JP4235424B2 - Camera and camera system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera that performs image processing on an image obtained by an image sensor.
[0002]
[Prior art]
The above-mentioned camera, so-called digital camera, basically performs photoelectric conversion of an optical image formed by a photographing lens by an image pickup device such as a CCD (Charge Coupled Device) and performs image processing on an image signal as an output thereof. It is stored in a recording medium such as a memory card.
[0003]
Among such digital cameras, there is also a digital camera with interchangeable lenses. In an interchangeable lens camera system, lenses with various focal lengths can be freely combined depending on the photographing situation, and a photographing lens for a interchangeable lens camera using a film can often be used.
[0004]
As described above, in a digital camera that can use various photographing lenses, a photographed image is obtained due to inherent optical characteristics of the photographing lens, such as distortion (distortion aberration) of the photographing lens, shading (peripheral dimming), and chromatic aberration of magnification. May not be the image intended by the photographer.
[0005]
“Distortion” refers to the aberration in which an image of an object projected through a taking lens does not resemble the object, for example, a straight line is distorted. “Shading” refers to the periphery of the screen compared to the center of the screen. This means that the amount of light is reduced and darkened. “Chromatic chromatic aberration” means that when the light from the subject is decomposed into a plurality of color lights and imaged on the imaging surface, the refractive index varies depending on the wavelength. Appears as a difference in magnification and causes color shift. If these aberrations are present, an image of the subject cannot be accurately captured.
[0006]
As a solution to the above problem, Patent Document 1 provides a circuit for storing information relating to optical characteristics of the photographing lens such as distortion information and shading information in the photographing lens, and stores the information when the photographing lens is attached to the camera. Sends information on all optical characteristics stored in the circuit to the camera, corrects the image signal obtained from the image sensor using the information on these optical characteristics in the camera, and stores a high-quality image in the memory A camera system has been proposed.
[0007]
Further, Patent Document 2 includes a circuit for storing a shading correction coefficient in the photographing lens, and the camera reads the stored correction coefficient in the process of A / D conversion of the analog image signal obtained from the image sensor. Therefore, a camera system that performs shading correction has been proposed.
[0008]
Further, in Patent Document 3, a storage circuit for storing information on chromatic aberration of magnification or distortion is provided in the photographic lens, and the camera reads information from the storage circuit to correct the image signal from the image sensor, thereby obtaining a high-quality image. There has been proposed a camera system for storing the image in a memory.
[0009]
Further, in Patent Document 4, a photographic lens is provided with a storage circuit that stores the total spectral characteristic data of the photographic lens and the camera, and the camera transmits a readout command of the total spectral characteristic data to the photographic lens side, thereby A camera system is also disclosed in which the lens receives the stored spectral data and transmits the stored spectral data to the camera, and the camera controls the white balance based on the received spectral data.
[0010]
[Patent Document 1]
JP-A-2-123879
[Patent Document 2]
JP-A-6-197266
[Patent Document 3]
JP-A-6-292207
[Patent Document 4]
Japanese Patent Publication No. 7-83481
[0011]
[Problems to be solved by the invention]
In the camera system proposed in each of the above publications, information relating to the optical characteristics of the taking lens represented by distortion, shading, chromatic aberration of magnification and the like is stored in advance in a storage circuit provided in the taking lens for each taking lens. Is configured to read the information by accessing the memory circuit of the photographic lens, or send all information stored in the memory circuit on the photographic lens side to the camera side and store it when the photographic lens is attached to the camera. It has been.
[0012]
By the way, in an interchangeable lens digital camera system, it is necessary to perform an autofocus operation and a photometric operation as an imaging preparation operation at a timing intended by the photographer, but a high speed is required. For this reason, if transmission / reception of information relating to the optical characteristics of the photographic lens used for image processing from the photographic lens to the camera is performed during the imaging preparation operation, the imaging preparation operation may be delayed, which may hinder the rapid photographing.
