KR100955430B1 - Interpolation method and device - Google Patents

Abstract

PURPOSE: An interpolation method and a device thereof are provided to interpolate a target frame in consideration of a skipped frame. CONSTITUTION: An information acquisition unit(210) acquires the interpolation frame information from at least one of a decoding unit, reference frames and macro block type and motion vector value. An interpolation processor(220) calculates the ratio information of interpolation target frame through the interpolation frame information. According to the type of the macro block, the interpolation processing unit interpolates the target frame through at least one of the ratio information, the pixel information of the reference frame and the motion vector value.

Description

Interpolation method and device

The present invention relates to image processing, and more particularly, to a method and apparatus for interpolating skipped frames according to types of macroblocks.

Techniques used for interpolation include frame repetition, bilinear interpolation, and motion vector interpolation. The most representative interpolation technique is motion vector interpolation. In the case of a motion vector interpolation technique, interpolation is performed using a motion vector value of a reference frame and a pixel value of a region indicated by the motion vector. The existing interpolation technique is constructed by combining the above techniques.

However, the previous interpolation techniques have a problem that does not consider the characteristics of the skipped frames obtained in the frame skipping technique.

The present invention provides an interpolation apparatus and method capable of interpolating an interpolation target frame in consideration of characteristics of a skipped frame.

In addition, the present invention is to provide an interpolation apparatus and method capable of interpolating different interpolation target frame according to the type of macroblock.

The present invention also provides an interpolation apparatus and method capable of interpolating the interpolation target frame according to a ratio corresponding to the position of the interpolation target frame among a plurality of consecutive frames to be interpolated.

According to one aspect of the present invention, an interpolation apparatus capable of interpolating a skipped frame is provided.

According to one aspect of the present invention, an interpolation apparatus capable of interpolating a skipped frame is provided.

According to an embodiment of the present invention, an interpolation apparatus includes: a decoding unit for decoding an input bitstream; An information obtaining unit obtaining one or more of interpolated frame information, one or more reference frames, a macroblock type, and a motion vector value from the decoding unit; And an interpolation processor configured to calculate ratio information of the interpolation target frame using the interpolation frame information, and interpolate the interpolation target frame using the ratio information, pixel information of the reference frame, or the motion vector value according to the macroblock type. An interpolation apparatus including a may be provided.

The apparatus may further include a pixel padding unit that pads the pixels not interpolated by the interpolation processor by using one or more adjacent pixels.

If the macroblock type of the later reference frame is a skipped macroblock (SKIP MB), the interpolation processor sets the same position as the pixel position of the later reference frame to the position of the interpolation target pixel of the interpolation target frame and refers to the later reference. The pixel information of the frame and the previous reference frame may be multiplied by the ratio information to calculate the pixel value of the interpolation target pixel.

If the macroblock type of the later reference frame is an intra macroblock (INTRA MB), the interpolation processor sets the pixel position of the rear reference frame to the position of the interpolation target pixel of the interpolation target frame, and the rear reference frame and the front reference frame. The pixel value of the interpolation target pixel may be set using pixel information of a frame adjacent to the interpolation target frame among reference frames.

The interpolation processor may interpolate an interpolation target frame differently according to the motion vector value when the macroblock type of the later reference frame is an INTER MB.

The interpolation processor, when the macroblock type of the rear reference frame is an INTER MB, the position of the interpolation target pixel by moving the position obtained by multiplying the motion vector value by the ratio information at the pixel position of the rear reference frame. The pixel value of the interpolation target pixel is calculated by multiplying the pixel information of the later reference frame and the pixel position of the previous reference frame by the motion vector value by the ratio information and multiplying the moved pixel information by the ratio information. can do.

The pixel padding unit may pad the non-interpolated pixels using an average value of one or more adjacent interpolated pixel values.

The interpolation frame information is the number of frames to be interpolated.

According to another aspect of the present invention, a method for interpolating a skipped frame in consideration of frame characteristics is provided.

According to an embodiment of the present invention, in an interpolation apparatus, an interpolation apparatus decodes a skipped frame, and decodes an input bitstream to obtain one or more of interpolation frame information, one or more reference frames, a macroblock type, and a motion vector value. Obtaining; Calculating ratio information of an interpolation target frame using the interpolation frame information; And interpolating interpolation target frames differently using the reference frame, the motion vector value, or the ratio information according to the macroblock type.

