JP2001298751A - Chromakey processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chromakey processing unit with which a background color to intuitionally generate a key signal can be selected by visual observation and the range of the color can be finely adjusted. SOLUTION: The chromakey processing unit is provided with a cursor coordinate generating section 14 that generates cursor coordinates, a cursor generating section 15 that generates a cursor on the generated cursor coordinates, a latch section 16 that samples the color of a pixel of an entered key source corresponding to the generated cursor coordinates, a range calculation section 17 that calculates the spread range of a color discriminated to be the same as the sampled color, a comparison section 18 that compares the entered key source with the calculated range of color, a color pallet storage section 19 that stores the color of the pixel discriminated to be the same color as the result of the comparison as a color sample, and a synthesis display section 20 that synthesizes the color sample, the received key source and the cursor and provides an output of the synthesized signal onto a monitor, which displays the output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a chroma key processing device for controlling the synthesis of image signals using a chroma key.

[0002]

2. Description of the Related Art Conventionally, when a chroma key signal for controlling the synthesis of image signals is generated and a range of a background color is selected with respect to a foreground color, the hue and saturation of the background color are specified. I had to choose. Now, a method of selecting a background color in the conventional chroma key processing method will be described with reference to a color space graph shown in FIG. 14 as an example. In the graph of FIG. 14, the vertical and horizontal axes are RY and B-
Y (R is red, B is blue, Y is luminance), and the range 1 of the color to be set as the background color is shown therein. Therefore, the selection range 4 surrounded by the hue 2 including the color range 1 to be set as the background color and the included angle 3 is the range of the color selected as the background color.

In this conventional method of selecting a background color, the user specifies the hue and the included angle. Conventionally, this is specified on a numerical value or a hue diagram. However, in this case, it was not possible to know which part was selected on the actual input screen.

[0004]

That is, in the above-described conventional chroma key processing method, when a background color for generating a key signal is designated, the background color is displayed by a hue, a sandwich angle thereof, and a saturation degree. However, there is a problem that it is not possible to confirm which part of the actual image is processed as the background color without combining it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to finely adjust a selection of a background color and a color range for generating a key signal intuitively with eyes. And an excellent chroma key processing device.

[0006]

A chroma key processing device according to the present invention comprises a cursor coordinate generator for generating cursor coordinates, a cursor generator for generating a cursor at the cursor coordinates, and an input key corresponding to the cursor coordinates. A latch unit that samples the color of the source pixel, a range calculation unit that calculates a color spread range that is determined to be the same color as the color sampled by the latch unit, and a key source that is calculated by the range calculation unit. A comparison unit that compares the range of the extracted colors, a color palette storage unit that stores color data of pixels determined to be the same color as a result of the comparison unit as a color sample, and a color sample read from the color palette storage unit. A combination display unit that combines the key source with the cursor generated by the cursor generation unit and outputs the combined data to a monitor; It has a configuration of displaying the cursor and the color samples synthesized in the composite display unit on the key source display screen coater. With this configuration, the user
The user can intuitively select and fine-tune the background color while looking at the color samples on the color palette table.

[0007] The chroma key processing device according to the present invention includes a second comparison unit that compares the color sample read from the color palette storage unit corresponding to the sample color selected on the key source display screen with the input key source. And a signal display indicating the same color range as the selected sample color in a portion of the key source display screen that matches the color sample as a result of the comparison by the second comparison unit. . With this configuration, it is possible to easily confirm which part of the key source screen the color sample on the color pallet table corresponds to, thereby facilitating fine adjustment.

The chroma key processing device according to the present invention reads out all of the color samples designated as background colors from the color palette storage section and displays a signal corresponding to all of the designated color samples on the key source display screen as a signal. It has a configuration to do. With this configuration, it is possible to easily confirm whether or not the entire range of the color to be processed as the background color has been specified.

The chroma key processing device according to the present invention has a configuration in which a range including a plurality of colors separated from each other on the color space selected by the range calculation unit is set as the same color range. With this configuration, a wide range of colors can be specified at once without specifying all of the colors specified as the background color.

In the chroma key processing device according to the present invention, in specifying the cursor coordinates in the cursor coordinate generation section, the background color range is roughly specified in the color space, and the unnecessary color specification is deleted when the unnecessary color specification is deleted. Is made narrower. With this configuration, the range of the background color that is initially determined to be similar to the background color is widened, and the range is gradually narrowed, so that the background color range can be efficiently specified with a small number of steps.

The chroma key processing device according to the present invention has a configuration in which the composite display unit outputs composite data for display in which a part of the input key source screen is enlarged. With this configuration, a part of the key source screen is enlarged and displayed, so that it is possible to easily select the background color of the details and to easily perform the fine adjustment.

