JPH10243390A - Device for generating picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a band division processing by suppressing the increase of a circuit scale and arithmetic amounts and to obtain first and second pictures with satisfactory qualities by operating a first filter processing to a first picture for generating an intermediate picture and performing a second filter processing to the intermediate picture for generating plural band data. SOLUTION: An inputted first picture signal (1280×720 picture elements) is inputted to an intermediate picture generating part 101. The intermediate picture generating part 101 performs a first filter processing to an inputted first picture, and generates an intermediate picture (1440×960 picture elements). The intermediate picture is inputted to a band dividing part 102. The band dividing part 102 performs a second filter processing to the inputted intermediate picture, and generates four band data (each band data are 720×480 picture elements). Thus, the intermediate picture (1440×960 picture elements) is generated from the first picture elements (1280×720 picture elements), and the band division is operated to the intermediate picture so that the minimum band data (720×480 picture elements) are generated with a smaller circuit scale and arithmetic amounts than the case tat the band division is operated to the first picture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for generating a second video signal having a different frequency band and size from a first video signal (original signal), encoding the second video signal, The present invention relates to a video signal generation device, a recording device, a transmission device, and a playback device used when recording or transmitting the encoded data.

[0002]

2. Description of the Related Art There is a frequency band division method as one of image signal compression methods. In this method, an original image is filtered, divided into a plurality of frequency band data, and encoding is performed for each band data. By allocating a large code amount to the low-frequency data and a small code amount to the high-frequency data, efficient compression becomes possible.

[0003] In the frequency band division method, another image having an occupied frequency band and a size different from the first image (this is called a second image) is generated from an arbitrary image (this is called a first image). This is also an effective method when doing so. Now M ×
A first image composed of N (M and N are integers) pixels is subjected to filter processing for limiting the frequency band to １ ／ in both the horizontal and vertical directions, and divided into four frequency band data. At this time, by detecting the lowest band data, (M /
2) A second image consisting of × (N / 2) pixels is obtained.

FIG. 14 shows a block diagram of a conventional example. 70
0 is a first image input unit, and 701 is a band division unit. M ×
The first image including N pixels is input to the first image input unit 700. The first image is input to the band division unit 701. The band dividing unit performs a filtering process on the first image, and divides the first image into R band data so that the lowest band data is K × L pixels.

[0005] The image used in the description and the number of bands to be divided are defined below. -First image: sampling frequency = 74.25 MHz.

Size = 1280 × 720 (M = 128)
0, N = 720) pixels. -Lowest band data: sampling frequency = 27MHz.

Size = 720 × 480 (K = 720, L
= 480) pixels. -Total number of band data: 4 (R = 4) Thereafter, this setting (M = 1280, N = 720, K =
720, L = 480, R = 4).

FIG. 15 shows four band data when band division is performed with the above setting. The filtering process at this time is shown in FIGS. Actually, the first image is horizontally and vertically filtered in order to obtain four band data. However, for simplicity, the case where the filtering is performed in the horizontal direction will be described.

In FIG. 16, since the sampling frequency of the first image is 74.25 MHz, the Nyquist frequency is 74.25 /
2 = 37.125MHz. That is, the occupied frequency band of the first image is 0 to 37.125 MHz. Since the sampling frequency of the second image is 27 MHz, the occupied frequency band is 0 to 1
3.5 MHz.

The number of horizontal pixels of the first image is 1280, the number of horizontal pixels of the lowest band data is 720, and the ratio is 16:
Therefore, when obtaining low-frequency data from the first image,
After re-sampling at 9 times the sampling frequency of 4.25 MHz and extracting the low band with a low-pass filter,
It is sufficient to perform thinning in. FIG. 17A shows the frequency characteristics of the low-pass filter. On the other hand, the number of horizontal pixels in the high band is 128.
0−720 = 560, and the ratio to the first image is 16:
Therefore, when obtaining high-frequency data from the first image,
After re-sampling at 7 times the sampling frequency of 4.25 MHz and extracting the high band with a high-pass filter,
It is sufficient to perform thinning in. FIG. 17B shows the frequency characteristics of the high-pass filter. The filter characteristics shown in FIGS. 17A and 17B are filter characteristics that do not cause aliasing distortion. Band data generated by a filter inferior to the characteristics shown in the figure includes aliasing distortion.

From FIG. 17A, the frequency characteristic of the low-pass filter is 0 MHz to 20.89 MHz: gain 1 20.89 MHz to 334.125 MHz: gain 0 On the other hand, from FIG. 17B, the frequency characteristic of the high-pass filter is 0 MHz to 20.89 MHz: gain 0 20.89 MHz to 37.125 MHz: gain 1 37.125 MHz to 259.875 MHz: gain 0 Note that 27 MHz is a boundary point because the same filter processing is performed in the vertical direction. Occupied frequency band of lowest band data is 0 by performing horizontal and vertical filter processing
~ 13.5MHz.

