KR101477772B1 - Computer readable redording meduim having recorded a computer program for executing a video decoding method using bit depth increasing - Google Patents

Abstract

There is provided a computer-readable recording medium having recorded thereon a program for executing a decoding method through an increase in bit depth. The program comprising the steps of: checking the bit depth of the input signal; increasing the bit depth of the input signal if the bit depth of the input signal is less than the bit depth of the original signal; And reconstructing the image using the increased input signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a computer readable recording medium on which a program for executing a decoding method through an increase in bit depth is recorded.

Embodiments of the present invention relate to a method and apparatus for encoding and decoding.

The present invention has been derived from research carried out as part of the IT source technology development project of the Ministry of Knowledge Economy and the Korea Information Society Agency. [Assignment number: 2008-F-011-01, Title: Ultra high quality TV and high efficiency video codec technology Development].

Generally, a moving image encoding method receives input information of 8, 10, or 12 bit depth for each fixed brightness and color component, and performs encoding and decoding at the corresponding bit depth.

For example, in the case of H.264 / AVC, the baseline profile can perform encoding and decoding on the original signal of 8 bits (bit depth), and the high profile 10 It is possible to perform encoding and decoding on the original signal of 10 bits or more.

One embodiment of the present invention reduces the bit depth of each brightness and color component in the encoding of video. It is an object of the present invention to improve the coding efficiency and reduce the system complexity by preventing the bit depths from being encoded more than necessary by adaptively selecting the slice or macroblock.

According to another aspect of the present invention, there is provided a computer-readable recording medium having recorded thereon a program for executing a decoding method through an increase in bit depth, the program comprising the steps of: checking a bit depth of an input signal; Increasing the bit depth of the input signal if the bit depth of the input signal is less than the bit depth of the original signal, and recovering the image using the increased input bit depth.
If the bit depth of the input signal is less than the bit depth of the original signal, the bit depth of the input signal is shifted to the left by the difference between the bit depth of the original signal and the bit depth of the input signal .
The bit depth of the input signal may include at least one of a bit depth for a brightness component (luma) of the input signal and a bit depth for a color component (chroma) of the input signal.
The bit depth of the input signal can be increased by using a mapping table in which the bit depth values of the plurality of signals are stored when the bit depth of the input signal is smaller than the bit depth of the original signal.
The bit depth of the increased input signal may be the same as the bit depth of the original signal.
The input signal may be a video signal input to the encoder.

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According to an embodiment of the present invention, a bit depth of each brightness and color component is reduced in encoding a video, and a bit depth reduction is adaptively selected and performed in units of slices or macroblocks, The coding efficiency can be improved and the system complexity can be reduced.

1 is a configuration diagram of an encoding apparatus according to an embodiment of the present invention.
2 is a configuration diagram of an encoding apparatus according to another embodiment of the present invention.
3 is a block diagram of a decoding apparatus according to an embodiment of the present invention.
4 is a block diagram of a decoding apparatus according to another embodiment of the present invention.
5 is a flowchart illustrating an encoding method according to an embodiment of the present invention.
6 is a flowchart illustrating a coding method according to another embodiment of the present invention.
7 is a flowchart illustrating a decoding method according to an embodiment of the present invention.
8 is a flowchart illustrating a decoding method according to another embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 is a configuration diagram of an encoding apparatus according to an embodiment of the present invention. The configuration of an encoding apparatus according to an embodiment of the present invention will be described with reference to FIG.

The encoding apparatus according to an embodiment of the present invention includes a bit depth adjustment unit 110, a bit depth reduction unit 120, a bit depth quantization unit 130, and a bit depth increasing unit 140.

The bit depth adjustment unit 110 determines whether to reduce the bit depth of the input signal.

The bit depth of each brightness and color component may be used for the bit depth of an embodiment of the present invention.