[0013]
Furthermore, as the pixel pitch of the image sensor becomes smaller, a more accurate autofocus operation is required, so there may be a large amount of information regarding the optical characteristics of the photographic lens sent from the photographic lens to the camera. In this case, since the communication load when transmitting / receiving information on the optical characteristics of the photographing lens increases, it is necessary to further prevent the autofocus operation and the photometry operation from being affected.
[0014]
Some information on the optical characteristics of the photographic lens changes depending on the focusing position, zooming position, and photometric value of the photographic lens, and the optical characteristic information is transmitted and received at the optimum timing considering this. There must be.
[0015]
An object of the present invention is to provide a camera and a camera system capable of improving the image quality of an image obtained by an image pickup element without interfering with an autofocus operation and a photometric operation.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, in a camera that can be attached to and detached from a lens device having storage means that stores information relating to optical characteristics of a photographing optical system and can communicate with the lens device, photographing is performed. An image sensor that photoelectrically converts a subject image formed by the optical system, an image processing unit that corrects an image signal output from the image sensor using information about optical characteristics of the imaging optical system, a photometric operation for the subject, and A first instruction for starting an imaging preparation sequence including focusing control of the imaging optical system; Charge accumulation in the image sensor and Image signal corrected by image processing means of recoding media To Record including After the release switch operated to give the second instruction to start the imaging sequence and the imaging preparation sequence in accordance with the first instruction, in response to the second instruction When charge accumulation at the image sensor starts in the imaging sequence , Information on optical characteristics stored in the storage means is transmitted from the lens device to the camera. System I have a means.
[0017]
Also according to the second instruction When charge accumulation in the image sensor is started in the imaging sequence, the lens device is caused to transmit information on optical characteristics. be able to .
[0018]
As a result, high-quality shooting with correction processing according to the optical characteristics of the photographic optical system without affecting the photometric operation, focus control, etc. in the imaging preparation sequence by communicating information about the optical characteristics of the photographic optical system An image (recorded image) can be obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a configuration of an interchangeable lens digital camera system according to an embodiment of the present invention. The camera system includes a photographic lens 10 and a digital camera 40. The taking lens 10 is a zoom lens that can be attached to and detached from the camera 40.
[0020]
In the photographing lens 10 of the present embodiment, the photographing optical system for forming a subject image is composed of four groups of lenses 11, 12, 13, and 14. The lens 12 is a lens for zooming, and the lens 13 is a lens for focusing. An aperture unit 15 is disposed in the photographing optical system.
[0021]
A light beam from a subject (not shown) is guided to the movable mirror 41 in the camera 40 through the lenses 11 and 12, the aperture unit 15, and the lenses 13 and 14. In addition, a zoom encoder 17, a focus encoder 18, and an aperture encoder 20 for detecting the positions of the lenses 12 and 13 and the aperture state of the aperture unit 15 are provided in the photographing lens 10, and are connected to the lens control circuit 21. Has been.
[0022]
Connected to the lens control circuit 21 are a zoom drive circuit 24 that drives a zoom motor 25, a focus drive circuit 26 that drives a focus motor 27, and an aperture drive circuit 28 that drives an aperture motor 29. It operates according to a control signal from the control circuit 21.
[0023]
The lens control circuit 21 is connected to a lens switch input circuit 30 and a nonvolatile memory (EEPROM) 31.
[0024]
Further, the lens control circuit 21 is provided with a communication controller 21 a that performs communication with the camera 40 via the communication line 32 and the communication contact 33.
[0025]
The lens control circuit 21 controls the zoom motor 25 via the zoom drive circuit 24 to drive the lens 12. The initial position and stop position of the lens 12 are detected by counting pulse signals output from the zoom encoder 17 according to the movement of the lens 12. Then, the zoom motor 25 is feedback-controlled using the detected position information.
