.
- phase difference detection pixels 52A and 52B are defined as one block, and the detection signals of the phase difference detection pixels 52A and 52B in this block are used.
- the reliability determination values J1 and J2 may be generated.
- FIG. 14 is a diagram showing a modification of the arrangement of the phase difference detection pixels 52A and 52B in the AF area 53 of the solid-state imaging device 5 shown in FIG.
- the AF area 53 includes a phase difference pixel line including a plurality of phase difference detection pixels 52A arranged in the row direction X and a plurality of phase difference detection pixels 52B arranged in the row direction X.
- Two phase difference pixel lines are provided, and reliability determination is performed with these four phase difference pixel lines as one block.
- the upward direction and the downward direction represent the vertical direction on the paper surface in the drawing.
- each phase difference detection pixel included in the odd-numbered phase difference pixel line is a phase difference detection pixel 52A
- each phase difference detection pixel included in the even-numbered phase difference pixel line is This is the phase difference detection pixel 52B.
- the phase difference detection pixel 52B is defined as a pixel pair P1.
- FIG. 15 is a diagram showing a modification of the arrangement of the phase difference detection pixels 52A and 52B in the AF area 53 of the solid-state imaging device 5 shown in FIG.
- the AF area 53 includes a phase difference pixel line including a plurality of phase difference detection pixels 52A arranged in the row direction X and a plurality of phase difference detection pixels 52B arranged in the row direction X. Two phase difference pixel lines are provided, and reliability determination is performed with these four phase difference pixel lines as one block.
- phase difference detection pixels included in the first and fourth phase difference pixel lines are the phase difference detection pixels 52A, and the second and third phase difference pixel lines are included in the phase difference pixel lines.
- Each of the included phase difference detection pixels is a phase difference detection pixel 52B.
- each phase difference detection pixel 52A of the phase difference pixel line in the first row in the block, and three pixels in the downward direction with respect to each phase difference detection pixel 52A are arranged.
- the phase difference detection pixel 52B is defined as a pixel pair P1.
- each phase difference detection pixel 52A of the phase difference pixel line of the fourth row in the block and a phase difference detection pixel 52B that is arranged three pixels upward from each phase difference detection pixel 52A, Is a pixel pair P2.
- the distance between two phase difference detection pixels constituting the pixel pair is the same in each of the pixel pairs P1 and P2 and the pixel pairs P3 and P4. Compared with the 14 examples, the reliability determination can be performed with high accuracy.
- the reliability determination can be performed with higher accuracy than the example of FIG.
- FIG. 16 is a diagram showing a modification of the arrangement of the phase difference detection pixels 52A and 52B in the AF area 53 of the solid-state imaging device 5 shown in FIG.
- phase difference pixel lines including a plurality of phase difference detection pixels 52B arranged in the row direction X are provided in the AF area 53, and a plurality of phase difference detection pixels 52A arranged in the row direction X are provided.
- One phase difference pixel line is provided, and reliability determination is performed with these three phase difference pixel lines as one block.
- each phase difference detection pixel 52A in the odd-numbered column, and each phase difference detection pixel 52A A phase difference detection pixel 52B arranged by one pixel in the downward direction is defined as a pixel pair P1.
- each phase difference detection pixel 52A in the even-numbered column and one pixel upward with respect to each phase difference detection pixel 52A The phase difference detection pixels 52B that are spaced apart are referred to as a pixel pair P2.
- each phase difference detection pixel 52A in the odd-numbered column and one pixel upward with respect to each phase difference detection pixel 52A The phase difference detection pixels 52B that are spaced apart are referred to as a pixel pair P3.
- each phase difference detection pixel 52A in the even-numbered column and one pixel downward with respect to each phase difference detection pixel 52A The phase difference detection pixels 52B that are spaced apart are referred to as a pixel pair P4.
- the reliability determination is performed with three phase difference pixel lines as one block, the number of phase difference pixel lines used for the reliability determination can be reduced as compared with the arrangement examples of FIGS. it can.
- the reliability determination can be performed with higher accuracy than in the examples of FIGS.
- FIG. 17 is a diagram showing a modification of the configuration of the AF area 53 of the solid-state imaging device 5 shown in FIG.
- the photoelectric conversion units of some G pixels 51 in the AF area 53 are divided into two, and the left side (pixels with “G1”) of the two divided photoelectric conversion units is the phase difference.
- the right side of the two divided pixels is the phase difference detection pixel 52B.
- Each pixel 51 is provided with one microlens 51.
- One microlens 51 is also provided in the phase difference detection pixel 52A and the phase difference detection pixel 52B obtained by dividing the photoelectric conversion unit of one pixel 51 into two.
- a lens 51 is provided across these.
- the phase difference detection pixel 52A receives the light beam that has passed through half of the pupil region of the imaging lens 1
- the phase difference detection pixel 52B receives the light beam that has passed through the remaining half of the pupil region of the imaging lens 1. It is the composition to do.
