JP6976723B2 - Imaging device and its control method, external device, communication system - Google Patents

Description

The present invention relates to a communication process of an image pickup device and an external device thereof that communicate with each other.

In an image pickup device such as an interchangeable lens camera or a video camera, measures are taken to prevent image quality deterioration such as chromatic aberration, reduction in peripheral illumination, and optical distortion due to the optical characteristics of the lens device. When the signal processing unit of the image pickup device main body performs correction, it is necessary to prepare optical correction data for each type of lens device mounted on the main body unit. In recent years, with the increasing number of functions of camera image processing technology, the types of optical correction data such as optical aberration information and individual difference information have increased, and the data storage capacity has tended to increase.

On the other hand, the exchange of optical correction data between the lens device and the main body of the image pickup device is performed by serial communication when the image pickup device is started up or when the lens device is replaced. Therefore, as the amount of optical correction data increases, the communication time becomes longer in proportion to the increase, and the time from the start-up time of the image pickup apparatus to the time when shooting becomes possible becomes longer. As a result, there is a concern that the user may lose the opportunity to shoot.

The apparatus disclosed in Patent Document 1 transfers optical correction data corresponding to a specific optical condition from the lens apparatus to the camera body in a plurality of times. If there is optical correction data that has not been transferred, the optical correction data that has been transferred is interpolated to the camera body to generate the optical correction data. Even if the amount of data increases, the optical correction process can be performed by the optical correction data interpolated by the camera body, so that the possibility that the user loses a shooting opportunity can be reduced.

Japanese Unexamined Patent Publication No. 2011-123413

In the prior art disclosed in Patent Document 1, since the optical correction data generated by interpolation is used, an error between the optical correction data and the optical correction data stored in the lens device becomes a problem. That is, if the generated error is large, the quality of the captured image after correction is likely to be impaired. The generated captured image may be an image that does not meet the photographer's intention.

Further, as a method of reducing the time required for serial communication while increasing the storage capacity of the optical correction data, there is a method of increasing the communication speed. However, the upper limit of the communication speed is determined by the transmission path between the image pickup device main body and the lens device. For this reason, it may not be possible to increase the communication speed in consideration of compatibility, for example, in the case of a combination of a conventional lens device and an image pickup device main body.
An object of the present invention is to reduce the possibility that a user loses a shooting opportunity by suppressing a delay in mutual communication between a device main body of an imaging device and an external device that can be attached to the device main body.

The device of one embodiment of the present invention is an image pickup device capable of communicating with an external device mounted on the main body of the device, and is a receiving means for receiving compressed data and uncompressed data from the external device. A first calculation means for calculating the reception time for receiving the compressed data and the uncompressed data, a decompression means for decompressing the received compressed data, and a decompression time for decompression of the compressed data. 2. The calculation means and the control means for selecting either the first control for acquiring the compressed data or the second control for acquiring the uncompressed data when controlling the communication with the external device. , Equipped with. When the sum of the reception time of the compressed data and the decompression time is longer than the threshold time, the control means gives priority to information necessary for photographing and controls to acquire the information from the external device.

According to the present invention, it is possible to reduce the possibility that the user loses a shooting opportunity by suppressing the delay in mutual communication between the device main body of the image pickup device and the external device that can be attached to the device main body.

It is a block diagram which shows the structure of the camera communication system which concerns on 1st Embodiment of this invention. It is a flowchart of the process in the camera communication system of 1st Embodiment. It is a flowchart which shows the division | division communication processing of the lens data in 1st Example. It is a schematic diagram which shows the data of the lens data storage part in 1st Example. It is a block diagram which shows the structure of the camera communication system which concerns on 2nd Embodiment of this invention. It is a flowchart of the process in the camera communication system of 2nd Embodiment. It is a flowchart which shows the division | division communication processing of the lens data in 2nd Example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is applicable to a communication system including an image pickup device, which is a first device, and an accessory device, which is a second device (external device) that is attached to the main body of the device and communicates with each other. .. An interchangeable lens type image pickup system including a lens device as an example of an external device and a device main body to which the lens device can be mounted will be described.