The chroma key processing device according to the present invention displays all of the colors included in the key source screen in a color pallet table by designating the cursor coordinates in the cursor coordinate generation section, and changes the background color from the displayed colors. It has a configuration of selecting. With this configuration, the background color can be efficiently determined with a small number of steps without specifying the background color one by one.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
The first to seventh embodiments of the present invention will be described in detail.
(First Embodiment) First, a chroma key processing device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3, FIG. 7, FIG. 8, and FIG. In the block diagram shown in FIG. 1, the cursor generating unit 15 generates a cursor based on the coordinates generated by the cursor coordinate generating unit 14, combines the generated cursor with the input key source by using the combining display unit 20, and outputs the combined cursor. A screen is displayed on a monitor (for example, shown in FIGS. 7 to 11).

At the same time, the color of the pixel corresponding to the coordinates generated by the cursor coordinate generation unit 14 is sampled by the latch unit 16 and output as color data. The range calculation unit 17 is set based on the sampled color data based on the color data, calculates the value of the range of color spread determined to be the same color as that color,
Reference numeral 8 compares the color range calculated by the range calculation unit 17 with the key source input on a pixel-by-pixel basis, and when it is determined that the colors are the same, records the color data of the pixel in the color palette storage unit 19. The color pallet (color sample) recorded in the color pallet storage unit 19 is formed into a table format by the combination display unit 20, combined with the input key source and the generated cursor, and output to the monitor. The color data in the range of the background color calculated by the range calculation unit 17 is stored in the storage unit 21 and output as a reference value for chroma key background color determination.

Next, the designation of the pixel color and the selection range thereof will be described with reference to a color space graph shown in FIG. In FIG. 2, when a certain pixel is designated by the cursor on the screen, the color 5 of the pixel selected by the cursor is centered.
A circle 7 having the radius of the spread width 6 of the color determined to be the same as the color becomes a range 7 of the color determined to be the same as the background color of the pixel designated by the cursor.

FIG. 13 shows the background color 4 of the key source input image.
FIG. 4 shows a schematic diagram including 0 and a foreground color 41. When the background color selection described with reference to FIG. 2 is viewed on the monitor output, it is displayed as shown in the key source screen of FIG. In FIG. 7, a color determined to be the same as the color of the pixel designated by the cursor 23 is displayed as a color sample 25 on the color pallet table 24.

Next, referring to FIG. 8 and FIG. 3, a description will be given of the designation of the pixel color and the selection range when the cursor is moved to a different place on the screen. First, as shown in FIG. 8, the cursor 23 is moved to a different place on the screen to select a pixel. As a result, as shown in the graph of the color space showing the color selection in FIG. 3, the range 9 of the color determined to be the same as the color 8 of the pixel around the color 8 of the pixel selected by the cursor is: Similarly to the color range 7 determined to be the same color as the background color, the color palette table 2 is set as the same color as the background color.
4 (FIG. 7). This is sequentially repeated so that all the background colors to be selected are included. By displaying the color samples on the color palette table 24, if a color that the user does not want to select is included, it can be immediately determined, and only the necessary color range can be easily selected. As described above, the chroma key processing device according to the first embodiment of the present invention can intuitively select and fine-tune the background color while looking at it with eyes.

According to the chroma key processing device of the first embodiment of the present invention described above, when the background color of the chroma key is designated, the pixel to be the background color is designated on the screen of the key source, and the key source is designated. The colors determined to be similar to the pixels specified in the screen are displayed in the color pallet table 24 of the chroma key setting screen, and the user can select up to the background color range on the chroma key setting screen. It is possible to specify while looking at the color sample.
According to the present invention, as described above, an excellent chroma key processing device capable of intuitively selecting and fine-tuning the background color while viewing it with the eyes is obtained.

(Second Embodiment) Next, FIGS.
The chroma key processing device according to the second embodiment of the present invention will be described with reference to FIG. First, in FIG. 6, the chroma key processing device according to the second embodiment of the present invention compares the color data output from the color pallet storage unit 19 with the key source, and when it is determined that the color is the same, It comprises a comparator 22 for outputting a coincidence signal. The other components shown in the chroma key processing device of FIG. 6 are the same as those of the chroma key processing device of FIG.

Next, the operation of the chroma key processing device according to the second embodiment of the present invention will be described with reference to a key source screen for chroma key setting shown in FIG. FIG.
Color palette table 24 of the key source screen indicated by 0
When one of the above colors, that is, the selected sample color 26 is selected, the corresponding color sample is output from the color palette storage unit 19. A signal display 27 indicating the same color range as the selected sample color 26 is synthesized and displayed on a portion on the screen where the comparator 22 determines that the color sample matches the key source screen.

