JP2004193980A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a picture display device in which power of a display device can be turned off without waiting for lapse of prescribed time when a key operation of a camera is not performed. <P>SOLUTION: The display device is provided with an image pickup means for outputting an image signal, a display means for displaying a video of an object by the image signal outputted from the image pickup means, a movement detection means for detecting movement of the object by comparing difference data obtained by comparing a luminance signal of the present image signal outputted from the image pickup means with an image signal preceding by not less than one frame with a value which is previously set, and a control means for switching a standard mode whose update speed of the picture displayed on the display means is regular and a power saving display mode whose update speed is slower than regular speed in the middle of waiting for photographing. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device for photographing a subject and displaying a photographed image with a digital camera or a video camera having a liquid crystal monitor or the like as a finder.
[0002]
[Prior art]
In a digital still camera, a desired subject image is captured by a solid-state imaging device such as a CCD (Charge Coupled Device), and an image signal representing the image is converted into digital image data and recorded on a recording medium such as a memory card. I do.
[0003]
The recorded image data can be read arbitrarily, an image represented by the data can be displayed on a display device such as a CRT (Cathode Ray Tube), or can be printed by a predetermined printing device, or a personal computer. And perform predetermined processing.
[0004]
Conventionally, as such a digital still camera, a digital still camera including a display device such as a liquid crystal monitor that displays a video of a subject in a shooting standby state as a preview image is known.
[0005]
In this case, image frames of about 15 to 30 frames per second are sequentially captured from an image pickup device such as a CCD and a subject image represented by these images is displayed on a liquid crystal monitor. The photographer performs framing while looking at the liquid crystal monitor, and photographs in a desired photographing range and composition.
[0006]
In addition, in the shooting standby state, power consumption is increased in order to constantly display an image of a subject on the liquid crystal monitor. Therefore, conventionally, when a certain time, for example, 1 to 3 minutes, elapses when no button operation or menu operation of the camera is performed. Power saving has been achieved by automatically turning off the power of the camera device.
[0007]
[Problems to be solved by the invention]
However, the time until the power supply of the display device is automatically turned off is still a waste of power, and the problem that the operation time with a battery is short is still a major problem.
[0008]
The present invention solves such a problem of the conventional technology, and instead of waiting for the time to turn off the power of the display device, by actively detecting that the camera is not used by motion detection, An object of the present invention is to provide an image display device such as an electronic still camera that can further reduce the power consumed by a liquid crystal monitor and its peripheral circuits when displaying an image of a subject on the liquid crystal monitor during shooting standby. And
[0009]
[Means for Solving the Problems]
In order to solve the above problem, a digital still camera according to the present invention is configured such that a desired subject image is formed, and an imaging unit that outputs an image signal corresponding to an obtained image, and an image signal output from the imaging unit. A display unit for receiving the image signal of the subject represented by the image signal sequentially, and comparing a luminance signal of a current image signal output from the imaging unit with the image signal of one frame or more before. The motion detection means for detecting the motion of the subject or the camera device itself by comparing the obtained difference data with a preset value. A control unit for switching between a standard mode in which an update speed of an image displayed on the unit is a normal speed and a power saving display mode in which an update speed is lower than the normal speed.
[0010]
In this case, the image display device according to the present invention includes a method in which the motion detection means detects a motion by comparing consecutive frames, and a method in which a motion is detected by comparing a fixed frame before the current frame with a current frame. An image display device characterized by a motion detecting means for detecting a motion while switching.
[0011]
Further, the motion detecting means is a motion detecting means for detecting the motion by dividing the display unit into several blocks, and detecting at least one of the presence or absence or the amount of the motion for each of the blocks, and If no motion is detected, it is determined that there is no motion in either the subject or the camera device itself. If motion is detected in only some of the blocks, it is determined that there is a moving object in the subject, and all blocks are loaded. Is detected, it is determined that the camera device itself is moving, and a signal representing the determination result is output to the control unit. The image display device is characterized by that the image display device It is a still camera for taking a still image, or a video camera for taking a moving image of a desired subject, and the display means is a liquid crystal monitor combined with a viewfinder provided on the back of the camera body or the like. It is an image display device characterized.
