JPH1146367A - Automatic color temperature correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic color temperature correction that controls a video image for having natural coloring by properly automatically correcting a color between a halogen light and an outdoor light. SOLUTION: A color temperature detection section 6 discriminates a light source, that includes an infrared ray such as a halogen light or an outdoor light and a light source that does not include infrared ray such as a fluorescent light, based on a signal received from an infrared-ray sensor 4. When the detection section 6 discriminates a light source to be that including an infrared ray, the detection section 6 discriminates the amount of an ultraviolet ray included in an optical signal by an ultraviolet-ray sensor 5 and discriminates it to be the outdoor light, if the ultraviolet-ray amount is more than a prescribed amount and discriminates it to be a halogen light if the ultraviolet-ray amount is less than a prescribed amount. Thus, in this way, more appropriate white balance is maintained in the video signal by discriminating the halogen light from the outdoor light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic color temperature correction device for automatically correcting white balance by a video camera.

[0002]

2. Description of the Related Art In recent years, video cameras have been demanded to improve the performance of automatic color temperature compensators for making images have natural colors when photographing under various light sources.

A conventional automatic color temperature correction device will be described below. Conventionally, an automatic color temperature correction device is disclosed in
No. 073 is known. FIG. 2 shows the automatic color correction device. FIG. 2 is a block diagram of a conventional automatic color temperature correction device. In FIG.
1 is a lens, 2 is an image sensor that converts an optical signal into an electric signal, 3 is a color signal generator that generates a color signal from the photoelectrically converted electric signal, and 4 generates an electric signal in response to infrared light. An infrared sensor 6 serving as an infrared detecting means, a color temperature detector 6 for detecting a color temperature based on a color signal and a signal from the infrared sensor, and a color temperature corrector 7 for correcting a color temperature according to the detected color temperature. .

[0004] The operation of the conventional automatic color temperature correction device configured as described above will be described below.

First, an optical signal incident from a lens unit 1 is converted into an electric signal by an image pickup device 2 and input to a color signal creating unit 3. The color signal creation unit 3 creates a color signal from the input signal and inputs it to the color temperature detection unit 6.

On the other hand, the infrared sensor 4 generates an electric signal in response to an infrared component of the light source, and inputs the electric signal to the color temperature detector 6. The color temperature detecting unit 6 determines a light source including infrared light such as halogen light or outdoor light and a light source not including infrared light such as a fluorescent lamp based on a signal input from the infrared sensor 4. Further, the color temperature is determined based on the color signal input from the color signal generator 3 and the color temperature corrector 7 is controlled so as to maintain an appropriate white balance of the video signal.

[0007]

However, in the above-mentioned conventional configuration, the signal from the image pickup device 2 is easily affected not only by the light source but also by the state of the subject, and the information from the infrared sensor 4 distinguishes between halogen light and outdoor light. When automatic color temperature correction is performed, white balance is lost and natural colors are not obtained. In particular, since the color temperature difference between outdoor light and halogen light is large, the white balance shift becomes large. Had a point.

The present invention solves the above-mentioned conventional problems, and provides an automatic color temperature correction device for appropriately performing automatic color correction between halogen light and outdoor light and controlling the image to have a natural color tone. The purpose is to do.

[0009]

In order to achieve the above object, an automatic color temperature compensator according to the present invention comprises an image pickup device for converting an optical signal into an electric signal, and a color signal from the electric signal photoelectrically converted by the image pickup device. A color signal generator, an infrared detector that generates an electric signal in response to infrared light, an ultraviolet detector that generates an electric signal in response to ultraviolet light, and a color signal generator. A color temperature detection unit that detects a color temperature based on a color signal, a signal from an infrared detection unit and a signal from an ultraviolet detection unit, and a color temperature correction unit that performs a color temperature correction according to the color temperature detected by the color temperature detection unit. It is a thing.

With this configuration, it is possible to distinguish between the halogen light and the outdoor light by the ultraviolet sensor, and to obtain an appropriate automatic color temperature correction device between the halogen light and the outdoor light.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an image pickup device for converting an optical signal into an electric signal, and a color signal generating section for forming a color signal from the electric signal photoelectrically converted by the image pickup device. An infrared detector that generates an electrical signal in response to infrared light, an ultraviolet detector that generates an electrical signal in response to ultraviolet light, and a color signal and an infrared detector that are created by a color signal creation unit. A color temperature detection unit that detects a color temperature based on a signal from the ultraviolet detection unit; and a color temperature correction unit that corrects the color temperature according to the color temperature detected by the color temperature detection unit. Has an effect that an appropriate automatic color temperature correction device can be obtained.

