JPH0530412A - Electronic still camera system capable of displaying dimension - Google Patents

Abstract

PURPOSE:To display dimension with high accuracy to an object photographed as a small size around the center of a screen by making magnification in a screen for size measurement larger than that of a photographing screen so as to acquire each information and to make calculation in an electronic still camera system in which a size between two measurement points and a scale indicating the range are displayed simultaneously with an object. CONSTITUTION:When the dimension indication is set while a zoom magnification is increased as larger as possible and two measuring points are designated, a CPU 14 fetches information representing the position, distance information and zoom information to calculate a scale data representing the size and the range. When the zoom magnification is decreased to form a photographing screen with a smaller magnification than that of the size measurement pattern, the decreased magnification is multiplied with the data to calculate the data of the scale representing the size and the range in matching with the photographing screen. The object and the dimension with high accuracy or the like are simultaneously displayed on an electronic view finder or the reproducing screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to measure the dimension between any two points of an object to be measured captured in the field of view of a viewfinder and the scale (hereinafter referred to as "scale") between them in the viewfinder. Medium) and electronic still camera system that can display the captured image on the playback screen at the same time,
More specifically, the present invention relates to an electronic still camera system in which information for size calculation is acquired from a size measurement screen having a magnification different from that of a shooting screen in order to improve the calculation accuracy of the size displayed together with a subject image.

[0002]

2. Description of the Related Art The applicant of the present invention is able to add a scale and its length to an image of a subject in order to easily and accurately know the distance between any two points on an object to be measured. Is proposed. This proposal is to insert a scale and a dimension indicating the section between two points of the object to be measured on the viewfinder or the reproduction screen. The distance information to each subject is obtained by the AF operation, and the dimension between two points is calculated based on the distance information and the like.

[0003]

The information for the dimension calculation in the above proposal specifies two measured points on the photographing screen, and the lens position information (distance information) of the focus adjustment lens at the time of focusing on that screen. ) And zoom position information obtained from the zoom lens. Therefore, when the magnification of the photographic screen is small and the distance between the measurement points on the screen is very small, the accuracy of the calculated dimensions is reduced. When it is desired to display the size of a subject that must be small in the center of the screen without increasing the shooting magnification, the proposed size display system was not sufficient in terms of accuracy.
An object of the present invention is to solve the above-mentioned problem, and by obtaining the information by calculating the magnification of the dimension measurement screen larger than that of the photographing screen, the accuracy is good even for a small photographed subject near the center of the screen. An object of the present invention is to provide an electronic still camera system capable of displaying various dimensions and a scale indicating the section.

[0004]

In order to achieve the above-mentioned object, an electronic still camera system capable of displaying dimensions according to the present invention has position information of two measured points of an object captured in the same field of view and focusing of the positions. The zoom information and the distance information at the time are obtained, and the information of the scale between the two measurement points and the scale indicating the section is calculated by substituting the information into a predetermined arithmetic expression to perform calculation. When data is sent to the scale pattern generator to output the numerical value, unit, and scale pattern indicating the dimension, and when the screen that is being shot or shot is reproduced, the numerical value, unit, and scale pattern indicating the dimension is displayed on the subject screen. An electronic still camera system capable of displaying at the same time, in the condition that the size display mode is set, When the two measured points are designated, the size and scale data are calculated based on the position information acquired for each measurement point and the zoom information and distance information at the time of focusing, and then the photographing magnification is changed. In this case, the size and scale data is multiplied by the ratio of the changed shooting magnification, and a control means for recalculating the size and scale to match the shooting magnification at that time is provided. The size of the dimension measurement screen is increased to obtain zoom information, distance information and position information when focusing.

[0005]

According to the above construction, it is possible to display a dimension with improved accuracy and a scale showing its section.