[0026]
The lens control circuit 21 controls the focus motor 27 via the focus drive circuit 26 to drive the lens 13. The initial position and stop position of the lens 13 are detected by counting the pulse signals output from the focus encoder 18 according to the movement of the lens 13. Then, the focus motor 27 is feedback-controlled using the detected position information.
[0027]
Further, the lens control circuit 21 controls the operation of the aperture unit 15 via the aperture drive circuit 28. The initial state and the aperture position of the aperture unit 15 are detected by counting the pulse signals output from the aperture encoder 20 according to the operating state of the aperture unit 15. Then, the aperture motor 29 is feedback-controlled using the detected operation state information.
[0028]
In this manner, the lens control circuit 21 controls the zoom drive circuit 24, the focus drive circuit 26, and the aperture drive circuit 28 based on the outputs of the zoom encoder 17, the focus encoder 18, and the aperture encoder 20, and also performs overall control. Various processing necessary for the operation is performed. The lens control circuit 21 Communication controller 21a, the communication line 32 and the communication contact 33 are communicated as needed with the camera 40 and reflected in the control of each circuit in the photographic lens 10, and information on the optical characteristics of the photographic lens 10 to be described later and the photographic lens 10 Status information The It transmits to the camera 40.
[0029]
The nonvolatile memory 31 includes information on the optical characteristics of the photographing optical system unique to the photographing lens 10, specifically, information on distortion, information on shading, information on chromatic aberration of magnification, and the like. Is stored according to Note that the information regarding the inherent optical characteristics of the photographic lens 10 may be any information as long as it is information used for correction processing in the image processing process of the image captured by the camera 40.
[0030]
The nonvolatile memory 31 also stores information on optical characteristics necessary for focusing control, which is different from or partially overlapped with information on optical characteristics used in the above-described image processing.
[0031]
The information indicating the state of the photographing lens 10 is information such as the state of various lens switches, the lens position and the aperture state obtained through the encoders.
[0032]
The lens switch input circuit 30 transmits the state of a switch (not shown) provided in the photographing lens 10 to the lens control circuit 21. In the present embodiment, the switch provided on the photographing lens 10 has a zoom selection switch for setting the zoom state to tele, middle, and wide, and when the photographer operates the zoom selection switch. The lens control circuit 21 detects the operation via the lens switch input circuit 30, controls the zoom motor 25 via the zoom drive circuit 24 so as to be in the selected zoom state, and moves the lens 12.
[0033]
Next, the configuration on the camera 40 side will be described. The subject light that has passed through the photographing lens 10 is incident on the movable mirror 41 having a half mirror at the substantially central portion. A sub-mirror 42 that reflects the light beam that has passed through the movable mirror 41 is provided on the central back side of the movable mirror 41. The light beam reflected downward by the sub mirror 42 is separated into two light beams by the separator optical system 43, and two images are formed on the pair of CCD line sensors 44. The separator optical system 43 and the CCD line sensor 44 constitute a focus detection unit for detecting the focus adjustment state (focus detection) of the photographing optical system.
[0034]
The signal that is photoelectrically converted by the CCD line sensor 44 and output is a focus detection circuit. 69 Input focus detection circuit 69 Detects the phase difference between the two images formed on the pair of CCD line sensors 44 and inputs the detection result to the camera control circuit 55. The camera control circuit 55 calculates a focus shift amount (defocus amount) of the photographing optical system based on the input signal representing the phase difference. That is, focus detection by the phase difference detection method is performed. Then, the camera control circuit 55 transmits information representing the calculated defocus amount to the lens control circuit 21 via the communication controller 55a, the communication line 65, and the communication contact 66 provided in the camera control circuit 55.
[0035]
Based on the received defocus amount information, the lens control circuit 21 obtains the driving amount of the lens 13 (that is, the focus motor 27) necessary for obtaining the focus, and drives the focus motor 27 by the driving amount. To do. Thereby, automatic focusing control is performed.