[0012]
Further, when the motion detecting means determines that the subject or the camera device itself does not move, from the standard display mode in which the update speed of the image displayed on the display means is the normal speed, the image updating speed is lower than the normal setting. An image display device characterized by switching to a certain power saving display mode.
[0013]
An image display apparatus characterized by switching to a power saving display mode in which the power supply to the display means is stopped when the motion detection means determines that the subject or the camera device itself has not moved.
[0014]
Further, when the motion detecting means determines that the subject or the camera device itself does not move, the power supply to a functional block of a part of the camera device or the entire camera device is stopped.
[0015]
Further, when the motion detecting means determines that the subject or the camera device itself does not move, the image display apparatus switches to a power saving display mode in which the resolution of an image displayed on the display means is reduced.
[0016]
9. The image according to claim 5, further comprising a camera shake detecting unit, a camera posture detecting unit, an exposure correction button, a button for operating a zoom, and a manual focus button. In the display device, when the display mode of the image display device is the power saving display mode, camera shake, a change in the posture of the camera, the exposure correction button is pressed, the zoom is operated, and the manual focus button is pressed. When either of the above is detected, the update speed of the image displayed on the display means returns to the standard display mode, which is the normal speed.
[0017]
In addition, a photographer can set the display mode of the display device so as not to switch to the power saving mode in accordance with the result of the motion detection unit.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of the present embodiment.
[0019]
(Description of the whole block)
In FIG. 1, reference numeral 100 denotes an image processing apparatus.
Reference numeral 10 denotes a photographing lens, 12 denotes a shutter having an aperture function, 14 denotes an image sensor that converts an optical image into an electric signal, and 16 denotes an A / D converter that converts an analog signal output of the image sensor 14 into a digital signal.
[0020]
Reference numeral 18 denotes a timing generation circuit that supplies a clock signal and a control signal to the image sensor 14, the A / D converter 16, and the D / A converter 26, and is controlled by the memory control circuit 22 and the system control circuit 50.
[0021]
Reference numeral 500 denotes a motion detection circuit which receives a digital image signal from the A / D converter 16 and compares the current image signal with the luminance signal of the immediately preceding image signal to thereby determine the subject or the camera device itself. The motion is detected, and a signal indicating the presence / absence (or amount) of the motion is output to the image processing circuit 20 and the system control circuit.
The details of the motion detection circuit will be described later with reference to FIG.
[0022]
Reference numeral 20 denotes an image processing circuit which performs predetermined pixel interpolation processing and color conversion processing on data from the A / D converter 16 or data from the memory control circuit 22.
In the image processing circuit 20, predetermined operation processing is performed using the captured image data, and the system control circuit 50 executes the exposure control means 40 based on the obtained operation result and the detection result of the motion detection circuit 500. TTL (through-the-lens) type AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash pre-emission) processing for controlling the distance measurement control means 42.
[0023]
Further, the image processing circuit 20 performs predetermined arithmetic processing using the captured image data, and also performs TTL AWB (auto white balance) processing based on the obtained arithmetic result.
[0024]
A memory control circuit 22 controls the A / D converter 16, the timing generation circuit 18, the image processing circuit 20, the image display memory 24, the D / A converter 26, the memory 30, and the compression / decompression circuit 32.
[0025]
The data of the A / D converter 16 is written to the image display memory 24 or the memory 30 via the image processing circuit 20 and the memory control circuit 22, or the data of the A / D converter 16 is directly written via the memory control circuit 22. It is.
[0026]
Reference numeral 24 denotes an image display memory, 26 denotes a D / A converter, and 28 denotes an image display unit composed of a TFT / LCD, etc., and display image data written in the image display memory 24 passes through the D / A converter 26. Displayed by the image display unit 28.
[0027]
The electronic viewfinder function can be realized by sequentially displaying captured image data using the image display unit 28.
The image display unit 28 can arbitrarily turn on / off the display according to an instruction from the system control circuit 50. When the display is turned off, the power consumption of the image processing apparatus 100 is significantly reduced. I can do it.
[0028]
Further, the update speed of the image displayed on the image display unit 28 can be changed according to the presence or absence of the movement of the subject or the movement of the camera device itself, which is obtained from the movement detection circuit.
[0029]
Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a sufficient storage capacity for storing a predetermined number of still images and moving images for a predetermined time.