[0006]

The present invention will be described in more detail with reference to the drawings. Figure 1 shows the distance (dimension) between two DUTs.
It is a figure for demonstrating the principle of calculation. A state in which two DUTs 53 and 54 are captured within the field of view of the finder is shown. Considering that the object 53 to be measured is present at a coordinate position Q on a plane perpendicular to a straight line passing through substantially the center of the lens system, the center of the other object to be measured 54 is substantially the same as the center of the plane, and It is considered to exist at the coordinate position P of another plane parallel to the plane. Therefore, the coordinate positions Q and P are imaged at corresponding positions on the CCD image pickup device surface, and the coordinate positions Q and P can be detected on the CCD image pickup device surface. When the AF distance measuring frame is moved and brought onto the object to be measured 53, the object to be measured 53 is focused, and the distance information Lq to the object to be measured 53 is obtained from the information of the focus adjustment lens position at that time. Obtainable. The position Q on the screen where the object to be measured is present can be obtained from the position of the distance measuring frame. The AF distance measuring frame can be moved by controlling the gate circuit that drives the CCD. The distance information Lp is similarly applied to the DUT 54.
And the position information P on the screen can be obtained. Here, the distance (dimension) between the coordinate positions PQ is L, and the distance from the CCD image pickup device 50 to the coordinate positions P and Q is 1 ₂ respectively.
And 1 ₁ and the angles formed by the coordinate positions P and Q with respect to the optical axis are θ ₂ and θ ₁ , L is expressed by the following equation. L = {(1 ₁ sinθ ₁ +1 ₂ sinθ ₂ ) ² + (1 ₂ cosθ ₂ -1 ₁ cosθ ₁ ) ² } ^1/2 (1)

FIG. 2A is a diagram showing an example of a photographing screen of an electronic viewfinder or a monitor displaying a scale and its length numerical value and unit between two measured points.
The picture was taken so that the subject is relatively small in the center.
The distance between the two measurement points P and Q is very narrow. Each piece of information for calculating the dimensions is acquired from the screen as shown in FIG. 2B in which the size of the dotted line frame is enlarged from the shooting screen.

FIG. 3 is a circuit diagram showing an embodiment of the electronic still camera system according to the present invention. The image pickup system means 4 comprises a lens system 1, a diaphragm 2 and a CCD image pickup device 3. The lens system 1 is composed of a master lens, a focus adjustment lens, a variable power lens (zoom lens) and the like, and a diaphragm 2 is incorporated in the rear part thereof. The iris including the focus control means, the autofocus control circuit 18 is configured to include a drive unit for driving the focus adjustment lens and the variable power lens of the lens system 1, a drive unit for driving the diaphragm, and a control unit for controlling these. ing. The iris / autofocus control circuit 18 controls driving by a control signal sent from the CPU 14 including a control means.

The CPU 14 is the shutter control circuit 1
When the CCD driver 17 is activated via 6 to drive the CCD image pickup device 3, the subject image is taken into the circuit of the recording system through the image pickup system means and displayed on an electronic viewfinder (not shown). In addition to the above operation, the iris / autofocus control circuit 18 drives the focusing lens based on the high frequency signal extracted from the video signal to perform the focusing operation. Information (distance information) indicating the focus adjustment lens position and focus adjustment lens position is sent to the CPU 14. When a zoom operation is performed and a zoom signal is input from the CPU 14, the variable power lens is driven to enlarge or reduce the subject to a desired size. In addition to this, the iris and auto-focus control circuit 18 receives information on the brightness from the video signal and drives and controls the diaphragm 2 so that the subject is properly exposed. The dimension display mode switch 38 is for setting the camera to the dimension measurement display mode.

When the CPU 14 receives the release operation signal, it sends a control signal to the CCD driver and the CCD image pickup device 3
Then, the charge accumulated until then is discharged to start the transfer, and the transfer is ended after a predetermined time (shutter time) has elapsed. The CCD image pickup device 3 sends an electric signal of a subject image to a recording system circuit. In the recording circuit, the CCD image sensor 3
Is inputted to the color matrix circuit 5 and the Y process circuit 9. The color matrix circuit 5 subtracts the Y (luminance) signal and the chroma signal and outputs a color difference signal. On the other hand, the Y process circuit 9 uses the timing pulse from the timing generator 21 to insert a synchronizing signal or the like to create a predetermined luminance signal. A part of the output of the Y process circuit 9 is sent to the contrast detection unit 20. The contrast detection unit 20 detects the brightness of the luminance signal at the timing of the pulse supplied from the timing generator 21, and sends the detection information to the CPU 14. The CPU 14 analyzes the detection information and sends a control signal to the iris / autofocus control circuit 18 for the above-mentioned exposure control.

