JPH0350987A - Picture synthesis device - Google Patents

Abstract

PURPOSE:To synthesize a picture even when a color of a specific position of a pattern on which a picture is replaced is any color by using a data of a specific part designated in a picture by a 1st video signal for a control signal for picture synthesis. CONSTITUTION:When an indication means 11 indicates a specific part of a picture by a 1st video signal, a storage means 12 stores a data of the 1st video signal of a specific part. A comparison means 13 compares the data with a 1st video signal on the entire screen sequentially and when the 1st video signal is the same color as the data, a select signal of the 1st logic level is generated and when the 1st video signal is a different color, the select signal of a 2nd logical level is generated and the select signal is outputted to a selection circuit 14. When the output synthesis video signal of the circuit 14 is displayed on a display section, a synthesis picture in the 1st picture by the 1st video signal in which a 2nd picture by a 2nd video signal is inserted to the area of the same color of the specific part is obtained.

Description

[Detailed Description of the Invention] (Required) Regarding an image compositing device that synthesizes a second image at a specific position on a screen based on a first image and deletes one color of the screen and changes one color, the image can be replaced. Specification of the screen (the objective is to be able to perform image composition regardless of the color of the FF position, and includes an instruction means for instructing a specific part of the image by the first video signal, and an instruction means for instructing a specific part of the image by the first video signal; the first part of the specific part
a storage means for storing data of a video signal, and successively compares the data from the storage means with the first video signal of the entire screen area, and determines whether the first video signal has the same color value as the data. the first logic level when , and the second logic level when different color values.
the first video signal, the second video signal, and the selection signal from the comparison means are input, and the selection signal is set to the first logic level. a selection circuit that selectively outputs the second video signal when the selection signal is at the second logic level, and selectively outputs the first video signal and supplies it to the display unit when the selection signal is at the second logic level. .

[Industrial application field]

The present invention relates to an image compositing device, and more particularly to an 1IiiiF&compositing device that combines a second image at a specific position on a screen formed by a first image to perform screen compositing, color deletion, and color change.

[Conventional technology]

2. Description of the Related Art Conventionally, a chromakey device as shown in FIG. 6 has been known as an image compositing device for applying special effects to a screen. In the figure, first and second video signals for people are input to input terminals 1 and 2, and the first video signal is for a person M in front of a blue screen S, as shown in FIG. is the video signal of the first image in which The signal is supplied to the gate circuit 5.

Further, the second video signal is a video signal of a second image showing a mountain as shown in FIG. 7(B), and is supplied to the gate circuit 6. The color signal extracted from the phase detector 3 described above is supplied to the key signal generation circuit 7, which generates a key corresponding to the outline of the blue screen S and the person M in FIG. 7 (△) based on the blue signal. converted into a signal.

This signal is supplied to the gate circuit 6 to gate output the second video signal during the scanning period of the previous screen S, and is supplied to the gate circuit 5 through the phase inversion circuit 8 to gate the second video signal during the scanning period of the previous screen S. During the scanning period of the area of the person M other than the screen S, the first video signal is gated out.

The video signals gated from the gate circuits 5 and 6 are combined by a combiner 9 and then output to an output terminal 10. As a result, as shown in FIG. 7(C), the output video signal of the output terminal 10 is the same as that shown in FIG. 7(A).
Behind the image, the backlash part of the blue screen S is shown in the same figure (B
) represents the composite image that has been replaced by the second image.

[Problem to be solved by the invention]

However, in the conventional apparatus described above, the area of the first image that should be replaced with the second image is always limited to a specific color (blue in FIG. The first image portion had the problem that only the specific colors mentioned above could be used.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an image compositing device that can perform image compositing regardless of the color of a specific position on a screen where images are replaced.

[Means to solve the problem]

In order to achieve the above object, the present invention has a configuration as shown in FIG. In the figure, reference numeral 11 denotes an instruction means for indicating a specific portion of the image based on the first video/& signal. 12
is a storage means that stores data of the first video signal of the specific portion. 13 is a comparison means that successively compares the above data with the first video signal of the entire screen area, and when the first video signal has the same color value as the data 1, the first logic level is set;
When the color values are different, a select signal having a second logic level is generated and output.