After interpolating the interpolation target frame, the method may further include scanning the interpolation target frame in a set scanline direction and padding the uninterpolated pixel using one or more adjacent interpolated pixels.

Padding using the interpolated pixels may be padded using an average value of one or more interpolated pixels adjacent to the uninterpolated pixel.

The macroblock type is a macroblock type of a later reference frame and is one of skipped macroblock (SKIP MB), intra macroblock (INTRA MB), and inter macroblock (INTER MB).

If the macroblock type is the skipped macroblock, interpolating the interpolation target frame may include: setting a pixel position of the rear reference frame as a position of an interpolation target pixel of the interpolation target frame; And calculating the pixel value of the pixel to be interpolated by multiplying the ratio information by the pixel information of the back reference frame and the previous reference frame.

If the macroblock type is the intra macroblock, interpolating the interpolation target frame comprises: setting a pixel position of the rear reference frame as an interpolation target pixel position of the interpolation target frame; And a pixel value of the interpolation target pixel using pixel information of a reference frame adjacent to the interpolation target frame among the back reference frame and the front reference frame.

If the macroblock type is the inter macroblock, interpolating the interpolation target frame may include: moving the position by multiplying the motion vector value by the ratio information at a pixel position of the rear reference frame to interpolate the interpolation target of the interpolation target frame. Setting as the position of the pixel; And calculating the pixel value of the pixel to be interpolated by multiplying the ratio information by the pixel information of the moved position by multiplying the motion vector value by the ratio information at the pixel information of the rear reference frame and the pixel position of the previous reference frame. It may include.

According to another embodiment of the present invention, a program of instructions that can be executed by the digital processing apparatus for the interpolation of a skipped frame is tangibly implemented, and a recording medium having recorded thereon a program which can be read by the digital processing apparatus. Decoding the input bitstream to obtain interpolation frame information, one or more reference frames, a macroblock type, and a motion vector value; Calculating ratio information of an interpolation target frame using the interpolation frame information; And a recording medium recording a program for performing interpolation of the interpolation target frame differently using the reference frame, the motion vector value or the ratio information according to the macroblock type.

By providing the interpolation apparatus and method according to the present invention, the interpolation target frame can be interpolated in consideration of the characteristics of the skipped frame.

In addition, the present invention has the effect of interpolating the interpolation target frame differently according to the type of the macroblock.

The present invention also has the effect of interpolating the interpolation target frame according to a ratio corresponding to the position of the interpolation target frame among a plurality of consecutive frames to be interpolated.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

1 is a block diagram schematically illustrating an internal configuration of an interpolation apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the interpolation apparatus 100 includes an input unit 110, a decoding unit 120, and an interpolation unit 130.

The input unit 110 receives the bitstream from the outside and outputs the bitstream to the decoding unit 120. Here, the bitstream is a bit string corresponding to an image encoded by using a frame skipping technique.

The decoding unit 120 decodes the bitstream input through the input unit 110 according to a preset decoding method, and information necessary for interpolation (for example, information about a reference frame, macroblock type, motion vector value, Interpolation frame information, etc.) are obtained and output to the interpolation unit 130.

For example, suppose that the bitstream is encoded with an image corresponding to MPEG-4 simple profile (SP). The decoding unit 120 analyzes the bitstream, extracts a vop_time_increment syntax value, and sets the interpolated frame information. Here, the interpolation frame information is the number of frames to be interpolated. In addition, the decoder 120 may parse the bitstream, extract the mcbpc syntax value, and set the macroblock type. The decoding unit 120 may extract the horizontal_mv_data and vertical_mv_data syntax values and set the motion vector values.

In the present specification, since the bitstream is encoded and decoded using MPEG-4 SP, each syntax is described as vop_time_increment, mcbpc, horizontal_mv_data, and vertical_mv_data. However, when encoding and decoding methods are different, interpolation information is generated. Naturally, the syntax can be different. Since this is obvious to those skilled in the art, further description thereof will be omitted.

