JPH0814752B2 - Video rate color extraction device - Google Patents

Description

DETAILED DESCRIPTION [Outline] In the field of video rate image processing, red (R), green (G), and blue (B) signals obtained from a color image are A / D converted, and digital R, G, The B signal is converted into a table by a given table to obtain hue, saturation, and lightness data, and the data is converted again into a table to generate a signal in which a pixel of a designated color is an effective pixel. The pixel of the color designated in advance by the signal is extracted in real time.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for processing a color extraction of a designated color from a color image at a video rate and capable of performing the color extraction in real time.

[Conventional technology]

An example of a conventional video rate color extraction device is shown in FIGS. 3 and 4. In FIG. 3, reference numeral 30 is a color image input section configured by a TV camera or the like, 31 is an A / D conversion section for converting an analog signal input from the color image input section 30 into a digital signal, and 32 is a table conversion section. , 33 is a host computer that outputs various data required for video rate color extraction, and 34 is an interface that realizes data transfer between the table conversion unit 32 and the host computer 33. Further, reference numeral 35 is a D / A conversion unit for converting the digital signal output from the table conversion unit 32 into an analog signal, and 36 is a TV monitor. The output from the image input unit 30 is divided into R, G, and B component analog TV signals and input to the A / D conversion unit 31. This A
A / D converter 31 is an A / D converter 41, 4 corresponding to each of the R, G, B components.
It is composed of 2,43 and performs A / D conversion for each component.

The table conversion unit 32 includes a selector 44, a register 45,
It consists of memories 46, 47 and 48. The D / A converter 35 connected to the table converter 32 is composed of D / A converters 49, 50, 51. Memories 46, 47, and 48 are provided corresponding to the R, G, and B components of the extracted colors, respectively, and each D / A converter 4
9, 50 and 51 are respectively connected to memories 46, 47 and 48 in order to perform D / A conversion on the R, G and B components of the color.

In such a video rate color extraction device, the color image signal (which is an analog signal) transferred from the image input section 30 is decomposed into R, G, B components and the corresponding A / D converters 41, 42, It is input to 43, converted into a digital signal here, and input to the selector 44. Selector 44 is each A / D converter 4
Input the output signals of 1, 42, 43 and interface 34
It is connected to the host computer 33 via the host computer 33, and data should be input from the A / D converters 41, 42, 43 according to the selection instruction of the host computer or the host for rewriting the contents of the memories 46, 47, 48. It is selected whether the address input given by the computer 33 should be input, and one is output. The data output from the selector 44 is temporarily stored in the register 45 and outputs the address data to the memories 46, 47, 48 in synchronization with the clock operation.
Each of the memories 46, 47, and 48 has an address area of the signal output from the register 45 and a table of a designated color given in advance, and the table is converted according to an instruction from the host computer to extract the designated color. Do. Color-extracted color image data is sent to each D / A converter 49, 50, 5
It is converted into an analog signal in 1 and transferred to the TV monitor 36 as an analog TV signal.

[Problems to be solved by the invention]

However, in such a conventional video rate color extraction device, when it is desired to change the designated color, it is necessary to change the memories 46, 47 and 48 for storing the color data, which are R, G and B. Since it has to be performed for each component of, there is a problem that it takes a lot of time to change the memory. Therefore, there is a problem that the video rate color extraction operation cannot be performed in real time.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a video rate color image processing capable of processing extraction of a predetermined color from a color signal of a color image in real time in video rate image processing. It is to provide an extraction device.

[Means for solving problems]

FIG. 1 is a block diagram showing the configuration principle of the present invention.
As shown in this figure, the video rate color extraction device according to the present invention, from the R, G, B signals obtained from the image input unit 20 configured by a TV camera or the like for reading a color image, of the specified color A video rate color extraction device for extracting an image, wherein an A / D conversion unit 21 for converting each analog signal of R, G, B into a digital signal and an address input of the digital signal of the A / D conversion unit 21 And a first table conversion unit 22 for outputting pixel color information corresponding to the address input,
The pixel table color information from the table conversion section 22 is used as an address input, and the second table conversion section 23 having a memory means for outputting information as to whether the address input is valid or invalid, and the A / D conversion section 21 output A digital signal to be input and the output from the second table conversion unit 23 is valid, the mask calculation unit 24 that outputs the digital signal, and the digital signal output from the mask calculation unit 24 are analog signals. Convert to D /
The configuration is composed of an A conversion unit 27 and a TV monitor 28 that displays an image output from the D / A conversion unit 27 and subjected to video rate color extraction.

