KR960000504A - Field interpolation method of color video printer - Google Patents

Abstract

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a field interpolation method and apparatus in a non-real time printer system for printing a still image over time, such as a color video printer.

The field interpolation method of an image frame according to the present invention includes a first pixel of the first field and a second pixel adjacent to the first pixel, left and right, respectively, one horizontal synchronization period before any pixel of the second field of the image frame. And the fourth pixel after one horizontal synchronizing period, and the fifth and sixth pixels adjacent to the fourth pixel left and right, respectively, according to the color boundary, according to the color boundary. An interpolation method setting step of setting a plurality of interpolation methods for an arbitrary pixel of the second field according to the arrangement relationship of each divided pixel; A delay step of delaying image data of the first to sixth pixels by a predetermined period, and interpolation of calculating a plurality of interpolation values according to the plurality of interpolation schemes using the level values of the first to sixth pixels A value calculating step, a type determining step of a pixel group determining a type of a pixel group consisting of the first to sixth pixels using the image data of the first to sixth pixels, and And an interpolation value selection step of selecting one of the calculated plurality of interpolation values according to a type.

Field interpolation apparatus of a video frame according to the present invention is a delay means for the video signal for delaying the predetermined video signals of the first field applied to the input terminal by a predetermined period, a plurality of interpolation scheme with the level values of the delayed video signals Calculating a plurality of interpolation values according to the interpolation value calculating means, and classifying the types of the video signals in the predetermined number of pixel units which are delayed by a predetermined calculation process using the level values of the delayed video signals, And means for outputting different signals according to the type, and a multiplex for selectively outputting one of the calculated interpolation values according to the signal output from the calculation means.

By using the field interpolation method or apparatus of the image frame according to the present invention, there is an advantage that the connection of the inclination line is smoother and the boundary becomes clearer than the conventional art when the color boundary exists.

Description

Field interpolation method of color video printer

As this is a public information case, the full text was not included.

1 is an explanatory diagram for explaining a conventional field interpolation method.

2 is an explanatory diagram for explaining the concept of a field interpolation method of an image frame according to the present invention.

3 is an explanatory diagram for explaining a field interpolation method of an image frame according to the present invention.

4 is a field interpolation apparatus for an image frame according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Slice 1a: Odd Number Slice

1b: Even slice 10: Arbitrary pixel

11-16: 1st pixel-6th pixel 20: Input terminal

31 to 34: first flip-flop to fourth flip-flop 40: delay

50: calculation means 60: multiflux

101 to 114: 1st to 14th attenuators 121 to 125: 1st to 5th adders

Claims (10)

