KR0157529B1 - Brightness/color signal separating apparatus and method using binery edge pattern - Google Patents

Abstract

[Technical field to which the invention described in the claims belong]

An apparatus and method for separating luminance / color signals from composite video signals in an image processing apparatus.

[Technical Challenges to Invent]

An object of the present invention is to provide an apparatus and method for accurately separating luminance / color signals from various types of edges having low correlation between samples.

[Summary of the solution of the invention]

It is characterized in that the filter is designed so as to separate the luminance / color signal from the filter bank according to an edge pattern.

[Important Uses of the Invention]

It is used to accurately separate luminance / color signals from various types of edges with low correlation between samples.

Description

Luminance / Color Signal Separation Apparatus and Method Using Binary Edge Pattern

1 is a block diagram of a luminance / color signal separation device using a binary edge pattern and a peripheral circuit thereof according to the present invention.

2 is a diagram illustrating an implementation of a filter and a filter coefficient selector for selecting a filter coefficient from a filter bank and calculating a filtering signal based on the binary pattern vector in FIG.

* Explanation of symbols for main parts of the drawings

100: luminance / color signal separation device 11: analog / digital converter

12, 13: Line Delay 14-19: Sample Delay

20: pattern classifier 21: filter

22: filter coefficient selector 23: band pass filter

24: color demodulator 25, AD: adder

26: RGB Converter 27: Digital / Analog Converter

28: display unit M1 to M5: multiplier

R1 to R5: ROM

The present invention relates to an apparatus and method for separating luminance / color signals from composite image signals in an image processing apparatus, and more particularly, to an apparatus and method for separating luminance / color signals from composite image signals using binary edge patterns. .

An edge component exists in a signal sampled from the composite video signal. Generally, the luminance / color signal is separated by detecting this edge component. However, among these edge components, various other types of edges, which are not simple vertical or horizontal edges, have a low correlation between samples, which serves as a major cause of poor luminance / color signal separation.

Accordingly, an object of the present invention is to provide an apparatus and method capable of accurately separating luminance / color signals from various types of edges having low correlation between samples.

The present invention for achieving the above object is characterized in that it is configured to separate the luminance / color signal by selecting a filter designed for the pattern from the filter bank according to the pattern of the edge (pattern).

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

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It will be obvious to those skilled in the art. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a configuration diagram of a luminance / color signal separation device using a binary edge pattern and a peripheral circuit thereof according to the present invention. The input signal NTSC is a composite NTSC sampled at a frequency of 14.3 MHz. Reference numerals w1 to w9 represent samples constituting a 3x3 window (W) moving sequentially in the image of the composite video signal NTSC, and can be represented by the following equation (1).

Samples w1 to w9 of the window W are made by line delay and sampling delay, as shown. That is, the second sample w2 is the second sample delay of the composite video signal NTSCNTSC, the third sample w3 is the fourth sample delay of the composite video signal NTSC, and the fourth sample w4 is the first sample of the composite video signal NTSC. The fifth sample w5 is the second sample delay after the first line delay of the composite video signal NTSC, and the sixth sample w6 is the fourth sample delay after the first line delay of the composite video signal NTSC. The seventh sample w7 is the second line delay of the composite video signal NTSC, and the eighth sample w8 is the second sample delay after the second line delay of the composite video signal NTSC, and the ninth sample w9 is the composite video signal The NTSC was delayed by the fourth sample after the second line delay. Therefore, the distance between each adjacent sample in the horizontal direction corresponds to two sampling points, and the distance between each adjacent sample in the vertical direction corresponds to one line in the interlaced image. Also, (w1, w3, w5, w7, w9) have the same color phase, (w2, w4, w6, w8) also have the same color phase and (w1, w3, w5, w7, It has a color phase opposite to that of w9). In this embodiment, the sample corresponding to the position where the luminance / color signal is to be separated is w5.

Samples in window W are applied to filter 21 and pattern classifier 20. The pattern classifier 20 classifies the edge puncture from the samples w1 to w9 in the window W and transmits the pattern information signal m to the filter selector 22-1. The filter selector 22-1 selects a filter corresponding to the pattern information signal m from the filter bank 22-2 and transfers the corresponding filter coefficients Am, Bm, Cm, Dm, and Em to the filter 21. The output of the filter 21 (hereinafter referred to as the filtering signal f) according to the filter coefficients Am, Bm, Cm, Dm, and Em may be represented by the following equation (2).

