KR100228703B1 - Vertical compression method of screen and its apparatus - Google Patents

Abstract

Disclosed is a screen vertical compression method and apparatus for allowing a user to select a wider vertical compression ratio of a desired screen by varying a range of vertical compression modes for a screen in a television receiver.

The present invention provides a method for determining a compression mode, a scanning method, a priority of a field with respect to the scanning method, and a scanning line value obtained by counting the number of compression lines with respect to the field; Generating a pair of first and second coefficient determination data having at least 4 bits to extract and represent representative image data by calculating and combining the image data corresponding to the scanning lines of the first and second fields for the determined compression mode. step; The transfer function coefficient of the filter set is calculated and combined with the image data of a predetermined adjacent scan line among the several scan lines input according to the generated pair of first and second coefficient determination data. Extracting image data corresponding to one representative scan line; And compressing the screen size in at least six modes including a bypass by recording image data of a representative scan line for one frame extracted corresponding to the vertical compression mode.

Therefore, in the screen vertical compression method of the present invention, by combining the individual digital filters according to the vertical compression mode into one block, it is possible to provide a more various vertical compression mode without increasing the number of taps of the filter.

Description

Screen vertical compression method and apparatus.

The present invention relates to screen vertical compression that can compress the aspect ratio of a video signal in a vertical direction in a television receiver. More specifically, the aspect ratio of the vertical direction is considered in consideration of the fact that the television broadcast signal processing is an interlace. The present invention relates to a method and apparatus for vertically compressing a screen, which compresses in more various modes and selects various compression ratios in the vertical direction to be viewed.

In general, in letter broadcasting (NTSC system) and arm broadcasting (PAL system), the letter box type is 3/4 of the original active video section (effective video section) as a low-frequency image, the top and bottom or left and right of the screen The black side, that is, the image is transmitted in the form of letterbox.

This is to transmit an image having a 16: 9 aspect ratio such as a movie without distortion of the screen in a television receiver having an aspect ratio of 4: 3.

However, the development of a wide screen television receiver having an aspect ratio of 16: 9 has led to the necessity of compressing or extending the 4: 3 broadcasting system and the 16: 9 broadcasting system on all screens of the wide television receiver.

Therefore, in accordance with the spread of wide television receivers, each broadcasting station mixes 4: 3 programs and 16: 9 programs to revolve between television receivers with 4: 3 aspect ratio and wide television receivers with 16: 9 aspect ratio. Is increasing.

In addition, the receiving side detects a wide screen signal (WSS) indicating whether a program transmitted from a broadcasting station is a 4: 3 program or a 16: 9 program, and automatically expands or compresses the screen of the wide television receiver. Necessity has arisen.

However, it should be noted that in order to receive and watch a 4: 3 program transmitted from a broadcasting station with a 16: 9 wide television receiver, it is only possible to view it by vertically compressing the scanning player on the screen.

As described above, in order to satisfy a consumer's satisfaction in a wide television receiver having an aspect ratio of 16: 9, it is necessary to change the aspect ratio through various vertical compression modes instead of one mode.

However, if the various vertical compression modes are provided to satisfy the customer's satisfaction, the hardware becomes very complicated, which results in a contradiction against low cost, high efficiency production and compactness of the product. .

An apparatus for converting the aspect ratio by compressing the scanning player in such a wide television receiver having a general 16: 9 aspect ratio in the vertical direction includes the apparatus as shown in FIG.

The apparatus shown in Fig. 1 will be described as an example of a screen vertical compression apparatus of a conventional television receiver.

The screen vertical compression apparatus may include a clock generator configured to generate a first clock CLK1 due to the vertical synchronization signal VS input through the synchronization input terminal 313 to compress the scanning player of the screen in a vertical direction ( 303, a first multiplication unit 304 for generating a second clock CLK2 by multiplying the first clock CLK1 generated and generated by the clock generator 303, and the first clock obtained above. The second multiplier 305 which multiplies CLK1 by 7/8 to generate a third clock CLK3 and the first clock CLK1 obtained by the clock generator 303 are counted and outputted to a set value. By comparing the clock coefficient unit 306 and the clock coefficient value obtained from the clock coefficient unit 306 with a set value, the removed image section is determined on the screen having an aspect ratio of 16: 9, and the first clock selection control signal S1 according thereto is determined. ) And the record enable signal (WE) are generated to remove the upper and lower screens from the 16: 9 screen, and display the compressed video signal. By comparing the coefficient value and the set value of the first image section determination unit 307 and the clock coefficient unit 306 to determine the effective image section and the vertical retrace section, and accordingly the second clock selection control signal (S2) And a second image section discriminating unit 308 for outputting an upper and lower panel selection control signal SP to vertically compress the screen, and detecting a rising edge of the vertical synchronization VS input from the synchronization input terminal 313. Each time the rising edge is detected, the edge detection unit 302 generates a reset signal RST and the first clock selection control signal S1 generated by the first image section determination unit 307 is used. A first clock selector 309 for selecting and outputting any one clock of the first clock CLK1 of the clock generator 303 and the second clock CLK2 multiplied by the first multiplier 304; The image is switched according to the second clock selection control signal S2 generated by the second image section determination unit 308. The second clock selector 310 which selects and outputs one of the clocks selected by the third clock CLK3 multiplied by 7/8 in the second multiplier 305 and the clock selected by the first clock selector 309. The first clock CLK1 obtained from the clock generator 303 is input as a recording clock according to the recording enable signal WE generated by the first image section determination unit 307. Receives the clock selected in step 309 as a read clock, compresses and stores digital image data input in line units through the image input terminal 312 for each field, and resets the reset signal generated by the edge detector 302. The first field memory unit 300, which is reset by the RST) and records / reads image data of the next field, and any one of the clocks selected by the first clock selector 309 is input to the recording clock. Any one obtained by being selected by the second clock selector 310 Receives a clock as a read clock and records / reads image data input in line units from the first field memory unit 300 for each field, and resets it by the reset signal RST generated by the edge detector 302. The second field memory unit 301 for recording / reading the image data of the next field and the image data input for every field in the second field memory unit 301, and the luminance level value of any upper and lower panels is set to the second field memory unit 301. The upper and lower panel inserting units 311 are inserted in accordance with the upper and lower panel selection control signals SP of the two image section determining unit 308 and output the digital image data compressed in the vertical direction through the output terminal 314.

In addition, FIG. 2 illustrates a state in which a screen is compressed into a plurality of modes, for example, 4/5, 2/3, 1/2, and 1/3 by a screen vertical compression device of FIG. 1 in a screen having an aspect ratio of 16: 9. It is shown.

The screen vertical compression apparatus of the conventional television receiver configured as described above will be described in more detail with reference to FIG. 2 as follows.

First, when the vertical synchronization VS is input through the synchronization input terminal 313, the clock generator 303 firstly inputs each time the vertical synchronization VS is input in order to compress the input digital image data in the vertical direction. The clock CLK1 is generated and provided to the first and second multipliers 304 and 305, the clock coefficient unit 306, the first field memory unit 300, and the first clock selector 309.

The first multiplier 304 multiplies the first clock CLK1 input from the clock generator 303 by two to make the second clock CLK2 to the first clock selector 309 to be described later. Will be provided.

The second multiplier 305 multiplies the first clock CLK1 input from the clock generator 303 by 7/8, and then uses the second clock selector 310 as the third clock CLK3. ).

In addition, the clock counting unit 306 counts the start of the first clock CLK1 input from the clock generator 303 for each field, and counts the count value of the first image section discriminating unit 307 and the first unit. It is provided to the two image section discriminating unit 308.

