JP2884626B2 - Television video signal special effects device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television video signal special effect device utilizing digital processing of a television video signal.

[Conventional technology]

The conventional television video signal special effect device includes a memory unit and controls a write address and a read address for the memory to create a desired special effect.

An example of a conventional read address generator of this kind of television image signal special effect device will be described with reference to FIG.

In the figure, reference numeral 61 denotes an input terminal to which an input clock signal is applied. Coordinates (X, Y) output from an X coordinate generator 62 and a Y coordinate generator 63 synchronized with the input clock signal from the input terminal 61, respectively. And a specific straight line r where x and y are variables representing coordinates is a function ax + by + c = 0 (where a ² +
b ² = 1, a> 0, b> 0, 0 ≦ c ≦ m, 0 ≦ c ≦ n, m: maximum possible X coordinate, n: maximum possible Y coordinate) constant a generator 64, constant b generator 65 and constant c for generating b and c
From the output of the generator 66, the distance between the straight line r and the coordinates (X, Y) is calculated by the distance calculator 67.

Then, the output d of the distance calculator 67 is input to two function generators 68 and 69 for mapping the distance. Each of the function generators 68 and 69 has a function F of a value u when the input is u to a readable / writable memory.
(U) or a memory in which an appropriate value is written so as to be G (u). These two function generators 68,6
From each of the outputs F (d) and G (d), the X and Y coordinates of the pixel data to be read are stored in the coordinate calculators 70, 71 and 72 for each output of the function generators 68 and 69, respectively. , 73. In the data selector 74, the output F (d) of the function generator 68
Output X _F of the coordinate calculator 71 calculated from a set of Y _F, also the output X _G of the coordinate calculator 72 calculated from the output G of the function generator 69 (d), the Y _G 1 It is considered as a set, and whether or not one set of coordinates (X _G , Y _G ) is within the effective range of the image is determined by the in-effective range determiner 75, and if (X _G , Y _G ) is within the effective range, For example, (X _G , Y _G ) is selected as the read address X coordinate 77 and the read address Y coordinate 78; otherwise, (X _f , Y _f ) is selected. Then, whether the read address X coordinate 77 and the read address Y coordinate 78 output from the data selector 74 are within the valid range of the image is determined by the valid range determination unit 76, and the valid range instruction output 79 of the image is made. .

When a video signal as shown in FIG. 7 showing an example of an input video signal is input by a television video signal special effect device having a read address generator configured as described above, a special effect obtained from this input signal is obtained. As shown in FIG. 8, which shows an example of output, a paper placed on a plane is deformed into a shape rounded along a circle having a radius r to obtain a special effect of outputting.

[Problems to be solved by the invention]

In the read address generator of the conventional television video signal special effect device described above, one of the two sets of the X coordinate and the Y coordinate output from the coordinate calculator is within the effective range of the image. It is determined whether or not there is, and using the result of the determination, the data is switched by the data selector.
There is a problem in that there is a limitation that a special effect is applied to all portions within the effective range of the image.

[Means for solving the problem]

The television video signal special effects device of the present invention encodes an analog video signal to obtain a coded video signal.
An A / D converter and an output video signal of the first A / D converter
An image memory for storing images or more, a write address generator for determining a location of the image memory to be written corresponding to the input image, and a read for reading data for each pixel of the image from the image memory In a television video signal special effect device having an address generator and an A / D converter for decoding an encoded video signal read from the image storage into an analog video signal, an input key corresponding to the input video signal A second encoding of the signal to obtain a key signal
An A / D converter and an output key signal of the second A / D converter are set to 1
A key signal storage unit for storing more than the image data, wherein the read address generator includes a coordinate generator for generating a coordinate value, and a coordinate calculation for applying a special effect by using an output value of the coordinate generator as an input. And if a key signal corresponding to the output value of the coordinate generator from which the output value of the coordinate calculator is present exists in the key signal coordinate value, the output value of the coordinate calculator is read out. And a data selector for outputting the output value of the coordinate generator as a read address when the key signal does not exist. Only a video signal corresponding to a portion where the key signal exists by input of the key signal is provided. It is designed to be effective.

[Action]

In the present invention, a special effect is applied only to a portion of a video signal corresponding to a portion where an input key signal exists.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a television video signal special effect apparatus according to the present invention.