As a method of suppressing the communication time of serial communication while increasing the capacity of optical data held in the storage unit of the lens device, there is a method of reducing the amount of information by performing coded compression of optical data for communication. In this case, the image pickup apparatus main body needs to perform the expansion processing of the coded optical data received from the lens apparatus. If the total of the communication time and the time required for the expansion process is longer than the time required for the communication of the unencoded optical correction data, the timing at which the optical correction process can be started is delayed, and as a result, the shooting opportunity may be lost. There is sex. On the contrary, when the sum of the communication time and the time required for the decompression process is shorter than the time required for the communication of the unencoded optical correction data, the compression becomes an effective method. Hereinafter, a system will be described in which information encoded and compressed from a lens device is received by the image pickup device main body and decompressed, and uncompressed information is selected and used as optical correction information.

[First Example]
The communication process according to the first embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a block diagram showing a configuration of a camera communication system according to the present embodiment. The image pickup system includes an image pickup device main body (hereinafter, simply referred to as a device main body) 100 and a lens device 150 that can be attached to the image pickup device main body. The lens device 150 includes an optical member such as a lens group and a diaphragm (not shown), and constitutes an image pickup optical system for forming an image of light from a subject.

The lens data storage unit 151 of the lens device 150 is a storage unit that mainly holds coded information unique to the lens device 150. The lens data storage unit 151 is composed of a compressed data storage unit 151a and an uncompressed data storage unit 151b. The compressed data storage unit 151a holds the compressed lens data, and the uncompressed data storage unit 151b holds the uncompressed lens data. As the compressed data and uncompressed data stored in the lens data storage unit 151, specifically, there are optical correction information of the lens and correction information related to the drive control of the lens. The uncompressed data storage unit 151b stores the lens ID, which is identification information unique to the lens device 150, the amount of information held, the communication speed, information indicating the compression rate of coding, and the like. The detailed breakdown of the data of the lens data storage unit 151 will be described with reference to FIG.

FIG. 4 is a schematic diagram showing a specific example of the information held by the lens data storage unit 151. The uncompressed data storage unit 151b holds the following information 401 to 403 as uncompressed data.

-Header information 401
This is information indicating the lens ID, which is identification information unique to the lens device 150, the amount of information held by the lens data storage unit 151, the communicable speed of the lens device 150, the compression rate of the compression information described later, and the like. The lens ID is, for example, an identification number that can identify a plurality of lens devices. In addition to this, there is information indicating the amount of uncompressed data, information indicating a compression method of compressed data, and the like. At the start of communication, the device main body 100 first receives the header information 401 from the lens device 150.

-Correction information 402 required for real-time shooting
Specifically, it is information used for controlling the lens drive mechanism such as focus control and image stabilization, and lens correction information necessary for displaying an image on the screen of the display unit of the apparatus main body 100.

-Correction information required for the extended function of the image pickup device 403
Specifically, it is lens correction information required for post-processing of an image.

The compressed data storage unit 151a holds the information 404 in which the correction information 403 necessary for the extended function is compressed. Not limited to this embodiment, the compressed data storage unit 151a may hold the information obtained by compressing the correction information 402 and 403 as the compressed information. When the decompression speed of the decompression unit 105 of the compressed data, which will be described later, is high, higher speed communication is possible. However, in the camera communication system, it is desired to reduce the storage capacity of the lens data storage unit 151 as much as possible. Therefore, in this embodiment, the configuration in which the correction information 402 is stored in the lens data storage unit 151 as uncompressed information will be described. Further, regarding the uncompressed correction information 403, if the information is not used in the image pickup apparatus of the conventional product, only the compressed correction information 404 may be stored in the lens data storage unit 151.