The first table conversion unit 22 holds a table of capacity capable of storing all color information and inputs it.
The color information of the pixel is output corresponding to the R, G, B address signals. When the output from the second table conversion unit 23 is valid, that is, the pixel of the designated color, the mask calculation unit 24
It has a function of outputting the digital signal from the A / D converter 21 as the input image data as it is and not outputting it in the case of colors other than the designated color.

[Action]

The image data (signal) input from the image input unit 20 is A /
After being converted into a digital signal by the D conversion unit 21, it is transferred to the mask calculation unit 24 as original image data. On the other hand, the first
All the pixel color information is stored in the table conversion unit 22 and the stored color information is sequentially output to the second table conversion unit 23. And the second table conversion unit
Reference numeral 23 designates the color information from the first table conversion unit 22 as an address input, and outputs valid / invalid information for this address. When this is output as valid, the mask calculation unit 24 makes the A / D The designated color is extracted by performing the selection and the process of directly outputting the digital signal from the conversion unit 21. Then, the output of the mask calculation section 24 is converted into an analog signal in the D / A conversion section 27, and the image is displayed on the TV monitor 28.

〔Example〕

FIG. 2 is a block diagram showing an embodiment of the video rate color extraction device according to the present invention. In this figure, reference numeral 1
Reference numerals 2 and 3 are A / D converters that convert analog signals corresponding to R, G, and B components into digital signals, and 4 is a first table conversion unit 22 that stores all color information used for color extraction. It is a read-only memory (hereinafter referred to as ROM) that constitutes the. 5
Is a selector for selecting the output data of the ROM 4 and the instruction data from the host computer 25, 6 is a register for temporarily storing the output data of the selector 5, and 7 is rewritable in which color designation data for performing color extraction is stored. Memory (hereinafter referred to as RAM). Further, 8, 9, 10 are registers for temporarily storing the R, G, B components of the input image data, 11, 12, 13 are data inputs for the outputs of the respective registers 8, 9, 10 and the outputs of the RAM 7 There are three states in which one of the bits is enabled and a mask operation is performed. Also 14,15,16 are 3 states 11,12,
It is a D / A converter that converts the digital signal corresponding to the R, G, B components output from 13 into an analog signal. And the second
In the figure, the A / D converters 1, 2, 3 constitute an A / D converter 21, the ROM 4 constitutes a first table converter 22, while the selector 5, the register 6 and the RAM 7 make a second memory.
The table conversion unit 23 is configured to include the registers 8, 9, 10 and 3
The mask calculation unit 24 is configured by the states 11, 12, and 13. Further, the D / A converters 14, 15, 16 constitute a D / A converter 27.

In the color extraction device having such a configuration, the image input unit
The color image data input from 20 is divided into R, G, B analog signals, converted into digital signals by the A / D converters 1, 2, 3 and synchronized with the clock CL, for example, as 8-bit data. Is output. The ROM 4 stores a table of all color information, receives the output from the A / D converters 1, 2, 3 as address data and outputs the color information of the pixel corresponding to the address. The memory capacity of this ROM4 is 16 Mbytes x 3 = 48 Mbytes when the R, G, B digital signals are 8 bits (By the way, when the digital signals are 6 bits, 256 Kbytes)
Bytes x 3 = 768 Kbytes).

The selector 5 is a host computer 25 together with the data input of ROM4.
The address data specified by the command is input via the interface 26, and the output data of the ROM4 is sent to the register 6 during the color extraction operation under the selection instruction of the host computer, and sent from the host computer 25 during the table conversion to the RAM7. The generated address data is sent to the register 6. The register 6 temporarily stores the data and outputs the data to the RAM 7 in synchronization with the clock CL. An address input from the register 8 and rewriting data and rewriting instruction data from the host computer 25 are input to the RAM 7, and a signal for outputting the input (original image) of the mask calculation unit 24 as it is during the color extraction operation is given. On the other hand, for the pixels other than the designated color, table conversion for giving a signal that makes the output of the mask calculation unit 24 zero is performed. The RAM 7 stores the data from the host computer 25, thereby generating a signal in which a pixel of a color designated in advance is an effective pixel, and the pixel of the designated color is extracted by this signal by 1-bit output. Therefore, the memory capacity is small, and the data can be easily changed even when the host computer rewrites the memory contents, so that the designated color can be changed in real time.