- phase difference pixel lines in which the pixel 51 including the phase difference detection pixel 52A and the phase difference detection pixel 52B are arranged in the row direction X are provided in the column direction Y in the AF area 53. Reliability determination is performed with two phase difference pixel lines as one block. Note that the microlenses ML having the same position in the row direction X in the block are all at a distance close to receiving light from the same subject region.
- each phase difference detection pixel 52A (shaded pixel in the figure) of the phase difference pixel line of the first row in the block, and diagonally downward to the right with respect to each phase difference detection pixel 52A.
- the phase difference detection pixel 52B (shaded pixel in the figure) of the phase difference pixel line in the second row arranged in the direction is defined as a pixel pair P1.
- each phase difference detection pixel 52A (pixels not shaded in the drawing) of the phase difference pixel line of the second row in the block and the phase difference detection pixels 52A are arranged in an obliquely upper right direction.
- the phase difference detection pixel 52B (pixels not shaded in the figure) in the first row of the phase difference pixel lines is defined as a pixel pair P2.
- each phase difference detection pixel 52A of the phase difference pixel line in the first row in the block and the phase difference detection pixel 52B adjacent to the right of each phase difference detection pixel 52A are defined as a pixel pair P3.
- each phase difference detection pixel 52A of the phase difference pixel line in the second row in the block and the phase difference detection pixel 52B adjacent to the right side of each phase difference detection pixel 52A are defined as a pixel pair P4.
- the detection signal of the phase difference detection pixel 52A and the phase difference detection pixel A signal obtained by adding the detection signal of the pixel 52 ⁇ / b> B may be handled as a signal output from the pixel 51.
- not only some G pixels 51 but also all pixels 51 may be divided into two.
- the pixel pair used for reliability determination can be changed depending on the subject color, and high-precision phase difference AF is possible.
- phase difference AF the phase difference detection pixels of the color with high reliability.
- the possibility that phase difference AF is performed can be increased, and the accuracy of phase difference AF can be improved.
- phase difference detection pixel 52A and the phase difference detection pixel 52B are provided under one microlens ML, the phase difference detection pixel 52A and the phase difference detection pixel 52B are provided. As compared with the configuration in which the microlenses ML are separately provided, the number of imaging pixels can be increased.
- signals for one pixel can be obtained by adding signals at the phase difference detection pixel 52A and the phase difference detection pixel 52B at substantially the same position, pixel interpolation processing becomes unnecessary, and the imaging image quality is improved. Can be improved.
- a digital camera is taken as an example of the imaging device, but an embodiment of a smartphone with a camera as the imaging device will be described below.
- FIG. 18 shows an appearance of a smartphone 200 that is an embodiment of the imaging apparatus of the present invention.
- a smartphone 200 illustrated in FIG. 18 includes a flat housing 201, and a display input in which a display panel 202 as a display unit and an operation panel 203 as an input unit are integrated on one surface of the housing 201. Part 204 is provided.
- Such a housing 201 includes a speaker 205, a microphone 206, an operation unit 207, and a camera unit 208.
- the configuration of the housing 201 is not limited thereto, and for example, a configuration in which the display unit and the input unit are independent can be employed, or a configuration having a folding structure and a slide mechanism can be employed.
- FIG. 19 is a block diagram showing a configuration of the smartphone 200 shown in FIG.
- the main components of the smartphone include a wireless communication unit 210, a display input unit 204, a call unit 211, an operation unit 207, a camera unit 208, a storage unit 212, and an external input / output unit. 213, a GPS (Global Positioning System) receiving unit 214, a motion sensor unit 215, a power supply unit 216, and a main control unit 220.
- a wireless communication function for performing mobile wireless communication via a base station device BS (not shown) and a mobile communication network NW (not shown) is provided.
- the wireless communication unit 210 performs wireless communication with the base station apparatus BS accommodated in the mobile communication network NW according to an instruction from the main control unit 220. Using this wireless communication, transmission and reception of various file data such as audio data and image data, e-mail data, and reception of Web data and streaming data are performed.
- the display input unit 204 controls the main control unit 220 to display images (still images and moving images), character information, and the like to visually transmit information to the user and to detect user operations on the displayed information.
- a so-called touch panel which includes a display panel 202 and an operation panel 203.
- the display panel 202 uses an LCD (Liquid Crystal Display), an OELD (Organic Electro-Luminescence Display), or the like as a display device.
- LCD Liquid Crystal Display
- OELD Organic Electro-Luminescence Display
- the operation panel 203 is a device that is placed so that an image displayed on the display surface of the display panel 202 is visible and detects one or more coordinates operated by a user's finger or stylus.
- a detection signal generated due to the operation is output to the main control unit 220.
- the main control unit 220 detects an operation position (coordinates) on the display panel 202 based on the received detection signal.
- the display panel 202 and the operation panel 203 of the smartphone 200 exemplified as an embodiment of the imaging apparatus of the present invention integrally constitute a display input unit 204.
- the arrangement 203 covers the display panel 202 completely.
- the operation panel 203 may have a function of detecting a user operation even in an area outside the display panel 202.