The transmission unit 152 (FIG. 1) of the lens device 150 acquires the information stored in the lens data storage unit 151 and transmits it to the device main body unit 100. The device main body 100 includes a receiving unit 101, and receives information transmitted from the lens device 150. The received information is the information stored in the lens data storage unit 151. The reception time calculation unit 102 calculates the time (reception time) required for reception when the reception unit 101 receives the information stored in the lens data storage unit 151. The reception time calculation unit 102 calculates the reception time based on the amount of information of the lens data storage unit 151 and the communicable speed.

The compressed data holding unit 103 temporarily holds the compressed information (FIG. 4: correction information 404) received by the receiving unit 101. Further, the compressed data holding unit 103 stores the received uncompressed information (FIG. 4: information 401, 402, 403) in a buffer memory (not shown). Alternatively, the uncompressed information may be held by the decompression data holding unit 106 described later.

The decompression unit 105 acquires compression information from the compression data holding unit 103, decompresses it, and generates information (decompression information) that has been decompressed. The extension time calculation unit 104 calculates the time (elongation time) required for the extension process by the extension unit 105. The decompression time can be calculated from the amount of compression information and the compression rate, and the decompression processing capacity of the decompression unit 105.

The decompression data holding unit 106 holds the decompression data processed by the decompression unit 105. The data buffer memory held by the compressed data holding unit 103 and the decompressed data holding unit 106 may be shared. Further, the decompressed data holding unit 106 may hold the uncompressed information (FIG. 4: information 401, 402, 403).

The control unit 107 controls a communication method with the lens device 150 according to a predetermined condition from three time information, that is, a reception time, an extension time, and a predetermined time. The predetermined time is mainly the time required from the start-up time of the image pickup apparatus to the time when shooting can be started as a camera communication system. The data indicating a predetermined time is information stored in a buffer memory (not shown) included in the apparatus main body 100, and is predetermined for each imaging apparatus. The control unit 107 includes a CPU (Central Processing Unit) and performs various processes by executing a program read from the memory. The control unit 107 switches the communication method by selecting either a first control for acquiring compressed data from the lens device 150 or a second control for acquiring uncompressed data. The main parts of the image sensor, signal processing unit, recording processing unit, operation unit, display unit, and the like included in the device main body 100 will be described by omitting detailed explanations thereof.

Next, specific control performed by the control unit 107 will be described with reference to FIGS. 2 and 3. FIG. 2 is a flowchart illustrating the process in this embodiment. FIG. 3 is a flowchart illustrating a process of dividing and communicating the lens data shown in S208 of FIG.

In S201 of FIG. 2, communication between the device main body 100 and the lens device 150 starts. This communication starts from a situation where the device main body 100 does not know the type of the lens device 150. For example, when the power of the device main body 100 is turned on or the lens device 150 is attached to the device main body 100. Start when it is done.

In S202, the receiving unit 101 receives the identification information of the lens device 150, the compression method and amount of compressed data, the communication speed, the information 401 regarding the compression rate of coding, and the like. In S203, the decompression time calculation unit 104 calculates the decompression time from the information amount and the compression rate of the compression information received in S202 and the performance of the decompression unit 105. The calculated extension time is referred to as T2.

In S204, the reception time calculation unit 102 calculates the communication time from the information amount and the communication speed of the compressed information received in S202. The calculated communication time is referred to as T3. In S205, the control unit 107 compares the sum of T2 and T3 with a predetermined threshold time (denoted as T1). The threshold time T1 is mainly an allowable time from the start time of the image pickup apparatus to the time when shooting can be started. The control unit 107 determines whether or not T1 is larger than the sum of T2 and T3. When T1 is larger than the sum of T2 and T3, it means that the sum of the communication time and the extension time is within the time acceptable for the camera communication system. In this case, the compressed information may be communicated each time and decompressed, so the process proceeds to S206. On the other hand, when T1 is equal to or less than the sum of T2 and T3, it means that the extension time is an unacceptable time for the camera communication system. In this case, the start of shooting is delayed due to the decompression of the compressed information, and the user may lose the shooting opportunity, so the process proceeds to S208.