At this time, although the bit depth adjustment unit 110 reduces the bit depth, there is little reduction in the coding efficiency, and the bit depth adjustment unit 110 may have an advantage of the complexity. Alternatively, the bit depth adjustment unit 110 may reduce the bit depth of the corresponding block or slice, It is possible to determine that the bit depth is reduced when the coding efficiency can be increased in the entire sequence by allowing the bits to be allocated.

When the bit depth adjustment unit 110 determines that the bit depth is to be reduced, the bit depth reduction unit 120 reduces the bit depth of the input signal.

At this time, the bit depth reduction unit 120 shifts the bit depth of the input signal by a predetermined amount to the right direction and reduces the bit depth, or uses a mapping table in which bit depth values of a plurality of signals are stored So that the bit depth of the input signal can be reduced.

At this time, the bit depth reduction unit 120 may include a bit depth adjustment unit 110 to determine whether to reduce the bit depth.

The bit depth quantization unit 130 quantizes the input signal.

The bit depth increasing unit 140 increases the bit depth of the input signal.

At this time, the bit depth increasing unit 140 shifts the bit depth of the input signal to the left by a predetermined value, or increases the bit depth of the input signal by using a mapping table in which bit depth values of a plurality of signals are stored So that the bit depth of the input signal can be increased.

Hereinafter, an example of an input signal in which the bit depth of each brightness and color component is M-bit depth will be described.

According to an embodiment of the present invention, a H.264 / AVC encoder is provided with a bit depth control unit 110, a bit depth decreasing unit 120, and a bit depth increasing unit 120, 140).

The bit depth adjustment unit 110 may control the adaptive bit depth reduction unit 120 and the bit depth increasing unit 140 described above. More specifically, the bit depth adjustment unit 110 controls the adaptive bit depth reduction unit 120 to adjust whether the bit depth is to be reduced or not, and controls the bit depth increasing unit 140 It is possible to determine whether to increase the bit depth.

The bit depth reduction unit 120 can reduce the bit depth to N in a slice or block unit when the sample bit depth of the input signal is M bits. The bit depth N may be determined by a predetermined method.

More specifically, the bit depth adjuster 110 obtains a difference between an M-bit input signal having an M-bit depth and an M-bit reference signal having an M-bit depth to obtain a residual signal, And determine whether to decrease the bit depth of the residual signal.

When the bit depth adjustment unit 110 determines that the bit depth is to be reduced, the bit depth reduction unit 120 converts the residual signal of M-bit depth into a signal of N-bit depth.

For example, the bit depth reduction unit 120 may shift the input signal of M-bit depth by a to the right to obtain a signal of N-bit depth. At this time, N <M, M = N + α, and M, N, and α are positive integers.

Alternatively, the bit depth reduction unit 120 may preliminarily define a value of N-bit depth corresponding to the value of the M-bit depth as a mapping table, and determine a value of the M-bit depth input using the mapping table The value of N-bit depth can be selected according to the number of bits.

The N-bit depth quantization unit 130 can provide the N-bit depth signal generated by the bit depth reduction unit 120 to the N-bit depth quantization unit 130. On the other hand, when the bit depth is not reduced, a signal of M-bit depth corresponding to the bit depth of the input signal can be provided to the M-bit depth quantization unit 130 side.

The bit depth quantization unit 130 quantizes the input signal.

The bit depth increasing unit 140 may increase the bit depth so that the reduced bit depth during the decoding process in the encoder becomes equal to the bit depth of the original signal. Therefore, the signal reduced in N-bit depth can be output as a signal having the M-bit depth equal to the bit depth of the input signal sample, and the decoded information having the M-bit depth can be utilized as the reference signal for the next frame.

In more detail, the bit depth increasing unit 140 may increase the bit depth according to the bit depth of the signal input to the bit depth increasing unit 140.