[0012]

However, in the conventional example, a filter for performing band division on the first image is:
Very strict conditions had to be met, and both the circuit scale and the amount of computation were very large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to perform band division processing while suppressing an increase in the circuit scale and the amount of calculation, thereby providing a high quality second image and a first image. Is provided.

[0014]

According to a first aspect of the present invention, the first image composed of M × N pixels (M and N are integers) has the lowest band data of K × N. L (K,
L is an integer) in a system that performs band division processing so as to consist of pixels, performs a first filter processing on the first image,
An intermediate image generating means for generating an intermediate image composed of (S × 2 × K) × (T × 2 × L) (S and T are integers); and performing a second filtering process on the intermediate image to obtain R ( (R is an integer) band dividing means for generating band data.

A second invention is a system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of M × N (M and N are integers) pixels. , A first filter process is performed on the first image, and (S × 2 × K)
An intermediate image generating means for generating an intermediate image composed of × (T × 2 × L) (S and T are integers), and performing a second filtering process on the intermediate image to obtain R (R is an integer) band data And a band dividing unit for generating the R band data.
Data dividing means for dividing the lowest band data into a second image and the other band data into auxiliary data, and first high-efficiency coding for high-efficiency coding the second image and generating first coded data Means, second efficient encoding means for encoding the auxiliary data with high efficiency to generate second encoded data, and first recording transmission for recording and transmitting the first encoded data on any first medium An image recording / transmission apparatus comprising: an apparatus; and a second recording / transmission apparatus for recording and transmitting the second encoded data to an arbitrary second medium.

A third invention is a system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of M × N (M and N are integers) pixels. , A first filter process is performed on the first image, and (S × 2 × K)
X (T × 2 × L) (S and T are integers), a first intermediate image generating means for generating a first intermediate image, and a second filtering process on the first intermediate image to obtain R ( (R is an integer) band dividing means for dividing the data into band data, a second image detecting means for detecting the lowest band data among the R pieces of second image data and forming the second image, and the second image And a second intermediate image generating means for generating a second intermediate image composed of M × N pixels, and performing a difference operation between the first image and the second intermediate image to obtain difference data The difference data generating means for generating, the first high-efficiency encoding means for high-efficiency encoding the second image to generate first encoded data, and the difference data as the second data, the second data First high-efficiency encoding means for high-efficiency encoding and generating second encoded data; The first encoded data is recorded on an arbitrary first medium, a first recording and transmitting apparatus for transmitting, and the second encoded data is recorded on an arbitrary second medium, a second recording and transmitting apparatus for transmitting. An image recording and transmitting apparatus provided with the apparatus.

According to a fourth aspect, an image is characterized in that the frequency characteristic of the second filter changes according to the recording capacity of the first recording medium or the transmission capacity of the first transmission medium. It is a recording transmission device.

According to a fifth aspect, a second image composed of K × L (K and L are integers) pixels is generated from a first image composed of M × N (M and N are integers) pixels and processed. In the system, a first filtering process is performed on the first image, and (S × 2 ×
K) × (T × 2 × L) (S and T are integers), an intermediate image generating means for generating an intermediate image, and a second filter for performing a second filtering process on the intermediate image to generate the second image. An image generating apparatus comprising two image generating means.

According to a sixth aspect of the present invention, processing is performed by converting a first image composed of M × N (M and N are integers) pixels into a second image composed of K × L (K and L are integers) pixels. In the system, a first filtering process is performed on the first image, and (S × 2 × K)
An intermediate image generating means for generating an intermediate image composed of × (T × 2 × L) (S and T are integers), and a second filter for performing a second filtering process on the intermediate image to generate the second image Image generating means, high-efficiency coding means for performing high-efficiency coding on the second image to generate coded data, and recording and transmitting means for recording and transmitting the coded data to any medium Image recording and transmitting apparatus.

A seventh invention is characterized in that the frequency characteristic of the second filter changes according to the recording capacity of the first recording medium or the transmission capacity of the first transmission medium. It is a recording transmission device.

According to an eighth aspect of the present invention, there is provided an image recording and transmitting apparatus wherein the first high-efficiency encoding means is different from the second high-efficiency encoding means.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a first configuration of the present invention, M × N
In a system that performs band division processing so that the lowest band data is composed of K × L (K and L are integers) pixels for a first image composed of (M and N are integers) pixels, The first filter processing is performed, and (S × 2 × K) × (T × 2 ×
L) (S and T are integers) to generate an intermediate image, perform a second filtering process on the intermediate image, and generate R (R is an integer) band data.