[0036]
In the present embodiment, the case where the camera control circuit 55 transmits the defocus amount information to the lens control circuit 21 has been described. However, the camera control circuit 55 uses the defocus amount information and the optical information of the photographing lens 10 as an example. The driving amount of the lens 13 may be determined based on the information, and information on the determined driving amount may be transmitted to the lens control circuit 21. In this case, by the initial communication when the photographing lens 10 is mounted on the camera 40, the camera control circuit 55 takes in the optical characteristic information of the photographing lens 10 necessary for calculating the driving amount of the lens 13, and the memory (FIG. (Not shown) should be memorized.
[0037]
On the other hand, a focusing plate 46, a pentaprism 47, and an eyepiece optical system 48 that constitute a finder optical system are disposed on the reflected light path of the subject light flux by the movable mirror 41. Further, behind the movable mirror 41, a shutter 50, an optical low-pass filter 51, and an image sensor 52 are arranged. The image sensor 52 is composed of a CCD, a CMOS sensor, or the like, and photoelectrically converts a subject image formed on the light receiving surface and outputs an image signal. The image sensor 52 is driven and controlled by an image processing circuit 62 that has received an imaging command from the camera control circuit 55.
[0038]
When the movable mirror 41 is moved upward and the shutter 50 is opened, a subject image is formed on the image sensor 52 and charge accumulation in the image sensor 52 is started. When the charge accumulation is completed, the shutter 50 is closed.
[0039]
Connected to the camera control circuit 55 are a mirror drive circuit 56, a line sensor drive circuit 57, a focus detection circuit 69, a shutter drive circuit 58, a photometric sensor drive circuit 59, an image processing circuit 62, and a strobe circuit 63, all of which. Controls the operation of the circuit. In addition, a shutter detection circuit 61 and a switch input circuit 64 are connected to the camera control circuit 55.
[0040]
The mirror driving circuit 56 drives the movable mirror 41 so as to advance and retract with respect to the photographing optical path. When the movable mirror 41 is in the photographing optical path, the subject light flux is guided to the finder optical system, and when the movable mirror 41 is retracted from the photographing optical path, the subject light flux is guided to the image sensor 52.
[0041]
The line sensor drive circuit 57 drives the line sensor 44. The shutter drive circuit 58 drives the shutter 50 for controlling the amount of light received by the image sensor 52. Further, a photometric sensor 60 for measuring the luminance of the subject is provided in the vicinity of the upper part of the pen prism 47 and the eyepiece optical system 48. The photometric sensor 60 is driven by a photometric sensor driving circuit 59. The output from the photometric sensor 60 is input to the camera control circuit 55, and the camera control circuit 55 calculates the luminance of the subject light based on the input signal. The shutter detection circuit 61 detects the open / close state of the shutter 50.
[0042]
The image processing circuit 62 converts the image signal (analog signal) output from the image sensor 52 into a digital signal, and then the above-described photographing lens. 10 A correction process using information on the optical characteristics is performed. An image corresponding to the corrected image signal is recorded on a recording medium (not shown) (semiconductor memory, magnetic disk, optical disk, etc.) detachably attached to the camera 40. Details of the image processing circuit 62 will be described later.
[0043]
The strobe circuit 63 drives a light emitting unit (not shown) for illuminating the subject. The switch input circuit 64 detects the states of various operation switches provided in the camera 40 and inputs detection signals to the camera control circuit 55.
[0044]
There is a release switch as an operation switch on the camera 40 side. The release switch outputs a SW1ON signal for starting an imaging preparation operation sequence, which will be described later, by a one-step depression operation, and outputs a SW2ON signal for starting an imaging sequence, which will be described later, by another one-step depression operation.
[0045]
In addition, there is a mode switch as an operation switch on the camera 40 side, and the camera control circuit 55 operates in an imaging mode (aperture priority mode, shutter speed priority mode, program mode, etc.) by operating this mode switch (according to the number of operations). Set.
[0046]
The camera 40 is provided with a power source 68. The power supply 68 supplies power to each circuit in the camera 40 and also supplies power to the photographing lens 10 via the communication contact 66.