The first image section discriminating unit 307 compares the value obtained by counting by the clock counting unit 306 with a setting value, and when the screen compression mode is 5: 4, the first clock is not removed. The selection control signal S1 is provided to the first clock selection unit 309 and the write enable signal WE is provided to the first field memory unit 300.

The second image section determination unit 308 distinguishes the vertical retrace section and the effective image section by comparing a result value and a setting value of the coefficient input from the clock coefficient section 306.

This is because, when reading the video signal stored in the second field memory unit 301 which will be described later, the clock speed should be differently divided into a section to be compressed and a section not to be compressed during one vertical scanning period. .

In other words, the section that should not be compressed is the vertical regression section and should not be compressed because this section has vertical synchronization.

As described above, the second image section determination unit 308 compares the count result value and the set value of the first clock CLK1 obtained by counting the clock counting unit 306 with the vertical retrace section as described above. The second clock selection control signal S2 is provided to the second clock selection unit 310 and the upper and lower sides are divided into image sections to change the read clock speed of the second field memory unit 301 according to the divided result. The panel selection control signal SP is generated and provided to the upper and lower panel insertion units 311.

The first clock selector 309 is switched by a first clock selection control signal S1 input from the first image section determination unit 307 to be switched by the first clock unit 304. The second clock CLK2 multiplied by the CLK1 is blocked and the first clock CLK1 generated by the clock generator 303 is selected to select the first and second field memory units 300 and 301. The second clock selector 310 is provided.

In addition, the second clock selection unit 310 is switched by the second clock selection control signal S2 input from the second image section determination unit 308 so that the first clock in the second multiplication unit 305 is switched. The second field memory unit 301 alternately selects the third clock CLK3 multiplied by 7/8 with respect to the CLK1 and the first clock CLK1 obtained by being selected by the first clock selector 309. To be provided.

In this case, when the digital image data is input in line units through the image input terminal 312, the first field memory unit 300 is connected to the write enable signal WE input from the first image section determination unit 307. Is enabled by the clock generator 303 and receives the first clock CLK1 as a recording clock and stores digital image data in line units input through the image input terminal 312 in every field unit. In addition, the first clock CLK1 selected and input by the first clock selector 309, that is, the recording clock of the first field memory unit 300 is input as a read clock and stored therein. Each line is output and provided to the second field memory unit 301.

As a result, in the first field memory section 300, writing and reading from the first clock CLK1 input from the clock generation section 303 are delayed by one simple vertical scanning period, and there is no signal change.

The reset signal RST of the edge detector 302 which detects the rising edge of the vertical synchronization VS input through the synchronization input terminal 313 and generates the reset signal RST at each time is generated. The one field memory unit 300 is initialized and records and reads image data of the next field in the same manner as described above.

On the other hand, the second field memory unit 301 is a read clock of the first field memory unit 300, which is selected by the first clock selector 309, that is, the first clock CLK1 as a write clock. The first clock CLK1 and the first clock which are inputted and recorded by the first field memory unit 300 record the image data in field units, and are alternately selected by the second clock selector 310. The third clock CLK3 multiplied by 7/8 with respect to the CLK1 is input to the read clock, and the previously stored image data is first-in-first-out for each vertical scan line and provided to the upper and lower panel inserting units 311.

It should be noted that the image data of the second field memory unit 301 is compressed in the vertical direction by the clock selected by the second clock selector 310.

In other words, unlike the time of recording, the second clock selection unit 310 first controls the second clock selection of the second image section determination unit 308 in order to read the image data of the second field memory unit 301. When the signal S2 indicates the vertical retrace period, as described above, the clock used as the first clock CLK1 selected by the first clock selector 309, that is, the write clock of the first field memory unit 300, is used. By selecting and reading the image data stored in the second field memory unit 301 as it is, there is no change of the image data.

However, when the second clock selection control signal S2 of the second video segment determination unit 308 indicates an effective video segment, the first clock CLK1 is multiplied by 7/8 through the second multiplier 305. By selecting the third clock CLK3 and reading the image data stored in the second line memory unit 301 in a first-in first-out manner, as shown in FIG. 2, the aspect ratio is increased in a screen having an effective aspect ratio of 16: 9. Is compressed vertically by 4/5.

And, as shown in FIG. 2, the upper and lower panels are inserted into the lower part of the screen having the aspect ratio of 16: 9 except for the effective image section of 5: 4, that is, the lower part of the video signal vertically compressed to 4/5. In order to pass through the upper and lower panel inserting unit 311, the luminance level value " 0 " is inserted into the lower panel position by the upper and lower panel selection control signals SP generated by the second image section discriminating unit 308. do.

In other words, when the upper and lower panel selection control signals SP, which are obtained by being divided by the second image section discriminating unit 308, indicate the effective video section, the upper and lower panel inserting units 311 of the second field memory section 301 When the image data is selected and output through the output terminal 314, and the upper and lower panel selection control signal SP does not indicate the effective video section, the luminance level value of the ground potential is selected and inserted into one of the effective video sections, and the output terminal ( 314), the result is a vertically compressed screen having an aspect ratio of 5: 4 on an original screen having an aspect ratio of 16: 9 as shown in FIG.

When the screen compression mode is 1/2, the first clock selector 309 is driven by the clock generator 303 by the first clock select control signal S1 of the first video section discriminator 307. The generated first clock CLK1 is blocked and the first multiplier 304 selects the second clock CLK2 multiplied by the first clock CLK1 to first and second field memory units 300. 301 and the second clock selector 310.

The first field memory unit 300 records the digital image data by the first clock CLK1 of the clock generator 303 and the second field CLK2 selected by the first clock selector 309. The stored data is provided to the second field memory unit 301.

The second field memory unit 301 is a read clock of the first field memory unit 300 selected by the first clock selector 309, that is, a second clock CLK2 that is doubled through the first multiplier 304. Recording the input image data on a field basis, and also by the second clock selection control signal S2 of the second video section determination unit 308. By reading the second clock (CLK2) and the third clock (CLK3) obtained alternately as a read clock to read the stored image data, as a result, as shown in Fig. 2, the effective video section has a 16: 9 aspect ratio On the screen having the aspect ratio, the screen is vertically compressed with an aspect ratio of 2: 1.

In this way, the video signal is compressed in the vertical direction in the remaining vertical compression modes, that is, 2/3 and 1/3.

However, the technique of the conventional screen vertical compression apparatus described above is, as is well known, a method of vertically compressing a scanning player in time, which is a compression of a clock used in a memory unit by using a clock circuit without using a digital filter. It can be seen that the ratio will be different.

That is, since the first and second multipliers do not multiply the clock ratio according to the vertical compression mode according to the vertical compression mode, the compression ratio of the field memory unit is changed. It can be seen that the unsafe operation.

Therefore, whenever the compression ratio of the clock is different, a clock having a speed corresponding thereto is required. In order to generate the clock, the control of the clock circuits, that is, the first and second multiplication units, the clock coefficient unit, and the clock generator, is quite difficult. It is a problem.

In addition, as one method of avoiding controllability of the clock circuit, it is conceivable to eliminate the clock circuit and use respective compression filter circuits according to the vertical compression mode. Depending on the definition, the circuits that make up the filter need to be quite complicated.

Therefore, in order to prevent the difficulty and complexity of control over the clock circuit, it is difficult to determine the transfer function of the compression filter, and the number of taps of the filter circuit for each vertical compression mode is increased. This is also undesirable.