Thus, band data can be generated with a small circuit scale. In the second configuration, M × N
(M and N are integers) From the first image consisting of pixels, K × L
In a system for generating and processing a second image composed of (K and L are integers) pixels, a first filter process is performed on the first image to obtain (S × 2 × K) × (T × 2 × L) ( S and T are integers)
And performs a second filtering process on the intermediate image to generate R band data, and among the R band data, the lowest band data is the second image, and the other bands are The data is auxiliary data, the second image is encoded with high efficiency to generate first encoded data, recorded and transmitted to the first recording transmission medium, the auxiliary data is encoded with high efficiency to generate second encoded data, Recording and recording on two recording media.

As a result, the second image and the higher definition first image can be provided with a small circuit scale and a small amount of calculation.

In the third configuration, M × N (M and N are integers)
In a system that generates and processes a second image composed of K × L (K and L are integers) pixels from a first image composed of pixels, a first filter process is performed on the first image, and (S × 2 × K) ×
A first intermediate image composed of (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the first intermediate image to generate R band data, and R number of band data are generated. Of the band data, the lowest band data is used as the second image, a third filtering process is performed on the second image, a second intermediate image including M × N pixels is generated, and the first image and the second image are processed. Generating difference data from the second intermediate image, encoding the second image with high efficiency, generating first encoded data, first recording the first encoded data, recording and transmitting the data on a transmission medium, and increasing the differential data. Efficiency encoding is performed to generate second encoded data, and the second encoded data is recorded and transmitted to an arbitrary second medium.

Thus, the second image and the higher definition first image can be provided with a small circuit scale and a small amount of calculation.

In the fourth configuration, when the intermediate image is subjected to the second filter processing to generate the band data, the frequency characteristic of the second filter is changed according to the recording capacity of the first recording medium or the first transmission. It changes according to the transmission capacity of the medium.

As a result, it is possible to provide a high-quality second image and a higher-definition first image with a small circuit scale and a small amount of calculation.

In the fifth configuration, M × N (M and N are integers)
In a system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of pixels,
First filter processing is performed on the first image, and (S × 2 × K)
An intermediate image composed of × (T × 2 × L) (S and T are integers) is generated, and a second filter process is performed on the intermediate image to generate a second image.

Thus, the second image and the image of the same size as the first image can be provided with a small circuit scale and a small amount of calculation.

In the sixth configuration, M × N (M and N are integers)
In a system in which a first image composed of pixels is converted into a second image composed of K × L (K and L are integers) pixels and processed, a first filter process is performed on the first image, and (S × 2 × K) ×
An intermediate image composed of (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the intermediate image to generate a second image, and high-efficiency encoding is performed on the second image. Then, encoded data is generated, and the encoded data is recorded and transmitted to an arbitrary recording transmission medium.

As a result, the second image and the image of the same size as the first image can be provided with a small circuit scale and a small amount of calculation.

In the seventh configuration, when the second image is generated by performing the second filter processing on the intermediate image, the frequency characteristic of the second filter is changed to the recording capacity of the recording medium or the transmission capacity of the transmission medium. Will change accordingly.

Thus, it is possible to provide a high-quality second image and an image of the same size as the first image with a small circuit scale and a small amount of calculation.

In the eighth configuration, the first high-efficiency encoding means is different from the second high-efficiency encoding means. When the first high-efficiency encoding means is a general-purpose method such as MPEG and the second high-efficiency encoding means is a unique method, a dedicated decoder is used to obtain a higher-definition first image. Is required, and when the first image is obtained, it is possible to perform a service of separately charging.

(First Embodiment of the Invention) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 100 denotes a first image input unit;
101 is an intermediate image generation unit, and 102 is a band division unit.

Next, the operation of this embodiment will be described. Input first image signal (1280 × 720 pixels)
Is input to the intermediate image generation unit 101. The intermediate image generation unit 101 performs a first filtering process on the input first image, and generates an intermediate image (1440 × 960 pixels). The intermediate image is input to the band dividing unit 102. Band division unit 1
02 performs the second filtering process on the input intermediate image and performs four band data (each band data is 720 × 480).
Pixel). FIG. 2 shows the first image, the intermediate image, and the band data.

Here, the difference between this embodiment and the conventional system will be described again. As described above, the frequency characteristics of the low-pass filter used in the conventional method are as follows: 0 MHz to 27 MHz: gain 1 27 MHz to 334.125 MHz: gain 0 The frequency characteristics of the high-pass filter are 0 MHz to 27 MHz: gain 0 27 MHz to 37.125 MHz: gain 1 37.125 MHz to 259.875 MHz: gain 0, and filters that satisfy the above conditions are designed from the viewpoint of circuit size and computational complexity Very difficult to think about.