[0047]
FIG. 2 shows the configuration of the image processing circuit 62 described above. The image processing circuit 62 includes a control unit 71, an A / D conversion unit 72, an image processing unit 73, a buffer memory unit 74, an external recording unit 75, and a correction value memory unit 76. The In addition, the image processing unit 73, the buffer memory unit 74, the external recording unit 75, and the correction value memory unit 76 are connected by a common data bus 77 so that data can be exchanged. Further, the A / D conversion unit 72, the image processing unit 73 The operations of the buffer memory unit 74, the external recording unit 75, and the correction value memory unit 76 are controlled by the control unit 71 that receives a control signal from the camera control circuit 55. The control unit 71 also performs drive control of the image sensor 52.
[0048]
In FIG. 2, the analog image signal output from the image sensor 52 is converted into a digital signal by the A / D conversion unit 72 and input to the image processing unit 73. The control unit 71 temporarily stores in the correction value memory unit 76 each piece of information (hereinafter referred to as correction data) regarding the optical characteristics of the shooting lens 10 transmitted from the shooting lens 10 side. The image processing unit 73 performs various correction processes such as distortion correction, shading correction, and color correction on the digital image signal input from the A / D conversion unit 72 using the correction data stored in the correction value memory unit 76. And processing such as image compression.
[0049]
Then, the image signal processed by the image processing unit 73 is stored in the buffer memory unit 74 and further transferred to the external recording unit 75, and the recording medium detachably mounted on the camera 40 described above. To be recorded.
[0050]
Next, the operation of the camera 40 (mainly the camera control circuit 55) in this embodiment will be described using the flowchart of FIG. When a power switch (not shown) is turned on, the camera control circuit 55 starts operating.
[0051]
[Step (denoted as S in the figure) 101]
The camera control circuit 55 determines whether or not the SW1ON signal is input from the switch input circuit 64. If it has been input, the process proceeds to the next step 102 to enter the imaging preparation sequence. If not, the process returns to step 101.
[0052]
[Step 102]
If SW1 is ON, the camera control circuit 55 activates the photometric sensor drive circuit 59, and outputs the output from the photometric sensor 60 and the F number of the photographing lens 10 (the lens control circuit 21 according to the ON state of the power switch). The shutter speed and aperture value used in an imaging sequence to be described later are determined.
[0053]
[Step 103]
Next, the camera control circuit 55 activates the line sensor drive circuit 57 and the focus detection circuit 69 and calculates the defocus amount based on the output obtained from the focus detection circuit 69.
[0054]
[Step 104]
The camera control circuit 55 transmits information indicating the defocus amount calculated in step 103 to the lens control circuit 21 as a focus drive command.
[0055]
[Step 105]
Upon receiving from the lens control circuit 21 that the driving of the lens 13 has been completed, the camera control circuit 55 calculates the defocus amount again based on the output from the focus detection circuit 69, and the calculated defocus amount is It is determined whether or not it is within a predetermined allowable range (that is, whether or not it is in focus). If not in focus, the process returns to step 101 again. If in focus, the process proceeds to the next step 106. With this focus determination, the imaging preparation sequence ends.
[0056]
[Step 106]
After the imaging preparation sequence ends, the camera control circuit 55 determines whether or not the SW2 ON signal is input from the switch input circuit 64. If it is not input, the process returns to step 101. If it is input (if the start of the imaging sequence is instructed), the imaging sequence is entered, and the process proceeds to step 107.
[0057]
[Step 107]
The camera control circuit 55 transmits to the lens control circuit 21 a communication command that requests transmission of correction data relating to the optical characteristics of the photographing lens 10 used for image processing in the image processing circuit 62. Here, the correction data requested to be transmitted by the communication command may be a part of the various correction data described above, or may be data corresponding to the aperture value determined in step 102 and the positions of the lenses 12 and 13. Good. As a result, the transmission / reception amount of correction data can be minimized. In this case, the communication command may be different depending on the type of correction data to be requested, or information indicating the aperture value determined in step 102 may be included.
