KR0149522B1 - Image processing method and apparatus for commercial computer - Google Patents

Abstract

The present invention relates to a method and apparatus for image processing using a general-purpose computer. The present invention converts signals extracted from a color filter on a solid-state image pickup device into a digital form by directly inputting the color coded image pickup device camera to a general-purpose computer connected to the computer. To extract. Therefore, the present invention not only simplifies the hardware configuration of the image processing system using a computer, but also directly extracts the RG B signal, thereby synthesizing the R, G, and B signals into a composite video signal, and again, the RG B. It provides an effect that can improve the resolution by preventing a decrease in resolution inevitably occurred in the process of extracting information.

Description

Image processing method and apparatus using general-purpose computer

1 is a circuit diagram showing an image processing apparatus using a conventional general-purpose computer,

2 is a conceptual diagram showing a color filter arrangement of a single-plate color solid-state imaging device (CCD),

3 is a block diagram showing an image processing apparatus using a general-purpose computer according to the present invention.

* Explanation of symbols for main parts of the drawings

10: solid state imaging device 20: correlated double sampling unit

60: A / D converter 70: interface

80: general purpose computer

According to the present invention, when a color solid-state imaging device camera is used for image processing using a computer, a signal extracted from a solid-state imaging device (hereinafter referred to as a CCD) is directly digitally converted and input to a connected computer to extract color information. An image processing method using a general-purpose computer for simplifying the hardware configuration of an image processing system and an apparatus thereof.

Nowadays, image processing technology using a computer is very developed. In particular, photographs required for electronic publishing or personnel management are taken by using a camcorder, etc., and the captured video signals are recorded through T.I.F. Save as a graphic file in the form of) and later combine it with the document. At this time, red (R), green (G), and blue (B) signals, which are color signals, are extracted from the signal output from the CCD that converts the photographed object into an electrical signal, and the image signal is extracted. Extract color information and save it as a graphic file. A block diagram showing such an image processing apparatus using a conventional general purpose computer is shown in FIG.

1 is a circuit diagram showing a conventional image processing apparatus using a general-purpose computer, wherein a photoelectric conversion signal obtained from a solid state image pickup device (CCD) 10 on a photographing apparatus such as a camcorder is selected from a correlated double sampling unit; In the CDS) 20, reset noise and amp noise are removed. The signal from which the noise is removed is input to the color information extraction unit 30 and extracted as R, G, and B signals. Before describing the specific extraction process, the color filter of the color CCD shown in FIG. 2 will be described. do.

FIG. 2 is a conceptual diagram showing the color filter arrangement of the single plate color (CCD) 10. Green, G, Cyan, Magta, Mg, and Yellow (Ye) are shown in FIG. The color filters are arranged in mosaic on each pixel. When the photocharges of each unit image are driven by field reading, the color signals of four colors are output by mixing the charges in two columns. In the order of the output charges, [G + Cy], [Mg + Ye], [G + Cy], and [Mg + Ye] are output as signals in the current input line (0H). Looking at the previous 1H line, the output is in the order of [Mg + Cy], [G + Ye], [Mg + Cy], [G + Ye]. It can be seen that the color signal is alternately changed every 1H cycle.

The correlation double sampling unit (CDS) 20 removes a noise component of a signal applied from the solid state image pickup device 10, and then samples two color signals of four color filters arranged on the CCD 10 or higher by [G +]. Outputs the first signal S1 of Cy] and the second signal S2 of [Mg + Ye], and the third signal S3 of [Mg + Cy] and the fourth of [G + Ye] in the previous line. Output the signal S4. In general, the green (G) filter does not pass the R and B components of the subject, but only the G component passes. In the Cy filter, the R component is restrained and only the B and G components pass. In addition, in the magenta (Mg) filter, the G component is restrained and only the R and B components pass. In the sulfur (Ye) filter, the G component is restrained and only the R and G components pass. Therefore, the color information extraction unit 30 extracts the signals applied from the correlation double sampling unit 20 through R, G, and B signals through known techniques. More specifically, the subtractor 32 of the color information extracting unit 30 obtains a difference component between two signals applied from the correlation double sampling unit 20. That is, it is represented as follows.

