JPS63129328A - Image pickup device - Google Patents

Abstract

PURPOSE:To confirm a hand shake by displaying as a hand shake quantity the accumulating total of differences between image information which is obtained by continuous image pickup operation and image information obtained from the picked-up image information at specific intervals. CONSTITUTION:Object images are converted by a photoelectric converting means 3 photoelectrically in order and an arithmetic means 9 calculates difference information between plural pieces of a 2nd image information obtained from the photoelectric converting means 3 after 1st image information and the 1st image information stored in a 1st storage means 8. Then, an adding means 10 totalizes at least two pieces of difference information, i.e. pieces of difference information calculated by the arithmetic means 9 and 2nd difference information stored in a 2nd storage means 11 after the 1st difference information and the total data is outputted to and displayed on a display means 13 as the hand shake quantity through a signal line l9 and a switching means 12. Consequently, the hand shake quantity can be confirmed visually.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an imaging device such as a camera or a still camera.
In particular, the present invention relates to an imaging device capable of displaying camera shake in a photographed image.

[Prior Art] Generally, cameras with electronic viewfinders are being considered, but conventional cameras of this type cannot detect camera shake that affects shooting, and are difficult to use when shooting moving subjects. However, when a photographer senses camera shake, there is a problem in that the photographer has to photograph the same subject more than once in case the photographer fails to take a picture due to camera shake.

[Problems to be Solved by the Invention] Therefore, the purpose of the present invention is to solve such problems,
To provide an imaging device capable of displaying a warning that the shutter is being opened and also being able to know the amount of camera shake equivalent to actual film photography during photography.

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a photoelectric conversion means for sequentially photoelectrically converting a subject image, and a first image information photoelectrically converted by the photoelectric conversion means. Difference information between the first image information stored in the first storage means, a plurality of second image information obtained from the photoelectric conversion means after the first image information, and the first image information stored in the first storage means. a second storage means for storing the first difference information calculated by the calculation means, a plurality of difference information calculated by the calculation means, and a second storage means for storing the first difference information calculated by the calculation means, Second
An imaging device comprising: a neutralization means for calculating at least two of the second differential information stored in the storage means.

[Function] The present invention accumulates the differences in image information obtained from image information captured continuously and image information captured at predetermined intervals, and displays this cumulative information as the amount of camera shake. It is possible to confirm that a touch has occurred, and also to total the cumulative information for each pixel, and to issue a warning when the total value is greater than a reference value.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows an example of the appearance of the embodiment of the present invention.

In FIG. 2, 51 is the main body, and 52 is the CC, which will be described later.
I) This is an optical system that forms one optical path. 53 is a film surface, and 54 is an optical system that forms an optical path to the film surface 53. 55 is a shutter release button, which is linked to a switch 5.6 which will be described later.

FIG. 1 shows an example of a configuration in an embodiment of the present invention.

In FIG. 1, 1 is a light receiving element, and a solid-state image sensor (CCO) is used for an electronic viewfinder. 2 is a CCD driver that drives the CCDI. 3 is an A/D conversion means for converting the image signal from the CGDI from an analog electrical signal to a digital electrical signal.

4 is a timing generation circuit that controls the drive timing of each device according to the present invention. 5 is a switch that operates in conjunction with the release button 55 shown in FIG. 2, and the switch 5 is turned "on 1" on the first stroke. 6 is a switch that is operated in conjunction with the release button 55 shown in FIG. This switch is turned on in the second stroke state, and when the photographer turns on switch 6, the film 5
Start the exposure to 3.

7 is a third storage means for temporarily storing the output of the A/I converter 3. 8 is a first storage means that receives the transfer of data stored in the third storage means and stores this data, and the data stored in the first storage means and A/
The outputs from D converter 3 are compared.

9 is a calculation means, and the calculation means 9 calculates the difference (luminance difference) between the data of the first storage means 8 and the output of the A/D conversion means 3, and outputs the absolute value of the difference to the addition means 10. . The addition means lO adds the data stored in the second storage means 11 and the output data of the calculation means 9, and rewrites the data in the second storage means 11 with the addition result as cumulative difference data.