That is, the bit depth adjustment unit 110 measures the bit depth of the input signal. By the determination and control of the bit depth adjustment unit 110, the bit depth increasing unit 140 determines that the bit depth of the input signal is equal to the M bit If the bit depth is N-bit depth, the N-bit depth can be increased to M-bit depth by adding a number of bits.

At this time, the bit depth increasing unit 140 shifts leftward by? To add? Bits and add? To output a signal having the same M-bit depth as the original signal.

Embodiments of the method for selecting? Will be described in more detail.

In one embodiment, the value indicated by? Is added to the least significant bit by cutting the intermediate value (=? / 2) of the cut bits, i.e., 2 The average error due to the increase and decrease of the depth can be minimized.

As another embodiment,? Can be replaced by one of the predefined values according to the encoding characteristic. That is, it can be defined as? = 1 (102 decimal numbers) in the case of an intra-coded block and? = 0 (002 decimals) when inter-picture coding is performed.

As another embodiment, a value of M-bit depth corresponding to a value of N-bit depth may be defined in advance as a mapping table, and a value of M-bit depth may be calculated according to a value of N-bit depth input using the mapping table It can also be obtained.

Accordingly, the bit depth increasing unit 140 can increase the bit depth according to the bit depth of the input signal.

2 is a configuration diagram of an encoding apparatus according to another embodiment of the present invention. The configuration of an encoding apparatus according to another embodiment of the present invention will be described with reference to FIG.

The encoding apparatus according to another embodiment of the present invention includes a bit depth adjustment unit 210, a bit depth quantization unit 220, and a bit depth inverse quantization unit 230.

The embodiment shown in FIG. 2 differs from the embodiment shown in FIG. 1 in that the frequency transform and the scaling are operated at the same bit depth as the original signal to suppress the loss of information as much as possible, This is for adjusting the bit depth in the quantization process.

The bit depth adjustment unit 210 determines whether to reduce the bit depth of the input signal.

When the bit depth adjustment unit 210 determines that the bit depth is to be reduced, the bit depth quantization unit 220 reduces the bit depth of the input signal to a predetermined value and quantizes the bit depth.

The bit depth inverse quantization unit 230 increases the bit depth of the input signal to a predetermined value and inverse-quantizes the bit depth.

For example, the bit depth quantization unit 220 may quantize the value of M-bit depth to a value of M or N-bit depth by adjusting the bit depth adjustment unit 210, and the bit depth dequantization unit 230 may quantize Contrary to the depth quantization unit 220, it is possible to dequantize a signal of M or N-bit depth to a value of M-bit depth under the control of the bit depth adjustment unit 210. [

The bit depth adjuster 210 may determine whether to reduce the bit depth for a signal transformed and scaled by M that is the same bit depth as the input.

In accordance with the determination of the bit depth adjustment unit 210, the bit depth quantization unit 220 performs quantization for performing an output reduced to N-bit depth with respect to the M-bit depth input, or performs quantization for performing M- Quantization can be performed.

The bit depth inverse quantization unit 230 may increase the bit depth reduced by N to a depth of M bits equal to the bit depth of the original signal when the bit depth is reduced in the bit depth quantization unit 220, In the case of a signal having a depth of M bits, inverse quantization can be performed without increasing the bit depth.

3 is a block diagram of a decoding apparatus according to an embodiment of the present invention. A decoding apparatus according to an embodiment of the present invention will be described with reference to FIG.

The decoding apparatus according to an embodiment of the present invention includes a bit depth adjusting unit 310 and a bit depth increasing unit 320.

The bit depth adjustment unit 310 determines whether the bit depth of the input signal is reduced.

When the bit depth adjustment unit 310 determines that the bit depth is reduced, the bit depth increasing unit 320 increases the bit depth of the input signal.

At this time, the bit depth increasing unit 320 shifts the bit depth of the input signal to the left by a predetermined value, or increases the bit depth of the input signal, or a mapping table storing the bit depth values of the plurality of signals The bit depth of the input signal can be increased.