The interpolation unit 130 interpolates the frame using the frame decoded through the decoding unit 120 (hereinafter, referred to as a decoded frame as a “reference frame”) for easy understanding and explanation, and interpolation information. In more detail, the interpolation unit 130 interpolates an interpolation target frame using macroblock type and ratio information. Macroblock types are INTRA, INTER, and SKIP. The ratio information is a ratio between a frame to be interpolated (hereinafter referred to as "interpolation target frame" for convenience of understanding and explanation) and reference frames. Hereinafter, in the present specification, for convenience of understanding and explanation, the pixels interpolated in the interpolation target frame will be collectively described as interpolation target pixels.

Hereinafter, the interpolation unit 130 will be described in more detail with reference to FIG. 2.

2 is a block diagram schematically illustrating an internal configuration of an interpolation unit according to an embodiment of the present invention.

Referring to FIG. 2, the interpolation unit 130 includes an information acquisition unit 210, an interpolation processor 220, a pixel padding unit 230, and a controller 240.

The information obtaining unit 210 obtains various information required for frame interpolation from the decoding unit 120 and outputs the various information to the interpolation processing unit 220. In more detail, the information acquisition unit 210 obtains pixel information of the front frame and the rear frame of the interpolation target frame, information of the macroblock of the rear frame, motion vector information, interpolation frame information, and the like, and outputs the information to the interpolation processor 220. .

The interpolation processor 220 determines the position of the interpolation target frame and calculates ratio information of the interpolation target frame by using the interpolation processor 220. For example, assume that interpolation frame information (that is, the number of interpolation target frames) continuously interpolated is four. In addition, suppose that the interpolation target frame interpolated at the present time is the first frame of the interpolation frame information. In this case, the ratio information corresponding to the front frame and the rear frame is 3: 1.

The interpolation processor 220 interpolates an interpolation target frame using ratio information and a macroblock type. The interpolation processor 220 described herein sets the position of the interpolation target pixel based on the macroblock type of the reference frame after the interpolation target frame. The interpolation processor 220 may calculate pixel information of the interpolation target pixel differently according to the macroblock type and ratio information.

In the present specification, the back reference frame refers to a frame before the interpolation target frame based on the time axis. In addition, it is to be understood that the preceding reference frame refers to a frame after the target frame of interpolation.

The interpolation processor 220 scans the macroblocks of the rear reference frames in the set scan line direction and checks the interpolation target frames according to the types of the macroblocks.

Hereinafter, interpolation methods according to types of macroblocks will be described.

(1) Skip Macroblock (SKIP MB)

The interpolation processor 220 interpolates the interpolation target frame using pixel information and ratio information of the front reference frame and the rear reference frame at the same position as the interpolation target frame if the macroblock type of the rear reference frame is the skipped macroblock.

For example, assume that pixel information (ie, pixel value is A) of a previous reference frame and pixel information (ie, pixel value) of a later reference frame are B. Further, suppose that interpolation frame information (that is, the number of frames to be interpolated) is 4, and the interpolation target frame is the first frame among the interpolation frame information.

In this case, the interpolation processor 220 may calculate the pixel value of the corresponding block of the corresponding interpolation frame as follows.

(2) INTRA MB

The interpolation processor 220 records pixel values by using a reference frame adjacent to the interpolation target frame among the previous reference frame and the rear reference frame. The interpolation processor 220 calculates the ratio information and calculates pixel values of the interpolation target frame using the preceding reference frame when the ratio information is less than the threshold. However, if the ratio information is greater than or equal to the threshold value, the interpolation processor 220 calculates a pixel value of the macroblock of the interpolation target frame by using a later reference frame.

For example, assume that pixel information (ie, pixel value is A) of a previous reference frame and pixel information (ie, pixel value) of a later reference frame are B. Further, suppose that interpolation frame information (that is, the number of frames to be interpolated) is 4, and the interpolation target frame is the first frame among the interpolation frame information.

In such a case, the macroblock of the interpolation target frame is calculated using pixel information and ratio information of the previous reference frame.

(3) Inter macroblock (INTER MB)

In the inter macroblock, a motion vector (MV) value exists for each macroblock. The interpolation processor 220 aligns the motion vector values for processing the inter macroblock. For example, the motion vector values may be sorted in ascending or descending order. In the present specification, for convenience of understanding and explanation, it will be described with an emphasis on the interpolation processing unit 220 in order to process motion vector values in ascending order.