12 is the output from the second storage means 11 and the A/D converter 3
This is a switching means for outputting one of the outputs from the . 13
1 is a display means for displaying the output data from the switching means 12, and 14 is a driver for controlling the display of the display means 13. Reference numeral 15 denotes an exposure control means for controlling the exposure of the film surface 53.

Next, the operation of the embodiment of the present invention will be explained with reference to the timing chart of FIG. The present invention focuses on changes in the imaging position in the subject image caused by camera shake, that is, (:CD
The total sum of the differences between the two screen outputs sequentially captured by I is displayed on the display means 13 as the camera shake base.

In FIG. 3, when switch 5 is turned on, it generates pulses of waveform A until the operator turns switch 5 "off." Also, each circuit is powered on and the CCD
The photographed image photoelectrically converted by 1 is converted from an analog signal to a digital signal by A/D conversion means 3,
Signal line f! , 3. Displayed on the display means 13 through the switching means 12.

The CCDI outputs one screen of image signals during the occurrence of one pulse as shown in the CCD output waveform of FIG. In addition (:C
The output timing of D1 is controlled by the COD driver means 2 in accordance with the timing pulse of the timing generation circuit 4. Further, the display means 113 similarly displays the driver 14 according to the timing pulse of the timing generation circuit 4.
controlled by

Next, when the operator turns on the switch 6 at timing B, the switching means 12 selects the output of the second storage means 11 and outputs it to the display means 13. At this time, no memory data is stored in the second storage means 11 and nothing is displayed.

Then, when switch 6 is turned on, the first CGD
One screen worth of image information (frame) photoelectrically converted with the output pulse F-1 from I is stored in the third storage means 7,
The frame is immediately transferred to the first storage means 8.

The frame output from the CCDI with the next pulse F2 is stored in the third storage means 7. The calculation means 9 calculates the luminance difference between the frame stored in the first storage means 8 and the frame output by the CGDI with the pulse F3, and outputs the difference to the addition means IO.

Thereafter, the output of GCDI is sequentially sent f3 to the calculation means 9 via the third storage means 7 and the first storage means 8, and the calculation means 9 inputs the data stored in the first storage means and A/ Subtraction with the output data from the D converter 3 is repeated. This subtraction is repeated during the phase of pulse generation, that is, the timing when the shutter is open, as indicated by the timing D determined by the exposure control means 15.

The data output from the calculating means 9 is accumulated to the previous data by the adding means 1O. The stored data is transferred from the second storage means 11 that stores this cumulative data to the signal line 19.
．． The signal is outputted to the display means 13 through the switching means 12.

4(A) and 4(B) schematically show images actually displayed on the display means 13.

FIG. 4 shows an example of the display on the display means 13.

In FIG. 4, area 41 shows an image displayed in real time from when switch 5 is turned on until when switch 6 is turned on. Furthermore, when the switch 6 is turned on, the entire displayed image temporarily disappears from the display screen, and when the camera moves due to camera shake, the blurred image, that is, the difference in brightness at the same image position, is displayed as area 42 or area 43. be done.

As the amount of hand-held shots increases, areas with strong hand-shake effects will be displayed in a darker manner on the display means 13, such as area 43.

Therefore, the photographer can use the display means to confirm that the image is close to the image taken with the camera shaken. In addition, the photographer will be able to decide whether or not to take another photo by taking into consideration the size of the darkly displayed area and the effects of camera shake on the photo that was just taken. . This eliminates the need to photograph the same subject twice each time.

FIG. 5 shows an example of a detailed circuit configuration of the main components in the embodiment of the present invention.

In Figure 5, the clock (synchronization signal) is at counter 8.
1, 83, and 85, and the same address is inputted to the RAM 82 in the third storage means 7 with a phase shift.
, RAM84 in the first storage means 8, and RAM8[i in the second storage means 9]. When exposure is started, that is, when the switch 6 is turned on, the output of the first imaged screen from the CCDI is sent to the RAM via the pass buffer 87.
82 and then sent to RAM 84 through path buffer 88.