14 is a selection circuit which selects the first and second images 0'? and the above select signal are input, and when the select signal is at the first logic level, the second video signal is selected and output, and when the select signal is at the second logic level, the first video signal is selected and output. and supplies it to the display section.

[Effect]

In the present invention, when the instruction means 11 specifies a specific part of the image using the first video signal, the second video signal is taken out from the selection circuit 14 in the area of the same color as the specific part in the image, and the second video signal is extracted from the selection circuit 14. Since the first video signal is taken out from the selection circuit 14 in the area, when the output composite video signal of the selection circuit 14 is displayed on the display section, the same color as the specific part in the first image based on the first video signal is displayed. second in the area of
A composite image is obtained in which a second image based on the video signal is embedded (color change, color deletion, and screen composition can be performed depending on the color of this second image).

That is, in the present invention, data of a specific portion in the first video signal instructed by the instruction means 11 is used as a discrimination signal for image synthesis.

(Example) Figure 2 shows the example of the present invention! ! A block diagram of one embodiment is shown. In the figure, the same components as in FIG. 1 are denoted by the same reference numerals, and their explanations will be omitted. In FIG. 2, 16 is the instruction means 11
a personal computer (hereinafter referred to as a personal computer), 17 is a register that constitutes the storage means 12;
and 19 are selectors 20 constituting the selection circuit 14, respectively.
2 is an arithmetic circuit, and 21 is a comparison circuit. The arithmetic circuit 20 and the comparison circuit 21 constitute the comparison means 13.

It is assumed that each part in FIG. 2 is synchronized with the personal computer 16,
Also, illustration of conditions such as reset is omitted.

In FIG. 2, the video signal (2) is a digital RGB signal corresponding to the first video signal, and the video signal (2) is a digital RGB signal corresponding to the second video signal. The personal computer 16 generates a cursor signal which is a digital RGB signal. This cursor signal is a double peak signal of a cursor on the screen of the display section. This cursor can be moved to any position according to instructions from the computer 16.

The cursor signal is supplied to terminal B of the selector 18, and is also supplied as a select signal to the select terminal of the selector 18. The selector 18 has the video signal I input to the terminal A, and outputs the input video signal ■ of the terminal A during the period when the select signal is not input, and wJ+51 to which the select signal is input outputs the input cursor signal of the terminal B. Switch output.

Here, the select signal may be any one signal of RGB of the cursor signal or a specific combination, but here, circuits such as AND and OR are omitted and, for example, only one signal of R is used. It is shown in the form.

Further, the cursor signal is input to the enable terminal of the register 17. As a result, the register 17 stores the data of the video signal (2) when the cursor signal is manually operated. register 17
The data of the video signal I stored in is supplied to the arithmetic circuit 20, where a calculation is performed to set a tolerance range to eliminate defects caused by variations 1 such as color unevenness, and then the data is sent to the comparator circuit 20. 21 as a reference value.

The comparator circuit 21 has a configuration as shown in FIG. 3, and compares the reference value with the value of the video signal I, and when the video signal ■ has substantially the same color value as the color indicated by the reference value, the comparison circuit 21 compares the reference value with the value of the video signal I. At a logic level of 1, when a color value different from the color indicated by the reference value is detected, a select signal of a second logic level is generated, and this is input to the select terminal of the selector 19.

In FIG. 3, a digital red signal (R signal), a digital green signal (G signal), and a digital blue signal (m number (B signal), which constitute the video signal I, are connected to a comparator 23a,
It is input to one input terminal of 23b and 23c, respectively.

On the other hand, arithmetic units 20a and 20b forming the arithmetic circuit 20
Digital R (ffi
signal, digital G signal and digital B signal are sent to comparator 2.
Other input terminals 3a, 23b and 23c are input.

The comparators 23a, 23b, and 23c are respectively applied with the register output signal, register G output signal, and register output signal from the register 17 as control signals, and determine whether the value of the control signal is larger than a preset value. The comparison logic is switched and controlled accordingly.