Accordingly, it is desirable to provide a vertical screen compression device that provides a user with a variety of compressed screens equal to or larger than the conventional one without increasing the number of taps of the filter circuit for the vertical compression mode, so that the user can select and view a more variously compressed screen.

Accordingly, the present invention excludes an increase in the number of taps for the filter circuit of the screen vertical compression device and a difficult method of controlling and compressing the clock circuit in the conventional technology described above. It is an object of the present invention to provide a method and apparatus for vertically compressing a screen that allows a user to select a desired vertical compression ratio of a screen by varying a range of vertical compression modes.

Another aspect of the present invention is to optimize the size of the vertical compression apparatus by separately filtering the first field and the second field during compression in consideration of the fact that the television video signal processing is a progressive scan.

In still another aspect of the present invention, an object of the present invention is to enable a progressive scan process as well as a progressive scan with one filter circuit in the vertical compression mode.

As another aspect of the present invention, the object is to reduce the number of taps of the filter circuit by synthesizing the individual filters according to each vertical compression mode into one block.

1 is a configuration diagram showing a screen vertical compression device of a conventional television receiver.

2 is an exemplary view illustrating a change state of an aspect ratio according to the vertical compression mode of FIG. 1.

Figure 3 is an embodiment block diagram provided in the description of the screen vertical compression device of the present invention.

FIG. 4 is a diagram illustrating the first and second line interpolators, the digital integrator, and the line synthesizer of FIG. 3 in more detail.

5A to 5C are views illustrating a look-up table of the filter coefficient determiner and the filter coefficient selector according to the vertical compression mode of FIG. 3.

FIG. 6 is an explanatory diagram illustrating a line filtering state according to the vertical compression mode of FIG. 3.

6A is a diagram illustrating a line filtering state in the vertical filter bypass mode;

6B is a diagram illustrating line filtering states in a 4/5 vertical compression mode.

6C is a diagram illustrating line filtering in 2/3 vertical compression mode;

6D is a diagram illustrating a line filtering state in a 1/2 vertical compression mode.

6E illustrates a line filtering state in 1/3 vertical compression mode;

6F is a diagram illustrating a line filtering state in a quarter vertical compression mode.

<Description of the symbols for the main parts of the drawings>

200: filter coefficient determiner 201: filter coefficient selector

202: line delay unit 203: first line interpolator unit

204: second line interpolation unit 205: data storage unit

206: line synthesis unit 207: logical multiplication device

210: digital integrator

According to an aspect of the present invention, there is provided a method of vertically compressing a screen, the method comprising: determining a vertical compression mode and a priority and a scanning method of a field for one frame; Determining a transfer function coefficient value of the filter by counting a scan line for one field due to the priority according to the determined vertical compression mode; Calculating and combining the determined transfer function coefficient values into a predetermined adjacent scan line corresponding to the count line among a plurality of input scan lines, and extracting a scan line representative for each field; And vertically compressing the extracted scan line corresponding to the vertical compression mode in at least six modes including a bypass.

In the screen vertical compression method according to the present invention, the transfer function coefficient value determination is performed by counting the transfer function coefficient value corresponding to the scan line value obtained by counting the number of fields for one frame in compression units. It is desirable to decide.

In the vertical screen compression method according to the present invention, the scanning line extracting step corresponds to each of a plurality of adjacent adjacent scanning lines including the first line counted in one field according to the compression ratio with respect to the screen aspect ratio. It is desirable to multiply the transfer function coefficient values to select one scan line representative from their combination.

In the vertical screen compression method according to the present invention, it is preferable that the predetermined adjacent scanning line is at least two lines before and after including the first line for one field.

According to another aspect of the present invention, there is provided a screen vertical compression method according to another aspect of the present invention, a scanning line obtained by counting a compression unit with respect to a compression mode, a scanning method, a field priority for the scanning method, and the field. Determining values; Generating a pair of first and second coefficient determination data having at least 4 bits to extract and represent representative image data by calculating and combining the image data corresponding to the scanning lines of the first and second fields for the determined compression mode. step; The coefficient of the filter set is calculated and combined with the image data of the predetermined adjacent scanning line among the several scanning lines inputted according to the pair of generated first and second coefficient determination data. Extracting one image data; And recording the image data of the representative scan line for one frame extracted corresponding to the vertical compression mode and compressing the image data into at least six modes including a bypass.

In the vertical screen compression method according to the present invention, the scanning method includes an annular scanning method and a forward scanning method, and the predetermined adjacent scanning lines in the progressive scanning method and the forward scanning method are determined according to the compression mode. It is desirable to have at least two scanning lines before and after including the first line for one field.

According to another aspect of the present invention for achieving the above object, a vertical screen compression apparatus, receives a compression mode and a scanning method, the priority of the field for the scanning method and the scan line values obtained by counting the fields A pair of first and second coefficient determination data having at least 4 bits for calculating and combining the image data corresponding to the count scanning lines of the first and second fields for the input compression mode and extracting the representative image data; Filter coefficient determination means for generating first and second coefficient control signals having one bit; A pair of first and second having at least 5 bits for selecting a coefficient value corresponding to the scan line according to the first and second coefficient determination data and the first and second coefficient control signals obtained by the filter coefficient determination means; Filter coefficient selecting means for generating first coefficient coefficient information having at least one bit and a second coefficient selection signal; Line delay means for delaying the input image data in line units; Transfer of a filter set differently to image data of a predetermined adjacent scan line corresponding to the count line among the image data obtained by the line delay means according to the first and second coefficient selection signals obtained by the filter coefficient selection means. First and second line interpolation means for calculating and combining the function coefficients to extract one representative image data respectively; A digital for synthesizing, delaying and storing the image data of the first line interpolation means and the previous image data fed back according to the first coefficient information obtained by the filter coefficient selecting means, and feeding back this value as previous data. Integrating means; And line synthesizing means for calculating and outputting the image data obtained by the digital integrating means and the image data obtained by the second line interpolation means.

In the screen vertical compression apparatus according to the present invention, the digital integrating means comprises: an AND function for performing an AND operation on the first coefficient information obtained by the filter coefficient selecting means and the previous image data obtained by feeding back; An adder for synthesizing the output data of the AND product and the image data obtained by combining the first line interpolation means; A delay element for delaying the image data obtained by the adder on a line basis; A line memory for storing image data delayed by the delay element in line units; And another delay element which delays the image data of the line memory line by line and provides the previous data to the logical multiplication element and the line synthesizing means.

In this way, in the filter coefficient determination means of the screen vertical compression apparatus, four bits are stored in advance by the compression mode, the scanning method, the priority of the fields for the scanning method, and the line values that are counted for the fields. A pair of first and second generating first and second coefficient determination data of 1 and first and second coefficient control signals of 1 bit, and the filter coefficient selecting means having 5 bits for selecting the transfer function coefficient of the actual filter. As a result of generating the coefficient selection signal, as a result, each of the image data inputted line by line by the first and second coefficient selection signals obtained by the filter coefficient selection means from the first and second line interpolation means, respectively, includes a bypass. By compressing vertically into 4/5, 2/3, 1/2, 1/3, 1/4, and selecting and outputting any one of the compressed image data, the viewer can select the desired compression ratio in the vertical direction. City Hall That can be seen.

As a result, the increase in the number of taps for the filter circuit of the screen vertical compression device and the difficult method of controlling and compressing the clock circuit are eliminated, and the vertical compression is also performed in consideration of the first field and the second field for one frame. By doing so, the size of the vertical compression device is minimized, as well as the advantage that the range of the vertical compression mode is more diversified.