In displaying, any method may be used as a method of indicating coincidence as long as it can be easily distinguished from a normal screen, such as reverse display and superimposition of a striped pattern. In this way, according to the present embodiment, it is possible to easily determine which part of the chroma key setting screen the color sample on the color pallet table 24 indicates on the screen.

Third Embodiment Next, referring to FIG. 11, which shows a case where all the color samples 28 on the color pallet table 24 are selected on the chroma key setting screen, a third embodiment of the present invention will be described. The chroma key processing device according to the embodiment will be described. In the present embodiment, in selecting a background color for generating a chroma key, all of the color samples on the color palette table 24 of the chroma key setting screen are selected.
By selecting 8 as the background color, a signal display 27 indicating the same color range as the selected sample color is synthesized and displayed in a portion having the same color as the selected background color.

When displayed in this manner, if it is desired to select a background color, but there is a portion of the background color not yet selected in the color pallet table 24, that portion is not displayed in a composite manner, so that it is easily determined. be able to. In this way, according to the present embodiment, it is possible to easily determine whether or not all the parts required as the background color have been selected in the color pallet table 24.

(Fourth Embodiment) Next, a chroma key processing apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS. 4 and 5, which are graphs of a color space showing color selection. I do. When selecting a background color that generates chroma key, if the range of colors judged to be the same as the color of the pixel selected by the cursor is narrow, a large number of selections must be repeated to specify a wide range become.
Therefore, in the present embodiment, in the range calculation unit 17,
As shown in FIG. 4, after selecting a certain color 11 with a cursor, selecting a color 12 at a distant place in the color space,
A range for determining the same color can be set so as to include these two colors at the same time. Then, the color palette table 24 displays all colors included in the range determined to be the same color.

Thus, according to the present embodiment,
To specify a wide color range, the color range can be specified with a very small number of selections. The shape surrounding the range including the two colors may be an ellipse or a circle as shown in FIG.
It may be determined according to the chroma key setting method. In this example, the color range is specified so as to include two colors at the same time. However, the color range may be specified so as to include three or more colors at the same time.

(Fifth Embodiment) Next, a chroma key processing apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. 12 illustrating the range of color selection. In the selection of the background color that generates the chroma key, displaying all the color samples of the pixels determined to be the same color on the color pallet table 24 results in an enormous amount, which is rather difficult to see. Therefore, in the specification of the position of the cursor coordinates generated by the cursor coordinate generation unit 14, initially, as shown in FIG. 12A, the color in which the saturation, lightness, hue, and the like continuously change is coarsened. Sampling is performed and only the color indicated by the circle is displayed on the color palette table 24.

Next, as shown in FIG. 12B, when it is not desired to include a certain color 29 in the background color, a color obtained by slightly sampling is displayed on the color pallet table 24 to facilitate fine adjustment. After that, a certain color 29 that the user does not want to include is deleted. When it is not desired to include a certain color 30 shown in FIG. 12B as a background color, as shown in FIG. 12C, the sampling is further finely displayed on the color palette table 24 and included. A certain color 30 which is not desired is deleted, and it is selected whether or not to include a certain color 31 which is finely sampled. In this manner, according to the present embodiment, the range of the background color can be quickly determined with a small number of steps by selecting the background color while sequentially changing the coarse sampling to the fine sampling.

(Sixth Embodiment) Next, with reference to FIG. 9 in which a part of a key source screen is enlarged and displayed, a sixth embodiment of the present invention will be described.
The chroma key processing device according to the embodiment will be described. In the present embodiment, a part of the key source screen is enlarged and displayed in the composite display unit 20 as shown in FIG. The selection of details is easier and finer adjustments are easier. However, as a means for enlarging and displaying a part of the key source screen, any other means may be used instead of using the combined display unit 20.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described.
The chroma key processing device according to the embodiment will be described. In the present embodiment, all the colors included in the key source screen are displayed on the color pallet table 24 by designating the cursor coordinates in the cursor coordinate generation unit 14, contrary to the above-described background color selection. By selecting only the color to be used as the background color, the background color can be efficiently determined with a small number of steps without specifying the background color one by one.

Although the above-described embodiment of the present invention has been described in the case where it is constituted by hardware, it goes without saying that the same effect can be obtained by processing with software.

[0031]

According to the present invention, the chroma key processing device
When the background color of the chroma key is specified as described above, a pixel to be a background color on the screen of the key source is specified, and a color determined to be similar to the pixel specified in the screen, Displayed as a color list in the color palette table of the chroma key setting screen, and allowing the user to specify the colors up to the background color range while looking at the color palette table on the setting screen. , It is possible to intuitively select a background color and fine-tune the color range for generating a chroma key signal.

