JP3353939B2 - Image decoding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIG. 11) Problems to be Solved by the Invention (FIG. 11) Means for Solving the Problems (FIGS. 1 to 7) Operation (FIGS. 1 to 7) Example (FIG. 1) 10) Effect of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image coding apparatus,
For example, the present invention is suitably applied to an image coding apparatus such as a digital video tape recorder (DVTR) that compresses and records an information amount by performing a discrete cosine (DCT) conversion on a video signal.

[0003]

2. Description of the Related Art Conventionally, there is a DVTR of this type as shown in FIG. That is, in FIG. 11, 1 indicates a DVTR as a whole, and a digital video signal S1 input from a predetermined video signal generation unit
Is input to The shearing circuit 2 cuts out the digital video data input as the digital video signal S1 into DCT blocks of 8 columns × 4 rows for each field,
This DCT block is moved from a position distant from the screen.
DCT that collects 10 blocks and continues as shear data S2
It is sent to the conversion circuit 3.

[0004] The DCT transform circuit 3 performs a discrete cosine transform on the data of each DCT block, and sends this to the subsequent quantization circuit 4 as DCT data S3. The quantization circuit 4 checks the quantization level for realizing the target compression rate based on the data length information S5 fed back from the variable length coding circuit 5, and based on the quantization level, determines the D level.
The amount of information is compressed by quantizing the CT data S3, and the compressed data is sent to the subsequent variable length coding circuit 5 as quantized data S4. The variable-length coding circuit 5 performs variable-length coding on the quantized data S4 to generate variable-length code data S6 having a block length defined in the format, and sends it to the correction code circuit 6.

[0005] The correction code circuit 6 generates an error-correcting outer code for correcting a burst-like error and an error-correcting inner code for correcting a random error, and appends these to the recording data. S7 is obtained, and this is recorded on the magnetic tape 8 via the magnetic head 7 provided on the rotating drum.

In a reproducing system, reproduced data S8 reproduced through a reproducing head 9 is input to a correction circuit 10, where the data is corrected using an error correction code recorded together with the recording data, and the resulting data is subjected to variable processing. It is sent to the long decoding circuit 11. The variable-length decoding circuit 11 obtains the variable-length decoded data S10 from the reproduction data S8, sends it to the inverse quantization circuit 12, performs an inverse quantization process, and sends the inverse-quantized data S11 to the IDCT circuit. Thus, the inverse transform processing for the discrete cosine transform in the DCT transform circuit 3 is performed. IDCT obtained in this way
By sending the data S12 to the following descripple circuit 14, the DCT-blocked data is arranged in the scanning order and output as reproduced digital video data S13.

[0007]

In the DVTR 1 having such a structure, the reproduced digital video data S13 output from the desiccure circuit 14 is input to a predetermined interpolation circuit (not shown), and the head of the interpolation digital circuit is used in the DVTR 1. Pixels in which errors have occurred due to clogging or scratches on the magnetic tape 8 are corrected.

In this case, a method of detecting a field difference or a frame difference of pixel data and interpolating a pixel in which the error has occurred is used. In the interpolation processing, a stationary portion of an image is visually recognized. While it is possible to perform interpolation without a sense of incongruity, it is difficult to perform interpolation within a visually sufficient range for a fast-moving portion.

The present invention has been made in view of the above points, and an image encoding apparatus capable of detecting the presence or absence of a motion of a pixel to be interpolated and performing an interpolation process according to the presence or absence of the motion. It is intended to propose.

[0010]