S2-S1 = (Mg + Ye)-(G + Cy)

= (R + B + R + G)-(G + B + G)

= 2R-G

= COH

S4-S3 = (G + Ye)-(Mg + Cy)

= (G + R + G)-(G + B + B + G)

= G-2B

=-(2B-G)

= C1H

The difference components obtained from the subtractor 32 are applied to the first delay unit 33 and the calculation unit 35, respectively. The first delay unit 33 delays the difference components S2-S1, that is, C _OH from the subtractor 32, to the second delay unit 34 and the multiplexer 37, respectively. The second delay unit 34 applies the delayed difference components S4-S3, that is, C _1H , which are applied from the first delay unit 33 to the operation unit 35 after delaying the predetermined time again. In other words, since R, G, and B signals are obtained from the matrix 38, 2R-G and-(SB-G) are required at the same time, so the 1H delayed C _1H signal and the 2H delayed C _2H signal are applied using the 1H delay line. Is averaged and applied to the corresponding collection of the multiplexer 37. On the other hand, through the adder 31 to obtain a composite of the two signals applied from the correlation double sampling unit 20 and outputs as a luminance signal (yi). That is, YOH, which is the luminance signal of the current input line, is S2 + S1, and Y1H, which is the luminance signal of the previous input line, is S4 + S3.

The multiplexer 37 alternately supplies, to the matrix 38, a signal that is alternately applied from the adder 35 and the first delay unit 33 every line according to a predetermined control signal ID. The luminance signal Yi output from the adder 31 is input to the matrix 38 via the third delay unit 36. The matrix 38 converts the 2R-G = C _R ,-(2B-G) = C _B signals applied from the multiplexer 37 and the luminance signal Yi applied from the third delay unit 36 into a predetermined matrix structure. Correspondingly extract the RGB signal. The luminance / color difference signal extractor 40 extracts the luminance signal Y and the color difference signals RY and BY using the RGB signal extracted from the color information extractor 30. The signal synthesizing unit 50 combines the luminance signal Y and the color difference signals RY and BY extracted from the luminance / color difference signal extracting unit 41 into a synthesizeable image signal. The A / D conversion unit 60 converts the video signal applied from the signal synthesis unit 50 into a digital form and displays it on the receiving tube of a television or, in the case of image processing using a computer, through an interface 70 through a general purpose computer. (80). The general purpose computer 80 receives an image signal to extract RGB, which is information required for image display.

As described above, in order to extract color information, a very complicated hardware configuration is required, and in the case of image processing using a computer, a separate color information extraction process has to be performed.

Accordingly, an object of the present invention is to use a general-purpose computer that greatly simplifies the system configuration by performing the process directly in a computer without using a separate color information extraction when the photographed signal is used only for image processing on a computer. In providing a method.

Another object of the present invention is to provide an apparatus for implementing an image processing method using a general-purpose computer having the above-described color information extraction process.

A feature of the present invention for achieving the above object is to use a general purpose computer to image a signal photographed by a color CCD camera having a color filter in which a plurality of color components in a constant array are arranged alternately every line. A method of converting a photographing signal into digital data and applying the same to a connected general purpose computer, calculating a difference component between two adjacent signals passing through an odd line of a color filter among the digital data, and calculating the difference as a first color component signal. And calculating a difference component between two adjacent signals passing through the even lines of the color filter among the digital data and calculating the difference components as a second color component signal, and two adjacent signals passing through the odd line of the color filter among the digital data. Calculating a composite component of the luminance component signal and calculating it as a luminance component signal; and from the luminance component signal, the first color component signal, and the second color component time signal, , In the step of calculating the third color signal blue.

A feature of the present invention for achieving another object of the present invention is an apparatus for image processing a signal photographed through a color CCD camera having a color filter in which a plurality of color components of a constant array alternately arranged every line, Means for converting a photographed signal into a digital form and applying it to a connected general purpose computer; means for generating a difference component between two adjacent signals passing through an odd line of a color filter among the input digital data as a first color component signal; Means for generating a difference component between two indirect signals passing through the even lines of the color filter among the input digital data as a second color subsignal signal, and two indenting passes through the odd line of the color filter among the input digital data. Means for generating a synthesized signal as a luminance component signal, and a number for obtaining pure color signals by adding and subtracting the first color component signal, the second color component signal, and the luminance component signal to each other; The stage is provided.

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

3 is a block diagram showing an image processing apparatus using a general-purpose computer according to the present invention. An image processing apparatus using a general-purpose computer of the present invention includes a solid state image pickup device (CCD) 10 and a correlated double sampling unit 20 for removing noise of a signal from the CCD 10. An A / D converter 60 for converting an analog signal into a digital form is connected to an output terminal of the correlation double sampling unit 20. The output terminal of the A / D conversion unit 60 is configured such that the interface 70 and the general purpose computer 80 are sequentially connected.