In S206, the apparatus main body 100 receives the correction information 402 and the compression information 404 necessary for real-time shooting from the lens apparatus 150. Regarding the compression information 404, the decompression unit 105 performs data decompression processing and proceeds to the processing of S207. In S207, the control unit 107 is in a state where it is possible to receive a shooting instruction by a user operation. That is, in the camera communication system, it is possible to start the shooting operation of the device main body 100. At this point, acceptance of the imaging timing trigger starts. After executing this process, the process proceeds to S209 to complete the process.

In S208, the control unit 107 controls to divide and communicate the lens data. S208 will be described later with reference to FIG. After executing the process of S208, the process proceeds to S209 to complete the process.

FIG. 3 is a flowchart illustrating a process of dividing the lens data of S208 of FIG. 2 and performing communication. Processing is started in S301, and in S302, the apparatus main body 100 receives correction information 402 necessary for real-time shooting from the lens apparatus 150. After the reception of the uncompressed information is completed, the process proceeds to S303.

In S303, the apparatus main body 100 is in a state where shooting can be started. At this point, acceptance of the imaging timing trigger starts. Even in a state where all the lens data has not been received, the apparatus main body 100 receives the correction information 402 that is preferentially acquired so that the user does not miss the shooting opportunity, and can start shooting. After executing the process of S303, the process proceeds to the process of S304.

In S304, the reception time calculation unit 102 calculates the communication time required for the communication of the correction information 403 from the information amount and the communication speed of the uncompressed information received in S302. The calculated communication time is referred to as T4. In S305, the reception time calculation unit 102 calculates the communication time required for the communication of the compressed information 404 from the information amount and the communication speed of the compressed information, which is the information received in S302. The calculated communication time is referred to as T5.

In S306, the decompression time calculation unit 104 calculates the decompression time required for decompression of the compressed information 404 from the information amount and the compression rate of the compression information received in S302 and the performance of the decompression unit 105. The calculated extension time is referred to as T6. In S307, the control unit 107 compares the relationship between T4, T5 and T6. A determination process is performed as to whether or not T4 is smaller than the sum of T5 and T6. When T4 is smaller than the sum of T5 and T6, the control unit 107 determines that the uncompressed communication is faster, and proceeds to S308. On the other hand, when T4 is equal to or greater than the sum of T5 and T6, the control unit 107 determines that the communication by compression is faster, and proceeds to S309.

In S308, the apparatus main body 100 receives the correction information 403 required for the extended function, and then proceeds to the process of S311. Further, in S309, the apparatus main body 100 receives the compressed information 404, and then proceeds to the process of S310. In S310, the decompression unit 105 performs decompression processing of the compression information 404. After executing the process of S310, the process proceeds to the process of S311.

In S311 the control unit 107 determines whether or not the imaging was performed during the period in which the steps S304 to S310 are executed. If it is determined that shooting is being performed during this period, the process proceeds to S312. On the other hand, if the shooting is not performed during the above period, the process proceeds to S313.

In S312, the control unit 107 performs image processing using the correction information 403 or 404 necessary for the extended function. After image processing (image recovery processing, etc.) is performed on all the images taken during the period in which the steps S304 to S310 are executed, the process proceeds to S313 to complete a series of sequences.
According to this embodiment, optimum communication can be performed according to the combination of the lens device and the image pickup device main body, and the user can prevent the user from missing a shooting opportunity when the device is activated.

[Second Example]
Next, a second embodiment will be described with reference to FIGS. 5 to 7. In this embodiment, communication processing when the lens device includes a compression circuit will be described. In the case of this embodiment, it is possible to reduce the amount of information of the lens data that needs to be stored in the lens device 150 as compared with the first embodiment. By using the same reference numerals as those already used for the components having the same functions as those of the first embodiment, detailed explanations thereof will be omitted, and differences will be mainly described.