[0058]
The camera control circuit 55 receives the correction data transmitted from the lens control circuit 21 that has received the communication command, and stores the correction data in the correction value memory unit 76 (see FIG. 2) in the image processing circuit 62.
[0059]
[Step 108]
Next, the camera control circuit 55 transmits an aperture drive command for driving the aperture unit 15 to the aperture value determined in step 102 to the lens control circuit 21.
[0060]
[Step 109]
Next, the camera control circuit 55 causes the movable mirror 41 to move up through the mirror drive circuit 56.
[0061]
[Step 110]
Next, the camera control circuit 55 operates the shutter 50 at the shutter speed determined in step 102 through the shutter drive circuit 58. Simultaneously with the shutter opening operation, charge accumulation by photoelectric conversion in the image sensor 52 is started through the control unit 71 of the image processing circuit 62.
[0062]
[Step 111]
When the operation of the shutter 50 is completed (charge accumulation in the image sensor 52 is completed), the camera control circuit 55 transmits a command to drive the aperture unit 15 to the lens control circuit 21 in the open state.
[0063]
[Step 112]
Next, the camera control circuit 55 causes the movable mirror 41 to perform a down operation through the mirror drive circuit 56 and then returns to step 101.
[0064]
In the present embodiment, a case has been described in which the photographic lens 10 is requested to receive correction data necessary for image processing in response to the start of the imaging sequence (input of SW2 ON). When requesting a plurality of types of correction data, a command for requesting transmission of all types of correction data may be transmitted in step 107, and the correction data may be received in a lump. The correction data may be requested or received in a divided manner at any timing until the end of the operation 109.
[0065]
Next, the operation of the taking lens 10 (mainly the lens control circuit 21) will be described with reference to the flowchart of FIG.
[0066]
When the power supply from the camera 40 is started, the lens control circuit 21 is activated, and after the following step 201, the lens control circuit 21 performs the switch operation on the photographing lens 10 side and analyzes the command transmitted from the camera control circuit 55. A lens drive control process and information transmission process are performed according to the result.
[0067]
[Step 201]
The lens control circuit 21 determines whether a signal (zoom selection signal) from the zoom selection switch for changing the focal length is input from the lens switch input circuit 30. If it has been input, the process proceeds to step 202. If it has not been input, the process proceeds to step 203.
[Step 202]
The lens control circuit 21 compares the zoom state (telephoto, middle, or wide) corresponding to the zoom selection signal from the zoom selection switch with the current zoom state. The lens 12 (zoom motor 25) is driven so as to achieve a corresponding zoom state. Thereafter, the process returns to step 201.
[0068]
[Step 203]
The lens control circuit 21 determines whether or not the command transmitted from the camera control circuit 55 is a correction data transmission request command related to the optical characteristics of the photographing lens 10 used for image processing. If it is a correction data transmission request command, the process proceeds to step 204; otherwise, the process proceeds to step 205.
[0069]
[Step 204]
When the lens control circuit 21 determines that it is a correction data transmission request command, the lens control circuit 21 further analyzes what type of correction data the transmission request command requires, and stores the correction data stored in the nonvolatile memory 31. The requested correction data is transmitted to the camera control circuit 55. Thereafter, the process returns to step 201.
[0070]
[Step 205]
The lens control circuit 21 determines whether or not the command transmitted from the camera control circuit 55 is a focus drive command. If it is a focus drive command, the process proceeds to step 206; otherwise, the process proceeds to 207.
[0071]
[Step 206]
The lens control circuit 21 relates to the defocus amount information included in the focus drive command and the optical characteristics of the photographic lens 10 necessary for determining the drive amount of the lens 13 (focus motor 27) stored in the nonvolatile memory 31. The driving amount of the lens 13 (focus motor 27) is calculated based on the information (as described above, information different from or partially overlapped with the correction data used for image processing), and the focus motor corresponding to the calculated driving amount. 27 is driven. Thereafter, the process returns to step 201.