And, there may be a plurality of embodiments of the present invention, the following will be described in detail with respect to the most preferred embodiment.

This preferred embodiment makes it possible to better understand the objects and advantages of the present invention.

Hereinafter, exemplary embodiments of a screen vertical compression apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an embodiment block diagram provided in the description of the screen vertical compression device of the present invention.

), 그 주사방식에 대한 1비트의 필드 우선순위 데이터(

) 및 그 필드분에 대해 카운트되어 입력되는 3비트의 주사라인 카운트 데이터(LCNT)에 따라 상기 첫 번째, 두 번째 필드의 카운트 주사라인에 대응하는 영상데이터를 연산·조합하여 대표 영상데이터를 추출하기 위해 기 저장되어 있는 4비트를 갖는 한쌍의 제 1,제 2계수결정 데이터(KM),(KO)와 1비트를 갖는 제 1,제 2계수제어신호(SM),(WL)를 발생하는 필터계수 결정부(200)와, 상기 필터계수 결정부(200)에서 입력되는 제 1,제 2계수제어신호(SM),(WL)를 계수정보신호로 하여 출력단자(209)를 통해 상기 콘트롤러로 바이패스시키고 상기 4비트의 제 1,제 2계수결정 데이터(KM),(KO)에 따라 상기 카운트 주사라인에 대응하는 계수값을 선택하기 위해 기 저장되어 있는 5비트를 갖는 한 쌍의 제 1,제 2계수선택신호(SKM),(SKO)를 발생하는 필터계수 선택부(201)와, 영상입력단자(208)를 통해 입력되는 영상데이터를 라인단위로 지연·출력하는 라인지연부(202)와, 상기 필터계수 선택부(201)에서 입력되는 5비트의 제 1계수선택신호(SKM)에 따라 상기 라인지연부(202)에서 라인지연되어 입력되는 영상데이터를 서로 다르게 설정되어 있는 전달함수 계수값으로 연산하고 그 연산된 영상데이터들중 상기 카운트 주사라인에 대응하는 소정개의 인접 주사라인의 영상데이터를 조합하여 각각 대표되는 하나의 영상데이터를 선택하는 제 1라인보간부(203)와, 상기 필터계수 선택부(201)에서 입력되는 1비트의 제 1계수정보신호(SM) 및 외부의 콘트롤러로부터의 입력단자(211)를 통해 입력되는 전달함수 계수시작신호에 따라 상기 제 1라인보간부(203)에서 입력되는 11비트의 영상데이터와 피드백되어 입력되는 11비트의 이전 영상데이터를 라인단위로 합성·저장하여 출력하고 이 저장된 영상데이터를 이전의 영상데이터로 피드백 입력시키는 디지털 적분부(210)와, 상기 필터계수 선택부(201)에서 입력되는 5비트의 제 2계수선택신호(SKO)에 따라 상기 라인지연부(202)에서 지연되어 입력되는 라인단위의 영상데이터를 서로 다르게 설정되어 있는 전달함수 계수값으로 연산하고 그 연산된 영상데이터들중 상기 카운트 주사라인에 대응하는 소정개의 인접 주사라인의 영상데이터를 조합하여 대표되는 하나의 영상데이터를 선택하는 제 2라인보간부(204)와, 상기 제 2라인보간부(204)에서 입력되는 11의 영상데이터와 상기 디지털 적분부(210)에서 입력되는 11비트의 영상데이터를 조합·연산하여 데이터출력단자(212)를통해 이후의 라인메모리에 제공하는 라인합성부(206)로 구성한다.The screen vertical compression apparatus according to the present embodiment includes three bits of vertical compression mode data (VDM) input from an external microprocessor (not shown) and one bit of progressive or progressive scan mode data input from an external controller. (

), 1-bit field priority data for the scanning method (

And extracting the representative image data by calculating and combining the image data corresponding to the count scan lines of the first and second fields according to the three-bit scanning line count data (LCNT) counted and inputted for the field. Filters for generating a pair of first and second coefficient determination data KM and KO having 4 bits previously stored, and the first and second coefficient control signals SM and WL having 1 bit. The coefficient determiner 200 and the first and second coefficient control signals SM and WL input from the filter coefficient determiner 200 are counted information signals to the controller through the output terminal 209. A pair of first having 5 bits previously stored for bypassing and selecting a coefficient value corresponding to the count scan line according to the 4 bit first and second coefficient determination data KM, KO Filter coefficient selection unit 201 for generating second coefficient selection signals SKM and SKO, and image input terminal 208; A line delay unit 202 for delaying and outputting image data input through the line unit and line delay unit according to a 5-bit first coefficient selection signal SKM inputted from the filter coefficient selector 201. In operation 202, the image data input by the line delay is calculated using a transfer function coefficient value set differently, and the image data of a predetermined adjacent scan line corresponding to the count scan line is combined among the calculated image data, respectively. A first line interpolator 203 for selecting one representative image data, a first coefficient information signal SM input from the filter coefficient selector 201, and an input terminal from an external controller The 11-bit image data inputted from the first line interpolator 203 and the 11-bit previous image data inputted by the first line interpolation unit 203 according to the transfer function coefficient start signal inputted through 211 are added in line units. According to the digital integrating unit 210 for storing and outputting and feeding back the stored image data to the previous image data, and according to the 5-bit second coefficient selection signal SKO input from the filter coefficient selecting unit 201. The line delay unit 202 calculates the line unit image data that is delayed and inputted using a transfer function coefficient value that is set differently, and among the calculated image data of the predetermined adjacent scan line corresponding to the count scan line. A second line interpolation unit 204 for selecting one representative image data by combining the image data, 11 image data input from the second line interpolation unit 204, and an input from the digital integrator 210 And a line synthesizer 206 which combines and computes 11-bit video data to be provided to a subsequent line memory through the data output terminal 212.

In FIG. 4, the first line interpolator 203 includes first to third multipliers 10 to 12 in which image values input from the line delay unit 202 are different from each other. The first line multiplier 203a is multiplied by the first line multiplier 203a and outputs the first line multiplier 203a by a first coefficient select signal SKM of four bits, which is input from the filter coefficient selector 201. The first line for multiplexing the image data multiplied by the multiplier at) and the image data input from the line delay unit 202 and the ground potential set at the first line through the first and second selection units 13 and 14. A second selector of the first line multiplexer 203b by a multiplexer 203b and a lowest coefficient select signal among the 5-bit first coefficient selector signals SKM inputted from the filter coefficient selector 201; Image data selected and inputted in (14), its inversion data and ground data and power set in itself The first inverting element 15, the third and fourth selecting units 16, 17, and the first adder 18, which multiplex the data and synthesize the same with the image data selected by the first selecting unit 13 to output the synthesized image data. A first data synthesizing unit 203c including a first delay element 19 is formed.

The second line interpolation unit 204 is configured in the same manner as the first line interpolation unit 203 and merely sets the coefficients set in the fourth to sixth multipliers 20 to 22 of the second multiplier 204a. The second line multiplexer 204b and the second data synthesis are set by the values of X8, X4, and X2, respectively, and by the 5-bit second coefficient select signal SKO generated by the filter coefficient selector 201. Multiplexed and synthesized in the unit 204c, a detailed configuration thereof is the same as the first line interpolator 203, and thus will be omitted.