According to the present invention, there is provided an image decoding apparatus which receives encoded information obtained by encoding image information via a transmission line and decodes the encoded information. Detecting means 35 for detecting whether or not a transmission line error has occurred for the pixel of the coded information
The presence or absence of the motion of the pixel B in the current frame PFR0 in which the transmission path error has occurred is determined by the current frame PFR0.
, A frame difference motion presence / absence detecting means 35 for detecting based on pixel information around the pixel B and pixel information around a pixel Y corresponding to one of the frames PFR1 before and after the current frame PFR0, The presence / absence of the movement of the pixel B in the current field PFL0 in which the occurrence has occurred is determined based on the pixel information around the pixel B in the current field PFL0 and the vicinity of the corresponding pixel in the field PFL1 which is either before or after the current field PFL0. When the motion of the pixel B is detected to be present by the field difference motion presence / absence detection means 46 and the frame difference motion presence / absence detection means 35 which are detected based on the pixel information, the motion of the pixel B when the transmission path error occurs is detected. Based on the pixel information of the surrounding pixels in the included field, The pixel B for which the report is missing is interpolated, and when it is detected that there is no motion of the pixel B, the pixel is interpolated based on the previous frame data. Even when the presence / absence cannot be detected, if the motion of the pixel B is detected by the field difference motion presence / absence detecting means 46, the vicinity of the current field including the pixel B when the transmission path error occurs is included. Pixel B whose information is missing due to a transmission path error based on the pixel information of the pixel
And the interpolation means 22 for interpolating the pixel B based on the previous field data when it is detected that the pixel B does not move.

In the present invention, if the interpolation means 22 cannot detect the presence or absence of the movement of the pixel B by both the frame difference movement presence / absence detection means 35 and the field difference movement presence / absence detection means 46, the transmission path The pixel B is interpolated based on data one field before the current field including the pixel B in which the error has occurred.

Further, in the present invention, the interpolation means 22 interpolates the pixel B based on the data two fields before when the interpolation cannot be performed based on the data one field before.

Further, in the present invention, when interpolation cannot be performed based on data two fields before, the interpolation means 22 replaces the pixel B in which the error has occurred with gray level data to interpolate the pixel B. .

[0014]

[0015]

[0016]

From the state in which a transmission path error has actually occurred, the presence or absence of movement of the pixel B in which the transmission path error has occurred is determined by either the inter-frame difference processing or the inter-field difference processing based on peripheral pixel information. When the pixel B is detected and the presence or absence of the motion of the pixel B is detected by the inter-frame difference processing, the optimum interpolation is performed on the pixel B according to the presence or absence of the motion. Even if the presence / absence of the movement of the pixel B cannot be detected, if the presence / absence of the movement of the pixel B can be detected by the inter-field difference processing, the optimum interpolation corresponding to the presence / absence of the movement of the pixel B is executed. As a result, every time a transmission path error occurs, the detection of the presence or absence of the movement of the pixel B by the inter-frame difference processing or the inter-field difference processing is sequentially performed, and based on the detection result, the corresponding image is detected. It is possible to perform an optimum interpolation according to the presence or absence of the motion of B efficiently, it is possible to restore an image without visually uncomfortable feeling.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1, in which parts corresponding to those in FIG. 11 are denoted by the same reference numerals, the DVTR 20 sends the reproduced digital video data S13 output from the desire circuit 14 to the motion presence / absence detection circuit 21 and the interpolation circuit 22.

Here, the motion presence / absence detection circuit 21 comprises a motion presence / absence detection unit 30 based on a frame difference shown in FIG. 2 and a motion presence / absence detection unit 40 based on a field difference shown in FIG. That is, in FIG. 2, the motion presence / absence detection unit 30 based on the frame difference obtains delayed data S32 obtained by sequentially delaying the reproduced digital video data S13 by one frame for each field via the field memories 31 and 32, and calculates the absolute value thereof. Input to the circuit 33.

The absolute value calculating circuit 33 directly inputs the reproduced digital video data S13, thereby obtaining the delay data S32 and the reproduced digital video data S13.
Then, the difference between the reproduced digital video data S13 and the pixel data (delayed data S32) one frame before the reproduced digital video data S13 is calculated, and the calculated difference is sent to the comparison circuit 34 as frame difference data S33.

The comparison circuit 34 generates frame difference data S33
Is compared with a preset threshold value, and the comparison result is sent to the determination circuit 35 as comparison data S34. Discrimination circuit 3
5 is based on the comparison data S34, when the frame difference data S33 exceeds the threshold value, it is determined that the pixel has a motion, and when the frame difference data S33 does not exceed the threshold value, it is determined that the pixel has no motion (ie, still). .