The character and size insert circuit 6 is a circuit for inserting the specified color information from the character and size pattern generator 19 in order to make the size and scale the specified color. Also, the character and size insert circuit 10
Is a circuit for inserting a scale signal (a numerical value indicating a distance (dimension) between two measured points, a unit and a scale pattern signal) into the luminance signal. These character and size insert circuits 6 and 10 operate only when a scale signal is sent from the character and size pattern generator 19, and the color matrix circuit 5 and the Y process circuit 9 form a color difference signal and luminance which form an image of a subject. When signals are supplied, scale signals are not inserted in those signals. Therefore, the character and size insert circuits 6 and 10 output the image signal of the subject and the image signal into which only the scale signal is inserted at different timings.

The color difference signal and the luminance signal which have passed through the scale insert circuits 6 and 10 are sent to a recording processing circuit 7 which is composed of an emphasis circuit, a modulator and a synthesizer. The recording processing circuit 7 performs emphasis processing on the color difference signal and the luminance signal, FM-modulates them, and then synthesizes them. The combined signal is recorded on a predetermined track of the video floppy 24 by the magnetic head 25. Here, when the scale signal is also taken in, the video signal of only the scale signal is set and recorded on the even-numbered tracks, and the video signal of the subject is set and recorded on the odd-numbered tracks. Information in which the track number of the image of the subject and the track number of the image of only the scale signal are associated with each other is stored in the memory built in the CPU 14.

The VFD (Video Floppy Driver) interface circuit 22 is controlled by the CPU 14 so that the VFD 2
The drive control of the spindle motor in 3 is performed, and the video floppy 24 is rotated at a predetermined speed and phase. Further, the head driving motor is driven to drive the magnetic head 25.
Is moved to the track of the video floppy 24 designated by the CPU 14. An LCD 15 is connected to the CPU 14 and various displays showing the state of the electronic still camera are performed.

The circuit portion on the right side of the alternate long and short dash line is a portion showing a reproducing system. The video signal of the subject of a predetermined odd numbered track recorded on the video floppy 24 is read out to a reproduction processing circuit 26 including a Y / C separation circuit, a demodulator and a de-emphasis circuit under the control of the CPU 14. The reproduction processing circuit 26 separates the read image signal of the subject into a luminance signal modulated wave and a color difference signal modulated wave, demodulates them, and restores the original characteristics. Demodulated R-
The Y and BY color difference signals are synchronized by the RY / BY synchronizing circuit 29, and the synchronized signal and the luminance signal of the reproduction processing circuit 26 are input to the NTSC encoder 30. To be done. The NTSC encoder 30 converts these signals into NTSC signals and sends the converted NTSC signals to the A / D converter 33.

The output of the A / D converter 33 is temporarily stored in the address space of the memory 34 indicated by the memory control circuit 37 instructed by the CPU 14. CPU1 here
In the case where the instruction to display the dimensions at the same time is received by key input, the reference numeral 4 reads the predetermined odd numbered track and the set even numbered track number information from the built-in memory,
The VFD interface circuit 22 is controlled to move the magnetic head 25 to the even-numbered track. When the magnetic head 25 is positioned on the even-numbered tracks, the video signal of only the scale signal is read. The read video signal of only the scale signal is processed in the same manner as the video signal of the subject, and is converted into a digital signal by the A / D converter 33. Memory control circuit 3
7 is a memory 34 in which the video signal of the subject is stored.
The video signal of only the scale signal is stored in an address space different from the address space of. After that, the image signals of only the subject and the scale signal in the memory 34 are simultaneously read out by the memory control circuit 37, combined, and converted into an analog signal by the D / A converter 35. The D / A converted analog signal is amplified by the video amplifier 36 and output from the video output terminal.