First, Fig. 3 is an apparatus applied to the case where a scene photographed through a photographing means such as a camcorder is used only in image processing using a computer. First, in the single-color color CCD camera, a color filter composed of Cy, G, Ye, and Mg as shown in FIG. 2 is attached on the CCD 10 to extract color information therefrom. The correlation double sampling unit 20 removes noise from the signal from the CCD 10 and immediately applies the A / D converter 60 to the signal. The A / D converter 60 converts the output signal of the CCD 10 from which noise is removed to digital data and applies it to the general purpose computer 80 connected via the interface 70. The general purpose computer 80 calculates luminance components Yi and R and B components Cr and CB by applying the data input through the interface 70 to the following equation.

Yi = S1 + S2 ..................... (1)

CR = S2-S1 ..................... (2)

CB = S4-S3 ..................... (3)

Here, S1 and S2 are signal components of the current input line, and S2 and S4 are signal components of the previous line, and S1 = Gy + G, S2 = Ye + MG, S3 = Cy + Mg, and S4 = Ye + G.

Therefore, the color information R, G, and B signals required for the image display and the graphic file format are obtained by the following equation.

R = CR + 0.12 Yi = S1-S2 + 0.12 (S1 + S2) = 1.12 S1-0.88 S2 ....... (4)

G = Yi-CR + CB = S1 + S2-(S1-S2) + (S3-S4)

= 2S2 + S3-S4 ........ (5)

B =-CB + 0.2 (Yi-CR)

=-(S3-S4) + 0.2 [S1 + S2-(S1-S2)]

= 0.4S2-S3 + S4 .......... (6)

Here, coefficients such as 0.12 and 0.2 are variable data.

The general purpose computer 80 directly receives the captured image signal, and simply extracts the necessary R, G, and B signals through the above-described equation, and stores them as a graphic file.

As described above, the present invention relates to an image processing method and a device using a general-purpose computer, and when performing image processing using a computer, a computer directly without going through a hardware configuration for extracting color information from an image signal photographed from a CCD. In addition to simplifying the hardware configuration, it is possible to improve the resolution.

Claims (7)

A method for image processing a signal taken by a color CCD camera having a color filter in which a plurality of color components in a constant array are arranged alternately every line using a general purpose computer, wherein the photographed signal is converted into digital data and connected. Applying to the general-purpose computer; Obtaining a difference component between two adjacent signals passing through the odd line of the color filter among the digital data and calculating the difference component as a first color component signal; Obtaining a difference component between two adjacent signals passing through an even line of a color filter among the digital data and calculating the difference component as a second color component signal; Calculating a heap component of two adjacent signals passing through an odd line of a color filter among the digital data and calculating the result as a luminance component signal; And calculating red, green, and blue color signals from the luminance component signal, the first color component signal, and the second color component signal. The image processing method according to claim 1, wherein the red signal (R) is calculated as in the following equation. R = C _R + αY Here, CR is the first color component signal, Y is the luminance component signal, and α is a constant constant value. The image processing method using a general-purpose computer according to claim 2, wherein the constant value α is 0.12. The image processing method according to claim 1, wherein the green signal (G) is calculated as in the following equation. G = Y-C _R + C _B Here, Y is a luminance component signal, CR is a first color component signal, and C _B is a second color component signal. 2. The image processing method according to claim 1, wherein the blue signal (B) is calculated as in the following equation. B =-C _B + (Y-C _R ) Here, C _R is the first color component signal, C _B is the second color component signal, Y is the luminance component signal, and β is a constant value. 6. The image processing method using a general-purpose computer according to claim 5, wherein said constant value (beta) is 0.2. An apparatus for processing a signal photographed by a color CCD camera having a color filter in which a plurality of color components in a constant array are alternately arranged every line, wherein the photographed signal is converted into a digital form and applied to a connected general purpose computer. Means for doing so; Means for generating, as a first color component signal, a difference component between two adjacent signals passing through an odd line of the color filter among the input digital data; Means for generating, as a second color component signal, a difference component between two adjacent signals passing through the even line of the color filter among the input digital data; Means for generating, as a luminance component signal, a composite of two adjacent signals passing through an odd line of a color filter among input digital data; And means for obtaining pure color signals by adding and subtracting the first color component signal, the second color component signal, and the luminance component signal to each other.