JPH05130496A - Image pickup device - Google Patents

Abstract

PURPOSE:To provide the image pickup device in which a video image is not seen floated in terms of a black level even when a blanking signal such as a picture frame is displayed on a monitor screen. CONSTITUTION:A blanking pulse generating circuit 16 generating switchingly any of plural blanking pulses to vary a blanking block is connected to a blanking circuit 14, and a setup changeover circuit 15 varying a setup level of a video signal is connected to a setup circuit 13 when blanking processing is implemented for a valid scanning period to vary a setup level added to a video luminance signal in response to the blanking pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus, and more particularly, to a setup for interlocking with a blanking pulse to a video luminance signal so that an original video screen does not become black when displaying blanking on a monitor screen. The present invention relates to an imaging device that changes

[0002]

2. Description of the Related Art FIG. 2 is a block diagram of a general setup addition circuit of a conventional image pickup apparatus. In the figure, a conventional image pickup device includes an image pickup element 11, a signal processing circuit 12, and
It comprises a setup circuit 13, a blanking circuit 14, and a blanking pulse input terminal 100.

Next, the operation of the conventional setup addition circuit of the conventional image pickup apparatus configured as described above will be described. First, an image of a subject is picked up by the image pickup device 11, and the image thereof is converted into a video signal so that it can be electrically processed. The video signal output from the image sensor 11 is a signal processing circuit 12
Is input to the signal processing circuit 12 and subjected to signal processing in the signal processing circuit 12, and then output from the signal processing circuit 12 to the setup circuit 13 as a video luminance signal. The setup circuit 13 adds a predetermined setup to the video luminance signal and outputs it to the blanking circuit 14. The blanking circuit 14 performs a blanking process on the video luminance signal to which the setup is added by a blanking pulse input from the blanking pulse input terminal 100.

[0004]

Since the conventional setup addition circuit is constructed as described above, for example, when blanking such as an image frame is displayed on the monitor screen, it is displayed by black level correction performed by the monitor. The black level of the entire screen is lowered, and the signal level of the video luminance signal is relatively increased, which causes a problem that the original image becomes black.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an image pickup apparatus in which an image does not appear as black even when blanking is displayed on a monitor screen.

[0006]

In order to achieve the above object, an image pickup apparatus according to the present invention generates a plurality of blanking pulses by switching them in order to change a blanking area between an effective scanning period and a blanking period. A blanking pulse generating circuit for connecting the blanking pulse generating circuit is connected to a blanking circuit, and a setup switching circuit for changing the setup level of the video signal is connected to the setup circuit when blanking processing is performed in the effective scanning period.

[0007]

Therefore, according to the image pickup apparatus of the present invention, the setup switching circuit can change the setup signal level added to the video luminance signal in accordance with the blanking pulse generated by the blanking pulse generation circuit. When displaying a blanking of an image frame or the like, the setup level is reduced by the setup switching circuit so that the image brightness signal level does not become relatively high even by the black level correction performed by the monitor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an image pickup apparatus according to this embodiment.

Referring to FIG. 1, the image pickup apparatus of this embodiment includes an image pickup element 11, a signal processing circuit 12, a setup circuit 13, a blanking circuit 14, a setup switching circuit 15, and a blanking pulse generation circuit 16. , And a changeover switch 17 (manual switch).

Next, the operation of the image pickup apparatus of this embodiment constructed as described above will be described. First, the image pickup device 11 picks up an image of a subject and converts the image into a video luminance signal so that the image can be electrically processed. Next, the video luminance signal is processed by the signal processing circuit 12 and input to the setup circuit 13 as a video luminance signal. The above operation is similar to that of the conventional image pickup apparatus.