- the operation panel 203 includes a detection area (hereinafter referred to as a display area) for an overlapping portion that overlaps the display panel 202 and a detection area (hereinafter, a non-display area) for an outer edge portion that does not overlap the other display panel 202. May be included).
- the operation panel 203 may include two sensitive areas of the outer edge portion and the other inner portion. Further, the width of the outer edge portion is appropriately designed according to the size of the housing 201 and the like.
- the position detection method employed in the operation panel 203 include a matrix switch method, a resistance film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, a capacitance method, and the like. You can also
- the call unit 211 includes a speaker 205 and a microphone 206, converts user's voice input through the microphone 206 into voice data that can be processed by the main control unit 220, and outputs the voice data to the main control unit 220. 210 or the audio data received by the external input / output unit 213 is decoded and output from the speaker 205.
- the speaker 205 can be mounted on the same surface as the display input unit 204 and the microphone 206 can be mounted on the side surface of the housing 201.
- the operation unit 207 is a hardware key using a key switch or the like, and receives an instruction from the user.
- the operation unit 207 is mounted on the side surface of the housing 201 of the smartphone 200 and is turned on when pressed with a finger or the like, and turned off when the finger is released with a restoring force such as a spring. It is a push button type switch.
- the storage unit 212 includes a control program and control data of the main control unit 220, application software, address data that associates the name and telephone number of a communication partner, transmitted / received e-mail data, Web data downloaded by Web browsing, The downloaded content data is stored, and streaming data and the like are temporarily stored.
- the storage unit 212 includes an internal storage unit 217 built in the smartphone and an external storage unit 218 having a removable external memory slot.
- Each of the internal storage unit 217 and the external storage unit 218 constituting the storage unit 212 includes a flash memory type (hard memory type), a hard disk type (hard disk type), a multimedia card micro type (multimedia card micro type), This is realized using a storage medium such as a card type memory (for example, MicroSD (registered trademark) memory), a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.
- a flash memory type hard memory type
- hard disk type hard disk type
- multimedia card micro type multimedia card micro type
- a storage medium such as a card type memory (for example, MicroSD (registered trademark) memory), a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.
- the external input / output unit 213 serves as an interface with all external devices connected to the smartphone 200, and communicates with other external devices (for example, universal serial bus (USB), IEEE 1394, etc.) or a network.
- external devices for example, universal serial bus (USB), IEEE 1394, etc.
- a network for example, Internet, wireless LAN, Bluetooth (registered trademark), RFID (Radio Frequency Identification), Infrared Data Association (IrDA) (registered trademark), UWB (Ultra Wideband) (registered trademark) ZigBee) (registered trademark, etc.) for direct or indirect connection.
- an external device connected to the smartphone 200 for example, a wired / wireless headset, a wired / wireless external charger, a wired / wireless data port, a memory card (Memory card) connected via a card socket, or a SIM (Subscriber).
- Identity Module Card / UIM (User Identity Module Card) card external audio / video equipment connected via audio / video I / O (Input / Output) terminal, external audio / video equipment connected wirelessly, yes / no
- the external input / output unit 213 transmits data received from such an external device to each component inside the smartphone 200, or allows the data inside the smartphone 200 to be transmitted to the external device. Can do.
- the GPS receiving unit 214 receives GPS signals transmitted from the GPS satellites ST1 to STn in accordance with instructions from the main control unit 220, executes positioning calculation processing based on the received GPS signals, and calculates the latitude of the smartphone 200 , A position consisting of longitude and altitude is detected.
- the GPS reception unit 214 can acquire position information from the wireless communication unit 210 or the external input / output unit 213 (for example, a wireless LAN), the GPS reception unit 214 can also detect the position using the position information.
- the motion sensor unit 215 includes, for example, a three-axis acceleration sensor, and detects the physical movement of the smartphone 200 in accordance with an instruction from the main control unit 220. By detecting the physical movement of the smartphone 200, the moving direction and acceleration of the smartphone 200 are detected. The detection result is output to the main control unit 220.
- the power supply unit 216 supplies power stored in a battery (not shown) to each unit of the smartphone 200 in accordance with an instruction from the main control unit 220.
- the main control unit 220 includes a microprocessor, operates according to a control program and control data stored in the storage unit 212, and controls each unit of the smartphone 200 in an integrated manner.
- the main control unit 220 includes a mobile communication control function that controls each unit of the communication system and an application processing function in order to perform voice communication and data communication through the wireless communication unit 210.
- the application processing function is realized by the main control unit 220 operating according to the application software stored in the storage unit 212.
- Examples of the application processing function include an infrared communication function for controlling the external input / output unit 213 to perform data communication with the opposite device, an e-mail function for transmitting / receiving e-mails, and a web browsing function for browsing web pages. .
- the main control unit 220 has an image processing function such as displaying video on the display input unit 204 based on image data (still image or moving image data) such as received data or downloaded streaming data.
- the image processing function is a function in which the main control unit 220 decodes the image data, performs image processing on the decoding result, and displays an image on the display input unit 204.
- the main control unit 220 executes display control for the display panel 202 and operation detection control for detecting a user operation through the operation unit 207 and the operation panel 203.