In the figure, 1 is an input terminal to which an input video signal is applied, 2 is an input terminal to which an input key signal is applied, 3 is an A / D converter that encodes an analog video signal to obtain an encoded video signal, and 4 An image memory for storing the output video signal of the A / D converter 3 for one image or more, 5 is a write address generator for determining the location of the image memory to be written corresponding to the input image, 6 is a key signal An A / D converter that encodes an input to obtain an encoded key signal; 7 is a key signal storage that stores the output key signal of the A / D converter 6 for one image or more; 8 is a read address generator; This read address generator 8
And a key signal storage unit 7 includes a read address generator 9 for reading data for each pixel of an image from the image storage unit 4.
Is composed.

10 is an output of the image memory 4 and a read address generator 8
Background adder that receives the image effective range instruction output from
Reference numeral 11 denotes a clock generator which receives an input video signal from the input terminal 1 as input, and 12 denotes an encoded video which receives the output of the clock generator 11 and the output of the background adder 10 as input and is read from the image storage 4. A D / A converter that decodes the signal into an analog video signal, 13 is a synchronizing signal adder that receives an output of the D / A converter 12, and 14 is an output terminal from which an output signal is obtained.

Then, a special effect can be applied only to a video signal corresponding to a portion where the key signal exists by the key signal input.

 Next, the operation of the embodiment shown in FIG. 1 will be described.

First, input video signals and input key signals applied to input terminals 1 and 2 are encoded into digital signals by A / D converters 3 and 6, respectively. Then, the video signal output from the A / D converter 3 is written to the image storage 4 by the output of the write address generator 5 that specifies the location of the image storage 4 to be written corresponding to the video signal, It is saved until the next field. Similarly, the key signal output from the A / D converter 6 is also written into the key signal storage unit 7 by the output of the write address generator 5,
It is saved until the next field.

The read address generator 9 is a portion surrounded by a dashed line in FIG. 1 and includes a read address generator 8 and a key signal storage 7. When calculating the read address (X coordinate and Y coordinate) of the video signal to be read by the read address generator 8, the output from the X coordinate generator and the Y coordinate generator (not shown) in the read address generator 8 is a key signal. Sent to storage unit 7. In the key signal storage 7, the key signal stored one field before is read in parallel with the writing of the key signal by using the X coordinate and the Y coordinate sent from the read address generator 8, and the key signal exists. Then, the result is sent to the read address generator 8 again. The read address generator 8 determines a video signal to be read based on the result of the determination of the presence or absence of the key signal sent from the key signal storage 7, and outputs the video signal to the image storage 4.

Next, the image storage unit 4 reads the video signal one field before in parallel with the writing. And
The background is added to the video signal read from the image storage 4 by the background adder 10 by the instruction signal within the effective range output from the read address generator 9 (read address generator 8), and D / A The signal is decoded by the converter 12 and further added with the synchronization signal supplied from the input terminal 1 by the synchronization signal adder 13 and output from the output terminal 14 as a normal television video signal.

FIG. 2 is a block diagram showing an embodiment of the read address generator in the television video signal special effect device of the present invention.

In the figure, 21 is an input terminal to which a clock input is applied, 22 and 23 are X and Y coordinate generators 24 and 25 synchronized with an input clock signal from the input terminal 21 and
26 is a constant a generator, a constant b generator, and a constant c generator,
27 is a distance calculator, 28 and 29 are function generators, 30, 31, 32 and 33 are coordinate calculators, 34 is an in-effective range determiner, 35 is a data selector,
36 is a key signal storage, 37 is a data selector, 38 is a delay unit,
39 is an effective range judgment device, 40 is a read address X coordinate,
41 is a read address Y coordinate, and 42 is an image effective range instruction output.

 Next, the operation of the embodiment shown in FIG. 2 will be described.

First, the coordinates (X, Y) output from the X coordinate generator 22 and the Y coordinate generator 23 synchronized with the input clock signal from the input terminal 21 and the identification when x and y are variables representing the coordinates. Ax + by + c = 0 (where a ² + b ²
= 1, a> 0, b> 0, 0 ≦ c ≦ m, 0 ≦ c ≦ n, m: maximum possible X coordinate, n: maximum possible Y coordinate) constant a generator 24, constant b generator 25, constant c generator for generating c
The distance calculator 27 calculates the distance between the straight line r and the coordinates (X, Y) from each output of 26. The output d of the distance calculator 27 is used as two function generators 28 and 2 for mapping distances.
Enter 9 Both function generators 28 and 29
For a readable and writable memory, a memory is used in which an appropriate value is written so that the value read out when the input is u is a function F (u) or G (u) of u.

