JP2625854B2 - Matte color effect generator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matte color effect generator, and more particularly to a matte color effect generator for providing a matte color effect for freely changing the color of a specified portion of a video signal. About the vessel.

[Conventional technology]

The matte color effect of extracting and specifying a color of a specified portion of a video signal and changing the color to a desired color is well known. Conventionally, this type of matte color effect generator can change the color only at a certain level (luminance) or higher.

[Problems to be solved by the invention]

The conventional matte color effect generator described above can change the color only at a certain level or higher, and the color change is extremely small in a red part with a low color level and a face part with a low color level. There is a disadvantage that it is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a matte color effect generator which eliminates the above-mentioned drawbacks and can change the color of only a specified portion such as a face.

[Means for solving the problem]

The matte color effect generator of the present invention is used to encode a component television video signal (RGB).
An A / D converter, a gate circuit for passing only a predetermined portion of the signal encoded by the A / D converter, and a cursor for setting the predetermined portion.
r) A cursor generator for generating a signal, a register (1) for holding its output at a certain timing, a register (2) for holding data as it is without passing through the gate circuit, and an output of the register (2) A comparator that inputs and compares the output of the register (1) and outputs a pulse, a multiplier that changes data only in a preset portion of the output of the register (2), and a coefficient of the multiplier. And a tri-state register (1) for holding a value from the CPU data bus, and fixed data 1.
And a tri-state register (2) for giving 00 to control the tri-state register (1) with a pulse obtained from the comparator and inverting the pulse to control the tri-state register (2) to input A mat key processor for performing mat key processing, a D / A converter for D / A converting the output of the mat key processor, and a read clock generator for generating a reference pulse for the A / D converter and the mat key processor And R
・ It is equipped with three sets of GB.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is an overall block diagram of an embodiment of the present invention.
FIG. 2 is a detailed block diagram of the mat key processor 2 of FIG. FIG. 1 shows an embodiment of an A / D converter 1 for encoding a component video signal (RGB).
It comprises a mat key processor 2 for applying a matte color effect to the output of the A / D converter 1, a D / A converter 3 for converting the output of the mat key processor 2 into an analog signal, and a read clock generator 4.

In FIG. 1, component video signals (R, G,
B) are first input to the A / D converter 1 and encoded. This encoded signal is then supplied to the mat key processor 2. Hereinafter, the component video signal R will be described as an example with reference to FIG.

The encoded component video signal is output to the AND gate 2
The signal is input to 1-1, and is output by a cursor signal as a gate pulse for passing by one pixel obtained from the cursor generator 29. This output is stored in register (1) 22
-1 and latched by a single clock.
The latched output is input to the comparator 24-1 and compared with the original unprocessed data supplied through the register (1) 23-1.

On the other hand, the original data output from the register (2) 23-1 is also input to the multiplier 28-1, and the level is varied only in the portion designated by the cursor signal as follows.

The variable amount of the level described above is calculated in advance by the CPU and latched as a coefficient through the tri-state register (1) 26-1 via the CPU data bus.

The tri-state register (1) 26-1 is controlled by a coincidence pulse output from the comparator 24-1.

The tri-state register (2) 27-1 latches the fixed data 1.00 so as not to change the level of the part not specified by the cursor signal, and is controlled by the above-mentioned coincidence pulse inverted by the inverter 25-1. In this way, the color can be changed only in a specific portion.

FIG. 3 is an explanatory diagram showing an example of the matte color effect image of the embodiment of FIG. FIG. 2 (a) shows the setting of a cursor when the color of the face 104 of the person 102 projected on the screen 101 is changed.
Position. By applying the matte color effect to this specific portion, the color of the face 104 changes as shown by the cross line in FIG. 2 (b).

〔The invention's effect〕

As described above, the present invention stores color data of a specific portion extracted and specified from a video, compares the stored data with original data, and performs a mat key process for providing a matte color effect. By controlling only the portion, there is an effect that the color can be changed even in a portion such as a face having a low color level.

[Brief description of the drawings]

1 is an overall block diagram of one embodiment of the present invention, FIG. 2 is a detailed block diagram of a mat key processor 2 of the embodiment of FIG. 1, and FIG. 3 is a mat color effect of the embodiment of FIG. FIG. 4 is an explanatory diagram illustrating an example of an image. 1 ... A / D converter, 2 ... Mat key processor, 3 ...
... D / A converter, 4 ... Read clock generator, 21-
1-21-3 AND gate 22-1-22-3 Register (1), 23-1-23-3 Register (2) 24-1
... 24-3 ... Comparator, 25-1 to 25-3 ... Inverter, 26-1 to 26-3 ... Tristate register (1), 27-1 to 27-3 ... Tristate register (2) , 28-1 to 28-3 ... Multipliers.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-17282 (JP, A) JP-A-56-43885 (JP, A) JP-A-60-160275 (JP, A) JP-A-63-1988 46070 (JP, A) JP-A-60-155363 (JP, A) JP-A-62-79497 (JP, A) JP-A-60-160275 (JP, A) JP-A-56-140785 (JP, A) JP-A-61-223893 (JP, A)

Claims (1)

(57) [Claims] 1. A component television video signal (R)
An A / D converter for encoding G / B), a gate circuit for passing only a preset portion of the signal encoded by the A / D converter, and a cursor for setting the preset portion A cursor generator for generating a (cursor) signal, a register (1) for holding its output at a certain timing, a register (2) for holding data as it is without passing through the gate circuit, and a register (2). A comparator for inputting the output and the output of the register (1) and comparing them to output a pulse, a multiplier for changing data only in a preset portion of the output of the register (2), and a coefficient of the multiplier Tri-state register (1) to hold the value from the CPU data bus
And a tri-state register (2) for providing fixed data 1.00 as a coefficient in addition to a preset portion of the output of the register (2). The tri-state register (1) is controlled by a pulse obtained from the comparator. A mat key processor for inverting the pulse and performing mat key processing on the input while controlling the tri-state register (2); and a D / A converter for D / A converting an output signal of the mat key processor. And a read clock generator for generating a reference pulse for the A / D converter and the mat key processor.