[Brief description of the drawings]

FIG. 1 is a block diagram of a chroma key processing device according to a first embodiment of the present invention;

FIG. 2 is a graph of a color space for explaining color selection of a background pixel and a selection range according to the first embodiment of the present invention;

FIG. 3 is a graph of a color space for explaining color selection of a background pixel and a selection range according to the first embodiment of the present invention;

FIG. 4 is a graph of a color space for explaining a color selection of a background pixel and a selection range according to a fourth embodiment of the present invention;

FIG. 5 is a graph of a color space for describing a color selection of a background pixel and a selection range according to the fourth embodiment of the present invention;

FIG. 6 is a block diagram of a chroma key processing device according to a second embodiment of the present invention;

FIG. 7 is a diagram showing a key source screen of a monitor in the description of the first embodiment of the present invention;

FIG. 8 is a diagram showing a key source screen of a monitor in the description of the first embodiment of the present invention;

FIG. 9 is a diagram showing a key source screen of a monitor in the description of the sixth embodiment of the present invention;

FIG. 10 is a diagram showing a key source screen of a monitor in the description of the second embodiment of the present invention;

FIG. 11 is a view showing a key source screen of a monitor in the description of the third embodiment of the present invention;

FIG. 12 is an explanatory diagram for explaining a range of color selection according to a fifth embodiment of the present invention;

FIG. 13 is a schematic diagram of a key source image according to the embodiment of the present invention;

FIG. 14 is a graph of a color space for explaining color selection of a background pixel by a conventional chroma key color selection method.

[Explanation of symbols]

Reference Signs List 1 Color range to be set as background color 2 Hue 3 Interposition angle 4 Selection range to be set as background color 5 Color of pixel selected by cursor 6 Spread width of color determined as same color 7 Range of color determined as same color 8 Color of the pixel selected by the cursor 9 Range of the color determined to be the same color 11 Color of the pixel selected by the cursor 12 Color of the pixel selected by the cursor 13 Range of the color determined to be the background color 14 Cursor coordinate generator 15 Cursor Generation unit 16 Latch unit 17 Range calculation unit 18 Comparison unit 19 Color palette storage unit 20 Synthesis display unit 21 Storage unit 22 Comparison unit 23 Cursor 24 Color palette table 25 Color sample 26 Color of selected color sample 27 Color of selected color sample Signal display showing the same color range as 28 All of the color samples 29, 30, 31 A certain color 40 Background color 41 Foreground color

Claims (7)

[Claims] A cursor generating unit for generating a cursor coordinate; a cursor generating unit for generating a cursor at the cursor coordinate; a latch unit for sampling a color of an input key source pixel corresponding to the cursor coordinate; A range calculation unit that calculates a spread range of a color determined to be the same color as the color sampled by the latch unit; and a comparison unit that compares the key source with the color range calculated by the range calculation unit. A color palette storage unit that stores, as a color sample, color data of pixels determined to be the same color as a result of the comparison unit, a color sample read from the color palette storage unit, the key source, and a cursor generated by the cursor generation unit And a composite display unit that composites and outputs the result to the monitor, and the composite display unit combines the key source display screen of the monitor with the composite display unit. Chroma key processing apparatus being characterized in that so as to display the Cursor and color samples. A second comparing section for comparing a color sample read from the color pallet storage section corresponding to a sample color selected on the key source display screen with an input key source; 2. The chroma key processing device according to claim 1, wherein a signal indicating the same color range as the selected sample color is displayed in a portion of the key source display screen that matches the color sample as a result of the comparison in the second comparison unit. . 3. A method according to claim 2, wherein all of the color samples designated as background colors are read out from said color pallet storage unit, and a portion corresponding to all of said designated color samples on said key source display screen is signal-displayed. The chroma key processing device according to claim 1, wherein 4. The apparatus according to claim 1, wherein a range including a plurality of colors separated from each other in the color space selected by said range calculation unit is set as a range of the same color. A chroma key processing device according to any of the claims. 5. A method of specifying cursor coordinates in the cursor coordinate generator, wherein the range of the background color in the color space is coarsely specified, and the range of the color specification is narrowed when unnecessary color specification is deleted. 5. The method according to claim 1, wherein
The chromakey processing device according to any one of the above. 6. The chroma key processing apparatus according to claim 1, wherein said composite display unit outputs composite data for display in which a part of the input key source screen is enlarged. 7. A method according to claim 7, wherein all of the colors included in the key source screen are displayed in a color pallet table by designating the cursor coordinates in the cursor coordinate generation section, and a background color is selected from the displayed colors. The chroma key processing device according to claim 1.