At the same time, the motion presence / absence detecting section 30 based on the frame difference outputs the reproduced digital video data S
The delay data S36 is obtained by delaying the error flag inputted together with the data 13 together with the error flag one frame at a time via the field memories 36 and 37 by one frame.
36 is input to the discriminating circuit 35 together with an error flag input together with the reproduced digital video data S13 at this time.

Accordingly, the discriminating circuit 35 inputs an error flag corresponding to a pixel for detecting the presence or absence of a motion,
It is possible to determine whether an error has occurred in the pixel and the corresponding pixel one frame before.

That is, as shown in FIG.
Is the frame PFR0 whose motion is to be detected
In the frame PFR1 one frame before the frame PFE0, it is determined whether or not an error has occurred for each pixel based on the error flag.

If an error has occurred in the pixel B in the frame PFR0, the determination circuit 35 determines whether or not an error has occurred in the pixels A and C adjacent to the left and right of the pixel B in the frame PFR0. At the same time, it is determined whether or not an error has occurred in the pixel X and the pixel Z corresponding to the pixel A and the pixel C in the frame PFR0 for the frame PFR1.

Here, pixel A, pixel C, pixel X, and pixel Z
If an error has occurred in any of the above, the determination circuit 35 determines that it is impossible to detect the presence or absence of a motion with respect to the pixel B, and sends the determination result to the interpolation circuit 22 as a determination output signal S21. .

On the other hand, when there is no error in all of the pixels A, C, X, and Z, the determination circuit 35 determines that the presence or absence of the movement with respect to the pixel B can be detected. In this case, the discriminating circuit 35 determines each of the pixels A and C from the difference between the pixels A and X and the difference between the pixels C and Z based on the comparison data S34 output from the comparing circuit 34 (FIG. 2). Detects movement.

Here, the discrimination circuit 35 determines whether the pixel A and the pixel C
Are not moving (i.e., still), the pixel B in which the error has occurred is also determined to have not moved. On the other hand, if at least one of the pixels A and C is moving, the pixel B also moves. It determines that there is, and sends the determination result to the interpolation circuit 22 as the determination output signal S21.

On the other hand, FIG.
1 (FIG. 1) Field presence / absence detector 4 based on the field difference
0, the reproduction digital video data S13 is input to the field memory 41 for each field, and the delayed data S41 delayed by one field is sent to the line memory 42 and the arithmetic circuit 43.

The line memory 42 is a field memory 41
Is input and output line by line, the data for each line for each field is delayed by one line and input to the arithmetic circuit 43 as one line delay data S42. Accordingly, the arithmetic circuit 43 receives the delay data S41 output from the field memory 41 and the one-line delay data S42 output from the line memory 42, and thereby, as shown in FIG. Pixel U, pixel V, pixel W... And pixel X, pixel Y, pixel Z of the first and second lines are input.

(Equation 1)

(Equation 2) , The pixel data of the pixel U and the pixel W of the first line of the odd field and the pixel X and the pixel Z of the second line are calculated as the calculated pixel data A ′ and C ′, and the calculated data This is sent to the subsequent absolute value calculation circuit 44 as S43. Here, the calculated pixel data A 'and C' are data corresponding to the pixels A and C in the even field following the odd field.

The absolute value calculation circuit 44 directly inputs the reproduced digital video data S13, and thereby, from the operation data S43 and the reproduced digital video data S13, the reproduced digital video data S13 and one field before the reproduced digital video data S13. The difference of the calculation pixel data obtained from the image data is calculated. That is, ev is generated by the reproduced digital video data S13.
en field image data (pixels A and C in FIG. 6)
Of the odd field and the calculated pixel data A ′ and C ′ calculated from the image data of the odd field (data of the pixel U, the pixel W, the pixel X, and the pixel Z) as the calculation data S43. The difference between the data of the pixels A and C in the even field and the calculated pixel data A 'and C' of the odd field corresponding to the data is calculated and sent to the comparison circuit 45 as field difference data S44.

The comparison circuit 45 outputs the field difference data S4
4 is compared with a preset threshold value, and the comparison result is sent to the discrimination circuit 46 as comparison data S45. Based on the comparison data S45, the discrimination circuit 46 determines that the pixel has motion when the field difference data S44 exceeds the threshold, and determines that the pixel does not move (i.e., stops) when the field difference data S44 does not exceed the threshold. to decide.

