JP2000333075A - Television camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for outputting a video signal by which a whole picture becomes the video signal level of an appropriate exposure state by installing an area detection means detecting a bright part in an object having contrast and a multiplication means reducing the video signal level of the bright part. SOLUTION: An area detection means detecting a bright part in an object having contrast and a multiplication means reducing the video signal level of the bright part are installed. In the device, a comparator 7 compares the output signal of A/D 4 with the output of a setting value 6 which is set in a prescribed value. A multiplication control signal is outputted from the comparator 7 on a signal which is larger than the setting value 6 among the output signals of A/D 4. An area larger than the setting value 6 is detected by an area detector 8 with the multiplication control signal from the comparator 7. In the part of the detected area, the output signal of a frame memory 5 is multiplied by a number smaller than '1' in a multiplier 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a television camera.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing the prior art. In this figure, optical image light of a subject is collected by an auto iris lens 1 and photoelectrically converted by a CCD 2. The video signal subjected to the photoelectric conversion is subjected to color separation processing by a color separation circuit 3. The analog video signal that has been subjected to the color separation processing is converted into a digital signal by an A / D converter 4 (hereinafter abbreviated as A / D). The digital video signal from the A / D 4 is subjected to signal processing such as black balance, white balance, and γ correction in the signal processor 10. Signal processor 1
The output signal from 0 is input to the lens controller 11. In the lens controller 11, a signal for controlling the auto iris lens 1 is generated. The other output video signal from the signal processor 10 is converted into an analog video signal by a D / A converter 12 (hereinafter abbreviated as D / A) for converting a digital signal into an analog signal, and output by a color encoder 13. The video signal is output.

[0003]

In the above-mentioned prior art,
When photographing a subject having a difference in contrast, for example, a landscape having a sun and a shade, it is difficult to obtain an appropriate image because the sun becomes white and the shade becomes a dark image. There are drawbacks. An object of the present invention is to realize a television camera device that outputs a video signal such that the entire image has a video signal level in a more appropriate exposure state.

[0004]

In order to achieve the above object, the present invention compares an imaged image signal converted into a digital signal with a predetermined threshold value, Detect signal area. Then, the output from the imaging device converted into the digital signal is stored in the storage unit. Of the output of the storage means, the area portion exceeding the threshold value is multiplied by a number smaller than 1, for example, 0.2. The multiplied signal is output as the output of the television camera.

[0005]

FIG. 1 is a block diagram showing one embodiment of the present invention. An embodiment of the present invention will be described below with reference to FIG. The optical image light of the subject is collected by the auto iris lens 1 and photoelectrically converted by the CCD 2. The video signal obtained by the photoelectric conversion is subjected to color separation processing in a color separation circuit 3. The color-separated analog video signal is input to an A / D converter 4 (hereinafter abbreviated as A / D) for converting into a digital signal. A / D4 is A /
The digital signal obtained by the D conversion is input to the frame memory 5 and the comparator 7. The comparator 7 compares the output signal of the A / D 4 with the output of the set value 6 set to a predetermined value. Of the output signals of the A / D 4, the comparator 7 outputs a multiplication control signal for a signal larger than the set value 6. In the multiplication control signal from the comparator 7, an area (horizontal and vertical areas) larger than the set value 6 is detected by the area detector 7. The output signal of the frame memory 5 is multiplied by a number smaller than 1 (eg, 0.2) and the multiplier 9 for the detected area.
Is multiplied by The output video signal of the multiplier 9 is converted by the signal processor 10 into black balance, white balance, γ
Signal processing such as correction is performed. The output video signal of the signal processor 10 is input to the lens controller 11. The lens controller 11 generates a signal for controlling the auto iris lens 1 from the input signal. The other output video signal from the signal processor 10 is a D / A converter 12 (hereinafter abbreviated as D / A) for converting a digital signal into an analog signal.
Is converted to an analog video signal by the color encoder 1
At 3 the video signal is output.

[0006]

According to the present invention, a television camera that outputs a video signal capable of clearly displaying both the sunlit and shaded images when shooting a landscape in which both the sun and the shade are photographed. The device can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.

FIG. 2 is a block diagram showing a conventional technique.

[Explanation of symbols]

1: auto iris lens, 2: CCD, 3: color separation circuit, 4: A / D converter, 5: frame memory, 6: set value, 7: comparator, 8: area detector, 9: multiplier, 1
0: signal processor, 11: lens controller, 12: D / A converter, 13: color encoder.

Claims (1)

[Claims] 1. A television camera device for imaging a subject and converting the image into a video signal, a storage means for converting a captured image signal into a digital signal, and storing the converted signal, Comparing means for comparing a predetermined value and detecting a signal exceeding the predetermined value; area detecting means for detecting an area of the signal exceeding the predetermined value detected by the comparing means; A television camera device comprising: a multiplying means for multiplying the area detection result output and the video signal output from the storage means.