Further, in the mask calculation unit 24, the output of the RAM 27 is H (high).
In the case of, the input image is output as it is, and in the case of L (low), the output is set to 0. When outputting the A / D converted signals as they are, the registers 8, 9 and 10 respectively input the input image data of R, G and B and the clock signal CL and synchronize with the output of the RAM 7. The three states 11, 12, and 13 respectively correspond to R, G, and B signals, and the output data of the registers 8, 9, and 10 and the 1 bit output from the RAM 7 are input as valid bits and processed and output. The output data from the three states 11, 12, and 13 are input to the D / A converters 14, 15, and 16 corresponding to R, G, and B, respectively, together with the clock signal CL, converted into analog signals, and output. The analog signal after D / A conversion is already the first
As described based on the drawing, it is transferred to the TV monitor 28 and displayed as a color image.

The method of generating the contents of the table that enables color extraction by the above table conversion is as follows. R, G,
B is the R component, G component, and B component of the TV signal (0 = <R <
= 1,0 = <G <= 1,0 = <B <= 1).

Hue: r And the saturation: β And the lightness α is α = 0.30 × R + 0.59 × G + 0.11 × B. Here, 5 bits of the value representing color: COL (10 bits) is hue (0 = << r <= 31), and 3 bits is saturation (0 =
<Β <= 7), 2 bits are expressed as brightness (0 = << α <= 3). When COL is given in this way, for example, when it is desired to specify a bright red color, the content of the second table conversion unit 23 is 13 = <r <= 16,3 = <β <= 7,1 = <α <=
The value 1 of the address represented by 3 (the original image is passed through by the mask calculation) may be stored. By the way, in the case of bright yellow, 17 = ＜ r ＜ ＝ 20,3 ＝ ＜ β ＜ ＝ 7,1 ＝ ＜ α
The value of the address represented by <= 3 may be set to 1.

〔The invention's effect〕

As described above, according to the present invention, R, G, B digital signals obtained from the image input unit are used as address inputs,
The table is divided into two stages, a first table conversion unit that outputs pixel color information corresponding to the address input and a second table conversion unit that receives the pixel color information as an address input.
Since the memory means of the second table conversion section outputs the information as to whether the digital signal is valid or invalid, it is only necessary to rewrite the contents of the memory means relating to the second table conversion section having a small memory capacity. , It is possible to change the designation of the color to be extracted, so that it is possible to change the designation of the color to be extracted in real time, and it is possible to process the image input from the image input unit at the video rate. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the principle of the present invention, FIG. 2 is a circuit diagram showing an essential part of a color extracting device according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of a conventional color extracting device. FIG. 4 is a diagram showing the internal structure of the color extracting device shown in FIG. 20,30 …… Image input unit 21 …… A / D converter 22 …… First table converter 23 …… Second table converter 24 …… Mask calculator 25,33 …… Host computer 26,34 ...... Interface 27,35 …… D / A converter 28,36 …… TV monitor

Claims (1)

[Claims] 1. From R, G, B signals obtained from an image input unit,
A video rate color extraction device for extracting an image of a specified color, wherein an A / D conversion unit for converting each analog signal of R, G, B into a digital signal, and a digital signal of the A / D conversion unit Is used as an address input, and a first table conversion unit that outputs pixel color information corresponding to the address input and pixel color information from the first table conversion unit are used as address inputs, and whether the address input is valid or invalid. A second table conversion unit having a memory means for outputting the information of, and a digital signal output by the A / D conversion unit,
When the output from the table conversion unit is valid, a mask calculation unit that outputs the digital signal, a D / A conversion unit that converts the digital signal output from the mask calculation unit into an analog signal, A video rate color extraction device comprising means for monitoring the output from the A conversion unit.