FIG. 5 is a block diagram showing the configuration of the camera communication system of this embodiment. The compression time calculation unit 501 in the device main body 100 calculates the time (compression time) required for the compression process by the compression unit 551 of the lens device 150. The information 401 held by the lens apparatus 150 includes information on the compression performance, the compression method, and the compressible compression ratio. The compression time calculation unit 501 can calculate the compression time by receiving the information 401 by the camera communication unit 502.

The camera communication unit 502 can communicate various information with the lens communication unit 553 in the lens device 150. The camera communication unit 502 includes a reception unit that receives data from the lens communication unit 553 and a transmission unit that transmits a compression command to the compression unit 551, which will be described later.

The lens device 150 includes a compression unit 551, a lens uncompressed data storage unit 552, and a lens communication unit 553. The compression unit 551 compresses the lens uncompressed data stored in the storage unit 552. The lens uncompressed data storage unit 552 mainly holds the encoded lens-specific information as uncompressed information. Unlike the first embodiment, the storage unit 552 of this embodiment does not store the compressed data related to the lens device 150. Specifically, the lens uncompressed data is optical correction information and correction information related to lens drive control. In addition, information indicating the lens ID, which is identification information unique to the lens device 150, the amount of information held by the storage unit 552, the possible communication speed of the lens device 150, the compression rate that the compression unit 551 can compress, and the like. It is included.

The lens communication unit 553 includes a transmission unit that transmits information stored in the storage unit 552 to the camera communication unit 502, and a reception unit that receives a compression command from the device main unit 100 to the compression unit 551. The compression unit 551 performs data compression processing according to a compression command from the device main body unit 100.

Specific control performed by the control unit 107 of this embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart illustrating processing in the camera communication system of this embodiment. FIG. 7 is a flowchart of a process of dividing and communicating lens data (compressed data) executed in S607 of FIG. In FIG. 6, since each process of S201 to S209 has already been described in FIG. 2 of the first embodiment, the description thereof will be omitted. In this embodiment, the processing of S601 is added after the processing of S204.

In S601, the control unit 107 determines whether or not the lens device 150 includes the compression unit 551. Whether or not the lens device 150 includes the compression unit 551 is described in the acquired information 401, and the control unit 107 can be determined by communication in S202. If it is determined that the lens device 150 does not include the compression unit 551, the process proceeds to S205. On the other hand, if it is determined that the lens device 150 includes the compression unit 551, the process proceeds to S602.

In S602, the compression time calculation unit 501 calculates the compression time from the information on the compression rate or the compression speed of the data compression by the compression unit 551 received in S202. The acquired compression time is expressed as T7. Here, when compression at a plurality of compression rates is possible, the compression time at each compression rate is acquired. Next, the process proceeds to S603.

In S603, the control unit 107 compares the compression time T7 and the decompression time T2 for each compression method. The control unit 107 determines the compression rate so that the sum of the compression time T7 and the expansion time T2 is the shortest. After determining the compression ratio, the process proceeds to S604.

In S604, the control unit 107 compares the sum of T2, T3, and T7 with the predetermined threshold time T1. T1 is mainly the time (allowable time) from the start-up time of the image pickup apparatus to the time when shooting can be started. A determination process is performed to determine whether T1 is larger than the sum of T2, T3, and T7. When T1 is larger than the sum of T2, T3, and T7, the sum of the communication time and the extension time is within the time acceptable for the camera communication system. In this case, the compressed information may be communicated each time and decompressed, so the process proceeds to S605. On the other hand, when the total of the communication time, the decompression time, and the compression time is equal to or more than the threshold time, that is, when T1 is equal to or less than the sum of T2, T3, and T7, the decompression time becomes an unacceptable time for the camera communication system. ing. In this case, the start of shooting is delayed due to the decompression of the compressed information, and the user may miss the shooting opportunity, so the process proceeds to S607.

