JPH0650517B2 - Video rate color extraction color change device - Google Patents

Description

DETAILED DESCRIPTION [Overview] An apparatus for extracting an image from a television camera at a video rate to change the color to a designated color, and processing a color extraction change for a moving image at a video rate. The purpose is to obtain red from a color image obtained from a television camera (TV).
Analog / digital conversion of (R), green (G), and blue (B) signals is performed, and the digital R, G, B signals are converted into a table by a given table in advance, and hue, saturation, and brightness are converted. Data is obtained, the data is converted into a table again, and a signal in which a pixel of a designated color (hue, saturation, lightness) is used as an effective pixel is generated in advance, and the signal designated in advance is used. It is configured to extract a pixel of color and change it to a pixel of hue, saturation, and lightness designated for the extracted pixel.

[Industrial application field]

The present invention relates to an apparatus that extracts an image from a television camera at a video rate and changes the color to a designated color.

With the recent progress in image processing technology and the widespread use of television cameras and television receivers, the color moving image is processed at a video rate by using an input / output device for the color moving image which has been economically obtained. There is a trend that is required to do so.

For example, in the medical field, it is required to make an organ having a specific color noticeable and easy to see from an image of the inside of the body captured by a television camera.

Further, in the field of clothing, there is a demand to change the color of a specific portion in a clothing image captured by a TV camera to obtain clothing most suitable for the person in real time.

In order to construct an image processing apparatus capable of coping with such a demand, it is possible to extract a pixel of a designated color from an image obtained from a television camera and change the pixel to the designated color at a video rate. Is required.

[Problems to be solved by conventional technology and invention]

FIG. 3 is a diagram showing a configuration example of a conventional video rate color extraction device.

The video rate color extraction device shown in this figure is disclosed in Japanese Patent Application No. 62-165792 filed by the applicant of the present application, and red (R) obtained from the television camera (TV camera) 1. ，
The green (G) and blue (B) signals are analog / digital (A / D) converted by the A / D conversion circuit 2, and the obtained digital R, G, B signals are given in advance in a given table. Table converter provided
(a) 3 performs table conversion to obtain hue, saturation, and lightness data, and the table conversion unit (b) 4 converts the data again into a table, and pre-designates color information (hue, hue,
A signal in which a pixel having a saturation and a brightness is used as an effective pixel is generated, and a pixel of a color designated in advance is extracted in real time by the signal.

Therefore, although the pixel of the designated color in the color image obtained from the television camera can be extracted at the video rate, there is a problem that the extracted pixel cannot be changed to the designated color.

However, for a still image, for example, by software processing, a pixel having designated color information can be extracted and the extracted pixel can be changed to a designated color. There is a problem in that moving images of the obtained video rate cannot be processed.

In view of the above-mentioned conventional drawbacks, the present invention provides a video rate color extraction color change device capable of performing color extraction color change processing on a moving image obtained from a television camera in the field of video rate image processing. That is the purpose.

[Means for solving problems]

FIG. 1 is a block diagram showing the principle of the video rate color extraction / color change device of the present invention.

The above problems are solved by the video rate color extraction color changing device configured as follows.

A device for extracting a pixel of a specified color from an image obtained from the television camera 1 and generating an image in which the pixel of the color is changed to a designated color at a video rate, the red ( R), green (G), and blue (B) analog signals that convert analog signals to digital signals, and the output of the analog / digital conversion circuit 2 as an address input, and the color of the input pixel A memory circuit a3 that outputs information (hue, saturation, lightness), a memory circuit b4 that outputs whether or not an input image is a designated color based on the color information from the memory circuit a3, and the memory circuit a3. The memory circuit c50 for converting the hue of the output from the output to the hue to be changed, the memory circuit d51 for converting the saturation of the output from the memory circuit a3 to the output to be changed, and the output from the memory circuit a3. A memory circuit e52 for converting the lightness of the force into a lightness desired to be changed, the memory circuit b4, the memory circuit c50, and the memory circuit d5.
1. The interface circuit 10 having means for changing the contents of the memory circuit e52 from an external device, the memory circuit c50, the memory circuit d51, and the memory circuit e52.
Output from hue, grading, lightness to red (R), green (G), blue
The memory circuit f6 for inversely converting to (B) and outputting, the output of the analog / digital conversion circuit 2 and the output of the memory circuit f6 are used as data inputs. And a digital / analog conversion circuit 8 for converting the output of the synthesis circuit 7 into an analog signal.