Accordingly, even in the case of continuous shooting or panoramic shooting in which a plurality of still images are continuously shot, it is possible to write a large amount of images to the memory 30 at high speed.
[0030]
The memory 30 can also be used as a work area of the system control circuit 50.
Reference numeral 32 denotes a compression / decompression circuit for compressing / decompressing image data by adaptive discrete cosine transform (ADCT) or the like. The compression / decompression circuit 32 reads an image stored in the memory 30 and performs compression or decompression processing. Write to.
[0031]
An exposure control unit 40 controls the shutter 12 having an aperture function, and also has a flash dimming function in cooperation with the flash 48.
42 is a distance measurement control unit that controls focusing of the photographing lens 10, 44 is a zoom control unit that controls zooming of the photographing lens 10, and 46 is a barrier control unit that controls the operation of the protection unit 102 that is a barrier.
[0032]
Reference numeral 48 denotes a flash, which also has a function of projecting AF auxiliary light and a function of flash light control. The exposure control means 40 and the distance measurement control means 42 are controlled using the TTL method, and the system control circuit 50 controls the exposure control means 40 and the distance measurement The control unit 42 is controlled.
[0033]
A system control circuit 50 controls the entire image processing apparatus 100, and a memory 52 stores constants, variables, programs, and the like for operation of the system control circuit 50.
Reference numeral 502 denotes a sensor for detecting camera shake. When camera shake is detected, the image processing circuit 50 performs image processing for correcting camera shake under a command from the system control circuit.
[0034]
Reference numeral 504 denotes a sensor for detecting a change in the posture of the camera. When the change in the posture of the camera is detected, the image processing circuit 50 performs image processing suitable for the posture of the camera under the instruction of the system control circuit.
The display unit 54 has a part of its functions installed in the optical viewfinder 104.
[0035]
Of the display contents of the display unit 54, those displayed on the LCD or the like include a single shot / continuous shooting display, a self-timer display, a compression ratio display, a recording pixel number display, a recording number display, a remaining number of images displayable, a shutter. Speed display, Aperture display, Exposure compensation display, Flash display, Red-eye reduction display, Macro shooting display, Buzzer setting display, Battery remaining battery display, Battery remaining display, Error display, Information display with multiple digits, Recording The display includes the state of attachment / detachment of the media 200 and 210, the communication I / F operation display, the date / time display, and the liquid crystal display mode.
[0036]
Also, among the display contents of the display unit 54, those displayed in the optical viewfinder 104 include an in-focus display, a camera shake warning display, a flash charge display, a shutter speed display, an aperture value display, an exposure correction display, and the like.
[0037]
Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory, for example, an EEPROM or the like.
Reference numerals 60, 62, 64, 66, 68, and 70 denote operation means for inputting various operation instructions of the system control circuit 50, such as a switch, a dial, a touch panel, pointing by gaze detection, a single voice recognition device, or the like. It is composed of multiple combinations.
[0038]
Here, these operation means will be specifically described.
Reference numeral 60 denotes a mode dial switch, which can switch and set various function modes such as a power-off mode, an automatic shooting mode, a shooting mode, a panoramic shooting mode, a playback mode, a multi-screen playback / erase mode, and a PC connection mode.
[0039]
Reference numeral 62 denotes a shutter switch SW1, which is turned on during operation of a shutter button (not shown) to perform AF (auto focus) processing, AE (auto exposure) processing, AWB (auto white balance) processing, EF (flash pre-flash) processing, and the like. Instruct operation start.
[0040]
Reference numeral 64 denotes a shutter switch SW2 which is turned on when the operation of a shutter button (not shown) is completed, and writes a signal read from the image sensor 12 into the memory 30 via the A / D converter 16 and the memory control circuit 22 in an exposure process. A development process using an operation in the image processing circuit 20 or the memory control circuit 22; a recording process in which image data is read from the memory 30, compressed by the compression / decompression circuit 32, and written into the recording medium 200 or 210. Instructs the start of a series of processing operations.
[0041]
An image display ON / OFF switch 66 can set ON / OFF of the image display unit 28.
With this function, it is possible to save power by cutting off the current supply to an image display unit composed of a TFT / LCD or the like when shooting with the optical viewfinder 104.