In this case, the filtering signal f may be a luminance or color signal, which is determined by whether the corresponding output signal is a luminance signal or a color signal when designing the coefficients of the filter in the filter bank. It is very well known that it can be designed adaptively and many adaptive algorithms for optimization are described in Adaptive Signal Processing, S. Haykin, 2nd Ed., Prentice Hall Inc. Introduced in Englewood Cliffs, New Jersey, 1991-. Representative examples include a Least Mean Square (LMS) algorithm and a Recursive Least Square (RLS) algorithm. In the present embodiment, only the case where the output signal f of the output signal 21 of the filter 21 corresponds to the color is illustrated and shown in FIG.

Prior to describing the pattern classification operation for classifying the edge patterns in detail, the following definitions are made.

The binary pattern vector 'm = (b1, b2, b3, b4, b5, b6)' is defined as follows.

b1 = S (w4, w6, Th)

b2 = S (w2, w8, Tv)

b3 = S (w1, w5, Td)

b4 = S (w3, w5, Td)

b5 = S (w7, w5, Td)

b6 = S (w9, w5, Td)

Where Th, Tv and Td are preset constants. The six binary numbers represent the presence or absence of edges in the horizontal, vertical, top left, top right, bottom left and bottom right directions, respectively. For example, 'b3 = 1' means that there is an edge in a given window in the upper left direction. Therefore, 'm = (0, 1, 0, 1, 0, 0)' indicates that edges exist in the window W in the vertical and upper left directions, respectively. When the edge patterns in the window W are classified by the method described above and the information is contained in m and transmitted to the filter selector 22-1, it is easy to see that the types of edge patterns are 2 ⁵ , that is, 64. , 0, 0, 0, 0, 0) to (1, 1, 1, 1, 1, 1).

2 illustrates an embodiment of a filter and a filter coefficient selector for selecting a filter coefficient from a filter bank and calculating a filtering signal f based on the binary pattern vector m in FIG. The filter coefficient selector 22 is composed of five ROMs. These five ROMs correspond to the filter banks in the first half, with the weight of w2 of the coefficients of the 64 filters in the first ROM, the weight of w4 of the coefficients of the 64 filters in the second ROM, and the 64 in the third ROM. The weight of w5 among the coefficients of the filters is stored in the same order as the weight of w6 among the coefficients of the 64 filters in the fourth ROM and the weight of w8 among the coefficients of the 64 filters in the fifth ROM. And these five ROMs are commonly addressed by m. When m is applied to each ROM, values Am, Bm, Cm, Dm, and Em corresponding to the address m are output from each ROM table. These values are each applied to a multiplier to output a filtering f which is expressed as shown in equation (2) above. The coefficients Am, Bm, Cm, Dm, and Em used at this time correspond to one of 64 filters.

Referring back to FIG. 1, when the filtering signal f in FIG. 2 is referred to as a separated color signal, that is, a first color signal, the band pass filter BRF 24 filters only a predetermined band of the first color signal again. To output the second color signal. The adder 25 outputs the Y signal by subtracting the second color signal from the fifth sample determined as the separation position. The color demodulator 24 demodulates the second color signal and outputs R-Y and B-Y signals. The RGB converter 26 converts the Y, R-Y and B-Y signals into R, G and B signals. Digital / analog converter 27 converts the digital R, G, and B signals into analog form. The display unit 28 displays the R, G, and B signals converted into the analog form on the screen.

As described above, the present invention selects a filter designed according to the pattern from the filter bank according to the edge pattern and separates the luminance / color signal so that the luminance / color can be obtained from various types of edges having low correlation between samples. The advantage is that the signal can be separated accurately.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (12)

