JPH033480A - Electronic view finder with zoom function - Google Patents

Abstract

PURPOSE:To attain focusing while observing a magnified picture and to observe a magnified video image for a required part by switching a picture sent from a VTR integrated type camera and the picture magnified by a magnification circuit with a switch and displaying the result on a display section. CONSTITUTION:Switches SW1, SW2 deciding the position of magnifying a video image in an electronic view finder 2 and the magnification factor are provided, and a control circuit 5 gives a command to a magnification display circuit 4 by using the information from the switch. A magnification display circuit 4 decides the magnified position and the magnification with the command from the control circuit 5 and generates a magnification signal to be displayed on a display section 10 from the video signal inputted to the electronic view finder 2. The user uses a changeover switch SW 3 to display the signal inputted to the electronic view finder 2 onto the display section 10 as it is or display the magnified signal generated by the magnification display circuit 4 and displays the result on the display section 10. Thus, it is possible to make focusing while observing the magnified picture or observing the magnified image of the required part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic viewfinder with a zoom function that has a function of enlarging an image displayed within the finder in an electronic viewfinder of a VTR-integrated camera.

[Conventional technology]

Conventional electronic viewfinders have been considered as monitoring devices when using a VTR-integrated camera, so
Emphasis was placed on faithfully reproducing images captured by a video camera and displaying the status of the video camera.

In addition, when manually focusing a video camera with a zoom function, the focus is adjusted using the electronic viewfinder, but in this case, the focus is adjusted by zooming to the telephoto side. .

This is because the focus becomes poorer when zooming to the telephoto side after focusing on the wide side, and this is due to the difficulty of focusing on the wide side.

Examples of this type of electronic viewfinder include those described in Japanese Utility Model Publication No. 63-12617, and those equipped with a monitor TV, such as those described in Japanese Patent Application Laid-Open No. 61-150474.

[Problem to be solved by the invention]

In the prior art described above, the electronic viewfinder used in the VTR-integrated camera is mainly used to determine the angle of view.

It is also used for manually adjusting focus and checking recorded tapes.

However, it is difficult to manually focus the image in the finder at the wide end when recording, and it is necessary to set the camera to the -degree tele end, focus, and then adjust the angle of view.

Furthermore, during playback, it is often possible to view a portion of the recorded screen without viewing the entire recorded screen, but even in such cases, the entire recorded screen must be viewed, even if it is small and difficult to see.

The present invention magnifies and focuses only the screen displayed in the electronic viewfinder while keeping the angle of view fixed during recording, and magnifies only the part you want to see during playback.
The purpose of the present invention is to provide an electronic viewfinder with a zoom function that allows viewing on an easy-to-read screen.

[Means to solve the problem]

The above purpose is to provide a video signal enlargement display circuit between a video signal input section and a display section of an electronic viewfinder, and further to provide a control circuit for controlling the enlargement display circuit, and this control circuit is integrated into a VTR. The camera user selects the enlarged part of the image and determines the enlargement rate, and controls the enlargement display circuit.The display on the 1 display section displays the image sent out from the VTR-integrated camera as it is. This is achieved by providing a changeover switch that determines whether to display the image or to display the image enlarged by the enlargement display circuit.

[Effect]

A switch is provided to determine the magnification position and magnification rate of the image in the electronic viewfinder. Based on the information from the switch, the control circuit issues a command to the magnification display circuit. The magnification display circuit magnifies the image according to the command from the control circuit. The position and magnification are determined, and an enlarged signal to be displayed on the display unit is created from the video signal input to the electronic viewfinder.

The user uses the selector switch to select whether to display the signal input to the electronic viewfinder as is on the display, or to display an enlarged signal created by the enlargement display circuit, and then displays the signal on the display. You can see it.

This allows you to view the enlarged image, adjust the focus, and view the enlarged image of the desired area.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an electronic viewfinder with a zoom function according to the present invention, in which a video signal 1a sent from a VTR-integrated camera 1 is input to an electronic viewfinder 2. As shown in FIG.

The above video signal 1 input to the electronic viewfinder 2
a is divided into two parts, one goes into the electronic viewfinder 2's synchronization separation, horizontal/vertical signal output and video processing circuit 3 (hereinafter referred to as EVF signal processing circuit 3), and the other goes into the enlargement display circuit. 4 is input.

On the other hand, the control circuit 5 includes an EVF signal processing circuit 3.
to horizontal and vertical timing signals 3a.

3b will be sent to you. Further, a switch SWI and a switch SW2 are connected to the control circuit 5, and by using the SWI, a cross-shaped cursor, for example, is displayed on the display section 1o, and the enlarged position is indicated by moving it up and down on the screen of the display section 10, for example. Then, the magnification rate is determined using SW2.

The enlargement position and enlargement rate determined by SW1 and SW2 are determined by the timing signal 3a and the control circuit 5.
Position information signal 5a and magnification information signal 5b synchronized with 3b
The image is sent to the enlarged display circuit 4 as an image.