[0042]
When the image display ON / OFF switch 66 is pressed once, the power saving mode 1 is set, when the image display ON / OFF switch 66 is pressed once more, the power saving mode 2 is set, and when the image display ON / OFF switch 66 is pressed once more, the power saving mode 1 is invalidated. This is a switch that can invalidate the power mode 2 and deactivate the power saving modes 1 and 2 by pressing once.
[0043]
Reference numeral 68 denotes a quick review ON / OFF switch, which sets a quick review function for automatically playing back image data shot immediately after shooting.
Reference numeral 506 denotes a power saving display mode ON / OFF switch, which can forcibly invalidate a power saving display mode function that slows down the update speed of an image displayed on the image display unit.
[0044]
Reference numeral 508 denotes a manual focus button. By turning on this button, manual focus operation is enabled.
Reference numeral 510 denotes an exposure correction button. By turning on this button, the photographer can voluntarily perform exposure correction.
[0045]
Reference numeral 70 denotes an operation unit including various buttons, a touch panel, and the like. A menu button, a set button, a macro button, a multi-screen playback page break button, a flash setting button, a single-shot / continuous-shot / self-timer switching button, and a menu shift + (plus) Buttons, a menu move- (minus) button, a play image move + (plus) button, a play image- (minus) button, a shooting image quality selection button, a date / time setting button, and the like.
[0046]
Reference numeral 80 denotes a power control unit, which includes a battery detection circuit, a DC-DC converter, a switch circuit for switching a block to be energized, and the like. The DC-DC converter is controlled based on an instruction from the system control circuit 50, and a required voltage is supplied to each unit including a recording medium for a required period.
[0047]
Reference numeral 82 denotes a connector, 84 denotes a connector, and 86 denotes a power supply means including a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li battery, and an AC adapter.
[0048]
90 and 94 are interfaces with recording media such as memory cards and hard disks, 92 and 96 are connectors for connecting to recording media such as memory cards and hard disks, and 98 is a connector 92 and / or 96 to which a recording medium 200 or 210 is mounted. This is a recording medium attachment / detachment detecting means for detecting whether or not the recording medium is attached.
[0049]
Note that the present embodiment has been described as having two interfaces and connectors for attaching a recording medium. Of course, the interface and the connector for attaching the recording medium may have a single or plural number of systems. Further, a configuration may be employed in which interfaces and connectors of different standards are provided in combination.
[0050]
The interface and the connector may be configured using a standard such as a PCMCIA card or a CF (Compact Flash (R)) card.
[0051]
Furthermore, when the interfaces 90 and 94 and the connectors 92 and 96 are configured using a standard such as a PCMCIA card or a CF (Compact Flash (R)) card, a LAN card, a modem card, a USB card, an IEEE 1394 card By connecting various communication cards such as a P1284 card, a SCSI card, a communication card such as a PHS, and the like, image data and management information attached to the image data can be transferred to and from other peripheral devices such as a computer and a printer. Can fit.
[0052]
Reference numeral 102 denotes a protection unit that is a barrier that covers the imaging unit including the lens 10 of the image processing apparatus 100 to prevent the imaging unit from being stained or damaged.
Reference numeral 104 denotes an optical finder, which can perform photographing using only the optical finder without using the electronic finder function of the image display unit 28.
[0053]
In the optical viewfinder 104, some functions of the display unit 54, for example, an in-focus display, a camera shake warning display, a flash charge display, a shutter speed display, an aperture value display, an exposure correction display, and the like are provided.
[0054]
A communication unit 110 has various communication functions such as RS232C, USB, IEEE1394, P1284, SCSI, modem, LAN, and wireless communication.
Reference numeral 112 denotes a connector for connecting the image processing apparatus 100 to another device by the communication unit 110 or an antenna in the case of wireless communication.
[0055]
Reference numeral 200 denotes a recording medium such as a memory card or a hard disk.
The recording medium 200 includes a recording unit 202 including a semiconductor memory or a magnetic disk, an interface 204 with the image processing apparatus 100, and a connector 206 for connecting to the image processing apparatus 100.
[0056]
(Configuration and detection flow of motion detection circuit)
FIG. 2 is a configuration block diagram of the motion detection circuit 500. The image data output from the A / D converter 16 is applied to the comparison circuit 302 and is temporarily stored in the memory 301 having a memory capacity of one field (or one frame) (S301, S302).