That is, the comparator 23a compares the value a of the digital R signal with the value a' of the output digital R signal of the arithmetic unit 20a, but when the value of the register output signal is greater than the set value, a≧a. A high level (first logic level) signal is output only when 'a', and a low level signal (second logic level) is output when a<a'.
On the other hand, when the value of the register R output signal is smaller than the set value, a low level signal is output when a≧a', and a high level signal is output when a<a'. has been done. the other two comparators 23b,
The comparator 23c also has the same configuration as the comparator 23a.

Each output signal of the comparators 23a, 23b and 23c is AN
The D circuit 24 performs a logical product and outputs the signal as a select signal, which is applied to the select l terminal of the selector 19 in FIG. As a result, when the select signal is at a low level, the selector 19 outputs the output (n) of the selector 18 that is input to terminal A, and when the select signal is at high level, it outputs the video signal that is input to terminal B. ■Select and output.

Therefore, from the selector 19, a synthesized video signal is taken out which shows an image in which the image area of the same color as the cursor position in the image based on the output video signal of the selector 18 is covered in moss over the image based on the video signal (2).

This will be explained in more detail. Assume now that the video signal (2) is an image of a person M and its fv view, as shown in FIG. 4(A), the background is red, and the person M is in a color other than red. Further, it is assumed that the video signal (2) is a landscape image as shown in FIG. 4(B). In addition, digital R
signal, digital G signal, and digital B signal each has 8
It shall be bit.

In the initial state, the selector 19 selectively outputs the video signal from the selector 18, so when the cursor is not present, only the image of the video signal worker shown in FIG. 4(A) is displayed on the display screen. ing. In this state, Basson 16
When the cursor is specified by operating the selector 18, the cursor signal is synthesized and taken out by the video signal generator, and this synthesized video signal further passes through the selector 19 and is input to the display section, so that the screen does not display the cursor signal. As shown in FIG. 4(D), an image in which the cursor image &26 is superimposed on the image of the video signal I is displayed. .

Here, it is assumed that the cursor image 26 is positioned within the red area of the background at the top left of the screen. The data of the video signal ■ of the image 26 at the specified position of this cursor is
a=200/256. b==6/256, C=
Assume that it is 4/256. However, b indicates the value of the digital G signal, and C indicates the value of the digital B signal.

In this case, if the value of a at the position indicated by Pl in the back mL of FIG. 4(D) is also 200/256, the image can be replaced with the image of the video signal ■ without the arithmetic circuit 20. However, even if the background is a single color of red, there are variations such as color unevenness, and the value of a is 1 at the position of Pl in Figure 4 (D).
If it is 98/256, the image of the Pl portion will remain.1 Therefore, an arithmetic circuit 20 is provided to determine the tolerance range of ±α by some method (fixed, switch, external C
PU, etc.) and supplying it to the arithmetic circuit 20, all red can be removed from the screen of FIG. 4(D).

For example, the allowable range is +2/'256 for R signal and ±3/256 for G signal. Assuming that the length of the B signal is 1/256, the value a' of the R output of the Korean generator 20a in FIG. 3 is 198/256. The value b' of the G output of the operator 20b is 9
/258. The value C' of the B output of the 20c is 5/256
The value is .

Also, compare! 23a, 23b, and 23c are each controlled by a control signal so as to output a high level signal when a≧a', b<b', and c<c'. On the other hand, as mentioned above, a=200/256, b=
6/256. c = 4/256, and the value of the Pl part is a' = 198/256. b
' = 9/256, C' = 5/256, so all the conditions of the above inequality are not satisfied. Therefore, comparator 23a.

High level output signals are all taken out from each of 23b and 23C, so the output signal of the AND circuit 24 also becomes high level. Therefore, in the portion Pl of FIG. 4(D), the select signal to the selector 19 becomes high level.

Similarly, the select signal to the selector 19 is at a high level during the period when the video signal ■ of the portion jWL on the back of FIG. Output.

Therefore, according to this embodiment, the screen of the display unit is displayed as shown in FIG.
As shown in Figure C), in the image consisting of the person M and the back 1iL shown in Figure (A), the entire area of the yt song in red, which is the same color as the image where the cursor is located, is in the style shown in Figure (B). A composite image is displayed that is completely intoxicated with the purchased image.

Here, if the image based on the video signal ■ is made into a full-screen black or white achromatic-color image, the background [color] can be deleted, and the image based on the video signal When using an image, you can change the background color.