On the other hand, in the present embodiment, as described in FIG. 1, the first image is subjected to the first filter processing to generate an intermediate image, and the intermediate image is subjected to the second filter processing to obtain four intermediate images. Generate band data. Looking at the frequency characteristics to be satisfied by each filter as in the conventional example, as for the first filter, the number of horizontal pixels of the first image is 1280, and the number of horizontal pixels of the intermediate image is 1440, as shown in FIG. The ratio is 8: 9. That is, when obtaining an intermediate image from the first image, as shown in FIG.
After re-sampling at twice the sampling frequency and performing the first filter processing, the sampling may be thinned out by 1/8. The frequency characteristics of the first filter are as follows: 0 MHz to 37.125 MHz: gain 1 37.125 MHz to 334.125 MHz: gain 0 Next, as for the second filter, as shown in FIG. 5, the number of horizontal pixels of the intermediate image is 1440, the number of horizontal pixels of the lowest band data is 720, and the ratio is 2: 1.
That is, when obtaining a low-frequency component from the intermediate image, low-pass filtering is performed as shown in FIG. The frequency characteristics of the low-pass filter in the second filter are as follows: 0 MHz to 27 MHz: gain 1 27 MHz to 54 MHz: gain 0 On the other hand, the number of horizontal pixels in the high frequency region is 1440-720 = 720, and the ratio to the intermediate image is 2: 1. Therefore, in order to obtain a high-frequency component from the intermediate image, high-pass filtering is performed as shown in FIG. The frequency characteristics of the high-pass filter in the second filter are as follows: 0 MHz to 27 MHz: gain 0 27 MHz to 54 MHz: gain 1 Looking at the characteristics of the low-pass filter and the high-pass filter of the second filter, (the characteristics of the high-pass filter) = 1− (the characteristics of the low-pass filter).
When this relationship holds, a high-pass filter can be easily designed from a low-pass filter. Therefore, hereinafter, only the description of the low-pass filter will be described in the description of the second filter. Since the high-pass filter satisfies the above relational expression, it can be determined more uniquely than the low-pass filter.

When comparing the conditions of the filter of the present embodiment with those of the conventional example, it is apparent that the filter of the present embodiment can be realized with a smaller circuit scale and a smaller amount of calculation.

As described above, an intermediate image (1440 × 960 pixels) is generated from the first image (1280 × 720 pixels).
By performing the band division on the intermediate image, it is possible to generate the lowest band data (720 × 480 pixels) with a smaller circuit scale and a smaller amount of calculation than when performing the band division on the first image.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

In FIG. 7, reference numeral 200 denotes a first image input unit;
201 is an intermediate image generation unit, 202 is a band division unit, 203
Is a data division unit, 204 is a first high-efficiency encoding unit, 20
Reference numeral 5 denotes a first recording / transmission unit, 206 denotes a second high-efficiency encoding unit, and 207 denotes a second recording / transmission unit.

Next, the operation of this embodiment will be described. The input first image signal is input to the intermediate image generation unit 201. The intermediate image generation unit 201 performs a first filtering process on the input first image, and generates an intermediate image.
The intermediate image is input to the band division unit 202. The band dividing unit 202 performs a second filtering process on the input intermediate image to generate four band data. The four band data are input to the data division unit 203. Data division unit 203
Divides the lowest band data of the input four band data into a second image and the other three band data into auxiliary data, as shown in FIG. The second image is input to the first high-efficiency encoder 204, and the auxiliary data is input to the second high-efficiency encoder 206. First high efficiency coding section 204
Generates highly encoded data of the input second image to generate first encoded data. The second high-efficiency encoding section 206 performs high-efficiency encoding of the input auxiliary data to generate second encoded data. The first encoded data is sent to the first recording / transmission unit 205, and the second encoded data is sent to the second recording / transmission unit 20.
7 is input. The first recording / transmission unit 205 records and transmits the input first encoded data to an arbitrary first recording / transmission medium. The second recording and transmitting unit 207 records and transmits the input second encoded data to an arbitrary second recording medium.

The receiving side can obtain the second image by decoding the first encoded data. In addition, a second image and auxiliary data can be obtained by decoding the first encoded data and the second encoded data, and a higher-definition second image can be obtained by performing a filtering process on the second image and the auxiliary data. One image can be obtained.

As described above, in the present embodiment, the second image and the first image can be obtained with a smaller circuit scale and a smaller amount of calculation.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

In FIG. 9, reference numeral 300 denotes a first image input unit;
301 is a first intermediate image generation unit, 302 is a band division unit,
303 is a second image detection unit, 304 is a second intermediate image generation unit, 305 is a first high-efficiency encoding unit, 306 is a first recording and transmission unit, 307 is a difference data generation unit, and 308 is a second data generation unit. The high-efficiency encoding unit 309 is a second recording and transmitting unit.