In the present specification, the interpolation processor 220 aligns the motion vector values and then processes the macroblocks of the interpolation target frame corresponding to the inter macroblock. Naturally, the alignment process may be omitted.

The interpolation processor 220 may process the target blocks of the interpolation target frame differently according to the inter macroblocks according to the motion vector values.

A) When the motion vector value is the first value

If the motion vector value is the first value, the interpolation processor 220 processes the skipped macroblock at the same position as the pixel position of the later reference frame (that is, the same position of the frame to be interpolated). In the present specification, the first value may be, for example, “0”.

In more detail, when the motion vector value is the first value, the interpolation processor 220 sets the pixel position of the rear reference frame to the position of the target block of the interpolation target frame. The interpolation processor 220 calculates a pixel value of the pixel value of the target block using pixel information and ratio information of the previous reference frame and the rear reference frame.

B) when the motion vector value is not the first value (ie, exceeds the first value).

The interpolation processor 220 sets the position of the target block of the interpolation target frame by using the ratio information on the pixel position of the later reference frame and the motion vector. The interpolation processor 220 calculates pixel values of the target block by using pixel information of a later reference frame, pixel information at a position moved corresponding to the motion vector of the previous reference frame, and ratio information. For this reason, the position of the target block of the interpolation target frame may overlap. In such a case, the interpolation processor 220 may replace the pixel value of the overlapping target block with a pixel value that is calculated and process the same.

For example, assume that the pixel position of the back reference frame is (10, 10) and the pixel value is 200. And, assume that the magnitude of the motion vector of the back reference frame is (4,8). Also assume that the pixel position of the preceding reference frame is (14, 18) and the pixel value is 100. In this case, the position of the target pixel of the interpolation target frame is as follows. Here, assume that the interpolation target frame is the first frame of interpolation frame information (for example, 4) (that is, assume that it is the first frame to be interpolated among four frames to be continuously interpolated).

That is, the position of the target pixel is calculated as (13, 16).

와 같이 산출된다.The pixel value of the target pixel

Is calculated as

As such, the interpolation processor 220 interpolates the interpolation target frame using macroblock type and ratio information.

The pixel padding unit 230 pads the pixels that are not interpolated by the interpolation processor 220. For example, the pixel padding unit 230 scans the interpolation target frame in the scan line direction and pads the target pixel using adjacent neighboring pixel values. If one or more pixels among neighboring pixels (eg, up, down, left, and right) adjacent to the target pixel are interpolated, the target pixel may be padded with an average value of the interpolated pixel values. In this case, in order to prevent errors of the target pixel, the pixel recorded by the padding is not a pixel interpolated by the interpolation processor 220 and thus excluded when calculating the average value of the target pixel.

If the neighboring pixel values adjacent to the target pixel are not all recorded, the padding may be padded using the padded pixel value after the padding process in the scan line direction is completed without padding the corresponding pixel.

The controller 240 controls the internal components of the interpolation unit 130 (eg, the information acquisition unit 210, the interpolation processor 220, the pixel padding unit 230, etc.) according to the embodiment of the present invention. do.

3 is a flowchart illustrating a method for interpolating frames by an interpolation apparatus according to an embodiment of the present invention, and FIGS. 4 to 7 illustrate interpolation target frames according to an embodiment of the present invention. A diagram illustrating a rate strain rate according to an embodiment of the present invention. Hereinafter, since a general video decoding process is obvious to those skilled in the art, a separate description thereof will be omitted. In addition, each step performed below is performed by each internal component of the interpolation apparatus 100, but will be collectively described as an interpolation apparatus for the convenience of understanding and explanation.

In operation 310, the interpolation apparatus 100 obtains information on one or more reference frames and interpolation frame information. The information on the reference frame may be pixel information on the reference frame, information on a macroblock of the reference frame (ie, macroblock type), information on a motion vector, and the like.

In operation 315, the interpolation apparatus 100 calculates ratio information by using the information about the reference frame and the interpolation frame information.