Next, the operation and recording operation for setting the dimension display mode for photographing will be described with reference to FIGS. 2 and 3. The camera is fixed to a tripod or the like. First, the zoom lens is operated so that the magnification includes the two measurement points A and B of the subject to be photographed and is as large as possible. As a result, the image of the electronic viewfinder becomes an image as shown in FIG. 2B in which the scale indicating the size and the section is not inserted. In this state, after pressing the dimension display mode switch 38, if a key operation is performed to move and stop the AF distance measurement frame on a desired subject (measurement point A), a focusing operation is performed on the subject. The focus adjustment lens position information (distance to the first measurement point) and zoom information of the zoom lens at that time are loaded into the CPU 14.
At the same time, the CPU 14 can know the position of the subject on the screen depending on which gate circuit of the CCD 3 is being controlled. By subsequently performing the key operation, the distance to the next subject (measurement point B), zoom information, and position information on the screen can be obtained. When the CPU 14 obtains the distance, the zoom information and the position information on the screen with respect to the two measurement points, it calculates the equation (1) by a predetermined algorithm and puts the distance between the two measurement points and further between them. Data on a scale (scales with arrows at both ends in FIG. 2) is calculated. Then, it is stored in the built-in memory.

When the photographer presses the release button halfway, the distance and scale data between the two measurement points are read from the built-in memory and the character and size pattern generator 19 is read.
And the size and scale are displayed between the two measured points A and B on the screen of the electronic finder. In this example, the calculated size is 5 m, and the scale output from the character and size pattern generator 19 is a scale with arrows at both ends. Here, when the photographer operates the zoom lens again to make the subject a desired size as shown in FIG. 2A, the CPU 14 uses the changed zoom information to photograph how much the original photographing magnification is used as a reference. The ratio of whether the magnification has changed is calculated. Then, the distance and the scale data between the two measurement points stored in the built-in memory are multiplied by the calculated ratio. The contour of the numerical value indicating the distance and the contour of the scale are reduced by the ratio, and the data of the numerical value and the scale indicating the reduced distance are obtained. At this time, since the information indicating the position of the scale (indicated by the positions of both ends of the scale) also moves by the reduction ratio with the center of the screen as a reference, the position information at the time of movement is also calculated. In this way, the data obtained by multiplying the original data by the changed ratio is output to the character and size pattern generator 19. As a result, as shown in FIG. 2A, the size and scale according to the size of the subject are displayed on the desired image screen. When the photographer adjusts the screen to a screen of the desired size and confirms the size-displayed screen, presses the release button, and the video signal of the subject is displayed on an odd number of tracks.
Video signals containing only scale signals are recorded on even-numbered tracks. When it is desired to display the dimensions and scale during reproduction, when the reproduction operation is performed after pressing the dimension display mode switch 38, the numerical value, unit, and scale indicating the dimensions are displayed on the image of the subject on the screen of the reproduction monitor. ..

FIG. 4 is a diagram showing examples of scales, distances, and units simultaneously displayed in the viewfinder or in the playback screen. As for the shape of the scale, in addition to the scale with the arrows at both ends used in this embodiment, various shapes can be used.

The above is an example in the case of an analog recording type electronic still camera, but it can also be applied to a digital recording type electronic still camera. In such a case, the video signal of the subject is D / A converted and then recorded in a semiconductor memory, for example, an IC memory. Since the data such as the scale is coded information, the consistency is good. When the size display is instructed at the time of photographing, the semiconductor memory stores the digital data of the object and the scale signal in the same address space or separate associated address spaces. In reproduction, if the images are stored in the same address space, the image of the subject on which the scale or the like is displayed is reproduced if read out as it is. Further, when the images are stored in different address spaces, it is possible to reproduce the image of the subject by selecting whether to insert a scale or the like.