That is, the bit depth adjustment unit 310 measures the bit depth of the input signal. When the bit depth increasing unit 320 determines that the bit depth of the input signal is the same as the original signal, If the bit depth is N-bit depth, the N-bit depth can be increased to M-bit depth by adding a number of bits.

At this time, the bit depth increasing unit 320 shifts leftward by? To add? Bits and add? To output a signal having the same M-bit depth as that of the original signal.

Embodiments of the method for selecting? Will be described in more detail.

In one embodiment, the value indicated by? Is added to the least significant bit by cutting the intermediate value (=? / 2) of the cut bits, i.e., 2 The average error due to the increase and decrease of the depth can be minimized.

As another embodiment,? Can be replaced by one of the predefined values according to the encoding characteristic. That is, it can be defined as? = 1 (102 decimal numbers) in the case of an intra-coded block and? = 0 (002 decimals) when inter-picture coding is performed.

As another embodiment, a value of M-bit depth corresponding to a value of N-bit depth may be defined in advance as a mapping table, and a value of M-bit depth may be calculated according to a value of N-bit depth input using the mapping table It can also be obtained. At this time, the mapping table may be defined in advance in the encoding apparatus and the decoding apparatus, or may be additionally transmitted together with a bitstream.

That is, according to an embodiment of the present invention, a tone-mapping table (table information) for table information for mapping an 8 bit value to a 10 bit value, ton-mapping table information, or by transmitting information about a specific value as additional information, the bit depth can be added to a value close to the original image.

4 is a block diagram of a decoding apparatus according to another embodiment of the present invention. A decoding apparatus according to another embodiment of the present invention will be described with reference to FIG.

The decoding apparatus according to another embodiment of the present invention includes a bit depth adjustment unit 410 and a bit depth inverse quantization unit 420.

The bit depth adjuster 410 determines whether the bit depth of the input signal is reduced.

When the bit depth adjustment unit 410 determines that the bit depth is reduced, the bit depth inverse quantization unit 420 increases the bit depth of the input signal to a predetermined value and inverse-quantizes the bit depth.

For example, the bit depth dequantization unit 420 determines whether or not the bit depth of the input signal in the bit depth adjustment unit 410 is reduced, The M-bit depth can be increased to the same depth as the depth, and in the case of the signal having the M-bit depth not reduced, the inverse quantization can be performed without increasing the bit depth.

Accordingly, according to an embodiment of the present invention, in the encoding of video, the bit depth of each brightness and color component is reduced, and the bit depth is reduced by adaptively selecting in units of slices or macroblocks , The coding efficiency is improved and the system complexity can be reduced by preventing coding at a bit depth more than necessary.

5 is a flowchart illustrating an encoding method according to an embodiment of the present invention.

According to the encoding method of the embodiment of the present invention, it is determined whether the bit depth of the input signal is reduced by the encoding apparatus (S510).

At this time, even if the bit depth is reduced, the coding apparatus can not reduce the coding efficiency and have the advantage of complexity, or can reduce the bit depth of the corresponding block or slice and allocate more bits to another block or slice So that it is possible to determine that the bit depth is reduced when the encoding efficiency of the entire sequence can be increased.

If the encoding apparatus determines to decrease the bit depth, the bit depth of the input signal is decreased (S520).

At this time, the encoding device shifts the bit depth of the input signal to the right by a predetermined value to reduce the bit depth, or uses a mapping table in which bit depth values of a plurality of signals are stored, The bit depth of the signal can be reduced.

Thereafter, the encoding apparatus quantizes the input signal (S530).

Thereafter, the encoding apparatus increases the bit depth of the input signal (S540).

At this time, the encoding device shifts the bit depth of the input signal to the left by a predetermined value, or increases the bit depth of the input signal by using a mapping table in which bit depth values of a plurality of signals are stored, The bit depth of the signal can be increased.