[Action]

That is, according to the present invention, in an apparatus that extracts a color from an image from a television camera at a video rate and changes the color to a designated color, red (R) from a color image obtained from the television camera (TV camera), Analogue green (G) and blue (B) signals
Digitally convert the digital R, G, B signals into a table according to a given table in advance to obtain hue, saturation, and lightness data, and convert the data again into a table, A signal having pixels of a specified color (hue, saturation, lightness) as effective pixels is generated, pixels of the specified color are extracted in advance from the signal, and a hue specified for the extracted pixel is extracted. Since the color and color are changed to pixels of saturation and lightness, color extraction and color conversion can be performed by memory table conversion, and color extraction and color change of an image obtained from a TV camera can be processed at a video rate. . Also, the hue, saturation, and red (R), green (G), and blue (B) signals
The calculation of lightness and its inverse conversion, hue, saturation, and calculation of red (R), green (G), and blue (B) signals from lightness are set to read-only memory (ROM) or set at system startup. Since it is possible to change the designated color for performing color extraction and color conversion by rewriting the table with a relatively small amount, it is possible to change the designated color in real time.

〔Example〕

 Embodiments of the present invention will be described in detail below with reference to the drawings.

The above-mentioned FIG. 1 is a block diagram showing the principle of the video rate color extraction color changing device of the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. The table conversion units (c) 50, (d) 51, (e) 52, (f) 6 and the synthesizing circuit 7 in are the necessary means for carrying out the present invention. The same reference numerals indicate the same objects throughout the drawings.

First, red input from the TV camera (TV camera) 1.
The video signals of (R), green (G) and blue (B) are respectively analog / digital conversion circuits (A / D conversion 20, 21, 22) 2
Is converted into a digital signal by the table conversion unit (a) (R
OM) 3.

In the table conversion section (a) 3, the R, G, B digital signals are used as address inputs, and are separately stored in the ROM in advance.
The hue, saturation, and lightness are output according to the contents given in 3.

The memory scale of the table conversion unit (a) 3 is 256 Kbits x 18 bits = 576 Kbytes, assuming that the input R, G, and B are each 6 bits, and the output hue, saturation, and lightness are also 6 bits. Since the content does not need to be changed, it may be converted to "ROM" as shown in this embodiment. Of course, it may be configured by a random access memory (RAM) and initially set when the system is started up.

In the next table conversion unit (b) (RAM) 4, the pixels input from the table conversion unit (a) 3 have the colors (hue, saturation, lightness) to be extracted specified by the contents of the table. Output whether or not there is.

For example, "1" is output for the pixel of the designated color, and "0" is output for other pixels.

The designation of the color to be extracted in the table conversion unit (b) 4 does not require so much accuracy, so the hue to be input,
For the saturation and lightness, for example, a total of 12 bits of the upper 5 bits (hue), 4 bits (saturation), and 3 bits (lightness) of each output of the table conversion unit (a) 3 are sufficient, and the output is 0. 4K bits x 1 because it is 1 bit indicating / 1
Bit = about 512 bytes.

In the next table conversion unit (c) (RAM) 50, the hue is converted into the hue of the color to be changed and output.

Similarly, the table conversion unit (d) (RAM) 51 converts the saturation into the saturation of the color to be changed and outputs it.

Further, the table conversion unit (e) (RAM) 52 converts the lightness into the lightness of the color to be changed and outputs it.

For these table converters (c, d, e) 50-52,
Since the output of the table conversion unit (a) 3 is 6 bits as described above, the input is 6 bits and the output is 6 bits, respectively, which means that 64 bits × 6 bits = 48 bytes will suffice.

In the next table conversion unit (f) (ROM) 6, the inverse conversion of the table conversion unit (a) 3 is performed from the hue, saturation, and lightness to red.
Outputs (R), green (G), and blue (B) digital signals.

Since the table conversion unit (f) 6 does not need to be changed, the table conversion unit (f) 6 may be formed into a ROM like the table conversion unit (a) 3. In addition, its capacity is the same as that of the table conversion unit (a) 3, 576.
It is K bytes.

In the synthesizing unit {composed of the selector 70, the selector 71, and the selector 72} 7, the output of the analog / digital conversion circuit (A / D conversion 20, 21, 22) 2 or the table conversion unit (f) 6 Either output of
It functions to select and output by the output ('0' or '1') of the table conversion unit (b) 4.

In this example, when the output of the table conversion unit (b) 4 is “1”, the output of the table conversion unit (f) 6 is set to “0”, and when the output of the table conversion unit (b) 4 is “0”, Selects and outputs the output of the analog / digital conversion circuit (A / D conversion circuit) 2.