In addition, the digital integrator 210 may include: a logical multiplication device 207 for performing an AND operation on the 1-bit coefficient information signal inputted from the filter coefficient selector 201 and the 11-bit previous image data fed back; The 11-bit result data multiplied by the AND device 207 and the 11-bit image data input by the first line interpolator 203 are synthesized, and the synthesized data is input from the input terminal 211. The data storage unit includes a third adder 30, a third delay unit 31, a line memory 32, and a fourth delay unit 33, which store and delay output in line units according to the transfer function count start signal. It consists of 205.

In the screen vertical compression apparatus of the present invention having such a structure, in order to reduce the size of the screen in the vertical direction in the video screen, scan line compression is required in which several scan lines are represented by one scan line.

In this case, it is necessary to filter the image data corresponding to the new scan line to be inferred from the previous and subsequent scan line data values, and the size of the circuit constituting the filter by how to define the transfer function of the filter applied thereto. Will be different.

The biggest factors that define the transfer function of the filter are frequency characteristics and phase characteristics. Finite impulse response (FIR) is used because phase characteristics are important in video signals.

In the FIR filter, in general, as the number of taps of the transfer function increases, the size of the hardware also increases, so that the number of taps of the transfer function cannot be increased.

Therefore, it is important to find the transfer function with the appropriate frequency characteristics at the appropriate tap number, which is the design basis of the filter considering the hardware size.

Importantly, in the parallel scan video signal, since the scanning line of the second field is located between the scanning lines of the first field, the filtering according to the field should be separately performed during compression, even if the source is a progressive scanning input. Filtering should be considered.

Differentiating the filter performance of the video signal considering the first field and the second field helps to optimize the size of the hardware.

In the present invention, six compression modes including bypass (1, 4/5, 2/3, 1/2, 1/3, 1/4 mode) can be selected.

5A to 5C illustrate a lookup table of the filter coefficient determiner 200 and the filter coefficient selector 201 according to the vertical compression mode of FIG. 3, and FIG. 6 illustrates line filtering according to the vertical compression mode of FIG. 3. An explanatory diagram showing the state is shown.

Hereinafter, with reference to FIG. 5, FIG. 6, it demonstrates more concretely.

) 및 그 주사방식에 따른 1비트의 필드 우선순위 데이터(

), 그 필드분에 대해 카운트되어 입력되는 3비트의 라인카운트 데이터(LCNT)가 입력되면 필터계수 결정부(200)는 그 입력된 압축모드와 이 압축모드에 따른 한 프레임에 대한 첫 번째, 두 번째 필드 및 그 필드에 대한 카운트 주사라인에 대응하는 영상데이터를 연산·조합하여 대표 영상데이터를 추출하기 위해서 도 5a 내지 도 5c와 같이, 룩업테이블로 기 저장되어 있는 4비트를 갖는 한쌍의 제 1,제 2계수결정 데이터(KM),(KO)와 1비트를 갖는 제 1,제 2계수제어신호(SM),(WL)를 발생하여 필터계수 선택부(201)에 제공하게 된다.First, 3-bit vertical compression mode data (VDM) selected by the user from an external microprocessor and 1-bit ascending or progressive scan mode data (scanning from an external controller)

) And 1-bit field priority data according to the scanning method (

When the 3-bit line count data (LCNT) counted for the field is input, the filter coefficient determiner 200 inputs the first and second of the input compression mode and one frame according to the compression mode. In order to extract and represent the representative image data by calculating and combining image data corresponding to the first field and the count scanning line for the field, as shown in FIGS. 5A to 5C, a pair of first bits having 4 bits previously stored in a lookup table. First and second coefficient control signals SM and WL having 1 bit and second coefficient determination data KM and KO are generated and provided to the filter coefficient selector 201.

)와 1비트의 필드 우선순위 데이터(

)가 "X0"로 입력되면 필터계수 결정부(200)는 현재 선택된 압축모드가 바이패스모드이고 주사방식이 격행주사모드라는 것을 판단함과 아울러 그 격행주사에 대한 한 프레임의 필드가 첫 번째 필드라는 것을 판단하여 도 5a에서와 같이, 기 설정되어 있는 각각 1비트의 계수제어신호 SM=0, WL=1을 출력하고 또한 4비트의 제 1,제 2계수결정 데이터 KM=1000, KO=0000를 발생하여 필터계수 선택부(201)에 제공하게 된다.For example, 3-bit vertical compression mode data (VDM) is input from the microprocessor as " 11X " (where X is don ^and t care), and 1-bit ascending or forward scan mode data (from external controller)

) And 1-bit field priority data (

) Is input as "X0", the filter coefficient determiner 200 determines that the currently selected compression mode is bypass mode and scanning method is an interlocking scan mode, and the field of one frame for the interlocking scan is first. It is determined that the second field is the same, and as shown in Fig. 5A, each preset coefficient control signal SM = 0 and WL = 1 is outputted, and the first and second coefficient determination data KM = 1000 and EN of 4 bits are respectively output. = 0000 is generated and provided to the filter coefficient selector 201.

When the first and second coefficient determination data KM = 1000 and KO = 0000 are input from the filter coefficient determination unit 200, the filter coefficient selection unit 201 selects a 5-bit first coefficient stored as a lookup table. The signal SKM is S4 = 1, S3 = 0, S2 = 0, S1 = X, S0 = 0, and the second coefficient selection signal SKO is S4 = 0, S3 = X, S2 = 0, S1, respectively. = X, S0 = 0, and the 1-bit coefficient control signals SM = 0, WL = 1 are bypassed by the coefficient information signal.

The 5-bit first coefficient selection signal SKM generated from the filter coefficient selector 201 is input to the first line interpolator 204, which will be described later, and the 5-bit second coefficient selection signal SKO. Is provided to the second line interpolator 204, and the first coefficient control signal SM, which is the line feedback signal, is informed to the logical multiplication device 207 of the digital integrator 210 and indicates the line to be displayed. The 1-bit second coefficient control signal WL is provided to an external controller through the output terminal 209.

As such, when a pair of first and second coefficient selection signals SKM and SKO having 5 bits are respectively input from the filter coefficient selection unit 201, the first line interpolation unit 203 is an image input terminal. 208 and the image data input by line delay through the line delay unit 202 such as flip-flop are calculated and combined according to the transfer function coefficient values set differently according to the first coefficient selection signal SKM. One representative image data from among image data of a predetermined adjacent scan line corresponding to the count line is selected and provided to the digital integrator 210.

In other words, as shown in FIGS. 5A and 6A in the bypass mode, the image data of the first scan line n0 for the first field delayed from the line delay unit 202 is stored in the first line interpolation unit ( A case in which the first line multiplier 203a of 203 and the second line multiplier 204a of the second line interpolator 204 is described will be described first. The first and second multipliers 10 and 11 configured in the line multiplier 203a respectively have coefficient values " 8 " and " 4 " in the image data of the first scan line input from the line delay unit 202 in line units. The multiplier 12 multiplies the input terminals C and D of the first selector 13 by the multiplier 12 by multiplying the image data of the first line by the coefficient value " 2 " It is provided to the input terminal (C) of.