At the same time, the motion presence / absence detecting section 40 based on the field difference inputs the error flag input together with the reproduced digital video data S13 to the discriminating circuit 46, and sets the error flag (S13) for each field. By inputting the data into the field memory 47, the delay data S47 delayed by one field is obtained and sent to the line memory 48 and the discrimination circuit 46. The line memory 48 delays the input delay data S47 by one line and inputs it to the discrimination circuit 46 as one-line delay data S48.

Accordingly, the discriminating circuit 46 inputs an error flag corresponding to a pixel for detecting the presence or absence of a motion,
It is possible to determine whether or not an error has occurred in the pixel and the pixel adjacent one field up and down one field before.

That is, as shown in FIG.
Is the field PFL whose motion is to be detected
Based on the error flag, it is determined whether or not an error has occurred for each pixel in the field PFL1 which is 0 and the field PFL0 which is one field before the field PFL0.

Here, in the field PFL0, the pixel B
If an error has occurred in the field PFL0, the determination circuit 46 determines whether the pixel A
And whether or not an error has occurred for the pixel C, and for the field PFL1 one field before, the pixels U, X, W, and Z located above and below the pixels A and C of the field PFL0, respectively. Determine whether an error has occurred.

Here, pixel A, pixel C, pixel U, pixel X,
If an error has occurred in either the pixel W or the pixel Z, the determination circuit 46 determines that it is impossible to detect the presence / absence of a motion with respect to the pixel B, and uses the determination result as the determination output signal S21. The signal is sent to the circuit 22.

On the other hand, when there is no error in all of the pixels A, C, U, X, W and Z,
The determination circuit 46 determines that it is possible to detect the presence / absence of a motion with respect to the pixel B. In this case, the determination circuit 46 is the comparison circuit 4
5 (FIG. 4), the difference between the data of pixel A and the calculated pixel data A ′ and the difference between the data of pixel C and the calculated pixel data C ′, The presence or absence of each movement is detected.

Here, the discrimination circuit 46 determines whether the pixel A and the pixel C
Are not moving (i.e., still), the pixel B in which the error has occurred is also determined to have not moved. On the other hand, if at least one of the pixels A and C is moving, the pixel B also moves. It determines that there is, and sends the determination result to the interpolation circuit 22 as the determination output signal S21.

FIG. 7 shows an interpolation processing procedure in the error correction circuit section 25 comprising a motion presence / absence detection circuit 21 and an interpolation circuit 22. The interpolation processing procedure is entered from step SP1. It is determined whether the presence / absence detection is possible. If an affirmative result is obtained, the error correction circuit unit 25 proceeds to the next step SP3 to detect the presence or absence of a motion based on the frame difference. If it is determined that there is a motion at this time, the error correction circuit unit 25 proceeds to the next step SP4 and reads the data in the field. Is performed, and the processing procedure ends in step SP17.

Here, the interpolation processing using the data in the field is performed, for example, as shown in FIG.
When trying to interpolate lor, the following equation is used based on the data of the six surrounding pixels (pixel A, pixel C, pixel D, pixel F, pixel G and pixel I):

(Equation 3) The data of the error pixel error is calculated by the following equation, and the error pixel error is interpolated by the calculated data.

On the other hand, if it is determined in step SP3 that the image is stationary, the process proceeds to step SP5 to execute an interpolation process based on the previous frame data, and ends the processing procedure in step SP17.

Further, the error correction circuit section 25 performs step SP
If a negative result is obtained in step 2, the process proceeds to step SP6 to determine whether or not it is possible to detect the presence / absence of a motion based on the field difference. Here, if a positive result is obtained, the error correction circuit unit 25 proceeds to step SP7 to detect the presence or absence of a motion due to the field difference.

If it is determined that there is a motion, the error correction circuit unit 25 performs the interpolation process using the other pixel data in the field described above with reference to FIG. 8 in the following step SP8, and ends the processing procedure in step SP17. On the other hand, if it is determined in step SP7 that the object is stationary, the process proceeds to step SP9, where the interpolation processing based on the previous field data is executed, and the processing procedure ends in step SP17.