In S605, the compression unit 551 compresses the data stored in the lens uncompressed data storage unit 552 at the compression rate determined in S603. The decompression unit 105 of the device main body 100 performs decompression processing of the received compressed data, and proceeds to S606. In S606, the shooting operation can be started, and at this point, the acceptance of the imaging timing trigger starts. This process is the same as the process of S207, and proceeds to S209 after execution.

In S607, a process of dividing and communicating the lens data is executed. After executing this process, the process proceeds to S209. Next, with reference to FIG. 7, S607 of FIG. 6 will be described.

Processing starts in S701. In the following processing, the control unit 107 of the device main body 100 makes a determination. An instruction regarding compression of the lens device 150 to the compression unit 551 is notified to the lens communication unit 553 by the camera communication unit 502.

In S702, the control unit 107 calculates the amount of lens data in which the total of T2, T3, and T7 is larger than the predetermined threshold time T1. This amount of lens data is expressed as Y. After the calculation, the lens data amount Y is notified to the compression unit 551, and the process proceeds to S703. In S703, the compression unit 551 performs a compression process of data corresponding to the lens data amount Y calculated in S702, and proceeds to the process of S704 after executing the compression process.

In S704, the camera communication unit 502 divides and receives the compressed lens data compressed by S703 and reduced in size. After executing this process, the process proceeds to S705, and the decompression unit 105 performs decompression processing of the compressed lens data received in S704. After executing the process of S705, the process proceeds to the process of S706.

In S706, the shooting can be started, and at this point, the acceptance of the imaging timing trigger starts. Even if the device body 100 has not received all the lens data, the lens data related to real-time shooting is preferentially acquired so that the user does not miss a shooting opportunity, and shooting can be started. It becomes. After executing the process of S706, the process proceeds to the process of S707.

In S707, the compression unit 551 performs compression processing of the remaining lens data that has not been compressed in S703. After executing the process of S707, the process proceeds to the process of S708. In S708, the camera communication unit 502 receives the lens data compressed in S707, and then proceeds to the process of S709. In S709, the decompression unit 105 performs decompression processing of the compressed lens data received in S708. After executing the process of S709, the process proceeds to the process of S710.

In S710, the control unit 107 determines whether or not the imaging was performed during the period in which the steps S707 to S709 are executed. If it is determined that shooting is being performed during this period, the process proceeds to S711, and if shooting is not performed, the process proceeds to S712. In S711, image processing is performed using all the acquired lens data (correction information). After the image processing of all the images taken in the period of S707 to S709 is executed, the process proceeds to S712 to complete a series of sequences.

According to this embodiment, in addition to the effect of the first embodiment, the storage capacity of the lens data storage unit of the lens device 150 can be reduced.
In the present embodiment, in a system in which the device main body receives coded and compressed information from the lens device and uses the expanded information as optical correction information, it is possible to suppress the delay in mutual communication between the lens device and the device main body. can.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the gist thereof, and the external device can be attached to the main body of the device. It can be applied to communication between various accessor devices and the main body of the device.

100 Device main unit 102 Reception time calculation unit 104 Extension time calculation unit 105 Expansion unit 107 Control unit 150 Lens device 151 Lens data storage unit 501 Compression time calculation unit 551 Compression unit

Claims (12)