Next, the operation of this embodiment will be described. Input first image signal (1280 × 720 pixels)
Is input to the first intermediate image generation unit 301 and the difference data generation unit 307. The first intermediate image generating unit 301 performs a first filtering process on the input first image, and generates a first intermediate image (1440 × 960 pixels). The first intermediate image is input to the band division unit 302. The band dividing unit 302 performs a second filtering process on the input first intermediate image, and performs four band data (each band data is 720 ×
480 pixels). The four band data are input to the second image detection unit 303. The second image detection unit 303
The lowest band data is detected from the input four band data, and this is set as the second image. The second image is input to the first high-efficiency encoding unit 305 and the second intermediate image generation unit 304. The first high-efficiency coding unit 305 performs high-efficiency coding on the input second image to generate first coded data.

The first encoded data is transmitted to the first recording / transmission unit 3
06. The first recording / transmission unit 306 records and transmits the input first encoded data to an arbitrary first recording / transmission medium. The second intermediate image generation unit 304 performs a third filtering process on the input second image to generate a second intermediate image (1280 × 720 pixels). The second intermediate image is input to the difference data generator 307. The difference data generation unit 307 performs a difference operation between the input first image and the second intermediate image to generate difference data (1280 × 720 pixels). The difference data is sent to the second high efficiency encoding unit 3
08 is input. The second high-efficiency encoding unit 308 performs high-efficiency encoding of the input difference data to generate second high-efficiency encoded data. The second high-efficiency encoded data is input to the second recording and transmitting unit 309. Second recording transmission unit 3
09 records and transmits the input second encoded data to an arbitrary second recording and transmission medium.

The receiving side can obtain the second image by decoding the first encoded data. Further, by decoding the first coded data and the second coded data, it is possible to obtain the second image and the difference data, and the second intermediate image (1280) obtained by performing the filtering process on the second image. By adding the difference data to (* 720 pixels), a higher definition first image can be obtained.

As described above, in the present embodiment, the second image and the first image can be obtained with a smaller circuit scale and a smaller amount of calculation.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.

Although the structure and operation are the same as those of the second embodiment, in the present embodiment, the frequency characteristic of the second filter depends on the recording capacity of the first recording medium or the transmission capacity of the first transmission medium. It is characterized by changing.

FIG. 10A shows the occupied frequency region of the first image. The sampling frequency of the first image is 74.25MHz
Therefore, the Nyquist frequency is 37.125 MHz, and the occupied frequency range is 0 to 37.125 MHz. (b) shows the occupied frequency region of the intermediate image. Sampling frequency is 10
8 MHz, the Nyquist frequency is 54 MHz, and the occupied frequency range is 0 to 37.125 MHz. (c) shows the frequency characteristic of the second filter used when dividing the intermediate image into bands. Normally, a filter having a gain of 1 from 0 to 27 MHz and a gain of 0 from 27 MHz to 54 MHz is used. By using the filter shown in (c) horizontally and vertically,
The occupied frequency region of the second image is 0 to 13.5 MHz, and the second image having a sampling frequency of 27 MHz has a theoretically maximum bandwidth.

However, when the recording capacity of the first recording medium for recording the second image after encoding it with high efficiency, or the transmission capacity of the transmission medium for transmission is small, the actual compression ratio becomes large due to the wide bandwidth. In this case, the reproduced image may be folded or ringed, which causes a very large visual deterioration. Therefore, when the recording capacity of the first recording medium or the transmission capacity of the first transmission medium is small as shown in (d), the pass frequency band of the second filter is narrowed to occupy the second image. Make the frequency domain smaller than usual. Thereby, even when the recording capacity of the first recording medium or the transmission capacity of the transmission medium to be transmitted is small, a high-quality second image and first image can be obtained.

(Fifth Embodiment of the Invention) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS.

In FIG. 11, reference numeral 500 denotes a first image input unit, 501 denotes an intermediate image generation unit, and 502 denotes a second image generation unit.

Next, the operation of this embodiment will be described. Input first image signal (1280 × 720 pixels)
Is input to the intermediate image generation unit 501. The intermediate image generation unit 501 performs a first filtering process on the input first image to generate an intermediate image (1440 × 960 pixels). The intermediate image is input to band division section 502. The second image generation unit 502 performs a second filtering process on the input intermediate image, and generates a second image (720 × 480 pixels). FIG. 2 shows the sizes of the first image, the intermediate image, and the second image.

Conventionally, the first image (1280 × 960 pixels)
To the second image (720 × 480).
Pixel). However, as described in the description of the first embodiment, in the conventional method, the filter for generating the second image has to satisfy very strict conditions, and the design is very difficult. On the other hand, in the present embodiment, an intermediate image is generated from the first image and a second image is generated from the intermediate image, so that the second image can be obtained with a smaller circuit scale and a smaller amount of calculation.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.