[0057]
Further, when the image data of the next frame is fetched as the current image data (S303), the comparison circuit 302 compares the luminance signal of the image data of the previous field (or frame) stored in the memory 301 with the current image data. Then, the movement of the subject is detected based on the presence / absence (or amount) of the difference from the luminance signal (S304).
[0058]
When the difference value is smaller than the preset value, a signal indicating that "no motion is detected" is output to the system control circuit 50 (S305). Then, while the image data stored in the memory 301 is held in the memory 301, the comparison circuit 302 takes in the image data of the next frame again as the current image data (S303).
[0059]
When the difference value is larger than the preset value, a signal indicating that "motion has been detected" is output to the system control circuit 50 (S306). Then, the image data captured by the comparison circuit as the current image data is captured into the memory 301 as the image data of one frame before (S307).
[0060]
(Judgment method of motion detection circuit-1)
A difference between the luminance signal of the current image data and the luminance signal of the image data one frame before stored in the memory 301 is calculated for the corresponding pixel, and the absolute value of the difference value is added over the entire screen.
[0061]
If the addition result is 0 (zero) or equal to or less than a predetermined set value, “the camera device itself has been left untouched by the photographer” or “the moving object Does not exist ".
[0062]
If the result of the addition is equal to or greater than a predetermined reference value, it is determined that "a moving object exists in the screen" or "the camera apparatus itself has motion" and output to the system control circuit 50. .
[0063]
When the result of adding the difference values is an extremely small value, it is considered to be some fluctuation or noise. Therefore, the setting value for determining the presence / absence (or amount) of the movement has a value that takes these into consideration.
[0064]
(Judgment method of motion detection circuit-2)
The screen is divided into blocks, and a difference between the luminance signal of the current image data and the luminance signal of the image data one frame before stored in the memory 301 is calculated for the corresponding pixel, and the absolute value of the difference value is calculated. Add over the entire screen.
[0065]
If the addition result for each block is 0 (zero) or less than a predetermined set value, it is determined that "a moving object does not exist in the block", and the addition result for each block is determined in advance. If it is equal to or more than the reference value, it is determined that "a moving object exists in the block".
[0066]
Then, when it is determined that "there is no moving object" for all the blocks, then "the camera device itself has been left without being operated by the photographer, and there is no moving object in the subject." Judge.
[0067]
If at least one of the divided blocks is determined to be “there is no moving object”, then “the camera device itself is left without being operated by the photographer, There is a moving object in the subject. "
[0068]
If it is determined that all the blocks among the divided blocks are “there is no moving object”, then it is determined that “the camera device itself is being operated by the photographer”.
The result is output to the system control circuit.
[0069]
In the (judgment method of the motion detection circuit-1), if a change occurs in the image data, it is determined that the camera device is being operated by the photographer. Judgment method 2) is that even if a change occurs in the image data, "the camera device itself is operated by the photographer" or "the camera device itself is left without being operated by the photographer However, it is possible to increase the chances of shifting to the power saving display mode and improve the power saving effect by simply distinguishing and determining whether a moving object is present in the direction in which the camera is pointed. .
[0070]
(Switch display mode)
FIG. 5 is a flowchart for switching the display mode. If the power saving display mode has been disabled, the normal update mode in which the image update speed is the normal speed is set (S501).
[0071]
When it is determined by the above-described motion detection circuit that "the camera device itself has been left untouched by the photographer and no moving object exists in the subject," the update speed of the display image is determined. (S502).
[0072]
If it is determined that “the camera device itself is left without being operated by the photographer but a moving object is present in the subject”, the power saving display mode in which the update speed of the display image is slow is set ( S503).
When it is determined that “the camera device itself is being operated by the photographer”, the update speed of the display image is set to the normal normal image display mode (S504).
[0073]
Then, in the power saving display mode in which the update speed of the image signal displayed on the display means is lower than the normal speed, the motion detection circuit 500 determines that “the camera device itself is being operated by the photographer”. Then, when a signal indicating this is output to the system control circuit 50, when the camera shake detecting means 502 detects a camera shake (S506), and when the posture detection sensor 504 detects a change in the posture of the camera device ( S507), when a command for requesting exposure compensation is inputted by the exposure compensation operation button 510 or the like (S508), when a command for operating the zoom is inputted by the zoom button 44 (S509), and when the manual focus button 508 is inputted. When the manual focus command is input (S510), the system control circuit immediately increases the image update speed. To return to the standard display mode, which is a normally-speed.