- the main control unit 220 displays an icon for starting application software, a software key such as a scroll bar, or a window for creating an e-mail.
- a software key such as a scroll bar, or a window for creating an e-mail.
- the scroll bar refers to a software key for accepting an instruction to move the display portion of a large image that does not fit in the display area of the display panel 202.
- the main control unit 220 detects a user operation through the operation unit 207 or accepts an operation on the icon or an input of a character string in the input field of the window through the operation panel 203. Or a display image scroll request through a scroll bar.
- the main control unit 220 causes the operation position with respect to the operation panel 203 to overlap with the display panel 202 (display area) or other outer edge part (non-display area) that does not overlap with the display panel 202.
- a touch panel control function for controlling the sensitive area of the operation panel 203 and the display position of the software key.
- the main control unit 220 can also detect a gesture operation on the operation panel 203 and execute a preset function in accordance with the detected gesture operation.
- Gesture operation is not a conventional simple touch operation, but an operation that draws a trajectory with a finger or the like, designates a plurality of positions at the same time, or combines these to draw a trajectory for at least one of a plurality of positions. means.
- the camera unit 208 includes configurations other than the external memory control unit 20, the recording medium 21, the display control unit 22, the display unit 23, and the operation unit 14 in the digital camera shown in FIG.
- the captured image data generated by the camera unit 208 can be recorded in the storage unit 212 or output through the input / output unit 213 or the wireless communication unit 210.
- the camera unit 208 is mounted on the same surface as the display input unit 204, but the mounting position of the camera unit 208 is not limited thereto, and may be mounted on the back surface of the display input unit 204. .
- the camera unit 208 can be used for various functions of the smartphone 200.
- an image acquired by the camera unit 208 can be displayed on the display panel 202, or the image of the camera unit 208 can be used as one of operation inputs of the operation panel 203.
- the position can also be detected with reference to an image from the camera unit 208.
- the optical axis direction of the camera unit 208 of the smartphone 200 is determined without using the triaxial acceleration sensor or in combination with the triaxial acceleration sensor. It is also possible to determine the current usage environment.
- the image from the camera unit 208 can also be used in the application software.
- the position information acquired by the GPS receiver 214 to the image data of the still image or the moving image, the voice information acquired by the microphone 206 (the text information may be converted into voice information by the main control unit or the like), Posture information and the like acquired by the motion sensor unit 215 can be added and recorded in the recording unit 212, or output through the input / output unit 213 and the wireless communication unit 210.
- the solid-state imaging device 5 is used as the imaging device of the camera unit 208, and the main control unit 220 performs the processing illustrated in FIGS. Contrast AF that achieves both is possible.
- the disclosed imaging apparatus is an imaging apparatus having an imaging element that images a subject through an imaging optical system including a focus lens, and the imaging element is a pair of light beams that have passed through different parts of the pupil region of the imaging optical system.
- a first signal detection unit that detects a signal corresponding to one of the first and second signal detection units that detect a signal corresponding to the other of the pair of light beams.
- a first focus control for moving the focus lens to a focus position determined based on detection signals of the signal detection unit and the second signal detection unit; and a light within a predetermined range of movement of the focus lens. Second moving the focus lens to an in-focus position determined on the basis of the contrast of a captured image captured by the image sensor at each moving position by an arbitrary distance along the axial direction.
- the focus control unit performs any one of the focus control, and the first focus control or the second focus control, the first signal detection unit and the second focus control are performed.
- the focus control determination unit determined by the information generated using the detection signal of the signal detection unit and the second focus control, the movement range and the above are determined according to the information A control unit that variably controls at least the arbitrary distance among the arbitrary distances in the movement range.
- the contrast is increased by increasing the arbitrary distance.
- the focusing speed by the AF method can be increased.
- the contrast AF method is used by reducing the arbitrary distance. Focusing accuracy can be increased.
- the focusing accuracy and the focusing speed by the contrast AF method can be made compatible.
- the disclosed imaging apparatus includes: a first signal detection unit group including a plurality of the first signal detection units arranged in a phase difference detection direction by the first signal detection unit and the second signal detection unit; and The first signal output from the first pair of signal detection units consisting of the second signal detection units arranged at the same distance in the same direction with respect to the signal detection units of the first signal detection unit group.
- the correlation calculation result of the detection signal of the first signal detection unit group and the detection signal of the second signal detection unit group and the signal detection units of the first signal detection unit group are arranged at the same distance in the same direction.
- the second signal detection unit group composed of a plurality of the first signal detection units arranged in the detection direction and the signal detection units of the second signal detection unit group are different from the same direction.
- Signal detection unit group comprising the second signal detection units arranged at the same distance in the direction
- the reliability of the correlation calculation result is determined based on the detection signal of the first signal detection unit group output from the second pair and the correlation calculation result of the detection signal of the second signal detection unit group.
- An information generation unit that generates a reliability determination value for the information as the information, and the focus control determination unit determines the first focus control and the second focus according to the magnitude of the reliability determination value.