In FIG. 13, reference numeral 600 denotes a first image input unit, 601 denotes an intermediate image generation unit, 602 denotes a second image generation unit, 603 denotes a high efficiency coding unit, and 604 denotes a recording transmission unit.

Next, the operation of this embodiment will be described. The input first image signal is input to the intermediate image generation unit 601. The intermediate image generation unit 601 performs a first filtering process on the input first image, and generates an intermediate image.
The intermediate image is input to the second image generation unit 602. The second image generation unit 602 performs a second filtering process on the input intermediate image, and generates a second image. The second image is input to the high efficiency encoding unit 603. The high efficiency coding unit 603 performs high efficiency coding on the input second image to generate coded data. The encoded data is input to the recording transmission unit 604. The recording transmission unit 604 records and transmits the input encoded data to an arbitrary recording transmission medium.

The receiving side can obtain the second image by decoding the encoded data. Further, by performing the filtering process on the second image, an image having the same size as the first image can be obtained.

As described above, in the present embodiment, the second image can be obtained with a smaller circuit scale and a smaller amount of calculation.

(Seventh Embodiment of the Invention) Hereinafter, a seventh embodiment of the present invention will be described with reference to FIGS.

Although the structure and operation are the same as those in the sixth embodiment, in the present embodiment, the frequency characteristic of the second filter depends on the recording capacity of the first recording medium or the transmission capacity of the first transmission medium. It is characterized by changing.

FIG. 10A shows an occupied frequency region of the first image,
(b) shows the occupied frequency region of the intermediate image, and (c) shows the frequency characteristics of the second filter used when generating the second image from the intermediate image. Usually, as shown in (c), a gain from 0 to 27 MHz is 1, and a filter from 27 MHz to 54 MHz having a gain of 0 is used horizontally and vertically, so that the occupied frequency region of the second image is 0. 3.513.5 MHz, and the second image having a sampling frequency of 27 MHz has a theoretically maximum bandwidth.

However, when the recording capacity of the first recording medium for recording the second image after encoding it with high efficiency or the transmission capacity of the transmission medium for transmission is small, the actual compression ratio is increased by having a wide bandwidth. In this case, the reproduced image may be folded or ringed, which causes a very large visual deterioration. Therefore, when the recording capacity of the first recording medium or the transmission capacity of the first transmission medium is small as shown in (d), the pass frequency band of the second filter is narrowed to occupy the second image. Make the frequency domain smaller than usual. Thus, even when the recording capacity of the first recording medium or the transmission capacity of the transmission medium to be transmitted is small, a high-quality second image can be obtained.

(Eighth Embodiment of the Invention) Hereinafter, an eighth embodiment of the present invention will be described with reference to FIG.

Although the structure and operation are the same as those of the second embodiment, the present embodiment differs from the second embodiment in that the coding method of the first high-efficiency coding unit and the coding method of the second high-efficiency coding unit are different. Are different.

The first high-efficiency encoding for encoding the second image is performed by a general-purpose method such as MPEG. On the other hand, the second high-efficiency encoding for encoding auxiliary data necessary for obtaining a higher-definition first image is performed by a method different from the first high-efficiency encoding method. Accordingly, a dedicated decoder is required to obtain a high-definition first image, and it is possible to perform a service of separately charging when obtaining the first image.

[0074]

As is apparent from the above description, in the first configuration of the present invention, the lowest band data is K for the first image composed of M × N (M and N are integers) pixels. × L
(K, L are integers) In a system that performs a band division process so as to be composed of pixels, a first filter process is performed on the first image,
An intermediate image composed of (S × 2 × K) × (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the intermediate image, and R (R is an integer) bands Generate data. As a result, band data can be generated with a small circuit scale.

In the second configuration, M × N (M and N are integers)
In a system that generates and processes a second image composed of K × L (K and L are integers) pixels from a first image composed of pixels, a first filter process is performed on the first image, and (S × 2 × K) ×
An intermediate image composed of (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the intermediate image to generate R band data, and among the R band data, The low band data is the second image, the other band data is the auxiliary data, the second image is encoded with high efficiency to generate the first encoded data, recorded on the first recording transmission medium, transmitted, and the auxiliary data Is encoded with high efficiency to generate second encoded data, which is recorded on a second recording medium and transmitted.

As a result, the second image and the higher definition first image can be provided with a small circuit scale and a small amount of calculation.