On the other hand, the fourth and fifth multipliers 20 and 21 configured in the second line multiplier 204a of the second line interpolator 204 respectively have coefficient values set in the image data for the first input line. And multiplying " 8 " by " 4 " Reference numeral 22 denotes an input terminal C of the sixth selector 24 of the second line multiplexer 204b by multiplying the coefficient value " 2 "

In this case, the first selector 13 of the first line multiplexer 203b includes the upper bits S4 = 1 and S3 of the 5-bit first coefficient select signal SKM input from the filter coefficient selector 201. The first adder 18 of the first multiplexer 203c selects the input terminal C thereof, i.e., the data obtained by multiplying the image data for the first scan line n0 by the coefficient value "8". The second selector 14 supplies the ground potentials of its input terminals A and B by two bits S2 = 0 and S1 = X of the five-bit first coefficient selection signal SKM. Selected and provided to the input terminal (C) of the fourth selector 17, and inverted through the first inverting element 15 is provided to the input terminal (D) of the fourth selector (17).

Four selectors 17 of the first data synthesizer 203c are line-interpolated from the second selector 14 by the least significant bit S0 = 0 of the first 5-bit coefficient selector signal SKM. The data is selected and provided to the first adder 18, and the third selector 16 selects the ground potential by the least significant bit S0 = 0 to provide the first adder 18.

Accordingly, the first adder 18 of the first data synthesizing unit 203c synthesizes the image data selected and input from the first, third, and fourth selecting units 13, 16, and 17. The image data for the synthesized first scan line is provided to the digital integrating unit 210 through a first delay element 19 such as a flip-flop.

The digital integrator 210 includes a data storage unit 205 and a logical product element 207.

Accordingly, the third adder 30 of the data storage unit 205 is delayed input from the first delay element 19, that is, image data line-interpolated with a coefficient value "8" and the logical multiplication element. In this case, the first coefficient control signal SM, which is a 1-bit line feedback signal, is input as "0" from the filter coefficient selector 201. Generates 0 to be input to the third adder 30 of the data storage unit 210 regardless of the other input.

Accordingly, the third adder 30 combines the image data for the first line n0 input from the first delay element 19 and the output value "0" of the logical product element 30 to form a third value. The delay element 31 is stored in the line memory 32.

In this case, the line memory 32 stores image data pre-stored by the transfer function coefficient start point inputted through the input terminal 211 from an external controller, that is, image data obtained by multiplying the count value "8" by a fourth time. The delay element 33 is provided to the line combining unit 206 to be described later.

On the other hand, the second line multiplexing unit 23 has its input terminal (S4 = 0, S3 = X) by the higher bits of the second coefficient selection signal SKO of 5 bits inputted from the filter coefficient selection unit 201. A), (B), i.e., a ground potential, is selected and provided to the second adder 28 of the second data synthesizing unit 204c, and the sixth selecting unit 24 supplies the second coefficient selection signal of the five bits. SKO) selects the ground potentials of the input terminals (A) and (B) by S2 = 0 and S1 = X of 2 bits and provides them to the input terminal (C) of the eighth selector (27). Inverting through the inverting element 25 is provided to the input terminal (D) of the eighth selector (27).

The eight selectors 27 of the second data synthesizing unit 204c are respectively selected and input from the sixth selector 24 by the least significant bit S0 = 0 of the five-bit second coefficient selection signal SKO. The potential, i.e., "0" is selected and provided to the second adder 28, and the seventh selector 26 selects the ground potential by the least significant bit S0 = 0 to provide it to the second adder 28.

Accordingly, the second adder 28 of the second data synthesizing unit 204c synthesizes the ground potentials selected and input from the fifth, seventh, and eighth selectors 23, 26, and 27, respectively. The second line interpolation unit 206 is provided to the line combining unit 206 through a second delay element 29 such as a flip-flop, so that the second line interpolator 204 is applied to the first scan line of the first field in the bypass mode. On the other hand, the transfer function coefficient K0 of the filter is set to " 0 "

The fourth adder 34 of the line synthesizer 206 has an 11-bit value obtained by multiplying the ground potential input from the second line interpolator 204 by the coefficient value "8" through the digital integrator 210. By synthesizing the image data and multiplying the synthesized 11-bit image data by the coefficient value 1/8 set through the seventh multiplier 35, the transfer function coefficient KM " 1 " of the filter is applied as a result.

The image data of the first scan line multiplied by the seventh multiplier 35 is stored in another line memory later through the fifth delay element 36 and the output terminal 212 and displayed on the screen.

At this time, an external controller controls the line memory by the second coefficient control signal WL = 1 indicating the display scan line from the filter coefficient selector 201 to display image data corresponding to the scan line. Will be given.

As described above, in the case of the compression mode in the bypass scanning method, the image transfer function coefficient KM corresponding to each scan line of the first field and the second field is set to "1" through the above-described method. By interpolation, the video signal is displayed without being compressed over the entire 16: 9 screen or 4: 3 screen.

)가 각각 "11"로 입력된다.When the compression mode is the bypass mode and the scanning method is the forward scanning method, that is, when the input source is the forward scanning input, at this time, 1 bit of the forward scanning mode data (PRG) and 1 bit are used. Field priority data for

) Are input to "11", respectively.

Here, it should be noted that even in the case of the progressive scan method, the filtering should be performed in consideration of the annular scanning process.

In other words, as illustrated in FIG. 6A, the current scan line and the previous scan line in the second field may be five-bit first and second coefficient selection signals SKM generated by the second filter coefficient selector 201. The line interpolation should be performed by using (SKO) with the transfer function coefficient (KM) and (KO) as "1/2", respectively.

The transfer function coefficient KM of the previous scan line fed back from the line memory 32 of the digital integrator 210 and the transfer function coefficient KO of the current scan line input from the second line interpolator 204 are calculated. This is possible by multiplying the coefficient value 1/8 by the seventh multiplier 35 of the line combining unit 206.

As a result, in the bypass mode in the forward scan method, as shown in FIG. 6A, the scanning line of the second field should be filtered by the transfer function h (n) = [1 1] / 2.

When the compression mode is 4/5 in the interpolation scanning method, as shown in FIG. 6B, the scan lines of the first field and the second field for one frame are counted by five lines, respectively, where one scan line is used. It is a mode for interpolating and using only four adjacent scan lines without interpolation.

Therefore, the case where the compression mode is 4/5 in the parallel scan method will be briefly described below.

)가 "X0"로 하여 필터계수 결정부(200)에 입력됨과 아울러 3비트의 라인카운트 데이터(LCNT)가 입력된다.First, in the 4/5 vertical compression mode, 3 bits of vertical compression mode data (VDM) are input as "101", and 1 bit of progressive scan mode data (INT) and 1 bit of field priority data (

) Is input to the filter coefficient determination unit 200 as "X0" and three-bit line count data LCNT is input.

The line count data LCNT is a scan line for one field from an external controller is counted according to the compression mode and input in units of 3 bits.

Accordingly, the filter coefficient determination unit 200 described above outputs the coefficient control signals SM = 0 and WL = 0 of 1 bit, respectively, as shown in FIG. 5A, and the first and second coefficients of 4 bits. Decision data KM = 1000 and KO = XXXX are generated and provided to the filter coefficient selector 201.

The filter coefficient selector 201 generates a 5-bit first coefficient selection signal SKM, which is stored as a look-up table in S4 = 1, S3 = 0, S2 = 0, S1 = X, and S0 = 0. Then, the second coefficient selection signal SKO generates S4 = S3 = S2 = S1 = S0 = X, and each of the 1-bit coefficient control signals SM = 0 and WL = 0 are counted information signals. Bypassed.

Accordingly, the first selector 13 of the first line multiplexer 203b of the first line interpolator 203 described above is multiplied by the coefficient value "8" from the first line multiplier 203a. After selecting 11 bits of image data for the first scan line n0, the second selector 14 selects the ground potentials input to its input terminals A and B, and the third and fourth selectors. 16 and 17 also select the ground potential, and as a result, the image data selected by the first selector 13 is added to the first adder 18 and the first delay element of the first data synthesizer 203c. After the line delay through 19, it is stored in the line memory 32 of the digital integrator 210.