In the enlarged display circuit 4, the display section 10 of the input video signal 1a is controlled by the information signals 5a and 5b from the control circuit 5.
The part to be displayed is separated horizontally and vertically and extracted to create an enlarged signal.

Horizontal and vertical timing signals 3a are sent from the EVF signal processing circuit 3 to the enlarged signal.

3b is used to add a synchronizing signal to create an enlarged display signal 4a, which is output to the switching circuit 6.

On the other hand, the switching circuit 6 receives V from the EVF signal processing circuit 3.
A signal 3a obtained by first-stage amplification of the video signal 1a sent from the TR-integrated camera 1 is sent.

The signal levels of the signals 3a and 4a sent to the switching circuit 6 are set to better suit the amplifier circuits in the enlarged display circuit 4 and the EVF signal processing circuit 3.

An external switch SW3 is connected to the switching circuit 6.
This SW3 selects whether the signal sent from the switching circuit 6 to the signal processing circuit 7 is the standard signal 3a or the enlarged display signal 4a.

The signal processing circuit 7 converts the input signal into a signal to be displayed on the display unit 10, amplifies it, and outputs the signal.

On the other hand, the EVF signal processing circuit 3 outputs horizontal heel motion and vertical drive signals, which control the horizontal and vertical directions of the display section 10 through the horizontal motion circuit 8 and the vertical drive circuit 9.

The enlarged display circuit 4 also has an initial setting function and a power supply
FFL has a function that remembers previous settings unless otherwise specified.

The initial setting function is, for example, after turning on the power, SWl and SW2.
If you operate SW3 to enlarge the display without operating , the screen will be displayed at twice the size with the center of the screen as the center.

In addition, this initial setting function can be operated separately from the position and magnification. For example, if you want to move only the position and leave the magnification as the initial setting, use SWI
Operate only to determine the position.

Next, operate SW3 to enlarge the image. If you want to fix the position and change only the magnification, you can operate SW2 and SW3.

FIG. 2 is a block diagram showing an embodiment of the enlarged display circuit 4, in which a device information signal 5 composed of a control circuit 5 is shown.
a, the magnification information signal 5b is input to the gate circuit 42.

The gate circuit 42 provides position and magnification information 5a.

5b, a gate signal 5c and a magnification signal 5d for extracting the video signal 1a are created in synchronization with the timing signals 3a and 3b.

On the other hand, in the video memory circuit 41, the VTR integrated camera 1
The video signal 1a sent from the timing signal 3a,
3b, the video signal is temporarily stored in memory, extracted in accordance with the gate signal 5C from the gate circuit 42, and further enlarged in accordance with the magnification signal 5d. Enlargement of the video signal is performed by repeatedly reading out the same signal from the video memory circuit 41 several times depending on the enlargement magnification.

The expanded video signal has no synchronization signal attached and is sent to the fifth-order synchronization addition circuit 43.

On the other hand, a synchronization signal generation circuit 44 generates horizontal and vertical synchronization signals in synchronization with the timing signals 3a and 3b.

This synchronization signal is sent to the synchronization addition circuit 43 and added as a synchronization signal to the enlarged display signal 4a. This video signal is level-matched by the video amplification circuit 45 and output from the enlarged display circuit 4.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to easily focus by enlarging only the image in the finder while keeping the angle of view fixed, and it is also possible to partially enlarge the image during both recording and playback. It is possible to provide an electronic viewfinder with an excellent zoom function, which allows the user to enjoy enlarging and displaying the part he or she wants to see, and which eliminates the problems of the prior art described above.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an electronic viewfinder with a zoom function according to the present invention, and FIG. 2 is a block diagram showing an embodiment of an enlarged display circuit 4. As shown in FIG. 1...VTR integrated camera, 2...Electronic viewfinder, 3...EVF signal processing circuit, 4...Enlarged display circuit, 5... ...Control circuit, 6...Switching circuit, 7...
・Signal processing circuit, 8...Horizontal ll! dynamic circuit, 9.
...Vertical motion circuit, 1o...Display section, 4
1...Video memory circuit, 42...Gate circuit, 43...Synchronization addition circuit, 44...
...Synchronization signal generation circuit, 45...Video amplification circuit.

Claims (2)

[Claims] 1. In a VTR integrated camera equipped with an electronic viewfinder, the VT is installed in the electronic viewfinder.
A circuit for enlarging a part of the image transmitted from the R-integrated camera and a circuit for controlling the enlargement circuit are provided, and the image transmitted from the VTR-integrated camera and the image enlarged by the enlargement circuit are provided. An electronic viewfinder with a zoom function that can be changed with a switch and displayed on the display. 2. 2. The electronic viewfinder with a zoom function according to claim 1, wherein the control circuit further includes an initial setting function for an enlargement position and an enlargement ratio.