When a negative result is obtained in step SP6, the error correction circuit unit 25 proceeds to the next step SP10 and determines whether or not interpolation within the field is possible. If an affirmative result is obtained here, the error correction circuit unit 25 proceeds to step SP11 to execute the interpolation process using other pixel data in the field described above with reference to FIG. 8, and ends the processing procedure in step SP17.

On the other hand, if a negative result is obtained in step SP10, the error correction circuit unit 25 proceeds to the next step SP12 and determines whether or not interpolation by the data one field before is possible. If an affirmative result is obtained, the error correction circuit unit 25 proceeds to step SP13, executes an interpolation process using the data one field before, and ends the processing procedure in step SP17.

On the other hand, if a negative result is obtained in step SP12, the error correction circuit unit 25 proceeds to the next step SP14, and determines whether or not interpolation using data two fields before is possible. Here, if a positive result is obtained, the error correction circuit unit 25 proceeds to step SP15 to execute an interpolation process using the data two fields before, and ends the processing procedure in step SP17.

On the other hand, if a negative result is obtained in step SP14, the error correction circuit unit 25 proceeds to the following step SP16, and replaces the pixel in which the error has occurred with gray level data, and then proceeds to the next step SP17.
Ends the processing procedure.

In the above configuration, the DVTR 20 determines whether a pixel in which an error has occurred in the error correction circuit unit 25 is a pixel of a moving image or a pixel of a still image. Then, an interpolation process according to the determination result is executed.

In other words, whether or not the error pixel is a pixel of a moving image is determined based on the presence or absence of the motion of the peripheral pixel of the error pixel by performing the motion presence / absence detection processing based on the frame difference or the field difference. Or a pixel of a still image. If there is a motion based on this determination result, the error pixel is interpolated using other pixel data in the field, and if there is no motion, the corresponding pixel data of the previous frame or the previous field is used. By interpolating the error pixel, it is possible to perform an interpolation process suitable for each of the motions of the error pixel.

In the case where at least one of the pixels surrounding the error pixel is a pixel forming a moving image, the error pixel is regarded as a moving pixel and interpolation processing is performed in accordance with the pixel. In the case where the error pixel is a part of the moving image or a pixel adjacent to the moving image in pixel units, the error pixel can be replaced with data similar to the moving image, and an image with no more uncomfortable feeling can be obtained. it can.

According to the above arrangement, whether the error pixel is a pixel of a moving image or a pixel of a still image is determined based on the presence or absence of movement of pixels around the error pixel. By performing the interpolation processing according to the moving image or the still image based on the above, it is possible to perform the interpolation processing according to the state of the error pixel (the moving image or the still image).

In the above-described embodiment, a case has been described in which the presence / absence of a motion due to the frame difference is detected based on the presence / absence of the motion of pixels adjacent to the left and right of the error pixel using the configuration shown in FIG. However, the present invention is not limited to this, and the presence or absence of movement of the error pixel may be detected based on the presence or absence of movement of all pixels surrounding the error pixel.

That is, as shown in FIG. 9, the motion presence / absence detecting section 50 based on the frame difference detects the delayed digital video data S13 by delaying one frame by one frame via the field memories 51 and 52 for each field. This is input to the absolute value calculation circuit 53.

The absolute value calculating circuit 53 directly inputs the reproduced digital video data S13, and thus, from the delay data S52 and the reproduced digital video data S13, the reproduced digital video data S13 and the frame one frame before the reproduced digital video data S13. The difference of the image data (delay data S52) is calculated and sent to the comparison circuit 54 as frame difference data.

The comparison circuit 54 compares the frame difference data with a preset threshold value, and compares the comparison result with the comparison data S.
As 54, it is inputted to the discriminating circuit 57 and the line memory 55. The line memory 55 delays the comparison data S54 by one line, and stores the one-line delay data S55 in the determination circuit 57.
And to the line memory 56. The line memory 56 further delays the one-line delay data S55 by one line and sends it to the discrimination circuit 57 as two-line delay data S56.