In this case, the line memory 32 lines the image data obtained by multiplying the count value "8" by the transfer function coefficient start point inputted from the external controller through the input terminal 211 through the fourth delay element 33. The fourth line adder 34 of the combiner 206 is provided. In this case, the second line interpolator 204 includes all of the five-bit second coefficient select signal SKO from the filter coefficient selector 201. By inputting Don ^, t Care, the input image data corresponding to the first scan line n0 is blocked.

Therefore, as shown in FIG. 6B, only the 11-bit image data of the first scan line n0 of the first field multiplied by the coefficient value "8" in the first line interpolator 203 is the line synthesizer 206. Multiplied by the coefficient value 1/8 through the seventh multiplier 35 of the &lt; RTI ID = 0.0 &gt;) &lt; / RTI &gt; In the filter, the transfer function coefficient value (KM) "1" is applied.

The image data of the first scan line n0 stored in the line memory is displayed on the screen by a second coefficient control signal WL = 0 indicating that the display scan line from the filter coefficient selector 201 is a display scan line. Is displayed.

In the second scanning line n1 for the first field, as shown in FIG. 5A, the first coefficient selection signal SKM having 5 bits from the filter coefficient selection unit 201 is S4 = 1, S3 = 1. , S2 = 1, S1 = 0, S0 = 0 and the second coefficient selection signal SKO is generated as S4 = 0, S3 = X, S2 = 0, S1 = X, S0 = 0, and Since the first and second coefficient control signals SM = 0 and WL = 1 are generated, the first selector 13 of the first line interpolator 203 multiplies the coefficient value "4" by the first line multiplier 203a. The 11-bit image data of the second scan line n1 is selected, and the second and fourth selectors 14 and 17 multiply the coefficient value "2" from the first line multiplier 203a. By selecting the image data, as a result, the image data for the second scanning line n1 selected by the first selecting unit 13 and the image data selected by the fourth selecting unit 17 are combined with the first data synthesizing unit 203c. Synthesized and delayed through the It is stored in the re 32. The

In addition, the fifth, seventh, and eighth selectors 23, 26, and 27 of the second line interpolator 204 select ground potentials and provide them to the line synthesizer 206. In the line synthesizing unit 206, only the image data of the second scanning line n1 input from the line memory 32 of the digital integrating unit 210 is actually counted through the seventh multiplier 35. After multiplying by &lt; Desc / Clms Page number 5 &gt; and storing it in the line memory at the rear end through the fifth delay element 36, the result that the transfer function coefficient value KM &quot; 3/4 &quot; do.

In this case, the image data of the second scan line n1 stored in the line memory is not displayed on the screen but synthesized with the image data corresponding to the third scan line n2 which is input later.

That is, in the third scan line n2, as shown in FIG. 5A, the first coefficient selection signal SKM having 5 bits from the second filter coefficient selection unit 201 is S4 = 1, S3 = 1, S2 = 0, S1 = X, S0 = 0 and the second coefficient selection signal SKO is generated as S4 = 0, S3 = X, S2 = 1, S1 = 0, S0 = 0, and The two-coefficient control signal is generated with SM = 0 and WL = 1, respectively.

Accordingly, the first selector 13 of the first line interpolator 203 has an 11-bit image of the third scan line n2 multiplied by the coefficient value "4" from the first line multiplier 203a. After selecting the data, the second to fourth selectors 14 to 17 all select the ground potential and store the data in the line memory 32 of the digital integrator 210.

The sixth and eighth selectors 24 and 27 of the second line interpolator 204 have a third scan line n2 multiplied by a coefficient value "2" from the second line multiplier 204a. 11-bit image data is selected and provided to the line synthesizer 206.

The line synthesizing unit 206 multiplies the image data of the third scanning line n2 input from the second line interpolation unit 204 by the coefficient value 1/8 through the seventh multiplier 35 and then WP 5. The delay line 36 is stored in a line memory at a later stage. The first line interpolator 203 is formed by two third and fourth delay elements 31 and 33 of the digital integrator 210. Since the coefficient value KM is delayed by one liner, the third scan line n2 to which the filter transfer function coefficient value "1/4" of the second line interpolator 204 is applied first is stored in the external line memory. It is stored.

At this time, the transfer function of the filter with respect to the third image and the third scan line (n2) and the previous image data is applied to the transfer function coefficient value (KM) "3/4" of the filter for the second scan line (n1) stored in the line memory The current image data to which the count value "1/4" is applied is combined and displayed on the screen as the image data of the actual second scanning line.

Thereafter, the line synthesizing unit 206 transmits the image data corresponding to the previous third scanning line n2 stored in the line memory 32 of the digital integrating unit 210 through the seventh multiplier 35 to obtain a coefficient value 1 /. Multiplying by 8 and storing it in the line memory at the rear end through the fifth delay element 36 and applying the transfer function coefficient value "1/2" (KO) of the filter to the subsequent fourth scanning line n3; By synthesizing a new third scan line is generated to display the corresponding image data on the screen.

In this manner, the remaining fourth scan line is newly generated and displayed on the screen by the same method as described above, and the second field is processed in the same manner as the first field.

In the case of the 4/5 compression mode in the forward scanning method, the filter is filtered in the same manner as described in the above-described bypass mode, but as shown in FIG. 6B, the transfer function h (n) of the filter according to the scan line of the second field is shown. ) = [3 5 1 7] / 2 should be filtered.

Also, in the 3/4 compression mode, since the transfer function coefficient of the same filter as in the 4/5 compression mode is used and only three scan lines are generated and compressed, only four scan lines are generated and the operation thereof will be omitted.

In addition, the 2/3, 1/2, 1/3, and 1/4 compression modes of FIGS. 6C to 6F also use the look-up table of FIGS. 5B and 5C described above to adjust the screen size in the vertical direction. This can be reduced by combining the front and rear adjacent scan lines into one according to the vertical compression mode to create a representative new scan line.

On the other hand, as a comparative example, the clock circuit is accurately corrected in the case of vertically compressing image data through the first and second multipliers according to the conventional configuration, that is, the compression ratio of the clock generated by the clock generator according to the vertical compression mode. Unlike to be controlled, the present invention differentiates the digital filter performance by separating and filtering the first field and the second field separately during vertical compression, that is, by combining the individual digital filters according to the vertical compression mode into one block. Vertical compression in various modes is possible without increasing.

As a result, according to the present invention, it is possible to realize various types of vertical compression equal to or higher than the conventional one while increasing the accuracy of the vertical compression, and to carry out both the progressive scan and the forward scan processing with one filter circuit in the vertical compression mode. Able to know.

As described above, in the present embodiment, since the first and second fields are separately filtered in consideration of the fact that the television broadcast signal is a hit scan, the screen vertical compression ratio is more diversified, and as a result, the user desires the screen. It is possible to select a wider range of vertical compression ratios.

In addition, according to the above application, the number of taps of the filter circuit is minimized by synthesizing the individual filters according to various vertical compression modes into one block, and the size of the hardware is optimized, and the screen vertical compression process equivalent to the conventional technology is performed. It can be realized.

In addition, while specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that the screen vertical compression apparatus of the present invention can separate and filter the first field and the second field for one frame, thereby compressing the screen vertical compression ratio to a wider range. In addition, by synthesizing the vertical compression filter into one block, the number of taps of the filter is minimized, thereby simplifying the hardware and operating the system stably.