- the control unit determines whether to perform control, and when the control unit determines to perform the second focus control, the control unit performs the second focus control according to the magnitude of the reliability determination value.
- the factor determined to be performed is determined, and when the factor is caused by the frequency of the subject image, the arbitrary distance is reduced as compared with the case where the factor is not caused by the frequency of the subject image.
- the arbitrary distance becomes small, so that the in-focus position can be determined with high accuracy. Further, when the above factor is not due to the frequency of the subject image, the arbitrary distance becomes large, so that the subject can be focused at high speed.
- the control unit has a factor other than the frequency of the subject image, the reliability of the correlation calculation result based on the reliability determination value is equal to or higher than a first threshold, and
- the factor is other than the subject image frequency, and the reliability of the correlation calculation result based on the reliability determination value is first.
- the factor is other than the frequency of the subject image, the reliability of the correlation calculation result based on the reliability determination value is greater than or equal to the first threshold, and the phase difference Is less than the second threshold value, the above-mentioned arbitrary distance is increased as compared with.
- control unit is configured such that the factor is other than the frequency of the subject image, and the reliability of the correlation calculation result based on the reliability determination value is equal to or higher than a first threshold.
- the moving range is narrower than the maximum movable range of the focus lens.
- control unit narrows the moving range to a maximum movable range of the focus lens when the factor is due to the frequency of the subject image.
- the disclosed imaging apparatus includes a first signal detection unit group including a plurality of the first signal detection units arranged in a phase difference detection direction by the first signal detection unit and the second signal detection unit. , And a first pair of signal detection units composed of the second signal detection units arranged at the same distance in the same direction with respect to the signal detection units of the first signal detection unit group.
- the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit and the signal detection unit of the first signal detection unit group in the same direction For a second signal detection unit group composed of a plurality of the first signal detection units arranged at the same distance and arranged along the detection direction, and each signal detection unit of the second signal detection unit group From the second signal detector arranged at the same distance in a direction different from the same direction Based on the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit output from the second pair of the signal detection unit group.
- a generation unit is provided.
- the focusing control determination unit determines whether to perform the first focusing control or the second focusing control according to the magnitude of the reliability determination value. When it is determined that the second focus control is performed, the control unit determines the factor determined to perform the second focus control according to the magnitude of the reliability determination value. When the factor is caused by the frequency of the subject image, the arbitrary distance is made smaller than when the factor is not caused by the frequency of the subject image.
- the arbitrary distance becomes small, so the evaluation value of contrast AF can be acquired in fine steps.
- the accuracy of focusing control by the contrast AF method can be increased.
- the reliability based on the reliability determination value is increased, the arbitrary distance is increased, and therefore the speed of the focusing control can be increased.
- the focus control unit when it is determined that the second focus control is to be performed, the focus control unit is configured to focus on a subject whose main component is the detection direction of the phase difference.
- the execution priority of the first algorithm for determining the focus position and the second algorithm for determining the focus position for focusing on the subject whose main component is the direction orthogonal to the detection direction of the phase difference is the reliability determination value. It is determined according to the size of.
- the main subject is a subject whose main component is the phase difference detection direction
- only the first algorithm is performed, or the first algorithm is prioritized and then the second algorithm is performed.
- the in-focus accuracy can be increased.
- the disclosed imaging apparatus includes a first signal detection unit group including a plurality of the first signal detection units arranged in a phase difference detection direction by the first signal detection unit and the second signal detection unit. , And a first pair of signal detection units composed of the second signal detection units arranged at the same distance in the same direction with respect to the signal detection units of the first signal detection unit group.
- the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit and the signal detection unit of the first signal detection unit group in the same direction For a second signal detection unit group composed of a plurality of the first signal detection units arranged at the same distance and arranged along the detection direction, and each signal detection unit of the second signal detection unit group From the second signal detector arranged at the same distance in a direction different from the same direction Based on the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit output from the second pair of the signal detection unit group.
- a reliability determination value for generating a reliability determination value for determining the reliability of the first focus control performed using the detection signal of each signal detection unit of each of the one pair and the second pair In the moving image capturing mode that includes the generation unit and keeps focusing on the main subject, the focus control determination unit sends the reliability determination value to the reliability determination value generation unit after the second focus control ends.
- the reliability of the first focus control based on the reliability determination value is less than a threshold value, it is determined that the second focus control is performed again.
- the imaging element includes the first signal detection unit and the second signal detection unit arranged in a direction intersecting the detection direction with respect to the first signal detection unit.
- a plurality of signal detection unit pairs wherein the plurality of signal detection unit pairs include a first signal detection unit pair and a second signal detection unit pair in which the positional relationship between the first signal detection unit and the second signal detection unit is opposite to each other;
- the information generation unit includes a plurality of pair lines in which the first signal detection unit pair and the second signal detection unit pair are alternately arranged in the detection direction.
- the first signal detection unit pair included in any pair line is the first pair
- the second signal detection unit pair included in the arbitrary pair line is the second pair.
- the signal detection unit included in the arbitrary pair line is detected as described above.
