JP2012009978A - Imaging device - Google Patents

Abstract

The present invention provides a camera system capable of voice recording, which can effectively remove noise data such as a motor driving sound in accordance with a lens attached to the camera even in an interchangeable lens camera. .
Even when a lens is exchanged, noise data suitable for the lens is stored in a flash memory 142, and when a sound collection data is recorded by a microphone 180, a driving sound emitted from the lens is recorded as the noise data. The operation is performed so as to reduce the value.
[Selection] Figure 1

Description

  The present invention relates to an imaging apparatus capable of exchanging lenses, and particularly capable of recording sound.

  Some digital cameras can record external audio when recording moving images. External sound is collected by a microphone provided in the camera, converted into sound data by predetermined signal conversion, and recorded in a storage medium.

  When recording a moving image with a digital camera, there is a problem that the driving sound for focusing and the driving sound for the aperture may be recorded at the same time. In Patent Document 1, the driving sound of the focusing mechanism and the diaphragm mechanism is stored as noise data, and the operation timing of driving of these mechanisms is predicted at the time of voice recording, and the sound collected at the predicted timing is stored. An imaging apparatus is disclosed that performs calculation with noise data and records audio data from which noise has been removed.

JP 2005-228400 A

  However, an interchangeable lens camera system has a focusing mechanism and a diaphragm mechanism on the lens side, and the focusing drive sound and the diaphragm drive sound differ each time the lens is replaced. That is, it is necessary to set noise data every time the lens is replaced.

  An object of the present invention is to solve such a problem and to provide an imaging apparatus capable of removing noise sounds such as focusing drive sound and aperture drive sound even with an interchangeable lens camera.

  In order to achieve the above object, the present invention provides a microphone that converts sound into a sound signal, a determination unit that determines the type of lens to be mounted, and a noise signal corresponding to a noise sound included in the sound signal obtained by the microphone. Information stored in association with the lens type, an operation command output means for outputting an operation command to the lens, and a noise signal stored in the noise information storage means for the operation of the mounted lens. Selecting means for selecting a noise signal corresponding to the generated noise sound; and audio signal processing means for calculating the noise signal selected by the selecting means for the audio signal obtained from the microphone to generate an audio signal with reduced noise. , An imaging apparatus provided with

  That is, each time a lens is replaced, it is determined whether the lens is newly mounted. If noise data is already stored, the noise can be reduced by the stored noise data. If a new lens is mounted, lens focusing driving and aperture driving are performed, and noise data corresponding to the lens is newly stored in the noise information storage means.

  According to the present invention, it is possible to record a sound from which a driving noise sound is removed even if the lens driving sound and the diaphragm driving sound are changed by exchanging the lens.

Block diagram showing electrical configuration of imaging apparatus Flow chart showing operation of imaging device Flow chart showing operation of imaging device The figure which shows an example of the memory map where noise data is stored

  Hereinafter, an interchangeable lens type camera system according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following embodiments, a configuration that enables voice recording that can be handled by an interchangeable lens in an interchangeable lens camera system will be described.

(Configuration of digital camera)
FIG. 1 is a block diagram showing an electrical configuration of the camera system 1 according to the first embodiment. The camera system 1 includes a camera body 100 and an interchangeable lens 200 that can be attached to and detached from the camera body 100. The camera system 1 can perform autofocus control by automatically driving the focus lens 230 and exposure control by automatically driving the aperture 220.

  The camera body 100 includes a CCD image sensor 110, a liquid crystal monitor 120, a camera controller 140, a body mount 150, a power source 160, and a card slot 170.

  The camera controller 140 controls the entire camera system 1 such as the CCD image sensor 110 in response to an instruction from an operation member such as the release button 130. The camera controller 140 transmits a vertical synchronization signal to the timing generator 112. In parallel with this, the camera controller 140 generates an exposure synchronization signal based on the vertical synchronization signal. The camera controller 140 periodically and repeatedly transmits the generated exposure synchronization signal to the lens controller 240 via the body mount 150 and the lens mount 250. The camera controller 140 uses the DRAM 141 as a work memory during control operations and image processing operations.

  The CCD image sensor 110 captures a subject image incident through the interchangeable lens 200 and generates image data. The generated image data is digitized by the AD converter 111. The image data digitized by the AD converter 111 is subjected to various image processing by the camera controller 140. Examples of the various image processing referred to here include gamma correction processing, white balance correction processing, scratch correction processing, YC conversion processing, electronic zoom processing, and JPEG compression processing.

  The CCD image sensor 110 operates at a timing controlled by the timing generator 112. The operation of the CCD image sensor 110 includes a still image capturing operation, a moving image capturing operation, a through image capturing operation, and the like. In the still image capturing operation and the moving image capturing operation, a still image operation is performed when the release button 130 is operated, and a moving image operation is performed when the recording button 131 is operated. Note that a through image is an image that is not recorded on the memory card 171 after imaging. The through image is mainly a moving image, and is displayed on the liquid crystal monitor 120 in order to determine a composition for capturing a still image.

  The card slot 170 can be loaded with a memory card 171. The card slot 170 controls the memory card 171 based on the control from the camera controller 140. The memory card 171 can store image data generated by image processing of the camera controller 140. For example, the memory card 171 can store a JPEG image file. The memory card 171 can output image data or an image file stored therein. The image data or image file output from the memory card 171 is subjected to image processing by the camera controller 140. For example, the camera controller 140 decompresses the image data or image file acquired from the memory card 171 and generates display image data.

  The sound collected by the microphone 180 is converted into an audio signal, amplified by the amplifier 181 and then digitized by AD conversion. The camera controller 140 uses the above-described digitized audio data and noise data stored in the flash memory 142 to generate audio data by predetermined signal processing and store it as an audio file.

  The liquid crystal monitor 120 displays an image indicated by the display image data image-processed by the camera controller 140. The liquid crystal monitor 120 can selectively display both moving images and still images.

  The power supply 160 supplies power for consumption by the camera system 1. The power source 160 may be, for example, a dry battery or a rechargeable battery. Moreover, the power supplied from the outside by the power cord may be supplied to the camera system 1.

  The body mount 150 can be mechanically and electrically connected to the lens mount 250 of the interchangeable lens 200. The body mount 150 can transmit and receive data to and from the interchangeable lens 200 via the lens mount 250. The body mount 150 transmits the exposure synchronization signal received from the camera controller 140 to the lens controller 240 via the lens mount 250. Further, other control signals received from the camera controller 140 are transmitted to the lens controller 240 via the lens mount 250. The body mount 150 transmits a signal received from the lens controller 240 via the lens mount 250 to the camera controller 140. For example, the body mount 150 transmits to the camera controller 140 drive method information regarding the drive method of the focus lens 230 received from the lens controller 240 via the lens mount 250. The body mount 150 supplies the power received from the power supply 160 to the entire interchangeable lens 200 via the lens mount 250.

  The interchangeable lens 200 includes an optical system, a lens controller 240, and a lens mount 250. The optical system of the interchangeable lens 200 includes a diaphragm 220 and a focus lens 230.

  The diaphragm 220 has an opening, and adjusts the size of the opening to adjust the amount of light of the subject image formed by the interchangeable lens 200. The aperture drive motor 221 is driven to change the aperture of the aperture 220 under the control of the lens controller 240.

  The focus lens 230 is a lens for changing the focus state of the subject image formed on the CCD image sensor 110 by the optical system. The focus lens 230 is composed of one or a plurality of lenses.

  The focus motor 233 drives the focus lens 230 to advance and retreat along the optical axis of the optical system based on the control of the lens controller 240, and detects the driving amount of the focus lens by the position detector 231. Thereby, the focus state of the subject image formed on the CCD image sensor 110 by the optical system can be changed. In the first embodiment, the focus motor 233 can be a DC motor. However, the present embodiment is not limited to this, and can be realized by a stepping motor, a servo motor, an ultrasonic motor, or the like.

  2 and 3 are flowcharts showing the flow of audio recording processing when recording is started by pressing the recording button 131 of the camera system 1 in the first embodiment.

  When recording is started, simultaneously recording of the signal obtained by amplifying and digitizing the audio signal from the microphone 180 by the amplifier 181 is started (S100).

  The camera controller 140 checks whether or not the subject distance has changed based on the signal captured by the CCD image sensor 110 (S101). Specifically, for example, when the photographed subject approaches the photographer, the subject distance is determined to change when the photographed subject changes significantly over time ("y"), If there is no change in the subject, it is determined that the subject distance does not change (“n”).

  When it is determined that there is a change in the subject distance, the camera controller 140 performs focusing control.

  Before performing the focusing control, the camera controller 140 reads out the focusing noise data of the interchangeable lens 200 attached to the camera body 100, which is stored in the flash memory 142 (S102).

  In the focusing control, the lens controller 240 is instructed to move the focus lens 230 via the body mount 150 and the lens mount 250 (S103). The lens controller 240 starts driving the focus motor 233 and controls the focus lens 230 in accordance with an instruction from the camera controller 140.

  During the focusing drive, the focus drive sound tends to be simultaneously recorded as the sound noise through the microphone 180 in the sound signal. Therefore, the camera controller performs signal processing for the anti-phase addition operation from the focusing noise data of the interchangeable lens 200 read from the flash memory 142 (S104).

  When the focus lens detects that the subject is in focus, the focusing process is terminated (S105).

  Since the driving sound noise of the focus lens disappears at the same time as the driving of the focus lens is finished, the audio signal noise removal process is also finished (S106).

  Next, the camera controller 140 checks whether or not there is a change in subject luminance based on a signal picked up by the CCD image sensor 110 (S107). Specifically, for example, when there is a large luminance change such that the subject appears in the shade from the shade, it is determined that the exposure cannot be adjusted by the gain setting of the image sensor (“y”). Alternatively, it is determined that there is no change in subject luminance, or exposure can be handled only by setting the gain of the image sensor (“n”).

  When there is a large luminance change in the subject luminance, the camera controller 140 performs aperture control. Before performing aperture control, the camera controller 140 reads aperture drive noise data of the interchangeable lens 200 attached to the camera body 100, which is stored in the flash memory 142 (S108).

  In the aperture control, an instruction is given to the lens controller 240 to move the aperture 220 via the body mount 150 and the lens mount 250 (S109). The lens controller 240 starts driving the aperture motor 221 and controls the aperture 220 in accordance with an instruction from the camera controller.

  During aperture driving, the aperture driving sound is simultaneously recorded as audio noise through the microphone 180 in the audio signal. Therefore, the camera controller performs signal processing of an anti-phase addition operation from the aperture driving noise data of the interchangeable lens 200 read from the flash memory 142 (S110).

  When the diaphragm 220 reaches a predetermined diaphragm value, the diaphragm driving process is terminated (S111). Since the diaphragm driving sound noise disappears at the same time as the diaphragm driving is completed, the audio signal noise removal process is also terminated (S112).

  The camera controller 140 determines whether or not to end the voice recording (S113). Specifically, the recording button 131 is pressed again to end the recording and at the same time the recording is determined to be ended ("y"). If the recording is continued, the recording is continued ("n"). If it is determined that the voice recording has ended, the camera controller 140 ends the recording and recording process (S114).

  FIG. 3 is a flowchart when the interchangeable lens 200 is attached to the camera body 100. When the interchangeable lens 200 is attached to the camera body 100, the camera controller 140 acquires a lens ID that allows the lens type to be determined from the lens controller 240 via the body mount 150 and the lens mount 250 (S200).

  The presence / absence of lens noise data stored in the flash memory 142 is determined based on the lens ID obtained from the interchangeable lens 200 (S201). If it is determined ("y") that the focusing noise and aperture drive noise of the attached interchangeable lens 200 are stored, the preparation for photographing is completed.

  When it is determined that there is no noise data of the interchangeable lens 200 attached to the camera body 100 (“n”), noise data is acquired. The camera controller 140 starts recording the signal obtained by amplifying and digitizing the audio signal from the microphone 180 on the DRAM 141 (S202). The camera controller 140 gives an instruction to drive the focus lens 230 for a predetermined time to the lens controller 240 via the body mount 150 and the lens mount 250 (S203). At the same time as the focusing drive is finished, the recording is finished (S204). The camera controller 140 generates focusing noise data from the recording data described above (S205) and stores it as focusing noise data in the flash memory 142 (S206).

  Similarly, the camera controller 140 again starts recording the signal obtained by amplifying and digitizing the audio signal from the microphone 180 on the DRAM 141 (S207). The camera controller 140 instructs the lens controller 240 to drive the diaphragm 220 through the body mount 150 and the lens mount 250 (S208). At the same time as the aperture driving is finished, the recording is finished (S209). The camera controller 140 generates aperture drive noise data from the recording data described above (S210), and stores it as aperture drive noise data in the flash memory 142 (S211).

  When all the noise data is stored in the flash memory 142, the lens mounting process is terminated, and preparation for photographing is made possible (S212).

  FIG. 4 is a diagram showing an example of a lens noise data storage map in the flash memory 142. For a lens that has been attached to the camera body 100, the lens ID, focusing noise data, and aperture noise data always have a pair of data, and can have noise data of a plurality of lenses.

  When the memory capacity is small, the time when the lens was last attached may be recorded, and the noise data recorded at the oldest time may be deleted.

  The present invention relates to an interchangeable lens having at least one actuator, a camera body to which the interchangeable lens is detachable, and an imaging device (specifically, a digital still camera, a movie camera) capable of recording sound with an interchangeable lens camera system. Etc.).

DESCRIPTION OF SYMBOLS 100 Camera body 110 Image pick-up element 131 Recording start / stop button 140 Camera controller 142 Flash memory 180 Microphone 200 Interchangeable lens 220 Aperture 230 Focus lens 240 Lens controller

Claims (2)

A microphone that converts audio into audio signals;
A discriminating means for discriminating the type of lens to be mounted;
Noise information storage means for storing a noise signal corresponding to a noise sound included in an audio signal obtained by the microphone in association with the type of the lens, and an operation command output means for outputting an operation command to the lens;
Selecting means for selecting a noise signal corresponding to a noise sound generated by the operation of the mounted lens from the noise signal stored in the noise information storing means;
Audio signal processing means for calculating a noise signal selected by the selection means to an audio signal obtained from the microphone to generate an audio signal with reduced noise;
An imaging apparatus comprising: When the lens is mounted, if the noise information corresponding to the noise sound generated by the operation of the mounted lens is not in the noise information storage unit, an operation command is issued to the operation command output unit, and the microphone The imaging apparatus according to claim 1, wherein the obtained operation sound of the lens is stored as a noise signal in the noise information storage unit.

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