Setup circuit 1 of the image pickup apparatus of this embodiment
3, the setup level added to the video luminance signal changes under the control of the setup switching circuit 15. That is, the blanking pulse generation circuit 16 of this embodiment switches between the blanking pulse for blanking during the effective scanning period and the blanking pulse for blanking during the normal blanking period to generate the blanking pulse, but the setup switching circuit 15 Then, the setup level is switched in conjunction with the blanking pulse of the blanking pulse generation circuit 16. The blanking pulse generation circuit 16 switches the blanking pulse and the setup switching circuit 15 switches the setup level by a changeover switch 17 set in advance by the photographer.

Therefore, when displaying blanking such as an image frame on the monitor screen, the photographer sets the changeover switch 17 in a predetermined state in advance to set the blanking pulse of the blanking pulse generating circuit 16 and the setup. The setup level of the switching circuit 15 is switched, whereby the video luminance signal output from the signal processing circuit 12 is added to the setup circuit 13 by a setup smaller than the normal setup. Then, the video luminance signal to which a smaller setup than the normal setup is added is the blanking circuit 14
In the blanking process, the blanking pulse is blanked during the effective scanning period.

As described above, in the image pickup apparatus of this embodiment, the setup switching circuit 15 lowers the setup level added to the video luminance signal in advance. Therefore, when displaying blanking such as image frames on the monitor screen,
In the conventional image pickup device, the luminance signal in the blanking area is at a lower level than the low image luminance signal of the original image, so the black level is lowered by the black level correction, and therefore the image luminance signal level is relatively high. However, in the image pickup apparatus of the present embodiment, the improvement of the video luminance signal level due to the black level correction is offset by the decrease of the setup level added by the setup circuit 13.

[0014]

As described above, according to the image pickup apparatus of the present invention, the setup switching circuit can set the signal level of the setup added to the video luminance signal in synchronization with the blanking pulse generated by the blanking pulse generation circuit. Since it is configured such that it can be changed, when displaying blanking such as an image frame on the monitor screen, it is possible to prevent blackening of the image by setting the setup level lower than usual.

[Brief description of drawings]

FIG. 1 is a block diagram of a setup addition circuit of an image pickup apparatus according to this embodiment.

FIG. 2 is a block diagram of a setup addition circuit of a conventional image pickup apparatus.

[Explanation of symbols]

 11 image sensor 12 signal processing circuit 13 setup circuit 14 blanking circuit 15 setup switching circuit 16 blanking pulse generation circuit 17 changeover switch 100 blanking pulse input terminal

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[Procedure amendment]

[Submission date] January 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

To achieve the above object, according to the Invention The imaging apparatus according to the present invention, blanking for generating switching a plurality of blanking pulse in order to the blanking area variable <br/> variable is The pulse generation circuit is connected to a blacking circuit, and a setup switching circuit that changes a setup level of a video signal when blanking processing is performed in an effective scanning period is connected to the setup circuit.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Referring to FIG. 1, the image pickup apparatus of this embodiment includes an image pickup element 11, a signal processing circuit 12, a setup circuit 13, a blanking circuit 14, a setup switching circuit 15, and a blanking pulse generation circuit 16. , And a changeover switch 17 .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Setup circuit 1 of the image pickup apparatus of this embodiment
3, the setup level added to the video luminance signal changes under the control of the setup switching circuit 15. That is, in the blanking pulse generation circuit 16 of the present embodiment, the blanking pulse that blanks in the blanking period and part of the effective scanning period and the blanking pulse that blanks in the normal blanking period are switched and generated. However, the setup switching circuit 15 switches the setup level in conjunction with the blanking pulse of the blanking pulse generation circuit 16. The blanking pulse generation circuit 16 switches the blanking pulse and the setup switching circuit 15 switches the setup level by a changeover switch 17 set in advance by the photographer.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. An image pickup apparatus comprising: a setup circuit for adding setup to a video luminance signal; and a blacking circuit for performing blanking processing of the video luminance signal with setup added thereto. A blanking pulse generating circuit for switching and generating a plurality of blanking pulses for varying the line period, and a setup switching for changing a setup level of a video signal when performing a blanking process connected to the setup circuit during an effective scanning period. An image pickup apparatus comprising: a circuit.