A field interpolation method of an image frame for interpolating predetermined image data of a first field of an image frame to obtain image data of a second field of the image frame, wherein the horizontal interpolation method is performed by more than one pixel of an arbitrary pixel of the second field of the image frame. The first pixel of the first field before the period, the second pixel and the third pixel adjacent to the first pixel to the left and right, respectively, and the fourth pixel after one horizontal synchronization period than the arbitrary pixel of the second field. The fifth and sixth pixels adjacent to the four pixels, respectively, are divided into two types according to the color boundary, and a plurality of interpolation methods for arbitrary pixels of the second field are arranged according to the arrangement relationship of the divided pixels. An interpolation method setting step of setting; A delay step of delaying image data of the first to sixth pixels by a predetermined period; An interpolation value calculating step of calculating a plurality of interpolation values according to the set plurality of interpolation schemes using the level values of the first to sixth pixels; A type determination step of determining a type of a pixel group consisting of the first to sixth pixels using the image data of the first to sixth pixels; And an interpolation value selection step of selecting one of the calculated plurality of interpolation values according to the type of the determined pixel group. The method of claim 1, wherein the interpolation method set in the interpolation method setting step comprises: a first interpolation method for averaging image data values of the first and fourth pixels, and an image data value of the third and fifth pixels. A second interpolation method for averaging; a third interpolation method for averaging image data values of the second and sixth pixels; a second average of video data values of the first and second pixels, a fourth pixel, and a sixth pixel; And a fifth interpolation method of averaging video data values of a first pixel, a third pixel, a fourth pixel, and a fifth pixel. 2. The method of claim 1, wherein the delaying step delays the first pixel by one pixel period longer than the two horizontal synchronization periods, and delays the second pixel by one pixel period longer than the first pixel. Is delayed by one pixel period less than the first pixel, the fourth pixel is delayed by one pixel period, the fifth pixel is delayed by two pixel periods, and the sixth pixel is not delayed. How to interpolate fields in a frame. The method of claim 2, wherein the determining of the type of the pixel group comprises: calculating a standard deviation according to a level value of the image data of the first to sixth pixels; A type determination data calculating step of calculating data necessary for type determination of the pixel group using the level values of the image data of the first to sixth pixels; A reference value calculating step of calculating a predetermined reference value according to the calculated standard deviation and type determination data; And a data comparison classification step of discriminating whether the pixel group corresponds to a pixel group corresponding to a type of the interpolation method among the first to fifth interpolation methods by comparing the calculated type determination data with a reference value. Field interpolation method of video frame. 5. The method of claim 4, wherein assuming that image values of the first to sixth pixels are A to F, the data calculated in the type determination data calculating step are Equation 1): 2 × | B-F | (2): | (A + C)-(D + E) | Equation 3): 2 × | E-C | (4): | (A + B)-(D + F) | Equation 5): 2A + 2FA + C + D + E Equation 6): 2E + 2CA + B + D + F Equation 7): | (2A + 2F)-(A + C + D + E) | (8): | (2E + 2C)-(A + B + E + F) | Expression 9): Expression 1) Expression 2) | Expression 10): Expression 3) Expression 4) | Field interpolation method of an image frame, characterized in that the values obtained by. 6. The method according to claim 5, wherein the predetermined reference value is a value of expression 1) and a value of expression 2), and a value of expression 3) of the value of expression 1) to a value of expression 4) if the condition of the value of expression 4) is not satisfied. If the maximum value is not satisfied, the value of Equation 2) is again determined to be equal to or greater than the value of Equation 4). If this is satisfied, the value is twice the value of Equation 2). A first reference value obtained by selecting; And a second reference value obtained by subtracting the standard deviation from the first reference value. The method of claim 6, wherein the data comparison step comprises the values of Equation 1) and Equation 3) greater than the second reference value, and Equation 2) and Equation 4) of the equations 1) to 4), respectively. In the case of smaller values, in the above formulas 1) to 4), the values of formulas 1), 2) and 3) are respectively greater than the second reference value, and the values of formulas 2) and 4) are less than the first reference value, respectively. In Expressions 1) to 4), when Expressions 1), 3) and 4) are greater than the second reference value, and Expressions 2) and 4) are less than the first reference value, Equation 1) In equations (4), when the values of equations (1) to (4) are larger than the second reference value, respectively, and the values of equations (2) and (4) are respectively smaller than the first reference value, When the value is greater than the second reference value, the value of Equation 7) is greater than the first reference value, and the value of Equation 8) is less than the second reference value, the value of Equation 1) is greater than the second reference value in Equations 1) to 4). , Equation 8) is greater than the first reference value, Equation 7) is less than the second reference value, and Equation 5) is zero. In the case where the value of Equation 6) is not 1, the value of Equation 1) is greater than the second reference value in Equations 1) to 4), and the value of Equation 8 is greater than the first reference value, and the value of Equation 7 is the second reference value. Is smaller than Equation 5) and Equation 6) is 1, the values of Equations 1) to 4) are smaller than the second reference value, Equation 5) is 0, and Equation 6) is 0. In the case where the value of Equation 1) to Equation 4 is smaller than the second reference value, Equation 5) is 1, and Equation 6) is 1, the value is divided into pixel groups of types to be interpolated by the first interpolation method. In the above formulas 1) to 4), when the values of formulas 1) and 4) are larger than the second reference value, the values of formulas 1) to 4) are smaller than the second reference value, and the value of formula 5) is 0. 