[0074]
(Image display flow)
As described above, when one of the standard display mode and the power saving display mode is determined as the image display mode, the flow shown in FIG. 6 is performed at each update rate.
The system control circuit 50 sequentially reads the captured image data via the motion detection circuit into the image processing circuit 20 (S201). Using the sequentially read image data, the image processing circuit 20 performs predetermined TTL (through-the-lens) AE (auto exposure) processing, EF (flash pre-flash) processing, and AF (auto focus) processing. Is calculated.
[0075]
In each process, a specific portion of the total number of captured pixels, which is necessary, is cut out and extracted for a necessary portion, and is used for calculation. Thus, in each of the TTL-based AE, EF, AWB, and AF processes, it is possible to perform optimal calculations for different modes such as the center-weighted mode, the average mode, and the evaluation mode.
[0076]
Using the calculation result of the image processing circuit 20, the system control circuit 50 performs the AE control using the exposure control means 40 until the exposure (AE) is determined to be appropriate (S202) (S203).
[0077]
Using the measurement data obtained by the AE control, the system control circuit 50 determines whether or not a flash is necessary (S204), and if a flash is required, sets a flash flag and charges the flash 48 (S205).
[0078]
If it is determined that the exposure (AE) is appropriate (S202), the measurement data and / or setting parameters are stored in the internal memory of the system control circuit 50 or the memory 52. Using the calculation result of the image processing circuit 20 and the measurement data obtained by the AE control, the system control circuit 50 uses the image processing circuit 20 to determine the color balance until the white balance (AWB) is determined to be appropriate (S206). AWB control is performed by adjusting processing parameters (S207).
[0079]
If it is determined that the white balance (AWB) is appropriate (S206), the measurement data and / or the setting parameters are stored in the internal memory of the system control circuit 50 or the memory 52.
[0080]
Using the measurement data obtained by the AE control and the AWB control, the system control circuit 50 performs the AF control using the distance measurement control unit 42 until it is determined that the distance measurement (AF) is in focus (S208) (S208). S209).
[0081]
If it is determined that the distance measurement (AF) is in focus (S208), the measurement data and / or setting parameters are stored in the internal memory of the system control circuit 50 or the memory 52. The image data after the above processing is output as image data to be displayed on the image display unit 28.
[0082]
(Second embodiment)
In the present embodiment, a camera having a configuration similar to that of the first embodiment, in which power supply to the display device is stopped based on the detection result of the motion detection circuit.
[0083]
(Third embodiment)
In the present embodiment, a camera having the same configuration as that of the first embodiment, in which the supply of power to the entire camera device is stopped based on the detection result of the motion detection circuit.
[0084]
(Fourth embodiment)
In the motion detection circuit, the image is divided into several blocks, an operation for motion detection is performed for each block, and "whether the motion is of the subject" and "whether the motion of the camera device itself" are distinguished. A camera having the same configuration as that of the first embodiment that shifts to a power saving display mode upon detection of movement of the camera device itself.
[0085]
【The invention's effect】
As described in detail above, according to the image display device of the present invention, it is possible to determine that the camera has not been operated, which has been conventionally shifted to the power saving mode after a preset time has elapsed. Cameras such as AE (Auto Exposure), AWB (Auto White Balance), and AF (Auto Focus) that generate images for display by reducing the update rate of the images displayed on the display device at times. The number of times of processing that has given a large processing load to the signal processing circuit 203 will be drastically reduced, and the effect of reducing power consumption thereby will be enormous.
[0086]
Furthermore, since the camera power is not shut off unlike the conventional power saving mode, it is also a great advantage that the camera can be returned to the normal shooting mode in a short time.
[0087]
In addition, a further power saving effect can be obtained by stopping the supply of power to the display device or by stopping the supply of power to the entire camera device, instead of lowering the image update rate.
This is an invention that has excellent effects such as a reduction in power consumption and an increase in operating time on a battery.
[Brief description of the drawings]
FIG. 1 is a detailed block diagram for explaining an example of an embodiment of the present invention.
FIG. 2 is a block diagram of a motion detection circuit.
FIG. 3 is a flowchart of motion detection.
