JPH0152957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically corrects the amount of positional deviation of video signals of three channels of red (R), green (G), and blue (B) in a color television camera in accordance with the imaging situation. It is something.

Conventionally, the positioning of the R, G, and B three channel video signals was done under constant lighting and at a constant subject distance when adjusting the camera.

However, during actual camera operation, the lighting and subject distance vary depending on the imaging scene, so
The iris value and zoom ratio of the imaging lens are set to various values following the imaging scene.

Here, if the iris value or zoom ratio of the imaging lens changes, the optical aberration of the lens changes.

As a result, depending on the imaging scene, the positioning of the video signal performed under constant illumination and at a constant distance to the subject during camera adjustment may no longer be appropriate, resulting in a problem that the position of the video signal may shift.

In order to eliminate these defects, the present invention automatically corrects the amount of positional deviation of the three-channel video signal in accordance with changes in the iris and zoom ratio of the imaging lens.

The figure shows an embodiment of the present invention, in which 1 is an imaging lens, 2, 3, and 4 are three R, G, and B image pickup tubes and their deflection coils, 5 is a deflection circuit, and 6, 7, 8
is a video signal processing circuit for R, G, and B3 channels,
9 and 10 are adjusters for the iris and zoom ratio of the imaging lens 1, respectively; 11 is a position adjustment adjuster between the R, G, and B3 channel video signals; 12 is a digital-to-analog converter for the control signal of the deflection circuit 5; 13 is the regulator, the analog signal of 9 and 10
Digital converter, 14, small electronic calculator, 15
1 is a storage circuit, 16 is an analog-to-digital converter for the signal from the alignment adjuster 11, and 17 is an alignment chart.

In this operation, first, a chart 17 for positioning the video signal is imaged, and at this time, the positioning adjuster 11 is adjusted using the illumination and distance as constant values as references, and the positioning of the three-channel video signal is performed.

Then adjust the iris adjuster 9 to divide the iris value into several steps over the entire range (for example 10
At this time, the brightness of the illumination is changed so that the image level at each iris step matches the same level as when the image signal was aligned in the standard imaging situation. Then, the amount of positional deviation between the R, G, and B3 channel video signals at each iris step value is adjusted using the positioning adjuster 11 in the same manner as described above.
Align the channel video signal position.

Then, each adjustment is inputted to the small electronic calculator 14 via the analog-to-digital converter 16, and combined with each iris step value inputted to the small-sized electronic calculator 14 via the analog-to-digital converter 13 at the same time. The information is stored in the storage circuit 15 in association with each other. Similarly, the zoom ratio value adjusted by the zoom ratio adjuster 10 is divided into several steps (for example, 10 steps) over the entire range, and at this time, the captured image of the positioning chart 17 at each zoom step value is The set distance of the positioning chart 17 is changed so that the size is the same as when positioning the video signal in the standard imaging situation. Then, the amount of positional deviation between the R, G, and B3 channel video signals at each zoom step value is adjusted and aligned using the positioning adjuster 11 as described above, and each adjustment value is transferred to the analog-to-digital converter. 16
The zoom step values are input to the small electronic calculator 14 via the analog/digital converter 13, and are stored in the storage circuit 15 in combination with each zoom step value input to the small electronic calculator 14 via the analog/digital converter 13.

When operating the camera, adjusters 9 and 10
is constantly detected by the small electronic calculator 14 via the analog-to-digital converter 13, and the small electronic computer 14 stores it in the storage circuit 15 according to the values of the adjusters 9 and 10 during camera operation. The position adjustment value of the corresponding video signal that has been adjusted is read out and outputted to the deflection circuit 5 through the digital-to-analog converter 12 to correct the amount of positional deviation of each video signal due to changes in the values of the adjusters 9 and 10. do.
In addition, the regulator 9 detected by the small electronic calculator 14,
10 is a regulator 9 stored in a storage circuit 15;
If they do not match each of the 10 step values, the small electronic calculator 14 reads out the previous and subsequent step values stored in the storage circuit 15, performs interpolation calculation,
This is output to the digital-to-analog converter 12 as a position adjustment value for each video signal at that time and corrected.

That is, the present invention automatically performs corrections that match the actual imaging situation using stored positioning adjustment values for various imaging situations (iris value and zoom ratio).
Even if the iris/zoom ratio is changed, a video signal without any positional shift can always be obtained.

As explained above, according to the present invention, it is possible to realize a color camera that always obtains high-performance video signals without positional deviation between R, G, and B3 channel video signals even if the iris value and zoom ratio value of the imaging lens change. can.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the configuration of the present invention, in which 1 is an imaging lens, 2, 3, 4 are R,
G, B3 channel image pickup tube and its deflection coil,
5 is a deflection circuit, 6, 7, 8 are R, G, respectively.
B3 channel video signal processing circuit; 9 and 10 are respectively adjusters for the iris and zoom ratio of the imaging lens 1; 11 is a positioning adjuster for R, G, and B3 channel video signals; 12 is a digital-to-analog converter; 13 1 is an analog-to-digital converter, 14 is a small electronic calculator, 15 is a memory circuit, 1
6 is an analog-to-digital converter.

Claims (1)

[Claims] 1. In a color television camera having an imaging lens whose iris value and zoom ratio can be controlled remotely, the iris value and zoom ratio are changed in predetermined steps when adjusting the color television camera, and the position of each video signal in each situation is determined. Calculate alignment adjustment values, store these iris values and zoom ratio values in association with the alignment adjustment values of each video signal corresponding to each value at that time, and use the alignment adjustment values at that time when operating the color television camera. The iris value and zoom ratio of the imaging lens are detected, and the alignment adjustment values of each of the video signals corresponding to these values are read out from the stored adjustment values or by interpolation calculation, and the color television camera A method for correcting the amount of positional deviation of a video signal, characterized in that the amount of positional deviation of each of the video signals is corrected by supplying the video signal to a deflection circuit.