6) When the value is 1, it is divided into the pixel group of the type to be interpolated by the second interpolation method, and when the values of Equation 2) and Equation 3) are larger than the second reference value in Equations 1) to 4), When the values of Equations 1) to 4) are smaller than the second reference value, Equation 5) is 1, and Equation 6) is 0, The pixel group of the type to be interpolated by the third interpolation method is used, and in Equations 1) to 4), Equation 3) is larger than the second reference value, Equation 10) is larger than the second reference value, and Equation 9). When the value is smaller than the second reference value, when the value of Equation 1) is greater than the second reference value in Equations 1) to 4) and the value of Equation 9) and Equation 10 is smaller than the second reference value, interpolation is performed using the fourth interpolation method. When the value of Equation 3) is greater than the second reference value and Equation 9) and Equation 10) is smaller than the second reference value in Equation 1) to Equation 4), In equation 4), when the value of equation 1) is greater than the second reference value, the value of equation 9) is greater than the second reference value and the value of equation 10) is less than the second reference value, A field of an image frame, characterized in that divided into pixel groups, and in the other cases, divided into pixel groups of types to be interpolated by the first interpolation method. How the liver. A field interpolation apparatus of a video frame for obtaining video data of a second field of the video frame by interpolating predetermined video data of a first field of a video frame applied to the input terminal, having an input terminal of a video signal. Video signal delay means for delaying predetermined video signals of the first field applied by a predetermined period; Interpolation value calculating means for calculating a plurality of interpolation values according to a plurality of interpolation methods with the level values of the delayed video signals; Computing means for classifying the types of video signals behind the delayed predetermined number of pixel stages through a predetermined calculation process using the level values of the delayed video signals and outputting different signals according to the type of the divided video signals; And a multiplex for selectively outputting one of the calculated plurality of interpolation values according to the signal output from the calculating means. 9. The apparatus of claim 8, wherein the delay means is further configured to delay a predetermined video signal applied to the input terminal by one pixel period and further delay the video signal output from the first flip flop by one pixel period. A second flip-flop, a delay for delaying a predetermined video signal applied to the input terminal by two horizontal synchronizing periods, a third flip-flop for further delaying the predetermined video signal delayed by the delaying device by one pixel period, and the And a fourth flip-flop for further delaying a predetermined video signal output from the third flip-flop by one pixel period. 10. The apparatus of claim 9, wherein the interpolation value calculating means comprises: a first attenuator for attenuating the video signal output from the first flip-flop in half and a second for attenuating the video signal output from the third flip-flop in half First interpolation value calculating means comprising attenuator and a first adder for adding the first attenuator and the video signal attenuated by the attenuator; A third attenuator for attenuating the video signal output from the second flip-flop in half, a fourth attenuator for attenuating the video signal output from the delayer in half, and the attenuated in the third and fourth attenuators Second interpolation value calculating means including a branch adder for adding a video signal; A fifth attenuator for attenuating the non-delayed video signal to the input terminal in half, a sixth attenuator for attenuating the video signal output from the fourth flip-flop in half, and attenuating in the fifth and sixth attenuators Third interpolation value calculating means comprising a third adder for adding the received video signal; A seventh attenuator for attenuating the video signal output from the first flip-flop to one quarter; an eighth attenuator for attenuating the video signal output from the third flip-flop to one quarter; a delay applied to the input terminal A ninth attenuator for attenuating the non-video signal by one quarter, a tenth attenuator for attenuating the video signal output from the fourth flip-flop by a quarter, and an image attenuated by the seventh to tenth attenuators Fourth interpolation value calculating means comprising a fourth adder for adding signals; And an eleventh attenuator for attenuating the video signal output from the first flip-flop by a quarter, a twelfth attenuator for attenuating the video signal output from the third flip-flop by a quarter, and the second flip-flop. A thirteenth attenuator for attenuating the video signal outputted from the quarter by a quarter, a fourteenth attenuator for attenuating the video signal output from the delayer by a quarter, and the attenuated in the eleventh to fourteenth attenuators respectively; And a fifth interpolation value calculating means comprising a fifth adder for adding the video signal. ※ Note: The disclosure is based on the initial application.