KR100322594B1 - Method for representing encoding upon coding video information - Google Patents

Abstract

The present invention relates to a video information coding method, and to a method for displaying whether a video is encoded by expanding a video information field of a block. The present invention utilizes an encoding presence display method through an extension of an encoding presence display information field in an error-tolerant mode, and reduces a bit amount according to characteristics of encoded image information. The present invention extends the COD field used in H.263 and MPEG-4 to encode an image by indicating that both MV and DCT are not encoded, that both MV and DCT are encoded, and that only MV is encoded. It is possible to use the error-allowed mode in the channel in which an error exists and to reduce the amount of bits when encoding the image information under the background where the motion of the image is constant.

Description

Method for representing encoding upon coding video information}

The present invention relates to a video information coding method, and more particularly, to a method for displaying whether a video is encoded through expansion of a video information field of a block. Furthermore, the present invention relates to an image bit amount reduction method that utilizes a method for displaying an encoding state through an extension of an encoding field display information field in an error-tolerant mode and reduces the amount of bits according to characteristics of encoded image information.

In general, in the case of block-based codec, object-based codec, and shape-based codec, the technique mainly used in the video encoding method is the most similar to the current block in the previous frame to encode a block. Data is generated by encoding a motion vector representing a motion vector and a real value or a transformed (for example, DCT) value with respect to a difference between the actual data.

H.263 and MPEG-4 use the "COD (code) field" to indicate the encoding of these two characteristic values in the bit stream.

1 is a conceptual diagram illustrating a method of indicating whether a general bit stream is encoded.

As shown in FIG. 1, the presence or absence of encoding of a motion vector and a DCT coefficient is represented by a 1-bit value of a COD field. That is, if the bit of the COD field is "0", this indicates that MV and DCT are encoded, and "1" indicates that MV and DCT are not encoded.

However, when using this COD field to indicate whether a block is encoded or not, this information is expressed by only 1 bit, so when used in a channel where an error exists, it is easy to misinterpret the entire information by only this 1 bit error. .

In addition, in the case of video motion under a constant background, only a motion vector (MV) is required in actual encoding and a difference value (DCT) is not necessary. However, in the conventional case, this difference value (DCT) is also encoded, thereby increasing the amount of bits.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method of encoding and displaying image information when encoding an image information which may prevent erroneous interpretation when image information is transmitted in a channel having an error by extending a "COD" field.

Another object of the present invention is to provide a method of encoding and displaying video information by extending a "COD" field to generate data encoded in a smaller amount than conventional information on information with constant motion of an image.

1 is a conceptual diagram illustrating a method of indicating whether a general bit stream is encoded.

2 is a conceptual diagram illustrating a method for indicating whether a bit stream is encoded according to the present invention.

In order to achieve the above technical problem, the present invention extends the COD field in encoding information display method of image information so that both MV and DCT are not encoded, both MV and DCT are encoded, and only MV is encoded. The present invention provides a coding and display method for coding video information, wherein the video is encoded.

Preferably, the extended COD field is at least 2 bits.

Preferably, the extended COD field is used in the H.263 or MPEG-4 coding standard.

Preferably, the COD field indicates that both MVs and DCTs are not encoded when the bit is "11", and that both MVs and DCTs are encoded when "00", and only MV is encoded when "01". It is characterized by the fact that it is.

Preferably, when used in a channel in which an error exists, only two values of "00" and "11" are used in the error tolerance mode.

Preferably, when the packetized data is divided and transmitted in the error-tolerant mode, the original COD is not transmitted, and the number of " 1 " of the CODs in the packet is encoded by VLC and transmitted before COD. When the codes are all "00", "0" is transmitted in the case of all "11", and in the case of the remaining combinations, the original codes of VLC and COD are transmitted as they are.

Preferably, the information is encoded using only the MV under a background in which the motion of the image is constant.

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

2 is a conceptual diagram illustrating a method for indicating whether a bit stream is encoded according to the present invention.

As shown in FIG. 2, by extending one bit of the COD field, the possibility of decoding the wrong COD information is reduced, and coding is performed in a smaller amount than that of the image that can sufficiently express the information using only the motion vector. To generate generated data. That is, the COD field not only indicates whether two representative values are encoded, but also includes a case where only a motion vector is required. For this purpose, the COD field is tabulated into 2 bits. That is, when 2 bits is "11", it means that both MV and DCT are not encoded. When "00", it means that both MV and DCT are encoded. When "01", it means that only MV is encoded. . Here, the case of "10" is not defined, but may indicate that only DCT is encoded.

Through the expression of COD, only two values of "00" and "11" are used when the video codec is encoded in the error tolerant mode to prevent incorrect transmission of "01". This reduces the likelihood of misinterpretation in the presence of an error channel, as opposed to representing COD in 1 bit.

In addition, in the case of transmitting the divided packetized data in the error tolerant mode, it can be used in the following way. That is, the number of " 1 " of the COD in the packet is encoded by VLC and transmitted before the COD. In this case, when all of the combined code is "00", "0" is transmitted when all "0" is "11", and the original COD is not transmitted. The remaining combinations transmit the original codes of VLC and COD. This expansion of the COD's information field makes it more robust to error-tolerant modes.

The present invention is not limited to the above-described embodiment, and of course, modifications may be made by those skilled in the art within the spirit of the present invention. For example, it is apparent to those skilled in the art that the bit of the COD field may be 2 or more bits in the encoding display method when coding the image information of the present invention. In addition, since the problem of determining a channel in which an error applied to the encoding display method is applied when coding the image information of the present invention and determining that the motion of the image is performed under a constant background is obvious to those skilled in the art, a detailed description thereof is omitted.

As described above, according to the present invention, by extending the COD field, a channel having an error can be used in an error-tolerant mode, and a bit amount can be reduced when encoding image information under a background where a motion of the image is constant.

Claims (7)

In the encoding display method for coding bit stream image information having a motion vector (MV) representing a portion most similar to a current block in a previous frame and a difference value (DCT) of its actual data to encode an image, Encoding during video information coding by extending the COD field used in the bitstream to indicate that both MV and DCT are not encoded, that both MV and DCT are encoded, and that only MV is encoded. Display method. The method of claim 1, wherein the extended COD field is at least 2 bits. The method of claim 1, wherein the extended COD field is used in an H.263 or MPEG-4 encoding standard. The method according to claim 2, wherein if the COD field is 2 bits, it means that both MV and DCT are not coded when the bit is "11", and that both MV and DCT are coded when "00". 01 ", the encoding display method when coding image information, characterized in that only MV is encoded. The encoding display method of claim 4, wherein when used in a channel in which an error exists, only two values of "00" and "11" are used in the error tolerance mode. The method of claim 5, wherein when the packetized data is divided and transmitted in the error tolerant mode, the original COD is not transmitted, and the number of " 1 " of CODs in the packet is encoded by VLC and transmitted before COD. In this case, when the combined codes are all "00", "0" is transmitted in the case of all "11", "1" is transmitted, and in the other combination, the original code of VLC and COD is transmitted as it is. Coded display method when coding information. The encoding display method of claim 4, wherein the information is encoded using only the MV using a value of "01" under a background in which the motion of the image is constant.