An image pickup device that can communicate with an external device mounted on the main body of the device.
A receiving means for receiving compressed data and uncompressed data from the external device, and
A first calculation means for calculating the reception time required for receiving the compressed data and the uncompressed data, respectively.
Decompression means for decompressing the received compressed data,
A second calculation means for calculating the decompression time required for decompression of the compressed data, and
A control means for selecting either a first control for acquiring the compressed data or a second control for acquiring the uncompressed data when controlling communication with the external device is provided.
The control means is characterized in that when the sum of the reception time of the compressed data and the decompression time is longer than the threshold time, the information necessary for shooting is prioritized and acquired from the external device. Imaging device. When the sum of the reception time of the compressed data and the decompression time is shorter than the reception time of the uncompressed data, the control means selects the first control, and receives the compressed data and the decompression time. The image pickup apparatus according to claim 1, wherein when the total of the uncompressed data is longer than the reception time of the uncompressed data, the second control is selected. An external device provided with a lens that can be attached to the main body of the image pickup apparatus according to claim 1 or 2.
A storage means for storing the compressed data and the uncompressed data, and
It has a transmission means for transmitting the compressed data and the uncompressed data to the main body of the apparatus, and has a transmission means.
The storage means stores at least the identification information of the external device, the data amount information of the compressed data, and the communicable speed information of the transmission means.
When the external device is attached to the device main body, the transmitting means transmits the identification information, the data amount information of the compressed data, and the communicable speed information of the transmitting means to the device main body. An external device characterized by transmitting. A communication system equipped with an image pickup device and an external device that can be attached to the main body of the device.
The external device is
A storage means for storing compressed and uncompressed data,
A transmission means for transmitting the compressed data and the uncompressed data to the main body of the apparatus is provided.
The main body of the device is
A receiving means for receiving compressed data and uncompressed data from the external device, and
A first calculation means for calculating the reception time required for receiving the compressed data and the uncompressed data, respectively.
Decompression means for decompressing the received compressed data,
A second calculation means for calculating the decompression time required for decompression of the compressed data, and
A control means for selecting either a first control for acquiring the compressed data or a second control for acquiring the uncompressed data when controlling communication with the external device is provided.
The control means is characterized in that when the sum of the reception time of the compressed data and the decompression time is longer than the threshold time, the information necessary for shooting is prioritized and acquired from the external device. Communications system. An image pickup device that can communicate with an external device mounted on the main body of the device.
A communication means that communicates with the external device,
A first calculation means for calculating the communication time required for communication with the external device by the communication means, and
A decompression means for decompressing compressed data received from the external device, and
A second calculation means for calculating the decompression time required for decompression of the compressed data, and
An acquisition means for acquiring the compression time required for data compression when the data is compressed by the compression means provided in the external device, and an acquisition means.
It has a control means for controlling communication with the external device, and has.
The control means is characterized in that when the sum of the communication time, the extension time, and the compression time is longer than the threshold time, the control means controls to acquire information necessary for shooting from the external device. .. An external device that can be attached to the main body of the image pickup device according to claim 5.
A storage means for storing uncompressed data,
With the compression means for compressing the uncompressed data,
Have a communicating means for transmitting the data compressed by said compressing means to said apparatus main body,
If the external device is attached to the apparatus main body, said communication means external device you and transmitting the information of the compressibility or compression rate of data compression by said compression means to said apparatus body .. The external device is equipped with a lens and
When the external device is attached to the main body of the device, the identification information of the external device, the information of the data amount of the uncompressed data, the information of the speed at which the communication means can communicate, and the compression means. The external device according to claim 6 , wherein the information of the compressible method is transmitted to the main body of the device. A communication system equipped with an image pickup device and an external device that can be attached to the main body of the device.
The external device is
A storage means for storing uncompressed data,
A compression means for compressing the uncompressed data and
A communication means for transmitting data compressed by the compression means to the main body of the apparatus is provided.
When the external device is attached to the device main body, the communication means transmits information on the compression rate or compression speed of data compression by the compression means to the device main body.
The main body of the device is
A communication means that communicates with the external device,
A first calculation means for calculating the communication time required for communication with the external device by the communication means, and
A decompression means for decompressing compressed data received from the external device, and