1. An apparatus for separating luminance / color signals from a composite video signal sampled at a predetermined frequency, comprising: means for generating a 3x3 window by predetermined line delay and sampling delay of the composite video signal; Means for classifying edge patterns from samples of the window having a first or opposite second phase and outputting binary pattern information signals according to the existence of edges in vertical, horizontal and diagonal directions, and storing a plurality of filter coefficients Means for selecting and outputting a corresponding filter coefficient from the filter bank according to the pattern information signal, and a remaining sample having a phase opposite to the sample determined as the separation position and the sample determined as the separation position from the window. And means for performing filtering on the sample determined as the separation position according to the selected filter coefficients. 2. The luminance / color signal separation device of claim 1, wherein the binary pattern information signal is a binary pattern vector consisting of six binary numbers representing edges in the horizontal, vertical, upper left, upper right, lower left, and lower right directions, respectively. . The apparatus of claim 1, wherein the filtered signal is determined as a luminance or a color signal according to filter coefficients stored in the filter bank. The method according to any one of claims 1 to 3, wherein the means for performing filtering comprises: first-agent corresponding to remaining samples having phases opposite to the sample determined to be separated and the sample determined to be separated; And a filtering signal added to the first to fifth multipliers multiplying the five filter coefficients and an output of the first to fifth multipliers. A device for separating luminance / color signals from a composite video signal sampled at a predetermined frequency, the apparatus comprising: a third sample of a second sample delay of the composite video signal, a third sample of a fourth sample delay of the composite video signal; A fourth sample having a primary line delayed composite signal, a seventh sample having a second delayed composite video signal, a fifth sample having a second sample delayed delayed first composite line signal, and a composite video signal Sixth sample with fourth-order delay after primary line delay, Eighth sample with second-delay sample after second-line delay, Fourth sample with fourth-delay sample after second-line delay Means for generating a 3x3 window of samples, means for classifying an edge pattern from each sample of the window and outputting a binary pattern vector according to the presence or absence of an edge; Means for selecting and outputting a corresponding filter coefficient from the filter bank according to the binary pattern vector, the filter bank storing a plurality of filter coefficients as a weight of each sample, and a sample determined as a separation position from the window and the separation And a means for inputting the remaining samples having a phase opposite to the sample determined as the position, and performing filtering on the sample determined as the separation position according to the selected filter coefficient. The luminance / color signal separation method of claim 5, wherein the distance between adjacent samples in the horizontal direction corresponds to two sampling points and the distance between adjacent samples in the vertical direction corresponds to one line in the interlaced image. Device. 7. A method according to any one of claims 5 and 6, wherein the means for performing filtering comprises: first to first corresponding to samples determined to be separated and remaining samples having phases opposite to the samples determined to be separated; And an adder configured to add a first multiplier that multiplies a filter coefficient by five and an adder that adds an output of the first multiplier and outputs a filtering signal. 6. The luminance / color signal separation device of claim 5, wherein the binary pattern vector is composed of six binary numbers each representing the presence or absence of edges in a horizontal, vertical, top left, top right, bottom left and bottom right directions. The apparatus of claim 5, wherein the filtered signal is determined as a luminance or a color signal according to filter coefficients stored in the filter bank. Means for converting Y, RY and BY into R, G and B signals, means for converting the R, G and B signals into an analog form, and R, G and B signals converted into the analog form on a screen An image processing apparatus comprising: a second sample delayed by a second sample of a composite video signal sampled at a predetermined frequency; a third sample delayed by a fourth sample of the composite video signal; Fourth sample with delayed second line, Seventh sample with second line delayed with composite video signal, Fiveth sample with second sample delayed after first line delay with composite video signal, Primary line delayed with composite video signal A fourth sample delayed by the fourth sample, an eighth sample delayed by the second sample after the second line delay, and a ninth sample delayed by the fourth sample after the second line delay by the second video delay Means for generating a 3x3 window and an edge pattern divided from each sample of the window. Means for outputting a pattern vector consisting of six binary numbers according to the presence or absence of edges in the horizontal, vertical, upper left, upper right, lower left and right directions, and a filter for storing a plurality of filter coefficients as weights of the respective samples. Means for selecting and outputting a corresponding filter coefficient from the filter bank according to the pattern vector, and having a phase different from the second, fourth, sixth, and eighth samples having the same phase from the window. Means for inputting 5 samples, filtering the fifth sample according to the selected filter coefficients to output a first color signal, and a band for filtering only a predetermined band of the first color signal and outputting a second color signal Means for outputting a Y signal by subtracting the second color signal to a sample determined as the separation position, and means for outputting the RY and BY signals by demodulating the second color signal. A luminance / color signal separation device, characterized by configured. The luminance / color signal separation method of claim 10, wherein the distance between adjacent samples in the horizontal direction corresponds to two sampling points and the distance between adjacent samples in the vertical direction corresponds to one line in the interlaced image. Device. 12. The apparatus of any one of claims 10 or 11, wherein the weights of the second, fourth, sixth, and eighth samples having the first phase in the window and the weights of the fifth samples having the second phase are respectively determined. An adder that adds outputs of the first to fifth multipliers and the first to fifth multipliers to multiply corresponding first, second, fourth, fifth and third filter coefficients and outputs a first color signal. Luminance / color signal separation device characterized in that configured.