The scale between the two points to be measured in the present invention is inserted to show which subject is the dimension, and as long as it can be confirmed which subject is shown. Often it does not have to be inserted exactly between the two objects to be measured. In the above embodiments, the video signal of the subject is recorded on the odd-numbered tracks and the scale signal is recorded on the even-numbered tracks, but the scale signal may be stored in another recording area, for example, the user's area of ID information. The case of displaying the numerical values indicating the scale and the dimension and the unit has been described, but some of them can be deleted and displayed. The display position of the numerical value and the unit is the lower part of the scale, but it may be displayed at any of the upper, lower, left and right positions of the scale. Further, the color arrangement and density of the scale or the like can be selected according to the background color. The distance between two objects to be measured is calculated by assuming two parallel planes including these measurement points, but it is regarded as a spherical surface including these measurement points and is calculated in consideration of the solid angle. It is also possible. It is also possible to express it in a vector manner as a display method of the position information of the measurement point. Further, in the present invention, the distance to the point to be measured is obtained from the lens position information, but a distance measuring sensor may be separately provided to obtain the distance. It is also possible to display the dimensions in conjunction with the strobe.

[0021]

As described above, the electronic still camera system capable of displaying dimensions according to the present invention displays the dimension between two measured points of an object captured in the same field of view and the scale between them. , The position information and zoom information and distance information at the time of focusing acquired for each measurement point are acquired on a screen enlarged from the shooting screen, calculated to calculate the dimension and scale data, and adjusted according to the magnification of the shooting screen. It is configured to display the dimensions and scale on the recalculated shooting screen. Therefore, since the information for calculating the dimensions and scale is captured on a screen enlarged from this screen, not on the screen on which the subject is photographed,
The dimensions displayed on the shooting screen are more accurate. Even if the subject is relatively small in the center of the screen, the accuracy of dimension calculation does not decrease.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a principle of calculating a distance (dimension) between two measurement points captured in a field of view of a finder.

FIG. 2 is a diagram showing an example of a screen of an electronic viewfinder or a monitor displaying a scale, a numerical value and a unit of the scale between two measured points, where (a) is a photographing screen and (b) is a dimension measurement screen. The screen at the time is shown.

FIG. 3 is a circuit block diagram showing an embodiment of an electronic still camera system capable of displaying dimensions according to the present invention.

FIG. 4 is a diagram showing examples of various scales.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens system 2 ... Aperture 3 ... CCD 4 ... Imaging system means 5 ... Color matrix 6,10 ... Character and size insert circuit 7, 11 ... Recording processing circuit 9 ... Y process circuit 14 ... CPU (control means) 16 ... Shutter Control circuit 17 ... CCD driver 18 ... Iris, auto focus control circuit 19 ... Character and size pattern generator 20 ... Contrast detector 21 ... Timing generator 22 ... VFD interface circuit 23 ... VFD (video floppy driver) 25 ... Magnetic head 26, 28 ... Reproduction processing circuit 33 ... A / D converter 34 ... Memory 35 ... D / A converter 36 ... Video amplifier 37 ... Memory control circuit

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // G02B 7/30 G03B 17/18 Z 7316-2K

Claims (1)

Claims: 1. Position information of two measured points of an object captured in the same field of view, zoom information and distance information when the positions are in focus, and the information is calculated by a predetermined arithmetic expression. To calculate the dimension data between the two measurement points and the scale indicating the section, and send the dimension and scale data to the scale pattern generator to express the dimension numerical value, unit and scale. An electronic still camera system capable of displaying a pattern of numerical values, units, and scales representing the above-mentioned dimensions at the same time as the subject screen when the photographed screen is reproduced by outputting the pattern In this state, when two measured points of the subject are specified, the position information acquired for each measured point and Calculate the size and scale data by the zoom information and distance information at the time of focusing, and then, when the shooting magnification is changed, by multiplying the size and scale data by the changed shooting magnification ratio, A control means for recalculating the size and scale to match the photographing magnification at that time is provided, and the magnification of the dimension measurement screen is made larger than that of the photographing screen to obtain zoom information, distance information and position information at the time of focusing. An electronic still camera system capable of displaying dimensions.