In the third configuration, M × N (M and N are integers)
In a system that generates and processes a second image composed of K × L (K and L are integers) pixels from a first image composed of pixels, a first filter process is performed on the first image, and (S × 2 × K) ×
A first intermediate image composed of (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the first intermediate image to generate R band data, and R number of band data are generated. Of the band data, the lowest band data is used as the second image, a third filtering process is performed on the second image, a second intermediate image including M × N pixels is generated, and the first image and the second image are processed. Generating difference data from the second intermediate image, encoding the second image with high efficiency, generating first encoded data, first recording the first encoded data, recording and transmitting the data on a transmission medium, and increasing the differential data. Efficiency encoding is performed to generate second encoded data, and the second encoded data is recorded and transmitted to an arbitrary second medium.

As a result, the second image and the higher definition first image can be provided with a small circuit scale and a small amount of calculation.

In the fourth configuration, when the intermediate image is subjected to the second filter processing to generate the band data, the frequency characteristic of the second filter is changed according to the recording capacity of the first recording medium or the first transmission medium. It changes according to the transmission capacity of the medium.

As a result, it is possible to provide a high-quality second image and a higher-definition first image with a small circuit scale and a small amount of calculation.

In the fifth configuration, M × N (M and N are integers)
In a system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of pixels,
First filter processing is performed on the first image, and (S × 2 × K)
An intermediate image composed of × (T × 2 × L) (S and T are integers) is generated, and a second filter process is performed on the intermediate image to generate a second image.

As a result, an image having the same size as the second image and the first image can be provided with a small circuit scale and a small amount of calculation.

In the sixth configuration, M × N (M and N are integers)
In a system in which a first image composed of pixels is converted into a second image composed of K × L (K and L are integers) pixels and processed, a first filter process is performed on the first image, and (S × 2 × K) ×
An intermediate image composed of (T × 2 × L) (S and T are integers) is generated, a second filter process is performed on the intermediate image to generate a second image, and high-efficiency encoding is performed on the second image. Then, encoded data is generated, and the encoded data is recorded and transmitted to an arbitrary recording transmission medium.

As a result, it is possible to provide an image having the same size as the second image and the first image with a small circuit scale and a small amount of calculation.

In the seventh configuration, when the second filter processing is performed on the intermediate image to generate the second image, the frequency characteristic of the second filter is changed to the recording capacity of the recording medium or the transmission capacity of the transmission medium. Will change accordingly.

As a result, a high-quality second image and an image of the same size as the first image can be provided with a small circuit scale and a small amount of calculation.

In the eighth configuration, the first high-efficiency encoding means is different from the second high-efficiency encoding means. When the first high-efficiency encoding means is a general-purpose method such as MPEG and the second high-efficiency encoding means is a unique method, a dedicated decoder is used to obtain a higher-definition first image. Is required, and when the first image is obtained, it is possible to perform a service of separately charging.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 shows a first image according to the first embodiment of the present invention;
Diagram showing intermediate image and four band data

FIG. 3 is a diagram showing a first image and an intermediate image according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a frequency characteristic of a first filter according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an intermediate image and four band data according to the first embodiment of the present invention;

FIG. 6 is a diagram illustrating frequency characteristics of a low-pass filter and a high-pass filter of a second filter according to the first embodiment of the present invention.

FIG. 7 is a block diagram of a second embodiment of the present invention.

FIG. 8 is a diagram illustrating an operation of a data division unit according to the second embodiment of the present invention.

FIG. 9 is a block diagram of a third embodiment of the present invention.

FIG. 10 is a diagram showing an operation in which the characteristic of a second filter changes according to the capacity of a first recording transmission medium in a fourth embodiment of the present invention.

FIG. 11 is a block diagram of a fifth embodiment of the present invention.

FIG. 12 is a diagram showing a first image, an intermediate image, and a second image according to a fifth embodiment of the present invention.

FIG. 13 is a block diagram of a sixth embodiment of the present invention.

FIG. 14 is a block diagram of a conventional example.

FIG. 15 is a diagram showing a first image and four band data in a conventional example.

FIG. 16 is a diagram showing an occupied frequency region of a first image.

FIG. 17 is a diagram showing frequency characteristics of a low-pass filter and a high-pass filter in a conventional example.

