Apparatus for color correction of image signals of a color television camera

A color correction apparatus for at least one color television camera, which comprises:

• a first camera device, said first camera device comprising a test chart signal-generating circuit for generating a color test chart signal;
• a first signal changeover circuit for alternately switching between said color test chart signal from said test chart signal-generating circuit and a signal obtained by photographing a test chart by said camera device and outputting each of said color test chart signal and said signal obtained by photographing the test chart;
• a first color correction circuit for color-correcting at least said signal obtained by photographing the test chart;
• a first control circuit, said first control circuit comprising means for automatically controlling said first signal changeover circuit and said first color correction circuit by an external signal;
• said first color correction circuit comprising a circuit passing therethrough for carrying one of said color test chart signal and said signal obtained by photographing the test chart through said first color correction circuit;
• a circuit bypassing said first color correction circuit for carrying said color test chart signal around said first color correction circuit;
• a second changeover circuit for alternately switching between said circuit passing through said first color correction circuit and said circuit bypassing said first color correction circuit;
• said first control circuit comprising a correction data-detecting circuit for comparing said signal carried through said first color correction circuit with said signal carried around said first color correction circuit and detecting data of color correction generated by said first color correction circuit;
• and
• a correction-controlling device for controlling color correction of at least one additional camera device, said at least one additional camera device comprising a second color correction circuit and a second control circuit, and said correction-controlling device being for controlling color correction of said at least one additional camera device by said second color correction circuit of said at least one additional camera device through said second control circuit of said at least one additional camera device based on the data detected by said first correction data-detecting circuit of said first camera device.

A color correction apparatus for at least one color television camera, which comprises:

• a test chart signal-generating circuit for generating a color test chart signal, said test chart signal-generating circuit being disposed outside a first camera device;
• a first signal changeover circuit disposed in said first camera device, said first signal changeover circuit for alternately switching between said color test chart signal from said test chart signal-generating circuit and a signal obtained by photographing a test chart by said camera device and outputting each of said color test chart signal and said signal obtained by photographing a test chart;
• a first color correction circuit for color-correcting at least said signal obtained by photographing the test chart by the camera device, said color correction circuit being disposed in said first camera device;
• said first color correction circuit comprising a circuit passing therethrough for carrying one of said color test chart signal and said signal obtained by photographing the test chart through said first color correction circuit;
• a circuit bypassing said first color correction circuit for carrying said color test chart signal around said first color correction circuit;
• a first control circuit, said first control circuit comprising means for automatically controlling said first signal changeover circuit and said color correction circuit by an external signal, said first control circuit for comparing said color test chart signal outputted from said test chart signal-generating circuit with the signal obtained by photographing said test chat while controlling said first signal changeover circuit, and controlling said color correction circuit so that an image obtained from said color test chart signal is essentially identical to an image obtained from said signal obtained by photographing the test chart;
• a second changeover circuit for alternately switching between said circuit passing through said color correction circuit and said circuit bypassing said color correction circuit;
• said first control circuit comprising a correction data-detecting circuit for comparing said signal carried through said first color correction circuit of said test chart signal-generating circuit with said signal carried around said first color correction circuit and detecting data of color correction generated by said first color correction circuit;
• and
• a correction-controlling device for controlling color correction of at least one additional camera device, said at least one additional camera device comprising a second color correction circuit and a second control circuit, and said correction-controlling device being for controlling color correction of said at least one additional camera device by said second color correction circuit of said at least one additional camera device through said second control circuit of said at least one additional camera device based on the data detected by said first correction data-detecting circuit of said first camera device.

A color correction apparatus for at least one color television camera, which comprises:

• a test chart signal-generating circuit for generating a color test chart signal, said test chart signal-generating circuit being disposed outside a first camera device;
• a first signal changeover circuit disposed in said first camera device, said first signal changeover circuit for alternately switching between said color test chart signal from said test chart signal-generating circuit and a signal obtained by photographing a test chart by said camera device and outputting each of said color test chart signal and said signal obtained by photographing a test chart;
• a first color correction circuit for color-correcting at least said signal obtained by photographing the test chart by the camera device, said color correction circuit being disposed in said first camera device;
• said first color correction circuit comprising a circuit passing therethrough for carrying one of said color test chart signal and said signal obtained by photographing the test chart through said first color correction circuit;
• a circuit bypassing said first color correction circuit for carrying said color test chart signal around said first color correction circuit;
• a first control circuit, said first control circuit comprising mean for automatically controlling said first signal changeover circuit and said color correction circuit by an external signal;
• a second changeover circuit for alternately switching between said circuit passing through said color correction circuit and said circuit bypassing said color correction circuit;
• said first control circuit comprising a correction data-detecting circuit for comparing said signal carried through said first color correction circuit of said test chart signal-generating circuit with said signal carried around said first color correction circuit and detecting data of color correction generated by said first color correction circuit;
• and
• a correction-controlling device for controlling color correction of at least one additional camera device, said at least one additional camera device comprising a second color correction circuit and a second control circuit, and said correction-controlling device being for controlling color correction of said at least one additional camera device by said second color correction circuit of said at least one additional camera device through said second control circuit of said at least one additional camera device based on the data detected by said first correction data-detecting circuit of said first camera device.