The selected digital signal is converted into R, G, B analog signals by a digital / analog conversion circuit (D / A conversion 80, 81, 82) 8 and output to a TV monitor (TV monitor) 9 for display. To be done.

The selector 41 to the selector 520 are the host computer 11
Is used for switching when data for table conversion is set in advance in the respective RAM4 to RAM52 via the interface circuit 10.

The registers 42 to 521 function as each stage register for causing the video rate color extraction color changing device to function as a pipeline.

Thus, the invention derives from color television images.
R, G, B signals are A / D converted, and the digital signals are previously
The color information (hue, saturation, lightness) of the given table is converted into a table, and the obtained color information is converted into a table again to extract pixels having the designated color information in advance. The feature is that the extracted pixel is changed in advance to the designated color information at the video rate by the table conversion.

〔The invention's effect〕

As described above in detail, the video rate color extraction color changing device of the present invention is a device for changing the color of an image from a television camera at a video rate to a designated color. ), The red (R), green (G), and blue (B) signals from the color image are converted from analog to digital, and the digital R, G, B signals are previously
The table is converted from the given table to obtain the data of hue, saturation and lightness, and the data is converted into the table again, and the pixel of the designated color (hue, saturation, lightness) is converted into the effective pixel. Is generated, the pixel of the designated color is extracted in advance by the signal, and the pixel of the hue, saturation, and lightness designated for the extractor is changed. The color extraction color conversion can be performed by the memory table conversion, and the color extraction color change of the image obtained from the television camera can be processed at the video rate. Also red
Calculation of hue, saturation, and lightness from (R), green (G), and blue (B) signals, and its inverse conversion, hue, saturation, and red from lightness
The read (R), green (G), and blue (B) signals are calculated in the read-only memory (RO
It can be set at M) or when the system starts up, and the specified color for color extraction and color conversion can be changed by rewriting the table with a relatively small capacity, so the specified color can be changed in real time. There is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the principle of a video rate color extraction color changing device of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing a configuration example of a video rate color extraction device. In the drawings, 1 is a television camera (TV camera), 2 is an analog / digital conversion circuit (A / D conversion circuit, or A / D conversion ~), 3 is a table conversion unit (a) (ROM), or memory The circuits a and 4 are table conversion units (b) (RAM), the memory circuits b and 50 are table conversion units (c) (RAM), or the memory circuits c and 51 are table conversion units (d) (RAM). , Or the memory circuits d and 52 are table conversion units (e) (RAM), the memory circuits e and 6 are table conversion units (f) (ROM), or the memory circuits f and 7 are combination circuits (selectors, ,), 8 is a digital / analog conversion circuit (D / A conversion circuit or D / A conversion ~), 9 is a TV monitor (TV monitor), 10 is an interface circuit, 11 is a host computer, R, G, B Indicates the color signal, respectively.

Claims (1)

[Claims] 1. A device for extracting a pixel of a designated color from an image obtained from a television camera (1) and generating an image in which the pixel of the color is changed to the designated color at a video rate, the television. An analog / digital conversion circuit (2) for converting a red (R), green (G), and blue (B) analog signal obtained from the camera (1) into a digital signal, and the analog / digital conversion circuit (2) The input image is composed of the memory circuit a (3) that outputs the color information (hue, saturation, lightness) of the input pixel using the output as an address input and the color information from the memory circuit a (3). The memory circuit b (4) that outputs whether or not the specified color, the memory circuit c (50) that converts the hue of the output from the memory circuit a (3) into the hue to be changed, and the memory circuit a ( The memory circuit d (51) that converts the saturation of the output from 3) to the desired saturation, and the above memory A memory circuit e for converting the brightness you want to change the brightness of the output from the road a (3) (52), said memory circuit b (4), a memory circuit c (50), d (51), e
From the interface circuit (10) equipped with a means for changing the contents of (52) from an external device, and the hue, saturation, and lightness which are the outputs of the memory circuits c (50), d (51), and e (52). The memory circuit f (6) that reverse-converts and outputs red (R), green (G), and blue (B), the output of the analog / digital conversion circuit (2), and the memory circuit f (6) An output is a data input, and a synthesis circuit (7) for selecting and outputting either data input by the output of the memory circuit b (4) and a digital circuit for converting the output of the synthesis circuit (7) into an analog signal. / Analog conversion circuit (8), and video rate color extraction color changing device characterized by the following.