The discrimination circuit 57 detects the presence or absence of motion for each of the three adjacent pixels on the basis of the comparison data S54, the one-line delay data S55, and the two-line delay data S56. Is delayed by an internal delay circuit (not shown) to detect the presence / absence of the movement of the pixel adjacent to the left and right for each line among the pixels of the three lines.

That is, based on the comparison data S54, if the frame difference data exceeds the threshold value, it is determined that the pixel has motion, and if it does not exceed the threshold value, it is determined that the pixel has no motion (ie, still). I do.

At the same time, the motion presence / absence detecting section 50 based on the frame difference outputs the reproduced digital video data S
The delay data S59 is obtained by delaying the error flag input together with the data 13 together with each other by one frame for each field via the field memories 58 and 59.
59 to a discrimination circuit 57 and a line memory 60
To obtain the one-line delay data S60, which is input to the discrimination circuit 57 and the line memory 61. The line memory 61 obtains two-line delay data S61 by further delaying the one-line delay data S60 by one line, and inputs this to the discrimination circuit 57.

The line memory 62 obtains one-line delay data S62 by delaying the error flag input together with the reproduced digital video data S13 by one line, and inputs the data to the discrimination circuit 57 and the line memory 63. The line memory 63 obtains two-line delay data S63 by further delaying the one-line delay data S62 by one line, and inputs this to the discrimination circuit 57.

Accordingly, the discriminating circuit 35 inputs an error flag corresponding to a pixel for detecting the presence or absence of a motion,
It is possible to determine whether an error has occurred in the pixel and the corresponding pixel one frame before.

That is, it is determined whether or not an error has occurred for each pixel in the frame for which the presence or absence of the motion is to be detected and the frame one frame before the frame based on the error flag. Here, FIG.
As shown in FIG. 0, when an error occurs in the pixel E in the frame for which the presence or absence of the motion is to be detected, the determination circuit 57 determines whether the pixel A, the pixel B, and the pixel A are adjacent to the pixel E and surround the pixel E in the frame. It is determined whether or not an error has occurred in the pixels C, D, F, G, H, and I, and an error has occurred in the corresponding pixel in the frame one frame before the current frame. It is determined whether or not.

Here, pixel A, pixel B, pixel C, pixel D,
If an error has occurred in any of the pixels F, G, H, and I and each of the pixels in the previous frame corresponding to these pixels, the determination circuit 57 detects whether or not the pixel E has moved. Is determined to be impossible, and the determination result is sent to the interpolation circuit 22 as a determination output signal S21.

On the other hand, when there are no errors in the pixels A, B, C, D, F, G, H, and I, and all the pixels in the previous frame corresponding to these pixels. , The determination circuit 57 determines that it is possible to detect the presence / absence of a motion with respect to the pixel E. In this case, the determination circuit 57 determines whether the pixel A, the pixel B, the pixel C, the pixel D, the pixel F, or the pixel G is based on the comparison data S54 output from the comparison circuit 54, the one-line delay data S55, and the two-line delay data S56. The presence or absence of movement of each of the pixels H and I is detected.

Here, the determination circuit 57 determines whether the pixel A, the pixel B,
When all of the pixels C, D, F, G, H, and I have no motion (that is, still), the pixel E in which the error has occurred is also determined to have no motion. , When at least one of the pixels B, C, D, F, G, H, and I is moving, it is determined that the pixel E is also moving, and the result of the determination is used as a determination output signal S21 as an interpolation circuit. 22.

As described above, by detecting the presence / absence of a motion based on all the pixels surrounding the error pixel, it is possible to avoid the omission of detection of the moving image portion and detect the presence / absence of the motion more accurately.

Further, in the above-described embodiment, the present invention
Although the description has been given of the case where the present invention is applied to a VTR, the present invention is not limited to this, and can be widely applied to various other moving picture encoding devices that encode moving picture data.