When the next screen is sent from CGDI via A/D converter 3, RAM 82 writes this data and at the same time R
The stored data is outputted from AM84 to calculation means 9. Further, the calculation means 9 calculates the difference between both data and outputs the absolute value to the adder 10. The adder lO adds the data output from the RAM 86 corresponding to the image position and the output of the calculation means 9, and outputs it to the pass buffer 89, and also outputs the data to the RAM 86 corresponding to the image position.
The corresponding data of 86 is rewritten with the added data.

Note that the adder IO may be set to output the maximum value of data that can be held in the second storage means in consideration of a case where the calculated value overflows.

The switching means 12 switches between the path buffers 92 . Pass buffer 93.
When the inverter 94 outputs the output of the A/D conversion means 3 to the display means 13, the signal line 13 and the signal line! +7 is connected, and when outputting the output from the second storage means 9 to the display means 13, the signal line IL9 and the signal line j2+7 are connected.

FIG. 6 shows an example of the circuit configuration of the timing generation circuit 4 in the embodiment of the present invention.

In FIG. 6, a clock is generated from a clock generation circuit 204, and the up-counted output of the counter 202 becomes the address of the ROM 201, and RO! 1t
The data written in 201 is outputted from m data line bits 00 to 0n-1 every clock.

Therefore, by writing the timing of the timing signal sent from the data line bit to each device in the ROM 201, the CCD driver 2. It becomes possible to send a timing signal to the switching means 91 and the display driver 11.

Here, the upper bit of the address, An-2, contains the output of the latch means 203 that latches the "on" state of the switch 6, so the address of ROM10I is A-o~
It will be repeated between An-3.

Now when switch 6 is turned on, the address is decoder 20
5, the AND gate 206 detects that the switch 6 is "on" at the correct timing.
It is latched by the latch means 203. At the same time, exposure control is started and address A is set at the same time. Addresses 80 to An-3 are repeated until the exposure completion signal is input to -1. As a result, the output will be taken out from the CCDI at a new timing. When the exposure completion signal is input to the address An-1, the address advances and a timing signal is output to the ROM 201 to move on to the subsequent operation. In this embodiment, the ROM 201 is used for timing generation, but a latch circuit and a counter are provided to generate timing pulses according to each device. may also be created.

FIG. 7 shows the circuit configuration of the exposure control means 15 in the embodiment of the present invention.

In FIG. 7, 351 is an SPC which is a light receiving element for photometry, and the photocurrent generated at 5PII:351 is converted into a compressed voltage by an operational amplifier 352 and a diode 353 for logarithmic compression. photocurrent l5p
If c, then the output of the operational amplifier 352 is output.

Here, TVc is a reference voltage source, k is a Boltzmann constant, T is an absolute temperature, q is an electron charge, and io is a reverse saturation current of the diode 353.

The output voltage of the operational amplifier is applied to the base of the expansion transistor 355. When the collector current is Ic, the following equation holds true.

and (2) can be written as follows.

Therefore, ■c=TVc' X 11pe(4) As shown above, T
The photocurrent multiplied by Vc' flows into the collector of transistor 365.

When exposure is started, the switch 356 is turned off, and the time-fixing capacitor 354 is photoelectronized by the collector current of the transistor 355. Note that Vcc is the power supply of the circuit.

This voltage is determined by a comparator 358 as a reference voltage 357.
The output of the comparator 358 changes from a high level to a low level when the voltage becomes more than the reference voltage. The AND gate 359 outputs a high level from the timing of starting exposure until the output of the comparator 358 becomes low level, controls the transistor 361 via the resistor 360, and energizes the coil 362.

This coil 362 controls a shutter (not shown) to obtain proper exposure.

FIG. 8 shows an example of the configuration of a second embodiment of the present invention. In this embodiment, the timing generation circuit 4. Calculating means 9. Addition means 10. This is an example in which a microcomputer is used as the switching means 12.

Note that the same parts as in FIG. 1 are given the same reference numerals.

In FIG. 8, 301 is a microcomputer (MP
tl), and the MPt 1301 executes control related to photographing in addition to the control procedure according to the embodiment of the present invention shown in FIG. MP0301 is a processing unit (CPIJ) '30
1-1. Read only memory (ROM) 301-2
, random access memory (RAM) 301-3 to 30
1-5 and digital-to-analog converter (A/D converter)
301-6.