FIG. 4 is a schematic diagram of switching display modes.
FIG. 5 is a flow chart for switching display modes.
FIG. 6 is an image display flowchart according to the embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 photographing lens 12 shutter 14 image sensor 16 A / D converter 18 timing generation circuit 20 image processing circuit 22 memory control circuit 24 image display memory 26 D / A converter 28 image display unit 30 memory 32 image compression / decompression circuit 40 exposure Control means 42 Distance measurement control means 44 Zoom control means 46 Barrier control means 48 Flash 50 System control circuit 52 Memory 54 Display unit 56 Non-volatile memory 60 Mode dial switch 62 Shutter switch SW1
64 Shutter switch SW2
66 image display ON / OFF switch 68 quick review ON / OFF switch 70 operation unit 80 power control means 82 connector 84 connector 86 power supply means 90 interface 92 connector 94 interface 96 connector 98 recording medium detachment detection means 100 image processing apparatus 102 protection means 104 Optical viewfinder 110 Communication means 112 Connector (or antenna)
200 Recording medium 202 Recording unit 204 Interface 206 Connector 301 Memory 302 Comparison circuit 500 Motion detection circuit 502 Camera shake sensor 504 Attitude sensor 506 Power saving display ON / OFF switch 508 Manual focus ON / OFF switch 510 Exposure compensation button

Claims (10)

Imaging means for forming a desired subject image and outputting an image signal corresponding to the obtained image;
Display means for sequentially receiving image signals output from the imaging means, and displaying an image of a subject represented by the image signals;
By comparing difference data obtained by comparing a luminance signal of a current image signal output from the imaging unit with the image signal of one frame or more before, with a preset value, the object or the camera device A movement detecting means for detecting the movement of itself,
During standby for shooting, according to the result of the motion detection means, there are two modes, a standard mode in which the update speed of the image displayed on the display means is a normal speed, and a power saving display mode in which the update speed is a slower update speed than the normal speed. An image display device comprising: control means for switching between modes. The motion detecting means detects motion while switching between a method of detecting motion by comparing consecutive frames and a method of detecting motion by comparing a fixed frame before the current frame with a current frame. The image display device according to claim 1. The motion detecting means detects the motion by dividing the display unit into several blocks, detects at least one of the presence / absence or the amount of the motion for each block, and detects the motion only in some of the blocks. If it is determined that there is a moving object in the subject, and if motion is detected in all of the blocks, it is determined that the camera device itself has motion, and a signal representing the result of the determination is output. The image display device according to claim 1, wherein the image is output to a control unit. A still camera that captures a still image of the desired subject, or a video camera that captures a moving image of the desired subject, wherein the display means is used together with a finder provided on the back of the still camera or the main body of the video camera. The image display device according to claim 1, wherein the image display device is a liquid crystal monitor. When the motion detection unit determines that the subject or the camera device itself does not move, the image update speed of the image displayed on the display unit is changed from a standard display mode, which is a normal speed, to an image update speed lower than a normal setting. The image display apparatus according to claim 4, wherein the image display apparatus is switched to a power saving display mode. 5. The image according to claim 4, wherein when the motion detection unit determines that the subject or the camera device itself does not move, the mode is switched to a power saving display mode in which power supply to the display unit is stopped. 6. Display device. 5. The power supply to a part of functional blocks of the camera device or the entire camera device when the motion detecting means determines that the subject or the camera device itself does not move. 3. The image display device according to 1. 5. The power saving display mode according to claim 4, wherein when the motion detecting means determines that there is no movement of the subject or the camera device itself, the mode is switched to a power saving display mode for lowering a resolution of an image displayed on the display means. Image display device. Camera shake detection means, camera posture detection means, an exposure compensation button, a button for operating a zoom, and a manual focus button,
When the display mode of the image display unit is the power saving display mode, camera shake, a change in the posture of the camera, or an exposure correction button has been pressed, a zoom operation has been performed, or the manual focus button has been pressed. 9. The method according to claim 5, wherein when any one of the above is detected, the update speed of the image displayed on the display unit returns to the normal display mode, which is a normal speed. 10. Image display device. 2. The image display apparatus according to claim 1, wherein a photographer can set a display mode of the display unit so as not to switch to a power saving mode in accordance with a result of the motion detection unit.

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