[0072]
[Step 207]
The lens control circuit 21 determines whether or not the command transmitted from the camera control circuit 55 is an aperture drive command. If it is an aperture drive command, the process proceeds to step 208; otherwise, the process proceeds to step 209.
[0073]
[Step 208]
The lens control circuit 21 drives the aperture unit 15 according to the aperture drive command so that the aperture value included in the command is obtained. Thereafter, the process returns to step 201.
[0074]
[Step 209]
Here, processing corresponding to commands other than the above commands and processing for lens control are performed, and the process returns to step 201.
[0075]
As described above, according to the present embodiment, the image signal acquired in the imaging sequence at the start timing of the imaging sequence after the completion of the imaging preparation sequence of the camera 40 (in response to the input of the SW2ON signal). Since correction data related to the optical characteristics unique to the photographing lens 10 used for image processing is transmitted and received, the camera control circuit 55 performs an imaging preparation sequence by increasing the load for requesting and receiving the correction data. Thus, a high-quality captured image (recorded image) can be obtained without any influence on the focusing control and photometry operation (that is, without delay of the imaging preparation sequence).
[0076]
In the present embodiment, the case where the transmission / reception timing of the correction data between the camera and the lens is set as the start timing of the imaging sequence, but the timing at which charge accumulation in the imaging element 52 is started may be used. Further, after completion of the imaging preparation sequence, the correction data may be requested and received without waiting for the input of SW2ON (that is, before entering the imaging sequence).
[0077]
When the correction data is only in accordance with the positions of the lenses 12 and 13 that perform zooming and focusing, the correction data may be requested and received when the positions of the lenses 12 and 13 are determined. .
[0078]
【The invention's effect】
As described above, according to the present invention, the communication of information related to the optical characteristics of the photographic optical system can be performed according to the optical characteristics of the photographic optical system without affecting the photometric operation or the focusing control in the imaging preparation sequence. A high-quality captured image (recorded image) subjected to the correction process can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a digital camera system according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of an image processing circuit of the digital camera system.
FIG. 3 is a flowchart showing an operation of a camera control circuit 55 of the digital camera system.
FIG. 4 is a flowchart showing an operation of a lens control circuit of the digital camera system.
[Explanation of symbols]
10 Shooting lens
11-14 lenses
15 Aperture unit
17 Zoom encoder
18 Focus encoder
20 Aperture encoder
21 Lens control circuit
24 Zoom drive circuit
26 Focus drive circuit
28 Aperture drive circuit
30 Lens switch input circuit
31 Nonvolatile memory
40 cameras
41 Movable mirror
42 Submirror
43 Separator optical system
44 Line sensor
50 shutter
51 Optical low-pass filter
52 Image sensor
62 Image processing circuit

Claims (2)

A camera that can be attached to and detached from a lens apparatus including a storage unit that stores information on optical characteristics of a photographing optical system and can communicate with the lens apparatus,
An image sensor that photoelectrically converts a subject image formed by the photographing optical system;
Image processing means for correcting the image signal output from the image sensor using information relating to optical characteristics of the imaging optical system;
First instruction and the recording medium of the correction processed the image signal by the charge accumulation and the image processing unit in the imaging device to start the image pickup preparation sequence including a focusing control of the light measuring operation and the photographing optical system with respect to the subject a release switch which is operated to perform a second instruction to start the imaging sequence including recording to,
The storage means after the imaging preparation sequence is completed in response to the first instruction and when charge accumulation in the imaging element is started in the imaging sequence in response to the second instruction. camera; and a stored Ru control means information about the optical properties is transmitted from the lens unit to the camera. A camera system comprising: the camera according to claim 1; and a lens device that is detachably attached to the camera and includes a storage unit that stores information on optical characteristics of the photographing optical system.

Images