According to a second aspect of the present invention, an optical signal is converted into an electric signal, and a first electric signal obtained by reacting a color signal generated from the electric signal and infrared light and an ultraviolet light are reacted. The color temperature is detected based on the second electric signal obtained as a result, and the color temperature is corrected in accordance with the detected color temperature. It has the effect of being obtained.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram of an automatic color temperature correcting apparatus according to the present embodiment. In FIG. 1, reference numeral 1 denotes a lens unit, and 2 denotes an image pickup for converting an optical signal from the lens unit 1 into an electric signal. A device 3 for generating a color signal from an electric signal photoelectrically converted by the image pickup device 2; a color signal generating unit 4 for generating an electric signal in response to external infrared light; Reference numeral 5 denotes an ultraviolet sensor which is an ultraviolet detector which generates an electric signal in response to external ultraviolet light. Reference numeral 6 denotes a color which detects a color temperature based on signals from the color signal generator 3, the infrared sensor 4, and the ultraviolet sensor 5. The temperature detector 7 is a color temperature corrector that corrects the color temperature according to the color temperature detected by the color temperature detector 6.

The operation of the automatic color temperature compensating apparatus according to the present embodiment having the above-described configuration will be described with reference to FIG.

First, an optical signal incident from the lens unit 1 is converted into an electric signal by the image sensor 2 and input to the color signal creating unit 3. The color signal creation unit 3 creates a color signal from the input signal and inputs it to the color temperature detection unit 6.

On the other hand, the infrared sensor 4 generates an electric signal in response to an infrared component of the light source and inputs the electric signal to the color temperature detector 6. Similarly, the ultraviolet sensor 5 generates an electric signal in response to the ultraviolet component of the light source and inputs the electric signal to the color temperature detection unit 6.

The color temperature detector 6 determines a light source including infrared light such as halogen light or outdoor light and a light source not including infrared light such as a fluorescent lamp based on a signal input from the infrared sensor 4. . When it is determined that the light source includes infrared light, the ultraviolet light sensor 5 determines the amount of ultraviolet light included in the input light signal.
If less, it is determined that the light is halogen light. Further, the color temperature is determined based on the color signal input from the color signal generator 3. The color temperature is finally determined by the light source determined by the infrared sensor 4 and the ultraviolet sensor 5 and the color temperature determined by the color signal, and the color temperature correction unit 7 is controlled so as to maintain an appropriate white balance. is there.

As described above, according to the present embodiment, by using the infrared sensor 4 and the ultraviolet sensor 5 together, it is possible to solve the problem that the white balance is largely lost between the halogen light and the outdoor light depending on the state of the subject. It is possible to adjust the image to a more natural color.

[0019]

As described above, according to the present invention, an appropriate white balance can be obtained even between halogen light and outdoor light, and an excellent effect of adjusting an image to a more natural color can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automatic color temperature correction device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional automatic color temperature correction device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lens 2 image sensor 3 color signal generator 4 infrared sensor 5 ultraviolet sensor 6 color temperature detector 7 color temperature corrector

Claims (2)

[Claims] 1. An image sensor for converting an optical signal into an electric signal, a color signal generator for generating a color signal from the electric signal photoelectrically converted by the image sensor, and an electric signal generated in response to infrared light Infrared detection means, an ultraviolet light detection means for generating an electric signal in response to ultraviolet light, a color signal created by the color signal creation unit and a color temperature by the signal from the infrared detection means and the ultraviolet light detection means An automatic color temperature correction device, comprising: a color temperature detection section for detecting; and a color temperature correction section for performing color temperature correction in accordance with the color temperature detected by the color temperature detection section. 2. An optical signal is converted into an electric signal, and a first signal obtained by reacting with a color signal generated from the electric signal and infrared light.
An automatic color temperature correction device, wherein a color temperature is detected based on the electric signal and a second electric signal obtained in response to the ultraviolet light, and the color temperature is corrected in accordance with the detected color temperature.