Claims (20)

Determining a vertical compression mode and a priority and a scanning method of a field for one frame; Determining a transfer function coefficient value of the filter by counting a scan line for one field due to the priority according to the determined vertical compression mode; Calculating and combining the determined transfer function coefficient values into predetermined adjacent scan lines corresponding to the count lines among a plurality of input scan lines, and extracting scan lines representative for each field; And And reducing the size of the screen in the vertical direction in at least six modes including a bypass by recording image data corresponding to the extracted scan line according to the vertical compression mode. The method of claim 1, The scanning line extracting step is represented by a combination of multiplying transfer function coefficient values corresponding to predetermined adjacent scan lines before and after each including the first scan line counted in one field according to the compression ratio to the screen aspect ratio. The vertical compression method of the screen, characterized in that one scan line is selected. The method of claim 2, And said predetermined adjacent line is at least two lines before and after including a first scan line for one field. The method of claim 1, The transfer function coefficient value determination is performed by counting the scan line for a field for one frame in compression units and selecting and determining the transfer function coefficient value corresponding to the scan line value obtained by counting the screen vertical compression. Way. The method of claim 4, wherein Compression unit counts are counted in at least five scan line units including the front and rear scan lines in one field. The method of claim 1, The scanning method includes a progressive scan method and a forward scan method, and when the method determined by the progressive scan method and the progressive scan method is the progressive scan method, a transfer function coefficient is obtained by separating the first field and the second field. Screen vertical compression method characterized in that the filter by value. Determining a compression mode, a scanning method, a priority of a field for the scanning method, and scanning line values obtained by counting the compression unit for the fields; Generating a pair of first and second coefficient determination data having at least 4 bits to extract and represent representative image data by calculating and combining the image data corresponding to the scanning lines of the first and second fields for the determined compression mode. step; The transfer function coefficient of the filter set is calculated and combined with the image data of a predetermined adjacent scan line among the several scan lines input according to the generated pair of first and second coefficient determination data. Extracting image data corresponding to one representative scan line; And And compressing the screen size in at least six modes including a bypass by recording image data of a representative scan line for one frame extracted corresponding to the vertical compression mode. The method of claim 7, wherein The scanning method includes a progressive scan and a forward scanning method, and the predetermined adjacent lines in the traveling scan method and the forward scanning method include a current scanning line for one field according to the compression mode, and at least Screen vertical compression method characterized by more than five lines before and after. The method of claim 7, wherein When the scanning method is a forward scanning method and the compression mode is a bypass mode, the first field is filtered by applying a transfer function coefficient value of "1", and the second field is set with the following conditions. Screen vertical compression method characterized by filtering h (n) = (1 1) / 2 Where h is the transfer function and n is the coefficient. The method of claim 7, wherein When the scanning method is a progressive scan method and the compression mode is a 1/4 mode, the screen vertical compression method characterized in that the transfer function coefficient values for each of the first field and the second field are differently set and filtered under the following conditions. h (n) = (1 1 1 1) / 4 h (n) = (1 2 2 1 1) / 4 Where h is the transfer function and n is the coefficient. The method of claim 10, When the scanning method is a forward scanning method and the compression mode is a 1/4 mode, the vertical screen compression method characterized in that the filtering by setting the transfer function coefficient value for one frame under the following conditions h (n) = (1 1 1 1) / 4 Where h is the transfer function and n is the coefficient. Image of the compression mode and the scanning method, the field priority for the scanning method, and the line values obtained by counting the fields, and the count values of the first and second fields of the input compression mode. Filter coefficient determination means for generating a pair of first and second coefficient determination data having at least four bits and first and second coefficient control signals having one bit to calculate and combine the data to extract the representative image data; A pair of first and second having at least 5 bits for selecting a coefficient value corresponding to the scan line according to the first and second coefficient determination data and the first and second coefficient control signals obtained by the filter coefficient determination means; Filter coefficient selecting means for generating first coefficient coefficient information having at least one bit and a second coefficient selection signal; Line delay means for delaying the input image data in line units; Transfer of a filter set differently to image data of a predetermined adjacent scan line corresponding to the count line among the image data obtained by the line delay means according to the first and second coefficient selection signals obtained by the filter coefficient selection means. First and second line interpolation means for calculating and combining the function coefficients to extract one representative image data respectively; The previous image fed back and inputted with the image data of the first line interpolation means according to the 1-bit first coefficient information for feedback of the image data from the filter coefficient selection means and the transfer function coefficient start time signal obtained from an external controller. Digital integrating means for synthesizing, delaying, storing, and outputting data, and for inputting this value to previous data; And And line synthesizing means for calculating and outputting the image data obtained by said digital integrating means and the image data obtained by said second line interpolation means. The method of claim 12, The first line interpolation means includes: first line multiplication means for multiplying image data obtained by the line delay means by coefficient values differently set; First line multiplexing means for multiplexing the image data multiplied by the first line multiplication means, the image data obtained by the line delay means, and the self-setting data by a 5-bit first coefficient selection signal obtained by the filter coefficient selecting means; And Multiplexing the image data selected by the first line multiplexing means, the inversion data thereof, the ground data set in itself, and the power data by any one of the five-bit first coefficient selection signals obtained by the filter coefficient selection means And first data synthesizing means for synthesizing and outputting the synthesized data. The method of claim 13, And said first line multiplying means multiplies at least different coefficient values X8, X4, and X2 by the image data obtained by said line delay means. The method according to claim 13 or 14, The first line multiplexing means selects any one of the image data multiplied by the coefficient value X8 and X4 from the first line multiplication means and the upper two bits of the five-bit first coefficient selection signal among its own ground data. First selection means for performing Combining the first data by selecting any one of the image data obtained by the line delay means, its own ground data and the image data multiplied by the coefficient value X2 from the first line multiplication means by the lower two bits of the first coefficient selection signal. And a second selection means provided to the means. The method of claim 15, The first data synthesizing means comprises: third selecting means for selecting any value by the least significant bit of the first coefficient selection signal among 1-bit data and ground data set in the self; Fourth selecting means for selecting one of the output values of the second selecting means and its inverted value by the least significant bit of the first coefficient selecting signal; And A first adder for adding an output value of the first selection means and an output value of the third and fourth selection means; And And a first delay element for delaying the output value of the first adder by a line unit. The method of claim 12, The digital integrating means includes: an AND function for performing an AND operation on the first image information obtained by feedback from the first coefficient information for feedback of the image data from the filter coefficient selection means; And a data storage means for synthesizing the output data of the logical multiplication device and the image data obtained by combining the first line interpolation means, and delaying and storing the synthesized image data to the line synthesizing means. One screen vertical compression device. The method of claim 12, The second line interpolation means multiplies the image data for one scan line obtained by the line delay means by at least different coefficient values X8, X4, and X2, respectively, and the multiplied image data and the non-multiplied image data and itself. And at least three values are selected and synthesized by the second coefficient selection signal of the five bits from among the two bits of data set to be delayed in units of lines. The method of claim 12, The line synthesizing means includes: an adder including the first line interpolation means to add image data delayed by at least three lines in the digital integration means and image data delayed by one line in the second interpolation means; A multiplier for multiplying the output value of the adder by an arbitrary coefficient value; And And a delay element configured to delay-output the image data multiplied by the multiplier in line units. The method of claim 19, And an arbitrary coefficient value set in the multiplier is 1/8.

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