From the outputs F (d) and G (d) of the function generators 28 and 29, the stored X and Y coordinates of the pixel data to be read are calculated for each output of the function generators 28 and 29, respectively. Calculators 30, 31, 32, 33 The output X _F of the coordinate calculator 30 and 31 output calculated from F (d) of the data selector 35 a function generator 28, Y _F a set, also from the output G of the function generator 29 (d) The outputs X _G and Y _G of the calculated coordinate calculators 32 and 33 are regarded as one set, and an in-effective range determiner 34 determines whether or not one set of coordinates (X _G , Y _G ) is within the effective range of the image. If (X _G , Y _G ) is within the effective range, select (X _G , Y _G ), otherwise select (X _F , Y _F ).

Next, the key signal storage 36 reads out the outputs (X, Y) of the X coordinate generator 22 and the Y coordinate generator 23 from which the output values output from the data selector 35 are based on the key signal storage 36. As an address, it is determined whether or not a key signal exists for this read address. If the key signal is present, the data selector 37 outputs the read address X coordinate 40 and the read address Y coordinate 41
And if there is no key signal, the delay
The coordinates (X, Y) output from the X coordinate generator 22 and the Y coordinate generator 23 delayed at 38 are selected. The delay unit 38 outputs the read address of the video signal when a special effect is applied from the data selector 35 after the coordinates (X, Y) are output from the X coordinate generator 22 and the Y coordinate generator 23. This is for delaying the input data by the amount of delay until the data is input.

The in-effective range determiner 39 determines whether or not the output of the data selector 37 is within the effective range of the image, and outputs the determination result as an effective range instruction output 42 of the image.

The key signal storage 36 can store the input key signal for one image or more, but it is necessary to store the input key signal corresponding to the input video signal in the key signal storage 36.

FIGS. 3, 4 and 5 show the video signal, the key signal and the special effect output obtained from these two input signals to the television video signal special effect device having the read address generator of the present invention. It is explanatory drawing which shows an example. The hatched lines in FIG. 4 indicate portions where no key signal exists.

〔The invention's effect〕

As described above, the present invention provides an A / D converter that encodes an input key signal to obtain an encoded key signal, and converts the encoded key signal encoded by the A / D converter into one image. By having the key signal storage device that stores the above, it is possible to realize a television video signal special effect device that can apply a special effect only to a video signal portion corresponding to a portion where an input key signal exists. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a television image signal special effect device according to the present invention, and FIG. 2 is a block diagram showing an embodiment of a read address generator in the television image signal special effect device of the present invention. FIGS. 3, 4 and 5 are explanatory diagrams showing examples of a video signal, a key signal, and a special effect output obtained from these two input signals, which are input to the television video signal special effect device of the present invention.
FIG. 6 is a block diagram showing an example of a read address generator of the conventional television video signal special effect device, and FIGS. 7 and 8 show the video signal input to the conventional television video signal special effect device and the video signal. FIG. 4 is an explanatory diagram illustrating an example of a special effect output obtained from an input video signal. 3 ... A / D converter, 4 ... Image storage, 5 ... Write address generator, 6 ... A / D converter, 7 ... Key signal storage, 8 ...
Read address generator, 9 ... Read address generator, 10 ... Background adder, 11 ... Clock generator, 12 ... D / A converter, 13 ... Synchronous signal adder.

Claims (1)

(57) [Claims] 1. A first A / D converter for encoding an analog video signal to obtain a coded video signal, and an image storage for storing one or more output video signals of the first A / D converter. A write address generator for determining a location of an image storage to be written corresponding to an input image; a read address generator for reading data for each pixel of an image from the image storage; In a television video signal special effect device having a D / A converter for decoding an encoded video signal read from a storage device into an analog video signal, an input key signal corresponding to the input video signal is encoded and encoded. A second A / D converter for obtaining a key signal; and a key signal storage for storing an output key signal of the second A / D converter for one image or more, wherein the read address generator includes: Coordinate generation that generates coordinate values And a coordinate calculator for performing a coordinate calculation for applying a special effect using the output value of the coordinate generator as an input, and a key signal corresponding to the output value of the coordinate generator from which the output value of the coordinate calculator is based A data selector that outputs the output value of the coordinate calculator as the read address when the key signal storage exists, and outputs the output value of the coordinate generator as the read address when the key signal does not exist. A special effect device for a television video signal, wherein a special effect can be applied only to a video signal corresponding to a portion where a key signal exists by inputting a key signal.