Meanwhile, if the encoding device does not determine to decrease the bit depth, the encoding device quantizes the input signal without decreasing the bit depth of the input signal (S550).

6 is a flowchart illustrating a coding method according to another embodiment of the present invention.

According to another exemplary embodiment of the present invention, the encoder determines whether the bit depth adjustment unit is to reduce the bit depth of the input signal (S610).

If it is determined that the bit depth is to be decreased, the encoding apparatus reduces the bit depth of the input signal to a predetermined value and quantizes the bit depth (S620).

Thereafter, the encoding apparatus increases the bit depth of the input signal to a predetermined value and dequantizes the bit depth (S630).

On the other hand, if it is determined that the bit depth is to be reduced, the encoder quantizes the input signal without decreasing the bit depth, and then dequantizes the input signal (S640, S650).

7 is a flowchart illustrating a decoding method according to an embodiment of the present invention.

According to the decoding method according to the embodiment of the present invention, the decoding apparatus determines whether the bit depth of the input signal is reduced (S710).

If the decoding apparatus determines that the bit depth is reduced, the bit depth increasing unit increases the bit depth of the input signal (S720).

At this time, the decoding apparatus shifts the bit depth of the input signal to the left by a predetermined value, or increases the bit depth of the input signal by using a mapping table in which bit depth values of a plurality of signals are stored, The bit depth of the input signal can be increased.

That is, the decoding device measures the bit depth of the input signal and, if the bit depth of the input signal is the same as the original signal, passes through only if the depth of the input signal is the M-bit depth by the determination and control of the bit depth adjusting unit, The N-bit depth can be increased to M-bit depth by adding as many as? Bits.

8 is a flowchart illustrating a decoding method according to another embodiment of the present invention.

According to the decoding method according to another embodiment of the present invention, the decoding apparatus determines whether the bit depth of the input signal is reduced (S810).

If the decoding apparatus determines that the bit depth is reduced, the bit depth of the input signal is increased to a predetermined value and dequantized (S820).

On the other hand, if it is determined that the bit depth is not reduced, the decoding apparatus quantizes the input signal without increasing the input signal (S830).

For example, if the decoding apparatus determines that the bit depth of the input signal is reduced and controls accordingly, the bit depth reduced by N can be increased to the same M-bit depth as the bit depth of the original signal, In the case of a signal that is not M-bit depth, it can be inverse-quantized without increasing the bit depth.

The embodiments of the present invention as described above can be implemented as a computer-executable code (program) on a computer-readable recording medium. In addition, the computer-readable recording medium may include any type of recording device in which data that can be read by a computer system is stored. Examples of such computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, carrier wave (e.g., transmission over the Internet) and the like.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

110: Bit depth adjustment unit
120: bit depth reduction unit
130: bit depth quantization unit
140: bit depth increasing part

Claims (6)

A computer-readable recording medium having recorded thereon a program for executing a decoding method through a bit depth increase,
The program includes:
Identifying a bit depth of an input signal;
Increasing the bit depth of the input signal if the bit depth of the input signal is less than the bit depth of the original signal; And
Reconstructing an image using the input signal with the increased bit depth; And
And determining whether to perform a deblocking filter on the restored image. The method according to claim 1,
If the bit depth of the input signal is less than the bit depth of the original signal,
And shifts the bit depth of the input signal to the left by a difference between the bit depth of the original signal and the bit depth of the input signal. The method according to claim 1,
Wherein the bit depth of the input signal,
A bit depth for a brightness component (luma) of the input signal, and a bit depth for a color component (chroma) of the input signal. The method according to claim 1,
If the bit depth of the input signal is less than the bit depth of the original signal,
Wherein a bit depth of the input signal is increased by using a mapping table in which bit depth values of a plurality of signals are stored. The method according to claim 1,
Wherein the bit depth of the increased input signal is the same as the bit depth of the original signal. The method according to claim 1,
Wherein the input signal is a video signal input to an encoder.

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