The ROM 301-2 stores the control procedure shown in FIG.

The RAMs 301-3 and 301-4301-5 store variables used in this control procedure and image data captured by CGDI. The A/D converter 301-6 converts an input analog signal such as captured image data into a digital signal and outputs the digital signal to the CPU 301-1. 302 is a system bus that transmits information from each device shown in FIG.

FIGS. 9(A) and 9(CB) show an example of the control procedure of the MPti 301 in the second embodiment of the present invention.

In FIG. 9 (8), when the power of the camera body is turned on, the CPU 1301-1 loads the RAMs 301-3 to 301-3.
1-5 and initial values of each component are performed (step Sl).

Next, when the photographer turns on switch 5, MPt13
01 drives CCDI and A/D converted CGDI
The output image data is taken into the CPU 301-1, this image data is output to the display means 13, and the display driver 14 is driven to display the photographed image data on the display means (steps 52 to S6). This processing procedure (steps S2 to S8) is continued until the photographer turns on the switch 6.

When the photographer turns on switch 6, MPIII
sends an exposure start signal to the exposure control signal 15. When the exposure control means 15 receives this exposure start signal, it operates the shutter drive means 16 based on a preset exposure time (step S9). Shooting will start from this point.

Next, the MPU 301 allows an interruption of the exposure completion signal from the exposure control means 15. Note that when the MPt 1301 receives an exposure end signal from the exposure control means 15, it executes the control procedure shown in FIG. 9(B), ends the exposure control, and prohibits signal interruption from the exposure control means 15.

In steps Sll and 512, the MPU 301 takes in the output image from the CGDI and writes this image data into the RAM 301-3 as the first storage means 8 shown in FIG. 1 (step 514).

CPt1301-1 stores one screen worth of image data in RAM3.
01-34: After writing, the CGDI is driven again to MP the image data for the next display screen after a predetermined screen interval.
U301, temporarily store it in the register in CPt1301-1, and store this image data and RAM301-
Steps 516 to 5 calculate the difference between the image data corresponding to the image position stored in step 3, ie, the camera shake scene.
20).

Next, the calculated result is added to the data stored in the RAM 301-4 as the second storage means 11 shown in FIG. 1, and the added result is written into the RAM 301-4 again (steps 521 to 522).

Next, the image data stored in the register of the CPU 301-1 mentioned above is written to the RAM 301-3, and the RAM 30
The display means 13 displays the cumulative difference data stored in 1-4.
(Steps S24 to 525).

The above-described procedure is repeated until the display of the cumulative difference data for one screen is completed (steps 518 to 526).

In this embodiment, it is determined that shooting is to be continued until the photographer turns off the switch 6, and the above-mentioned cumulative difference data, that is, camera shake distortion is displayed.However, camera shake is displayed based on the exposure completion signal. It may be configured to end.

When the switch 6 is turned off, the cumulative difference information stored in the RAM 301-4 until the switch 5 is turned off is displayed on the display means 13 (steps 528 to 530).

Note that steps 52 to S7 may be repeated to repeat the subject images. When the switch S5 is turned off, it is determined that 18 m3 of one photo has been completed, and this control procedure is ended. Thereafter, by executing the above-mentioned control procedure every time a photograph is taken, the photographer can display the amount of camera shake on the display means 13.
You can know by looking at.

FIG. 1θ shows the configuration of an example in which a warning means is added to the present invention.

In FIG. 10, reference numeral 62 is a determination means using a comparator, which calculates the total amount of camera shake (difference cumulative data) stored in the second storage means 11 shown in FIG. Compare the meter data with predetermined warning reference values. Reference numeral 63 denotes a warning means for receiving a detection signal from the determining means 62 and emitting, for example, an alarm sound when the total data exceeds the warning reference value. Note that if the discrimination means 62 manually outputs a detection signal when the total data is smaller than the reference value, the warning means can be used as a warning to permit photographing.