A second calculation means for calculating the decompression time required for decompression of the compressed data, and
An acquisition means for acquiring the compression time required for data compression when the data is compressed by the compression means, and an acquisition means.
A control means for controlling communication with the external device is provided.
The control means is
When the sum of the communication time, the decompression time, and the compression time is shorter than the threshold time, the data compressed by the compression means is received at the determined compression rate, and the decompression means controls the decompression.
A communication system characterized in that when the total of the communication time, the decompression time, and the compression time is equal to or longer than a threshold time, the data compressed by the compression means is divided and received. A communication system equipped with an image pickup device and an external device that can be attached to the main body of the device.
The external device is
A storage means for storing uncompressed data,
A compression means for compressing the uncompressed data and
A communication means for transmitting data compressed by the compression means to the main body of the apparatus is provided.
The main body of the device is
A communication means that communicates with the external device,
A first calculation means for calculating the communication time required for communication with the external device by the communication means, and
A decompression means for decompressing compressed data received from the external device, and
A second calculation means for calculating the decompression time required for decompression of the compressed data, and
An acquisition means for acquiring the compression time required for data compression when the data is compressed by the compression means, and an acquisition means.
A control means for controlling communication with the external device is provided.
The communication system is characterized in that when the sum of the communication time, the extension time, and the compression time is longer than the threshold time, the control means controls to acquire information necessary for shooting from the external device. .. It is a control method executed by an image pickup device capable of communicating with an external device mounted on the main body of the device.
A step in which the receiving means receives compressed data and uncompressed data from the external device, and
A step in which the first calculation means calculates the reception time required for receiving the compressed data and the uncompressed data, respectively.
The process of decompressing the received compressed data by the decompression means,
The second calculation means is a step of calculating the decompression time required for decompression of the compressed data, and
When the control means controls communication with the external device, it has a control step of selecting one of a first control for acquiring the compressed data and a second control for acquiring the uncompressed data. death,
In the control step, when the total of the reception time of the compressed data and the decompression time is longer than the threshold time, the control means controls to preferentially acquire the information necessary for shooting from the external device. A control method for an image pickup device, characterized in that. It is a control method executed by an image pickup device capable of communicating with an external device mounted on the main body of the device.
With the external device
The process by which the compression means compresses the uncompressed data stored in the storage means,
It has a step of transmitting data compressed by the compression means to the apparatus main body by the communication means.
When the external device is attached to the device main body, the communication means transmits information on the compression rate or compression speed of data compression by the compression means to the device main body.
At the device body
The process in which the communication means communicates with the external device,
A step in which the first calculation means calculates the communication time required for communication with the external device by the communication means, and
A step in which the decompression means decompresses the compressed data received from the external device, and
The second calculation means is a step of calculating the decompression time required for decompression of the compressed data, and
A step of acquiring the compression time required for data compression when the data is compressed by the compression means provided in the external device, and a step of acquiring the compression time.
The control means has a control step of controlling communication with the external device.
In the control step, the control means
When the sum of the communication time, the decompression time, and the compression time is shorter than the threshold time, the data compressed by the compression means is received at the determined compression rate, and the decompression means controls the decompression. ,
When the total of the communication time, the decompression time, and the compression time is equal to or longer than the threshold time, a control method for an image pickup apparatus is performed in which control is performed to divide and receive the data compressed by the compression means. .. It is a control method executed by an image pickup device capable of communicating with an external device mounted on the main body of the device.
The process in which the communication means communicates with the external device,
A step in which the first calculation means calculates the communication time required for communication with the external device by the communication means, and
A step in which the decompression means decompresses the compressed data received from the external device, and
The second calculation means is a step of calculating the decompression time required for decompression of the compressed data, and
A step of acquiring the compression time required for data compression when the data is compressed by the compression means provided in the external device, and a step of acquiring the compression time.
The control means has a control step of controlling communication with the external device.
In the control step, when the total of the communication time, the extension time, and the compression time is longer than the threshold time, the control means controls to acquire information necessary for photographing from the external device. A characteristic method of controlling an image pickup device.

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