In operation 320, the interpolation apparatus 100 checks the macroblock type of the rear reference frame in the scanline direction.

If the macroblock type is a skipped macroblock, the interpolation apparatus 100 sets the position of the interpolation target pixel of the interpolation target frame to the same position as the position of a later reference frame in step 325.

In operation 330, the interpolation apparatus 100 calculates pixel values of the target pixel by using pixel information and ratio information of the back reference frame and the previous reference frame.

However, if the macroblock type is an intra macroblock, in step 335, the interpolation apparatus 100 sets the position of the target pixel of the interpolation target frame to the same position as that of the later reference frame.

In operation 340, the interpolation apparatus 100 calculates the pixel value of the interpolation target pixel using pixel information of the reference frame adjacent to the interpolation target frame.

For example, if the ratio information is less than the threshold, the interpolation apparatus 100 uses the pixel information of the later reference frame as the pixel value of the target pixel. However, if the ratio information is greater than or equal to the threshold, the interpolation apparatus 100 uses the pixel information of the previous reference frame as the pixel value of the target pixel.

If the result of the check in step 320 is the type of the macroblock is an inter macroblock, the interpolation apparatus 100 sorts the motion vector values according to a preset sorting method in step 345.

In the present specification, for convenience of understanding and explanation, it is assumed that motion vector values are arranged in ascending order. Of course, step 345 may be omitted depending on the implementation.

In operation 350, the interpolation apparatus 100 determines whether the motion vector value is the first value. Here, the first value may be "0". The interpolation apparatus 100 may interpolate the interpolation target frame differently depending on whether the motion vector value is the first value or not.

If the motion vector value is the first value, in step 355, the interpolation apparatus 100 sets the position information of the back reference frame to the position of the target pixel.

In operation 360, the interpolation apparatus 100 calculates pixel values of the target pixel by using pixel information and ratio information of the rear reference frame and the front reference frame.

However, if the motion vector value is not the first value, in step 365, the interpolation apparatus 100 sets the position of the target pixel to the position of the pixel of the later reference frame multiplied by the motion vector value.

In operation 370, the interpolation apparatus 100 calculates a pixel value of a target pixel using pixel information of a later reference frame, pixel information of a pixel position of a position multiplied by a motion vector from a pixel position of a previous reference frame, and ratio information.

In operation 375, the interpolation apparatus 100 scans the interpolation target frame in the scanline direction to pad the uninterpolated pixels.

For example, the interpolation apparatus 100 pads the padding target pixel using adjacent interpolated pixels of the padding target pixel. That is, the interpolation apparatus 100 may pad the padding target pixel by using an average value of interpolated pixels adjacent to the padding target pixel. In this case, in order to prevent an error, the interpolation apparatus 100 may not use the interpolated pixel value when padding. However, when all neighboring pixels adjacent to the padding pixel are not interpolated, the padding pixels may be padded using the padded pixels after the first padding is completed.

4 to 7 illustrate a back reference frame, an interpolated interpolation target frame, and a front reference frame.

8 illustrates a rate-distortion (RD) graph for an Akiyo image. Information about the Akiyo image of FIG. 8 is shown in the following table.

sequence resolution frame threshold MCS Akiyo 352 x 288 300 40 5

As shown in Figure 8, it can be seen that additional compression efficiency can be obtained compared to the MPEG-4 technology.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 is a block diagram schematically showing an internal configuration of an interpolation apparatus according to an embodiment of the present invention.

2 is a block diagram schematically illustrating an internal configuration of an interpolation unit according to an embodiment of the present invention.

3 is a flowchart illustrating a method in which an interpolation apparatus interpolates a frame according to an embodiment of the present invention.

4 to 7 illustrate interpolated interpolation target frames according to an embodiment of the present invention.

8 illustrates a rate strain rate in accordance with an embodiment of the present invention.

Claims (17)

In an interpolation apparatus, A decoder which decodes the input bitstream; An information obtaining unit obtaining one or more of interpolation frame information, at least one reference frame, a macroblock type, and a motion vector value from the decoding unit, wherein the macroblock type is a macroblock type of a later reference frame; And Calculating ratio information of the interpolation target frame using the interpolation frame information; And an interpolation processor configured to interpolate an interpolation target frame using at least one of the ratio information, the pixel information of the reference frame, and the motion vector value according to the macroblock type. According to claim 1, And a pixel padding unit that pads the pixels that are not interpolated by the interpolation processor by using one or more adjacent pixels. According to claim 1, If the macroblock type is a skipped macroblock (SKIP MB), the interpolation processor sets the same position as the pixel position of the back reference frame to the position of the interpolation target pixel of the interpolation target frame, And multiplying the ratio information by the pixel information of the back reference frame and the previous reference frame to calculate a pixel value of the interpolation target pixel. According to claim 1, If the macroblock type is an intra macroblock (INTRA MB), the interpolation processor sets the pixel position of the rear reference frame to the position of the interpolation target pixel of the interpolation target frame, And a pixel value of the interpolation target pixel is set by using pixel information of a frame adjacent to the interpolation target frame among the rear reference frame and the front reference frame. According to claim 1, And the interpolation processor interpolates an interpolation target frame differently according to the motion vector value when the macroblock type is an INTER MB. 6. The method of claim 5, The interpolation processor, when the macroblock type is an INTER MB, sets the moved position by multiplying the motion vector value by the ratio information at the pixel position of the later reference frame as the position of the interpolation target pixel. And calculating pixel values of the interpolation target pixel by multiplying pixel information of the rear reference frame and pixel positions of the previous reference frame by the motion vector value by the ratio information. Interpolation device. According to claim 1, And the pixel padding unit pads the non-interpolated pixels using an average value of at least one adjacent interpolated pixel value. According to claim 1, The interpolation frame information is the number of frames to be interpolated. In the interpolation apparatus interpolated skipped frame, Decoding the input bitstream to obtain one or more of interpolated frame information, one or more reference frames, a macroblock type, and a motion vector value; Calculating ratio information of an interpolation target frame using the interpolation frame information; And And interpolating the interpolation target frame differently using at least one of the reference frame, the motion vector value, and the ratio information according to the macroblock type. The method of claim 9, After interpolating the interpolation target frame, Scanning the interpolation target frame in a set scanline direction and padding the uninterpolated pixel using one or more adjacent interpolated pixels. The method of claim 10, Padding using the interpolated pixels, And padding the uninterpolated pixel using an average value of one or more adjacent interpolated pixels. The method of claim 9, The macroblock type is a macroblock type of a later reference frame. And a skip macroblock (SKIP MB), an intra macroblock (INTRA MB), or an inter macroblock (INTER MB). The method of claim 12, If the macroblock type is the skipped macroblock, interpolating the interpolation target frame may include: Setting a pixel position of the back reference frame as a position of an interpolation target pixel of the interpolation target frame; And And multiplying the ratio information by the pixel information of the back reference frame and the previous reference frame to calculate a pixel value of the interpolation target pixel. The method of claim 12, If the macroblock type is the intra macroblock, interpolating the interpolation target frame may include: Setting a pixel position of the back reference frame as an interpolation target pixel position of the interpolation target frame; And And a pixel value of the interpolation target pixel is calculated by using pixel information of a reference frame adjacent to the interpolation target frame among the back reference frame and the previous reference frame. The method of claim 12, If the macroblock type is the inter macroblock, interpolating the interpolation target frame may include: Setting the moved position by multiplying the motion vector value by the ratio information at the pixel position of the later reference frame as the position of the interpolation target pixel of the interpolation target frame; And And calculating the pixel value of the pixel to be interpolated by multiplying the ratio information by the pixel information of the moved position by multiplying the motion vector value by the ratio information at the pixel position of the rear reference frame and the pixel position of the preceding reference frame. Frame interpolation method characterized in that. The method of claim 9, The interpolation frame information is the number of interpolation target frames to be interpolated. In the recording medium recording a program that can be read by the digital processing device is implemented tangibly implemented by the digital processing device for interpolating the skipped frame, Decoding the input bitstream to obtain one or more of interpolated frame information, one or more reference frames, a macroblock type, and a motion vector value; Calculating ratio information of an interpolation target frame using the interpolation frame information; And And interpolating the interpolation target frame differently using at least one of the reference frame, the motion vector value, and the ratio information according to the macroblock type.

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