In addition, in the uninvented first embodiment, the CCD for each screen
When outputting I, image data on even-numbered screens is
The third storage means 7 can be omitted by directly storing the image data from the /D converter 3 in the second storage means to obtain image data for odd-numbered screens. Furthermore, a dual port RAM may be used as the storage means.

[Effects of the Invention] As explained above, according to the present invention, it is possible to equivalently display the amount of camera shake in the case of complex camera shake on the actual film surface, so that the amount of camera shake can be visually confirmed and the shutter can be opened. Since you can also check that the shutter speed is set at a long shutter speed, if camera shake is severe, you can stop shooting midway. Furthermore, if it is determined that the camera shake is large, it is possible to immediately retake the image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a configuration in an embodiment of the present invention, FIG. 2 is a perspective view showing the external appearance of an embodiment of the present invention, and FIG. 3 is a timing chart showing operation timing in an embodiment of the present invention. FIG. 4 is an explanatory diagram showing a display example in the embodiment of the present invention. FIG. 5 is a block diagram showing an example of a detailed configuration of the main components in the embodiment of the present invention. FIG. 6 is a timing generation diagram in the embodiment of the present invention. FIG. 7 is a block diagram showing an example of the circuit configuration of the circuit 4, FIG. 7 is a circuit diagram showing an example of the configuration of the exposure control means 15 in the embodiment of the present invention, and FIG. 8 is a block diagram showing an example of the configuration of the second embodiment of the invention. 9(8) and (B) are flowcharts showing an example of the control procedure of the MPU3Q1 in the uninvented second embodiment, and FIG. 10 is the uninvented first embodiment and the second embodiment. FIG. 2 is a block diagram showing an example of a configuration in which a warning function is added to the system. 1...CCO. 2... Driver, 4... Timing generating circuit, 7.8.11... Storage means, 9... Arithmetic means, 10... Adding means, 12... Switching means, 13... Display means, 15... Exposure control means. A <A large J -Pa ≧ ≧ ≧ 扁 扁 扁 扁 扁 少 少 ''''''''''''''''' jl, @Figure 2,? - Chain Shizuki) Guumine 3 Idashunme Unagi Zenin I row showing Yuki mouth moon tile] Fig. 4 Honpo 5 wholesale and lack of power package) Su J K f,, - + Stone 1 [Chi ) No. 6. Figure 1 θ Figure 1 Theta showing the color of the hair. Person - Relationship to the case Patent applicant (100) Canon Co., Ltd. 4, Agent address: 3rd floor, Seiko Building 6, 5-1-31 Akasaka, Minato-ku, Tokyo 107 Telephone: (03) 589-1201 (Representative) 6
, Drawing 7 to be amended, Contents of amendment
A) Part 1" and "Fig. 9 (A) Part 2" are corrected.

Claims (1)

[Scope of Claims] 1) Photoelectric conversion means for sequentially photoelectrically converting subject images; first storage means for storing first image information photoelectrically converted by the photoelectric conversion means; and the first image. calculation means for calculating the difference information between the plurality of second image information subsequently obtained from the photoelectric conversion means and the first image information stored in the first storage means, based on the information; a second storage means for storing first difference information calculated by the calculation means; a plurality of difference information calculated by the calculation means; and a second storage means for storing a plurality of pieces of difference information calculated by the calculation means; An imaging device comprising: means for integrating at least two pieces of stored second difference information. 2) photoelectric conversion means for sequentially photoelectrically converting a subject image; analog-digital conversion means for converting image information photoelectrically converted by the photoelectric conversion means into image information of a digital signal; a first storage means for storing converted first image information; and second image information that has been analog-to-digital converted by the analog-to-digital conversion means after the first image information and the first storage. a calculation means for calculating the difference between the first image information stored in the means; a second storage means for storing the first difference information calculated by the calculation means; and a second storage means for storing the first difference information calculated by the calculation means. Adding means for adding first difference information and second difference information stored in the second storage means before the first difference information; and adding the added result to the second storage means. writing means for updating and storing the second difference information stored in the means; summing means for totaling the second difference information stored in the second storage means; comparing means for comparing the difference information with a predetermined value; and means for generating a warning when the total third difference information is determined to be larger than the predetermined value as a result of the comparison by the comparison means. An imaging device comprising: