Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-12-28
1993-01-12
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
382 48, H04N 964, H04N 1702
Patent
active
051794373
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for the color correction of image signals of a color television camera.
BACKGROUND ART
As the automatic adjustment in a color television camera, there have been performed registration, white balance, adjustment of levels of respective parts of a process amplifier and optical tracking of an image pick-up element. However, color correction such as hue correction or color saturation correction has not been automatically conducted.
There has been known a system in which automatic adjustment is carried out by using chromatic test charts of white, black and gray so that levels of image signals R, G and B are higher than prescribed values, but this adjustment is luminance adjustment and not color correction.
Color correction has been manually conducted. Namely, an external test chart signal generator is used, and adjustment of the color of a color television camera is carried out while comparing a test chart image by signals from this generator on a television monitor with an image obtained by photographing a test chart by a television camera.
According to this manual adjustment, however, a test chart signal generator, a signal changeover device and the like should be prepared and a monitoring operation should be carried out while carrying out changeover operations by an operator. Accordingly, the operation is troublesome and a long time is required for the operation.
In the case where a special effect is produced by using a plurality of cameras, it is very troublesome and difficult to perform the same color correction for respective cameras.
The present invention has been completed under this background, and it is a primary object of the present invention to provide a color correction apparatus for a color television camera, in which color correction can be easily carried out and the color correction operation can be automatized and in which when the color correction operation is automatized, the same color correction can be simultaneously performed for a plurality of color television cameras.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, there is provided a color correction apparatus for a color television camera, which comprises a test chart signal-generating circuit disposed in the interior of a camera device or outside the camera device to generate a color test chart signal, and a signal changeover circuit for changing a test chart signal from the test chart signal-generating circuit and a signal obtained by photographing a test chart by the camera device over to each other and outputting said signals and a color correction circuit for making color correction of at least the signal obtained by photographing the test chart by the camera device, said signal changeover circuit and color correction circuit being disposed in the camera device.
In this basic structure of the present invention, color correction by the color correction circuit is performed by the changeover operation by the signal changeover circuit disposed in the camera device, while comparing a test chart signal generated from the test chart signal-generating circuit disposed in the interior of the camera device or outside the camera device with a signal obtained by photographing a test chart by the camera device.
There can also be adopted a structure in which the above-mentioned signal changeover circuit and a control circuit for automatically controlling the color correction circuit based on an external signal are disposed in the camera device.
If this structure is adopted, color correction can be performed based on various data. Furthermore, if a function of comparing a test chart signal from the test chart signal-generating circuit with a signal obtained by photographing the test chart by the camera device while controlling the signal changeover circuit and controlling the color correction circuit so that the same image can be obtained is given, for example, to the control circuit, color correction can be automatically performed.
Moreover, the above-m
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patent: 3987482 (1976-10-01), Robers
patent: 4285004 (1981-08-01), Morrison
patent: 4326219 (1982-04-01), Griesshaber
patent: 4414573 (1983-11-01), Griesshaber
patent: 4709260 (1987-11-01), Geerts
patent: 5065351 (1991-11-01), Johnston
Degawa Katsumi
Ioka Shoichi
Kawada Norihiko
Miyamoto Moriki
Yamashita Masahiro
Chin Tommy P.
Ikegani Tsushinki Co., Ltd.
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