[Explanation of symbols]

100, 200, 300, 500, 600, 700 First image input unit 101, 201, 501, 601 Intermediate image generation unit 301 First intermediate image generation unit 102, 202, 302, 701 Band division unit 203 Data division unit 303 Second image detection units 502, 602 Second image generation unit 304 Second intermediate image generation unit 307 Difference data generation units 204, 305 First high efficiency coding units 206, 308 Second high efficiency coding units 205, 308 306 first recording transmission section 207, 309 second recording transmission section 400 second data 401 auxiliary data

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toyohiko Matsuda 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Seiichi Takeuchi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (16)

[Claims] 1. A band division process is performed on a first image composed of M × N (M and N are integers) pixels so that the lowest band data is composed of K × L (K and L are integers) pixels. In the system that performs the first filter processing on the first image, (S ×
An intermediate image generating means for generating an intermediate image composed of 2 × K) × (T × 2 × L) (S and T are integers); and performing a second filtering process on the intermediate image to obtain R (R is an integer) And a band dividing means for generating band data of (1). 2. A system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of M × N (M and N are integers) pixels. The first filter processing is performed on one image, and (S × 2 × K) × (T × 2 ×
L) an intermediate image generating means for generating an intermediate image composed of (S and T are integers), and a band dividing means for performing a second filtering process on the intermediate image to generate R (R is an integer) band data A data dividing means for dividing the lowest band data of the R band data into a second image, and dividing the other band data into auxiliary data; First high-efficiency encoding means for generating data, second high-efficiency encoding means for high-efficiency encoding of auxiliary data to generate second encoded data, and any first encoding data for the first encoded data. Recording on a medium, the first recording and transmission device to transmit, the second encoded data recorded on any second medium,
An image recording / transmission apparatus comprising: a second recording / transmission apparatus for transmitting. 3. A system for generating and processing a second image composed of K × L (K and L are integers) pixels from a first image composed of M × N (M and N are integers) pixels. The first filter processing is performed on one image, and (S × 2 × K) × (T × 2 ×
L) a first intermediate image generating means for generating a first intermediate image composed of (S and T are integers), and a second filtering process on the first intermediate image to obtain R (R is an integer) bands Band dividing means for dividing into data, second image detecting means for detecting the lowest frequency data among the R pieces of second image data to make a second image, and a third filter for the second image A second intermediate image generating means for performing processing and generating a second intermediate image composed of M × N pixels, and a differential data generation for generating a differential data by performing a difference operation between the first image and the second intermediate image Means, a first high-efficiency encoding means for high-efficiency encoding the second image to generate first encoded data, and the difference data as the second data, the second data is highly efficient encoding the second data First high-efficiency encoding means for generating encoded data; Encoding data is recorded on an arbitrary first medium, a first recording and transmitting apparatus for transmitting the image, and the second encoded data is recorded on an arbitrary second medium, and an image having a second recording and transmitting apparatus for transmitting the image Record transmission device. 4. A frequency characteristic of the second filter changes according to a recording capacity of the first recording medium or a transmission capacity of the first transmission medium.
Or the image recording and transmitting apparatus according to 3. 5. A system for performing processing by generating a second image composed of K × L (K and L are integers) pixels from a first image composed of M × N (M and N are integers) pixels, First filter processing is performed on the first image, and (S × 2 × K) × (T × 2 ×
L) an intermediate image generating means for generating an intermediate image composed of (S and T are integers); and a second image generating means for performing a second filtering process on the intermediate image to generate the second image. Image generation device. 6. A system for performing processing by converting a first image composed of M × N (M and N are integers) pixels into a second image composed of K × L (K and L are integers) pixels. First filter processing is performed on the first image, and (S × 2 × K) × (T × 2 ×
L) an intermediate image generating means for generating an intermediate image composed of (S and T are integers); a second image generating means for performing a second filtering process on the intermediate image to generate the second image;
An image recording and transmitting apparatus comprising: a high-efficiency encoding unit that performs high-efficiency encoding on the second image to generate encoded data; and a recording and transmitting unit that records and transmits the encoded data to an arbitrary medium. . 7. The image recording and transmitting apparatus according to claim 6, wherein a frequency characteristic of the second filter changes according to a recording capacity of the recording medium or a transmission capacity of the transmission medium. 8. The apparatus according to claim 2, wherein said first high-efficiency encoding means is different from said second high-efficiency encoding means.
5. The image recording and transmitting device according to 3 or 4. 9. The image recording and transmitting apparatus according to claim 2, wherein the first encoded data and the second encoded data can be decoded by the same decoder. 10. The image recording and transmitting apparatus according to claim 2, wherein at least one of said first high-efficiency encoding means and said second high-efficiency encoding means conforms to MPEG. . 11. An image recording and transmitting apparatus according to claim 2, wherein vector quantization is used for said second high efficiency encoding means. 12. The image recording and transmitting apparatus according to claim 6, wherein said high-efficiency encoding means conforms to MPEG. 13. N = 1280, N = 720, K = 72
9. The image recording and transmitting apparatus according to claim 2, wherein 0, L = 480, and K = 1. 14. N = 1280, N = 720, K = 72.
6. The image generating apparatus according to claim 1, wherein 0, L = 480, and K = 1. 15. The image recording and transmitting apparatus according to claim 2, wherein the filter is a wavelet filter. 16. An image generating apparatus according to claim 1, wherein said filter is a wavelet filter.