- the reliability determination with one group in the state divided into two groups of signal detectors having the same position in the direction orthogonal to the direction as the first pair and the other group as the second pair Find the value.
- the reliability determination value can be obtained using the detection signals of the signal detection units included in the two closest lines among the lines including the signal detection unit.
- the number of lines from which signals are read out can be minimized, and the time until focusing is completed can be shortened.
- the disclosed focus control method is a focus control method by an image pickup apparatus having an image pickup device that picks up an image of a subject through an image pickup optical system including a focus lens, and the image pickup device has different pupil regions of the image pickup optical system.
- a first signal detector that detects a signal corresponding to one of the pair of light beams that has passed through the portion; and a second signal detection that detects a signal corresponding to the other light beam of the pair of light beams.
- the contrast is increased by increasing the arbitrary distance.
- the focusing speed by the AF method can be increased.
- the contrast AF method is used by reducing the arbitrary distance. Focusing accuracy can be increased.
- the focusing accuracy and the focusing speed by the contrast AF method can be made compatible.
- the disclosed focus control method includes: a first signal detection unit including a plurality of first signal detection units arranged in a phase difference detection direction by the first signal detection unit and the second signal detection unit; Output from the first pair of signal detection units consisting of the second signal detection units arranged at the same distance in the same direction with respect to the signal detection units of the unit group and the first signal detection unit group The correlation calculation result of the detection signal of the first signal detection unit group and the detection signal of the second signal detection unit group and the respective signal detection units of the first signal detection unit group in the same direction For a second signal detection unit group composed of a plurality of the first signal detection units arranged at the same distance and arranged along the detection direction, and each signal detection unit of the second signal detection unit group From the second signal detector arranged at the same distance in a direction different from the same direction The correlation calculation result based on the detection signal of the first signal detection unit group output from the second pair of the signal detection unit group and the correlation calculation result of the detection signal of the second signal detection unit group.
- An information generation step for generating a reliability determination value for determining the reliability of the first focus control and the first focus control according to the magnitude of the reliability determination value In the control step, when it is determined that the second focus control is to be performed, the control step determines the second focus control depending on the magnitude of the reliability determination value. 2 is determined, and when the factor is due to the frequency of the subject image, the arbitrary distance is compared with the case where the factor is not due to the frequency of the subject image. It is to make it smaller.
- the disclosed focus control method includes a first signal detection unit group including a plurality of the first signal detection units arranged in a phase difference detection direction by the first signal detection unit and the second signal detection unit. , And a first pair of signal detection units composed of the second signal detection units arranged at the same distance in the same direction with respect to the signal detection units of the first signal detection unit group.
- the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit and the signal detection unit of the first signal detection unit group in the same direction For a second signal detection unit group composed of a plurality of the first signal detection units arranged at the same distance and arranged along the detection direction, and each signal detection unit of the second signal detection unit group From the second signal detection unit arranged at the same distance in a direction different from the same direction. Based on the ratio of the integrated value of the detection signal of the first signal detection unit and the integrated value of the detection signal of the second signal detection unit output from the second pair of the signal detection unit group, the first signal detection unit group.
- Information generation that generates, as the information, a reliability determination value for determining the reliability of the first focus control performed using the detection signal of each signal detection unit of each of the pair and the second pair Steps are provided.
- the present invention is highly convenient and effective when applied to a digital camera or the like.
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Abstract
Description
図14は、図1に示す固体撮像素子5のAFエリア53にある位相差検出用画素52A及び52Bの配列の変形例を示す図である。
図15は、図1に示す固体撮像素子5のAFエリア53にある位相差検出用画素52A及び52Bの配列の変形例を示す図である。
図16は、図1に示す固体撮像素子5のAFエリア53にある位相差検出用画素52A及び52Bの配列の変形例を示す図である。
図17は、図1に示す固体撮像素子5のAFエリア53の構成の変形例を示す図である。
2 絞り
5 固体撮像素子
11 システム制御部(合焦制御部、合焦制御決定部、制御部)
18 コントラストAF処理部
19 位相差AF処理部(情報生成部、信頼度判定値生成部)
50 受光面
51 画素
52,52A,52B 位相差検出用画素
53 AFエリア
P1,P2,P3,P4 画素ペア
Claims (13)
- フォーカスレンズを含む撮像光学系を通して被写体を撮像する撮像素子を有する撮像装置であって、
前記撮像素子は、前記撮像光学系の瞳領域の異なる部分を通過した一対の光束のうちの一方の光束に応じた信号を検出する第1の信号検出部と、前記一対の光束のうちの他方の光束に応じた信号を検出する第2の信号検出部とを含み、
前記第1の信号検出部及び前記第2の信号検出部の検出信号に基づいて決められた合焦位置に前記フォーカスレンズを移動させる第1の合焦制御と、前記フォーカスレンズを予め決められた移動範囲で光軸方向に沿って任意距離ずつ移動させ、各移動位置で前記撮像素子によって撮像される撮像画像のコントラストに基づいて決められた合焦位置に前記フォーカスレンズを移動させる第2の合焦制御と、のいずれかを行う合焦制御部と、
前記第1の合焦制御と前記第2の合焦制御のどちらを行うかを、前記第1の信号検出部及び前記第2の信号検出部の検出信号を用いて生成した情報によって決定する合焦制御決定部と、
前記第2の合焦制御を行うことが決定された場合に、前記情報に応じて、前記移動範囲と前記移動範囲における前記任意距離のうち少なくとも前記任意距離を可変制御する制御部と、を備える撮像装置。 - 請求項1記載の撮像装置であって、
前記第1の信号検出部及び前記第2の信号検出部による位相差の検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第1の信号検出部群、及び、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第1のペアから出力される前記第1の信号検出部群の検出信号と前記第2の信号検出部群の検出信号の相関演算結果と、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置されかつ前記検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第2の信号検出部群、及び、前記第2の信号検出部群の各信号検出部に対して前記同一方向とは異なる方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第2のペアから出力される前記第1の信号検出部群の検出信号と前記第2の信号検出部群の検出信号の相関演算結果とに基づいて、前記相関演算結果の信頼度を判定するための信頼度判定値を前記情報として生成する情報生成部を備え、
前記合焦制御決定部は、前記信頼度判定値の大きさによって、前記第1の合焦制御と前記第2の合焦制御のどちらを行うかを決定し、
前記制御部は、前記第2の合焦制御を行うことが決定された場合に、前記信頼度判定値の大きさにより、前記第2の合焦制御を行うことが決定された要因を判定し、前記要因が被写体像の周波数によるものである場合に、前記要因が被写体像の周波数によるものでない場合と比較して前記任意距離を小さくする撮像装置。 - 請求項2記載の撮像装置であって、
前記制御部は、前記要因が被写体像の周波数によるもの以外であり、前記信頼度判定値に基づく前記相関演算結果の信頼度が第一の閾値以上であり、かつ、前記相関演算結果としての位相差が第二の閾値以上の場合に、
前記要因が被写体像の周波数によるもの以外であり、かつ、前記信頼度判定値に基づく前記相関演算結果の信頼度が第一の閾値未満である場合、又は、前記要因が被写体像の周波数によるもの以外であり、前記信頼度判定値に基づく前記相関演算結果の信頼度が第一の閾値以上であり、かつ、前記位相差が第二の閾値未満の場合、と比較して前記任意距離を大きくする撮像装置。 - 請求項2又は3記載の撮像装置であって、
前記制御部は、前記要因が被写体像の周波数によるもの以外であり、かつ、前記信頼度判定値に基づく前記相関演算結果の信頼度が第一の閾値以上である場合に、前記移動範囲を前記フォーカスレンズの移動可能な最大範囲よりも狭くする撮像装置。 - 請求項2~4のいずれか1項記載の撮像装置であって、
前記制御部は、前記要因が被写体像の周波数によるものである場合に、前記移動範囲を前記フォーカスレンズの移動可能な最大範囲よりも狭くする撮像装置。 - 請求項1記載の撮像装置であって、
前記第1の信号検出部及び前記第2の信号検出部による位相差の検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第1の信号検出部群、及び、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第1のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比と、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置されかつ前記検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第2の信号検出部群、及び、前記第2の信号検出部群の各信号検出部に対して前記同一方向とは異なる方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第2のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比とに基づいて、前記第1のペア及び前記第2のペアのそれぞれの各信号検出部の検出信号を用いて行われる前記第1の合焦制御の信頼度を判定するための信頼度判定値を前記情報として生成する情報生成部を備える撮像装置。 - 請求項6記載の撮像装置であって、
前記合焦制御決定部は、前記信頼度判定値の大きさによって、前記第1の合焦制御と前記第2の合焦制御のどちらを行うかを決定し、
前記制御部は、前記第2の合焦制御を行うことが決定された場合に、前記信頼度判定値の大きさにより、前記第2の合焦制御を行うことが決定された要因を判定し、前記要因が被写体像の周波数によるものである場合に、前記要因が被写体像の周波数によるものでない場合と比較して前記任意距離を小さくする撮像装置。 - 請求項6又は7記載の撮像装置であって、
前記第2の合焦制御を行うことが決定された場合に、前記合焦制御部は、前記位相差の検出方向を主成分とする被写体に合焦させるための合焦位置決定の第1アルゴリズムと、前記位相差の検出方向に直交する方向を主成分とする被写体に合焦させるための合焦位置決定の第2アルゴリズムの実行優先度を、前記信頼度判定値の大きさに応じて決定する撮像装置。 - 請求項2~5のいずれか1項記載の撮像装置であって、
前記第1の信号検出部及び前記第2の信号検出部による位相差の検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第1の信号検出部群、及び、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第1のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比と、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置されかつ前記検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第2の信号検出部群、及び、前記第2の信号検出部群の各信号検出部に対して前記同一方向とは異なる方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第2のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比とに基づいて、前記第1のペア及び前記第2のペアのそれぞれの各信号検出部の検出信号を用いて行われる前記第1の合焦制御の信頼度を判定するための信頼度判定値を生成する信頼度判定値生成部を備え
主要被写体に合焦し続ける動画撮像モードにおいて、前記合焦制御決定部は、前記第2の合焦制御が終了した後に、前記信頼度判定値生成部に前記信頼度判定値を生成させ、前記信頼度判定値に基づく前記第1の合焦制御の信頼度が閾値未満であれば、再び前記第2の合焦制御を行うことを決定する撮像装置。 - 請求項2~9のいずれか1項記載の撮像装置であって、
前記撮像素子は、前記第1の信号検出部とその第1の信号検出部に対して前記検出方向に沿って交差する方向に配置された前記第2の信号検出部との信号検出部ペアを複数含み、
前記複数の信号検出部ペアは、前記第1の信号検出部と前記第2の信号検出部との位置関係が互いに逆になる第1の信号検出部ペアと第2の信号検出部ペアを含み、
前記撮像素子は、前記第1の信号検出部ペアと前記第2の信号検出部ペアが前記検出方向に交互に並ぶペアラインを複数有し、
前記情報生成部は、任意の前記ペアラインに含まれる前記第1の信号検出部ペアを前記第1のペアとし、前記任意のペアラインに含まれる前記第2の信号検出部ペアを前記第2のペアとする、又は、前記任意のペアラインに含まれる信号検出部を前記検出方向に直交する方向での位置が同じ信号検出部からなる2つのグループに分けた状態での一方のグループを前記第1のペアとし、他方のグループを前記第2のペアとして、前記信頼度判定値を求める撮像装置。 - フォーカスレンズを含む撮像光学系を通して被写体を撮像する撮像素子を有する撮像装置による合焦制御方法であって、
前記撮像素子は、前記撮像光学系の瞳領域の異なる部分を通過した一対の光束のうちの一方の光束に応じた信号を検出する第1の信号検出部と、前記一対の光束のうちの他方の光束に応じた信号を検出する第2の信号検出部とを含み、
前記第1の信号検出部及び前記第2の信号検出部の検出信号に基づいて決められた合焦位置に前記フォーカスレンズを移動させる第1の合焦制御と、前記フォーカスレンズを予め決められた移動範囲で光軸方向に沿って任意距離ずつ移動させ、各移動位置で前記撮像素子によって撮像される撮像画像のコントラストに基づいて決められた合焦位置に前記フォーカスレンズを移動させる第2の合焦制御と、のいずれかを行う合焦制御ステップと、
前記第1の合焦制御と前記第2の合焦制御のどちらを行うかを、前記第1の信号検出部及び前記第2の信号検出部の検出信号を用いて生成した情報によって決定する合焦制御決定ステップと、
前記第2の合焦制御を行うことが決定された場合に、前記情報に応じて、前記移動範囲と前記移動範囲における前記任意距離のうち少なくとも前記任意距離を可変制御する制御ステップと、を備える合焦制御方法。 - 請求項11記載の合焦制御方法であって、
前記第1の信号検出部及び前記第2の信号検出部による位相差の検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第1の信号検出部群、及び、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第1のペアから出力される前記第1の信号検出部群の検出信号と前記第2の信号検出部群の検出信号の相関演算結果と、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置されかつ前記検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第2の信号検出部群、及び、前記第2の信号検出部群の各信号検出部に対して前記同一方向とは異なる方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第2のペアから出力される前記第1の信号検出部群の検出信号と前記第2の信号検出部群の検出信号の相関演算結果とに基づいて、前記相関演算結果の信頼度を判定するための信頼度判定値を前記情報として生成する情報生成ステップを備え、
前記合焦制御決定ステップでは、前記信頼度判定値の大きさによって、前記第1の合焦制御と前記第2の合焦制御のどちらを行うかを決定し、
前記制御ステップでは、前記第2の合焦制御を行うことが決定された場合に、前記信頼度判定値の大きさにより、前記第2の合焦制御を行うことが決定された要因を判定し、前記要因が被写体像の周波数によるものである場合に、前記要因が被写体像の周波数によるものでない場合と比較して前記任意距離を小さくする合焦制御方法。 - 請求項11記載の合焦制御方法であって、
前記第1の信号検出部及び前記第2の信号検出部による位相差の検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第1の信号検出部群、及び、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第1のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比と、前記第1の信号検出部群の各信号検出部に対して同一方向に同一距離で配置されかつ前記検出方向に沿って並ぶ複数の前記第1の信号検出部からなる第2の信号検出部群、及び、前記第2の信号検出部群の各信号検出部に対して前記同一方向とは異なる方向に同一距離で配置された前記第2の信号検出部からなる信号検出部群の第2のペアから出力される前記第1の信号検出部の検出信号の積算値及び前記第2の信号検出部の検出信号の積算値の比とに基づいて、前記第1のペア及び前記第2のペアのそれぞれの各信号検出部の検出信号を用いて行われる前記第1の合焦制御の信頼度を判定するための信頼度判定値を前記情報として生成する情報生成ステップを備える合焦制御方法。
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