Note that even if the hue of the back FIL is green, for example,
When the cursor is located inside the back ff1L, the comparator 23
a, 23b and 23c each have a<a' due to the control @ signal.
, b≧b' and c<c', the change control is performed so that a high level signal is output. Therefore, a select signal that is at a high level can be obtained from the NO circuit 24 during the scanning period of the back IML. Therefore, the background can be replaced with any image based on the video signal H.

Next, a second embodiment of the present invention will be explained. FIG. 5 is a block diagram of a second embodiment of the present invention, in which the same components as in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. Fifth
In the figure, the signal generator 31 can generate any color, color bar,
Generates and outputs a video signal (■) of any image such as a moving image. The coordinate designation circuit 32 also has an H counter 33 and a V counter 3.
It operates in synchronization with 4 and is specified by the user.
The horizontal and vertical coordinates within the image area to be replaced are outputted and supplied to matching circuits 35 and 36, respectively.

H counter 33 and V counter 34 receive video signals ■ and ■
horizontal synchronization signal and vertical synchronization signal (counters whose values step in step in phase synchronization with the i number, and their outputs are input separately to the matching circuit 35.36., matching circuit 35.36
outputs a high level signal and supplies it to the ANf) circuit 37 when the values of the two human input signals match each other.

Therefore, at each coordinate position in the horizontal direction and vertical direction specified by the coordinate designation circuit 32, the H counter 33° and the V counter 3
The video signal I indicated by each value of 4.

When the image scanning positions in the horizontal and vertical directions (2) match, a high level signal is taken out from the AND circuit 37 and applied to the load end f of the load terminal register 38 as a load signal. As a result, the load terminal register 38 latches and captures the video signal MI input to the data input terminal at the time the load signal is input, and transfers the latched video signal data to the arithmetic circuit 20 and the comparison circuit 2.
Output to 1.

The present embodiment differs from the first embodiment only in that data at a position specified by XY coordinates on the screen is used as a control signal, and image synthesis similar to that in the first embodiment can be performed.

Note that the present invention is not limited to the above embodiments; for example, the digital R signal, digital G signal, and digital B signal include a color signal component and a luminance signal component, so the i-degree signal By adding conditions, it is also possible to switch the selector 19 depending on the brightness of the colors.

〔Effect of the invention〕

As described above, according to the present invention, data of a designated specific portion of an image based on the first video signal is used as an interface for image synthesis.
Because it is a IIIll signal, it is not only possible to replace only a preset single color (for example, blue) part with another image, but also to replace the part of the same color as the specified specific part with another image. Therefore, it is possible to delete the color, change the color, or change the color of the above-mentioned specific part to be combined with other screens to any color, making it possible to perform image composition with fewer restrictions than before. It has the following features.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a block diagram of the first embodiment of the invention, Fig. 3 is a block diagram of an embodiment of the comparator circuit, and Fig. 4 shows the various parts of Fig. 2. 5 is a block diagram of a second embodiment of the present invention, FIG. 6 is a block diagram of an example of a conventional device, and FIG. 7 is an explanatory diagram of images of each part of FIG. 6. In the figure, 11 is an instruction means, 12 is a storage means, 13 is a comparison means, 14 is a selection circuit, 18.19 is a selector, 20 is an arithmetic circuit, 21 is a comparison circuit, and 17.38 is a register with a load terminal. . Figure 3 Figure 7 of Ichigosei H's 5n Koshi 2'' Figure 2 (A) (B) Figure 5 (C)

Claims (1)

[Scope of Claims] Instructing means (11) for instructing a specific part of an image by a first video signal, and storing data of the first video signal of the specific part indicated by the instructing means (11). a storage means (12) for successively comparing the data from the storage means (12) with the first video signal of the entire screen area, and determining whether the first video signal has the same color value as the data; comparing means (13) for generating and outputting a select signal having a first logic level when the color value is a different color value and a second logic level when the color value is different; The comparison means (1
3) is input, and when the select signal is at the first logic level, the second video signal is selected and output, and when the select signal is at the second logic level, the second video signal is input. 1. An image synthesis device comprising: a selection circuit (14) for selectively outputting one video signal and supplying the selected video signal to a display unit.