[0068]

As described above, according to the present invention, from the state in which a transmission path error has actually occurred, the presence or absence of the movement of the pixel in which the transmission path error has occurred is determined based on the information on the surrounding pixels. Or, if the presence or absence of the motion of the pixel can be detected by the inter-frame difference processing, the optimal interpolation according to the presence or absence of the motion is performed on the pixel, Even if the presence or absence of the movement of the pixel cannot be detected by the inter-frame difference processing, if the presence or absence of the movement of the pixel can be detected by the inter-field difference processing, the presence or absence of the movement of the pixel is determined. By performing the optimal interpolation, every time a transmission path error occurs, the presence or absence of the motion of the pixel is sequentially executed by the inter-frame difference processing or the inter-field difference processing, and the detection is performed. Since the results in optimum interpolation according to the presence or absence of the motion of the pixel based can be performed efficiently, it can realize an image decoding apparatus capable of restoring the image without visually uncomfortable feeling.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a moving picture coding apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of a motion presence / absence detection circuit unit based on a frame difference.

FIG. 3 is a schematic diagram illustrating a method of detecting the presence / absence of a motion based on a frame difference.

FIG. 4 is a block diagram showing a configuration of a motion presence / absence detection circuit unit based on a field difference.

FIG. 5 is a schematic diagram illustrating a method for detecting the presence or absence of a motion based on a field difference.

FIG. 6 is a schematic diagram illustrating a method for detecting the presence or absence of a motion based on a field difference.

FIG. 7 is a flowchart showing an interpolation processing procedure.

FIG. 8 is a schematic diagram for explaining an intra-field interpolation process;

FIG. 9 is a block diagram showing another embodiment of a circuit for detecting the presence / absence of a motion based on a frame difference.

FIG. 10 is a schematic diagram illustrating a method for detecting the presence or absence of a motion according to another embodiment.

FIG. 11 is a block diagram showing a conventional DVTR.

[Explanation of symbols]

1, 20,... DVTR, 21...
22 ... interpolation circuit, 25 ... error correction circuit section, 30,
50: a motion presence / absence detection unit based on a frame difference;
46, 57... Discrimination circuit, 40...

Claims (4)

(57) [Claims] 1. Image informationButCodingTransmitted encoded information
Decoding apparatus for receiving and decoding via a channelsmell
hand,When a transmission path error occurs for the pixel of the encoded information
Error detection means for detecting whether or not The picture in the current frame in which the transmission path error has occurred
The presence or absence of elementary motion is determined by the
Either before or after the surrounding pixel information and the current frame
Based on pixel information around the corresponding pixel in one frame
Frame difference motion presence / absence detecting means for detecting Pixels in the current field where the transmission path error occurred
Of the pixel in the current field
Regardless of surrounding pixel information and the current field
Based on the pixel information of the corresponding pixel in one of the fields
A field difference motion presence / absence detecting means for detecting, The above-mentioned frame difference motion presence / absence detection means
When motion is detected, the above transmission line error occurs
Around the field that contains the pixel when
Based on the pixel information of the pixel, information is transmitted by the transmission path error.
Interpolates the pixel for which the report is missing, and there is no movement of the pixel
Is detected based on the previous frame data.
Interpolate primes, The above-mentioned frame difference motion presence / absence detection means
Even if the movement cannot be detected,
The motion of the pixel is determined to be present by the differential motion presence / absence detection means.
When the transmission path error is detected,
The image of the surrounding pixels in the current field containing the pixel
Missing information due to the above transmission path error based on raw information
Interpolated the detected pixel and detected that there was no motion of the pixel.
Pixel, the pixel is complemented based on the previous field data.
Interpolating means Characterized by havingImage decoding
apparatus. 2. The apparatus according to claim 1, wherein said interpolating means includes said frame difference motion.
The non-detection means and the field difference motion presence / absence detection means
Both cannot detect the presence or absence of the movement of the pixel and
Was a Kiniwa, including of the pixel in which the transmission path error has occurred
Based on the data one field before the current field
2. The image decoding apparatus according to claim 1, wherein the pixel is interpolated by using the pixel . 3. The interpolation means according to claim 1, wherein
Data cannot be interpolated based on data
The image decoding apparatus according to claim 2, wherein the pixel is interpolated based on the data . 4. The interpolation means according to claim 1, wherein
If interpolation is not possible even based on the
Replace the generated pixel with gray level data
4. The image decoding apparatus according to claim 3, wherein the pixel is interpolated by: