JPH08191446A - Image transmitter and image recorder - Google Patents

Abstract

PURPOSE: To arrange much more coding data at a high frequency in a prescribed SYNC block when image data are subject to high efficiency coding and the resulting data are transmitted. CONSTITUTION: A coding pack processing circuit 104 is used to rearrange quantization conversion data received via a DCT circuit 102 and a quantization circuit 103. High efficiency coding is applied to image data comprising two blocks A, B. For example, when number of quantized DCT coefficients significant and to be sent is three for the block A and four for the block B, the data are coded into coding data comprising respectively 3, 4 code words. Then low- order bits of the code word by a prescribed bit number are separated and arranged with respect to the coded data of each block. When the data of the block B are not contained in a prescribed SYNC blocks, the low-order bits of the code words are separated and stored in idle areas of the block A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission apparatus for highly efficiently encoding image data for transmission or recording.

[0002]

2. Description of the Related Art In recent years, digital processing of video signals has been performed in various fields. Among them, a commonly used high-efficiency coded transmission method of a video signal will be described with reference to FIG. FIG. 1 is a block diagram showing a general configuration of an image transmission device which is the basis of the present invention.

In FIG. 1, an image transmission apparatus includes a blocking circuit 101, a DCT circuit 102, a quantization circuit 103,
Encoding and packing circuit 104, transmitter 105 (recorder when transmission is recording), transmission path 106 (recording medium when transmission is recording), receiver 107 (reproducing device when transmission is recording), unpacking Decoding / decoding circuit 108, inverse quantization circuit 1
09, IDCT circuit 110, deblocking circuit 111
It is configured to include.

The operation of the image transmission apparatus thus configured will be described. The input digital image data is rearranged in pixel data by the blocking circuit 101,
Pixel data is output for each block including a predetermined number of pixel data. The DCT circuit 102 performs DCT on the pixel data for each block to generate DCT coefficient data (converted data). The quantization circuit 103 quantizes the DCT coefficient data with a predetermined quantization characteristic, and quantizes and transforms the data (coefficient value).
Is output.

Next, the coding pack forming circuit 104 performs variable length coding on the quantized transform data to generate coded data, and arranges the coded data in a predetermined storage area (for example, a sync block). And the image transmission device is a VTR
In this case, the coding pack forming circuit 104 arranges the coded data in a predetermined sync block so as to be determined on a one-to-one basis for each predetermined block or block combination (multi-block) so as to facilitate high-speed reproduction. The number of quantized conversion data transmitted for each block is not constant, and data delimiter information for each block is required. As the delimiter information, EO is added after the last encoded data for each block.
There is a method to add B (End Of Block).

Although not shown here, the number of quantized conversion data transmitted for each block is transmitted as additional information.
The transmitter 105 adds an error correction code and / or modulates the encoded data obtained by the encoding / packaging circuit 104, and outputs the encoded data to the transmission line 106 or records it on a recording medium.

The receiver 107 receives the signal transmitted through the transmission line 106 or the recording medium, performs demodulation and signal processing of error correction code, and obtains encoded data. The unpacking decoding circuit 108 performs an arrangement process that is the reverse of the arrangement process performed by the encoding pack circuit 104 on the data output from the receiver 107, and generates encoded data. Further, the unpacking / decoding circuit 108 uses the coding / packaging circuit 104.
Decoding, which is the reverse processing of the variable length coding performed in step 1, is performed and quantized conversion data is output.

The inverse quantization circuit 109 performs inverse quantization, which is the inverse transformation of the quantization characteristic of the quantization circuit 103, on the quantized transformation data from the unpacking decoding circuit 108, and D
Output CT coefficient data. The IDCT circuit 110 converts the DCT coefficient data output from the inverse quantization circuit 109 into an inverse DCT.
To generate image data. Deblocking circuit 1
Reference numeral 11 rearranges the image data output from the IDCT circuit 110 in the reverse order of the blocking circuit 101 and outputs the image data.

Next, a conventional arrangement method of encoded data in the encoding pack forming circuit 104 will be described with reference to FIG. In FIG. 12, in order to simplify the description, it is assumed that high-efficiency coding is performed on the image data made up of two blocks (a rectangular area consisting of 8 pixels both horizontally and vertically) A and B. As shown in FIG. 12A, as a result of encoding, there are three A blocks and four B blocks.
It is encoded into encoded data consisting of one codeword.

In the conventional arrangement method, as shown in FIG. 12B, after the arrangement, the encoded data W _{A1 of} the A block,
The W _A2, W _A3 sink block A, the encoded data W of the B block _B1, W _B2, and some W _B3 of W _B3 'is arranged in the sync block B. Then, the remaining W _B3 ″ of the encoded data W _{B3 that} has not been stored in the predetermined sync block (the storage area of the fixed bit length L) and the other encoded data W _B4 are empty sync blocks (the rear part of the sync block A). ).

[0011]

Consider a case where an image transmission apparatus for a recording medium such as a magnetic tape is used as a transmission path, that is, an image compression type digital VTR. In the digital VTR, the important data of each block (usually the low frequency component of DCT) is arranged in the sync block corresponding to each block. During special playback of the digital VTR, if important data is contained in the sync block that can be played back, the encoded data of the sync block can be decoded and the image data of the block corresponding to this sync block can be output.

However, according to the conventional method described with reference to FIG. 12, since the low-frequency component and the high-frequency component of the quantized and transformed data are sequentially arranged and recorded in the sync block, when the sync block cannot be fully filled, another sync block is recorded. There was a problem that the high frequency component contained therein was not reproduced at the time of special reproduction, and the definition of reproduced image quality was lowered.

Further, there is a similar problem in ATM (asynchronous packet transmission). That is, there is a problem in that there are priority packets (corresponding to sync blocks) that are not discarded in ATM and non-priority packets that may be discarded, and the high frequency components placed in the non-priority packets may be discarded. there were.

The present invention has been made in view of the above conventional problems, and it is a packet at the time of special reproduction of a digital VTR for recording a video signal by performing image compression or at the time of ATM transmission of a digital video device. Even at the time of disposal,
A first object of the present invention is to provide an image transmission device that reproduces more high-frequency components than ever before and has less deterioration in definition.

Further, in an image recording apparatus such as an electronic still camera, image data is compressed and recorded in a recording medium such as an IC memory card by high efficiency coding. In this case, if the quantization characteristic is roughened, the code amount (total number of bits of compressed image data) decreases. By utilizing this, the code amount per image can be controlled. Therefore, by controlling the code amount per image to be a constant value, the number of recordings on the IC card can be made constant. However, an image that is difficult to compress (for example, an image having many fine pattern portions) has a drawback that the quality is deteriorated. On the other hand, for an image that is easy to compress, there is a problem that unnecessary quantization bits are recorded, that is, useless bits are recorded. If the quantization characteristic is constant so that an image of a predetermined quality can be obtained, the number of images recorded on the IC card cannot be constant because the code amount for each image is not constant.

Therefore, the present invention is to provide an image recording apparatus capable of recording the number of recordings on a recording medium (such as an IC card) and recording an image that is difficult to compress without causing significant deterioration. The purpose is 2.

[0017]

According to the invention of claim 1 of the present application, image data is input, high-efficiency encoding is performed, and the obtained converted data is packed in a sync block which is a transmission unit.
High-efficiency encoding means for obtaining compressed image data, transmitting means for transmitting compressed image data output from the high-efficiency encoding means to a transmission path, receiving means for receiving compressed image data from the transmission path, and receiving means from the receiving means A high-efficiency coding / decoding means for decoding compressed image data to obtain image data, wherein the high-efficiency coding means divides the image data into blocks each having a predetermined number of pixels, Transform quantizing means for orthogonally transforming the pixels of each block, and quantizing the orthogonally transformed data to obtain quantized transformed data;
The bit length of the code word to be the quantized conversion data is determined, and is divided into a first bit pattern part forming the upper bits and a second bit pattern part forming the lower bits of the code word. Variable-length coding to generate coded data, and the coded data of a multi-block consisting of a predetermined number of blocks is arranged in a sync block corresponding to the multi-block. Variable length coding means arranged in another sync block, wherein the variable length coding means is such that the coded data of the quantized transform data in a predetermined range of the coded data of the multiblock corresponds to the multiblock. If it does not fit in the sync block, it is necessary to separate the predetermined lower bits of the second bit pattern part and place them in other sync blocks. It is an butterfly.

According to a second aspect of the present invention, high efficiency coding means for inputting image data to perform high efficiency coding, packing the obtained converted data in a sync block which is a transmission unit, and obtaining compressed image data. A transmitting means for transmitting the compressed image data output from the high efficiency encoding means to the transmission path, a receiving means for receiving the compressed image data from the transmission path, and decoding the compressed image data from the receiving means to generate the image data. An image transmission apparatus comprising: a high-efficiency coding / decoding means to be obtained, wherein the high-efficiency coding means divides the image data into blocks each having a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantization means for quantizing orthogonally transformed data to obtain quantized transformed data, variable length coding of the quantized transformed data to generate encoded data, and from a predetermined number of blocks Variable-length coding means for arranging the encoded data of the multi-block in a sync block corresponding to the multi-block, and the bits of the encoded data that do not fit in the sync block are arranged in another sync block. When the encoded data does not fit into the corresponding sync block when transmitting the encoded data, the long encoding unit quantizes the quantum conversion data with the second quantization characteristic having a smaller code amount than the first quantization characteristic, and obtains the obtained quantum. The number of bits corresponding to the difference between the total number of bits of the encoded data having the first quantization characteristic and the total number of bits of the encoded data having the second quantization characteristic, which are variable length encoded and arranged in the sync block. Only, it is possible to perform packing so that a part of the lower bits lost by the quantization of the second quantization characteristic is placed in the corresponding sync block or another sync block. It is an butterfly.

According to a third aspect of the present invention, high efficiency encoding means for inputting image data, performing high efficiency encoding, packing the obtained converted data in a sync block which is a recording unit, and obtaining compressed image data. A transmitting means for transmitting the compressed image data output from the high-efficiency encoding means to the transmission path, a receiving means for reproducing the compressed image data from the transmission path, and decoding the compressed image data from the reproducing means to generate the image data. An image transmission apparatus comprising: a high-efficiency coding / decoding means to be obtained, wherein the high-efficiency coding means divides the image data into blocks each having a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and a first bit pattern for determining a bit length of a codeword to be quantized transformed data and forming upper bits. Section and a second bit pattern section that constitutes the lower bits of the code word, variable length coding the quantized conversion data to generate coded data, and the coded data are respectively arranged in the storage areas. The coded data that does not fit in the storage area has variable length coding means arranged in another storage area, and is coded data per image obtained by coding by the high efficiency coding means. If the first quantization characteristic is a quantization characteristic whose code amount of is the target code amount, and the first quantization characteristic is finer than the second quantization characteristic that provides a predetermined image quality, The quantization means performs quantization with the first quantization characteristic to obtain quantized transform data, and the variable length coding means performs variable length coding on the quantized transform data of the transform quantization means to obtain the coded data. , Equal to the second quantization characteristic, First encoded data unit over picture quality is made from the upper bit portion obtained,
And a second coded data part consisting of other lower bits and arranged in the storage area, and the code amount of the coded data per image obtained by coding by the high efficiency coding means is almost the target. When the first quantization characteristic that is the code amount is coarser than the second quantization characteristic that provides a predetermined image quality,
The transform quantization means performs quantization with the second quantization characteristic to obtain quantized transform data, and the variable length coding means performs variable length coding on the quantized transform data of the transform quantization means. The data is a first coded data part having a total number of bits equal to the target code amount, the first coded data part having an upper bit part capable of obtaining an image quality close to the first quantization characteristic, and the second code having another lower bit. The first coded data part is arranged in a predetermined storage area that is determined for each image separately from the coded data part, and the second coded data part is vacant in the storage area or another stored area. The present invention is characterized in that the compressed image data arranged here is transmitted by being overwritten and arranged in a vacant area of the area and an area in which the second coded data section is arranged.

According to a fourth aspect of the present invention, high efficiency encoding means for inputting image data, performing high efficiency encoding, packing the obtained converted data in a sync block which is a recording unit, and obtaining compressed image data. A recording means for recording the compressed image data output from the high efficiency encoding means on a recording medium; a reproducing means for reproducing the compressed image data from the recording medium; and a compressed image data from the reproducing means for decoding the image data. An image recording device comprising:
The high-efficiency encoding means divides the image data into blocks each having a predetermined number of pixels, orthogonally transforms the pixels in each block, and quantizes the orthogonally transformed data to obtain quantized transformed data. The bit length of the code word to be the quantized conversion data is determined and divided into a first bit pattern part that constitutes the upper bits and a second bit pattern part that constitutes the lower bits of the code word. Variable-length code in which the quantized converted data is variable-length coded to generate coded data, and the coded data is placed in each storage area, and the coded data that does not fit in the storage area is placed in another storage area. And a quantization characteristic in which the code amount of the encoded data per image obtained by encoding by the high-efficiency encoding device is the target code amount is the first quantization characteristic. , If the first quantization characteristic is finer than the second quantization characteristic with which a predetermined image quality is obtained, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transformed data, The variable-length coding means variable-length-codes the quantized transform data of the transform-quantizing means to obtain the coded data from the higher-order bit part that has an image quality equal to or higher than the second quantization characteristic. The first encoded data part and the other second encoded data part consisting of lower bits are arranged in the storage area separately, and the image is obtained by encoding with the high-efficiency encoding means. When the first quantization characteristic in which the code amount of the encoded data is almost the target code amount is coarser than the second quantization characteristic in which a predetermined image quality is obtained, the transform quantization unit uses the second quantization characteristic. Quantized to obtain quantized transformed data, and variable length code Means for variable-length-encoding the quantized transformed data of the transform quantizing means, coded data obtained by the variable-quantization means, with the total number of bits equal to the target code amount, and having an image quality close to the first quantization characteristic The first coded data part is composed of a first coded data part and a second coded data part composed of other lower bits, and the first coded data part is arranged in a predetermined storage area determined for each image. At the same time, the second coded data section may be overwritten and arranged in the empty area of the storage area or the empty area of another storage area that has already been arranged, and the area in which the second coded data section is arranged. It is a feature.

According to a fifth aspect of the present invention, high-efficiency encoding means for inputting image data, performing high-efficiency encoding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data. A transmission means for transmitting the compressed image data output from the high-efficiency encoding means to a transmission path, a reproducing means for reproducing the compressed image data from the transmission path, and decoding the compressed image data from the reproducing means to generate the image data. An image transmission apparatus comprising: a high-efficiency coding / decoding means to be obtained, wherein the high-efficiency coding means divides the image data into blocks each having a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and a first bit pattern for determining a bit length of a codeword to be quantized transformed data and forming upper bits. Section and a second bit pattern section that constitutes the lower bits of the code word, variable length coding the quantized conversion data to generate coded data, and the coded data are respectively placed in the storage areas. However, the coded data that does not fit in the storage area has variable length coding means arranged in another storage area, and is coded per image obtained by coding by the high efficiency coding means. When the first quantization characteristic in which the code amount of data is the target code amount is smaller than the second quantization characteristic in which a predetermined image quality is obtained, the transform quantization unit quantizes with the first quantization characteristic. To obtain the quantized transform data, and the variable-length coding unit variable-length-codes the quantized transform data from the transform-quantizing unit to obtain the coded data that is equal to or greater than the second quantization characteristic. High-order bit that can obtain the above image quality First encoded data unit consisting of, and a second consisting of the other lower bits of
The first quantization characteristic is such that the target code amount is the code amount of the coded data per image obtained by encoding the image data in the storage area separately from the encoded data part of , If the image quality is coarser than the second quantization characteristic that gives a predetermined image quality, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transform data, and the variable length coding means transforms The encoded data obtained by variable-length encoding the quantized transformed data from the quantizing means is arranged in a storage area determined for each image, and the total number of bits of the encoded data in the first quantization characteristic and the second The lower bit information below the decimal point of the quantized conversion data lost by the rounding process of quantization by the number of bits corresponding to the difference from the total number of bits of the encoded data of the Free space in the storage area for other images, or Encoded data of 2 is arranged overwritten regions are arranged, is characterized in transmitting the compressed image data arranged here.

According to a sixth aspect of the present invention, high-efficiency encoding means for inputting image data, performing high-efficiency encoding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data. A recording means for recording the compressed image data output from the high efficiency encoding means on a recording medium; a reproducing means for reproducing the compressed image data from the recording medium; and a compressed image data from the reproducing means for decoding the image data. An image recording device comprising:
The high-efficiency encoding means divides the image data into blocks each having a predetermined number of pixels, orthogonally transforms the pixels in each block, and quantizes the orthogonally transformed data to obtain quantized transformed data. Quantization means, a bit length of the code word that is the quantized converted data is determined, and divided into a first bit pattern portion that configures the upper bits and a second bit pattern portion that configures the lower bits of the code word. Then, the quantized converted data is variable length coded to generate coded data, and the coded data is placed in each storage area, and the coded data that does not fit in the storage area is placed in another storage area. A first quantization characteristic in which the code amount of the coded data per image obtained by encoding by the high efficiency encoding device is the target code amount. quality When the obtained second quantization characteristic is finer, the transform quantization means quantizes with the first quantization characteristic to obtain quantized transform data, and the variable length coding means quantizes from the transform quantization means. Coded data obtained by variable-length coding the coded converted data, a first coded data part including a high-order bit part capable of obtaining an image quality equal to or higher than the second quantization characteristic, and other It is arranged in the storage area separately from the second encoded data part consisting of lower bits,
The first quantization characteristic in which the target code amount is the code amount of the encoded data per image obtained by encoding by the high efficiency encoding means is more than the second quantization characteristic in which a predetermined image quality is obtained. If it is also rough, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transform data, and the variable length coding means performs variable length coding on the quantized transform data from the transform quantization means. The obtained encoded data is arranged in a storage area determined for each image, and the difference between the total number of bits of encoded data having the first quantization characteristic and the total number of bits of encoded data having the second quantization characteristic is set. Corresponding number of bits, lower-order bit information below the decimal point of the quantized conversion data lost in the rounding process of quantization, the free space of the storage area, the free area of the storage area of the other image that has been arranged, or the second Overlays the area where the encoded data section is located. It is characterized in that arranged in writing.

[0023]

According to the invention of claim 1 of the present application having such a feature, the variable-length codeword is separately recorded in the first bit pattern portion and the second bit pattern portion. Therefore, even if the number of pieces of coded data arranged in a given sync block is increased and a part of the coded data arranged in another sync block cannot be obtained, the first bit pattern in each sync block can be obtained. Partial data is preferentially handled, and more high frequency components are decoded at the time of decoding.

Further, according to the invention of claim 2 of the present application, since the quantization is performed with the quantization characteristic in the direction in which the code word decreases, the number of blocks arranged in a predetermined sync block increases. Therefore, when decoding in sync block units, more high-frequency components are decoded than before.

According to the third or fourth aspect of the present invention, the first coded data part that obtains a predetermined image quality and the second coded data part that affects the image quality more than necessary are separately arranged. . Therefore, while maintaining a predetermined image quality, the number of allocated bits can be increased only for the second coded data portion for an image that is difficult to compress, and even an image that is difficult to compress can be transmitted or recorded without causing significant deterioration. .

According to the fifth or sixth aspect of the present invention, the first coded data part that obtains a predetermined image quality and the second coded data part that has an image quality higher than necessary are separately arranged. . Therefore, while maintaining a predetermined image quality, the number of allocated bits can be increased only for the second coded data portion for an image that is difficult to compress, and even an image that is difficult to compress can be transmitted or recorded without causing significant deterioration. .

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image transmission device in each embodiment of the present invention will be described with reference to the drawings. (Embodiment 1) The image transmission apparatus of the first embodiment is based on a general one configured as shown in FIG. 1, and since the basic operation of the whole is the same as the conventional example, detailed description of the drawing is omitted. To do. Only the points different from the conventional one will be described with reference to FIGS.

FIG. 2 is an explanatory diagram showing the operating principle of the image transmission apparatus according to the first embodiment of the present invention. This figure particularly relates to the operation of the encoding and packing circuit 104 of FIG. 1 and shows a data arrangement method. In FIG. 2, for simplification of explanation, for the image data made up of two blocks (a rectangular area consisting of 8 pixels both horizontally and vertically) A and B,
High efficiency coding shall be performed. As shown before the arrangement in FIG. 2A, the number of significant quantized DCT coefficients to be transmitted as a result of the quantization in the quantization circuit 103 is 3 in the A block.
It is assumed that there are four in the B block. In block A, coded data W _A1 , W _A2 , and W _A3 are coded. Further, in block B, four encoded data W _B1 , W _B2 , W _B3 , W
_It is encoded in _B4 .

In this embodiment, the coded data W of each block is separated by a predetermined number of bits as the lower bits of the code word and arranged as shown in the halftone dot area of FIG. Figure 2
As shown on the left side of (a), since the encoded data of the B block does not fit in the sync block having a predetermined length, the lower bits of the code word are separated by a predetermined number of bits. That is, each code word of the encoded data W _{B1 to} W _B4 is divided into a first bit pattern portion W _B1 'to W _B4 ' and a second bit pattern portion W _B1 "to W _B4 ", respectively. And Figure 2
As shown on the right side of (b), W _B1 'to W _B4 ' are arranged in order. Next, as shown in the left side of FIG. _{2 (b), W B1 "} ~W
_B4 ″ is placed in an empty area of sync block B.

Here, a concrete explanation will be given by using FIG. 3 in comparison with the method of arranging the code words of the first embodiment and the conventional method. FIG. 4 is a diagram showing coding codes for coefficient values generated by the quantization circuit 103. For example, as an example of variable length coding in the coding pack forming circuit 104, JPEG is used.
Consider a variable length code such as. The quantized transform coefficients (coefficient values) -31 to 31 are classified into a plurality of classes (6 classes in FIG. 4) according to their absolute values, and the class number 0 is assigned to each class.
~ 5 is attached.

A 2-digit or 3-digit class code is assigned to each class number. This class code corresponds to the high-order bit of the code word, and the other low-order bits of the code word are represented by the additional bit code assigned to each class in a small order (with a positive / negative sign). That is, a code word in JPEG or the like has a configuration in which a class code (upper bit) and an additional bit code (lower bit) are connected by variable length coding. Therefore, the code length of the code word is determined by the class code.

For example, the quantized DCT coefficients of the A block and B block are [3, 0, 2], [18, 10,
8, 7]. For example, if the coefficient value is 3, the class number is 2 from FIG. 4, the class code is 3 digits (011), the code length of the additional bits is 2, and the overall code length is 5.
And the codeword is represented by (01111). Similarly, if the coefficient value is 18, the class number is 5, the class code is 3-digit (110), the code length of additional bits is 5, the overall code length is 8, and the codeword is (11010010). Expressed. From this, it can be seen that the amount of code after the block after the variable length coding is (011110001110), which is 1 in total.
2 bits, B block (110100101011010101101100010)
0111) in total 28 bits.

FIG. 5 is a list specifically showing each code word for each coefficient value of the sync block A and the sync block B as described above. As shown in FIG. 3, the allowable bit capacity L of one sync block is 20 bits. The code data of each block is arranged by separating the lower bits of each code word. In the conventional method, they are arranged as shown in FIG. 3A, and in the method of this embodiment, they are arranged as shown in FIG. 3B. Here, in the data of the block B of this method, the data that does not fit in the sync block B is arranged in the empty area of the sync block A.

FIG. 6 is an explanatory diagram comparing the decoding operation during the special reproduction of the digital VTR between the conventional method and this method. When decoding can be performed only in sync block units as in trick play, the code word and coefficient value of sync block A shown in FIG. 6 are decoded in both the conventional method and the present method. However, with respect to the sync block B, in the conventional method, only the three DCT coefficients are decoded from the low frequency band, and the fourth codeword is not known at all, so the sync block B is decoded as 0. On the other hand, in this method, the lower bit of sync block B? ? As shown by, the four DCT coefficients are decoded together, although the decoding accuracy is slightly lowered. That is, this system can reproduce an image up to a higher frequency component than the conventional system.

As described above, when the arrangement method according to the present embodiment is used in the image transmission apparatus, more high frequency data can be reproduced in the sync block unit reproduction than in the conventional method, so that the resolution of the image at the time of reproduction is high. Part deterioration can be greatly reduced. As the coded data arrangement method to be stored in a predetermined sync block, the same arrangement method as the conventional method can be used by recording additional information indicating that the encoded data is stored in the predetermined sync block.

Here, the blocking circuit 101, the DCT circuit 102, the quantization circuit 103, and the coding pack forming circuit 10
Reference numeral 4 constitutes a high efficiency encoding means for inputting image data, performing high efficiency encoding, packing the obtained converted data in a sync block which is a transmission unit, and obtaining compressed image data. Further, the unpacking decoding circuit 108, the dequantization circuit 109, the IDCT circuit 110, and the deblocking circuit 111 constitute a high efficiency code decoding means for decoding the compressed image data from the receiver 107 to obtain the image data.
The DCT circuit 102 and the quantization circuit 103 divide the image data into blocks each having a predetermined number of pixels, orthogonally transform the pixels in each block, and quantize the orthogonally transformed data to perform quantization transformation. It constitutes a transform quantization means for obtaining data.

Further, the encoding / packaging circuit 104 determines the bit length of the code word to be the quantized conversion data, and the first bit pattern portion forming the upper bit and the second bit pattern forming the lower bit of the code word. And the quantized transform data is variable length coded to generate coded data, and the multi-block coded data consisting of a predetermined number of blocks is placed in the sync block corresponding to the multi-block. The coded data that does not fit in the corresponding sync block has the function of the variable length coding means arranged in another sync block.

(Embodiment 2) Next, an image transmission apparatus according to a second embodiment of the present invention will be described. The image transmission apparatus of the present embodiment is also based on that shown in FIG. 1, and since the basic operation of the whole is the same as that of the conventional example, detailed description of the drawing is omitted. Here, the points different from the conventional one will be described mainly with reference to the drawings from FIG.

FIG. 7 shows an encoding / packing circuit 1 according to the second embodiment.
FIG. 4 is an explanatory diagram showing an arrangement method of encoded data in 04. Here, description will be given with reference to FIGS. 3 and 7. In FIG. 7, in order to simplify the description, it is assumed that high-efficiency encoding is performed on the image data made up of two blocks (rectangular area consisting of 8 pixels both horizontally and vertically) A and B. Consider the case where the number of significant quantized DCT coefficients to be transmitted as a result of the quantization is three in the A block and four in the B block. In this case, as in the first embodiment, each three
One is encoded into encoded data composed of four codewords.

In this embodiment, the Huffman code word shown in FIG. 4 is divided into a code word representing a class and a code word representing an additional bit as shown in FIG. 7A and recorded. In this embodiment, as shown in FIG. 7B, the code word representing the additional bit is 1
The bits are arranged bit by bit from the back to the front of a predetermined sync block to form a bit stream. Then, the data that does not fit in a predetermined sync block is arranged bit by bit in an empty area of another sync block.

In FIG. 7, data having "'" attached to the data of each block is a code word representing a class, and data having """is a code word representing an additional bit. Since the data of the sync block B does not fit in the sync block of the predetermined length, the lower bits of W _B1 ″ to W _B4 ″ are separated and placed in the empty area of the sync block A bit by bit. If a gap is created in the sync block B, lower bits may be filled in this gap as well.

As described above, when the arrangement method according to the present embodiment is used in the image transmission apparatus, more high frequency data can be reproduced in the sync block unit reproduction than in the conventional method, and the fine portion of the image during reproduction is deteriorated. Can be significantly reduced.

(Third Embodiment) Next, an image transmission apparatus according to a third embodiment of the present invention will be described. The image transmission apparatus of the present embodiment is also based on the one shown in FIG. 1, and the basic operation of the whole is the same as that of the conventional example, so a detailed description of the drawing is omitted. Here, differences from the conventional example will be described with reference to FIG.

FIG. 8 is an explanatory diagram showing the operation of the encoding / packing circuit 104 of the third embodiment. Also in this case, for the sake of simplicity, it is assumed that the high-efficiency coding is performed on the image data composed of two blocks (a rectangular area consisting of 8 pixels both horizontally and vertically) A and B. As shown in FIG. 8A, it is assumed that, as a result of the quantization, the number of significant quantized DCT coefficients to be transmitted is three in the A block and four in the B block. In this case, they are encoded into three and four encoded data, respectively.

The A block is quantized in the quantization step QA, and the B block is quantized in the quantization step QB. At this time, if the encoded data of the B block does not fit in the predetermined sync block, the data of the B block is quantized in the quantization step QC in which the code amount is smaller than QB.

Then, as shown in FIG. 8A, the data of the A block is arranged in order, and the data of the B block is the data (W _{C1 to} W _C4 ) quantized in the quantization step QC. After that, a bit (LA bit) of the difference between the code amount when quantized in the quantization step QB and the code amount when quantized in the quantization step QC is generated. Then, as shown on the left side of FIG. 8B, the lower bits lost when the quantization is performed in the quantization step QC are arranged in the gap of the sync block generated here.

As described above, when the arrangement method according to the present embodiment is used for the image transmission apparatus, more high-frequency data can be reproduced in sync block unit reproduction than in the conventional method. Deterioration of parts can be greatly reduced.

Here, the coding pack forming circuit 104 variable-length-codes the quantized transform data to generate coded data, and multi-block coded data consisting of a predetermined number of blocks corresponds to the multi-block. Bits of coded data that are arranged in sync blocks and that do not fit in the sync blocks constitute variable length coding means that are arranged in other sync blocks.

(Embodiment 4) Next, an image recording apparatus according to a fourth embodiment of the present invention will be described. In the image recording apparatus of this embodiment, the transmitter 105 shown in FIG.
It is assumed that the transmission path 106 is a recording medium 106 'and the transmitter 107 is a regenerator 107'. The basic operation of the whole is the same as that of the image transmission apparatus of the first to third embodiments, and detailed description thereof will be omitted. Here, differences from the conventional example will be described with reference to FIG.

FIG. 9 is an explanatory diagram showing the operation of the coding blocking circuit 104 in the fourth embodiment. Here, for ease of explanation, the number of images to be transmitted (recorded) is two. Then, it is assumed that the image data composed of the two images A and B is subjected to high efficiency coding and transmitted (recorded). In addition, each image has data of the number of bits such that the target code amount after compression becomes equal,
Store in the same capacity storage area.

The quantization characteristic QZ shown in FIG. 9A is a reference quantization characteristic with which a predetermined or higher image quality can be obtained if the quantization characteristic is finer than this. In order to guarantee the number of recordings, the quantization characteristic is changed and the target value of the code amount of each image is set. The quantization characteristic that is the target value is referred to as a quantization characteristic QR (first quantization characteristic), which is displayed as QA in image A and QB in image B. In an image that can be easily compressed like the image A, the quantization characteristic QR is finer than the quantization characteristic QZ (second quantization characteristic), and a sufficient image quality can be obtained. If the image is difficult to compress like the image B, the quantization characteristic Q
R becomes coarser than the quantization characteristic QZ, and the image quality becomes lower than a predetermined value.

Since the image A is easy to compress and the image B is difficult to compress, the image quality of the image B is insufficient if the code amount control is performed in order to guarantee the number of recording sheets as in the conventional case. It becomes a thing. Therefore, in the present embodiment, even after the image A is compressed and the coded data quantized with the quantization characteristic QA is arranged, a part of the data of the image A is deleted and used as the allocation storage area for the image B, and the image B Arrange the encoded data of. That is, the allocated code amount is increased and the image quality of the image B is improved.

Even in this case, a portion (first encoded data portion) where the image quality of a predetermined level or more is obtained and the image quality of the image A from which a part of the data has been deleted are kept so as not to fall below the predetermined image quality. The encoded data is arranged separately from the other portion (second encoded data portion). The removed part is the second coded data part, and the part of low importance (high-frequency component, low-order bit or combination thereof) even when removing this part
Remove from.

Here, the quantization characteristics QA and QZ have the same quantization step for each DCT coefficient, or 2
This relationship can be easily realized if there is a magnitude relation of powers of. The first encoded data part in this case is
It is almost equal to the encoded data obtained by quantization with the quantization characteristic QZ.

Now, the operation of the encoding and packing circuit 104 will be described with reference to FIG. 9 by taking as an example a case where two images A and B are compressed and recorded in order. In step 1 of FIG. 9A, CZA and CZB represent coded data when the images A and B are respectively quantized with a predetermined quantization characteristic QZ and coded. Further, CRA and CRB respectively represent coded data obtained by performing code amount control and quantizing the images A and B so that the images are stored in a predetermined storage area and coding.
The image A is quantized with the quantization characteristic QA, and the image B is quantized with the quantization characteristic QB. Here, the quantizing characteristic QA is a finer quantizing characteristic than the quantizing characteristic QZ which is a reference of image quality, and the quantizing characteristic QB is a coarser quantizing characteristic than the quantizing characteristic QZ.

In step 2 of FIG. 9B, CRA
Is coded data obtained by quantizing the image A with the quantization characteristic QA and coding. CRA1 is the standard quantization characteristic QZ.
, Which is a first coded data part composed of high-order bit parts, and CRA2 is a second coded data part other than that, and CRA1 and CRA can be reproduced.
Place 2 as shown.

In step 3 of FIG. 9C, CZB
Is coded data obtained by quantizing the image B with the standard quantization characteristic QZ and coding. The CZB1 is stored in a predetermined storage area B of the CZB, can reproduce the same image quality as that quantized by the quantization characteristic QB, and is composed of a high-order bit portion.
Is the encoded data part of the. CZB2 is the other second encoded data section.

The first coded data part (CZB1) is arranged in a predetermined storage area B, and the second coded data part is a free area in the storage area B, a free area in the storage area A and the second code. Overwrite in a part (hatched portion in the figure) of the area where the encoded data portion is arranged and arrange. In this embodiment, the second
If overwriting occurs in the encoded data portion of, the additional information indicating this is recorded.

By using the arranging method of this embodiment in the image recording apparatus, it is possible to prevent the reproduced image quality from being significantly deteriorated as compared with the conventional method by utilizing the variation in the information amount of each image. . Although two images are used in this embodiment, the number of images is not limited to two. Also, although one storage area is used as a storage area for one image, a smaller storage area (for example, a sync block) may be used as a unit to form a plurality of storage areas, and data may be arranged in sync block units. You can go. If the two images A and B are both quantized with the quantization characteristic QZ and cannot be stored in the storage area, the image quality is the same as the conventional one, but if the number of images is large, the probability of creating an empty area usually increases. , The practical effect will be great. Two images A and B are recorded on the recording medium 10.
Although the operation of recording in 6'has been described, the same can be said for the case of transmitting at a constant bit rate as in the first to third embodiments.

Here, the blocking circuit 101, the DCT circuit 102, the quantization circuit 103, and the coding pack forming circuit 10
Reference numeral 4 constitutes high efficiency encoding means for inputting image data, performing high efficiency encoding, packing the obtained converted data in a sync block which is a recording unit, and obtaining compressed image data. Further, the unpacking decoding circuit 108, the inverse quantization circuit 109, the IDCT circuit 110, the deblocking circuit 1
Reference numeral 11 constitutes high-efficiency code decoding means for decoding compressed image data from the regenerator 107 'to obtain image data.
The DCT circuit 102 and the quantization circuit 103 divide the image data into blocks each having a predetermined number of pixels, orthogonally transform the pixels in each block, and quantize the orthogonally transformed data to perform quantization transformation. It constitutes a transform quantization means for obtaining data.

The recorder 105 'constitutes recording means for recording the compressed image data output from the encoding / packaging circuit 104 on a recording medium. And the encoding pack forming circuit 1
04 is a first bit pattern portion that determines the bit length of the code word to be the quantized conversion data and constitutes the upper bits,
And a second bit pattern part forming the lower bits of the code word, variable length coding the quantized conversion data to generate coded data, and the coded data are respectively arranged in a storage area and stored. Coded data that does not fit in the area constitutes variable length coding means that is arranged in another storage area.

(Embodiment 5) Next, an image recording apparatus according to a fifth embodiment of the present invention will be described. The image recording apparatus of this embodiment is also based on the one shown in FIG.
This is the same as the case of the fourth embodiment. Here, differences from the conventional example will be described with reference to FIG.

FIG. 10 is an explanatory diagram showing the operation of the code pack circuit 104 of the fifth embodiment. Also in this case, the number of images to be recorded is two for ease of explanation. And 2
It is assumed that the image data consisting of the two images A and B is subjected to high-efficiency coding and recorded on the recording medium 106 '. Further, it is assumed that each image is arranged in the storage area having the number of bits equal to the target code amount per one image after compression.

The quantization characteristic QZ shown in FIG. 10A is a reference quantization characteristic with which a predetermined or higher image quality can be obtained if the quantization characteristic is finer than this. In order to guarantee the number of recordings, the quantization characteristic is changed and the code amount of each image is set to a target value. The quantization characteristic that is the target value is the quantization characteristic QR,
Image A is displayed as QA, and image B is displayed as QB. In an image such as the image A that can be easily compressed, the quantization characteristic QR is finer than the quantization characteristic QZ, and sufficient image quality can be obtained. Further, in the case of an image such as the image B that is difficult to compress, the quantization characteristic QR becomes coarser than the quantization characteristic QZ, and the image quality becomes lower than a predetermined value.

Since the image A is easily compressed and the image B is difficult to compress, the image quality of the image B is insufficient if the code amount control is performed in order to guarantee the number of recordings as in the conventional case. It becomes a thing. Therefore, in this embodiment, even after the image A is compressed, quantized with the quantization characteristic QA, and the encoded data is arranged, a part of the data of the image A is deleted to obtain the encoded data of the image B. Deploy. That is, the allocated code amount is increased to improve the image quality of the image B.

Even in this case, a portion (first encoded data portion) where the image quality of a predetermined level or more is obtained and the image quality of the image A in which a part of the data is deleted are kept so as not to fall below the predetermined image quality. The encoded data is arranged separately from the other portion (second encoded data portion). The removed part is the second coded data part, and the part of low importance (high-frequency component, low-order bit or combination thereof) even when removing this part
Remove from.

Here, the quantization characteristics QA and QZ have the same quantization step for each DCT coefficient, or 2
This relationship can be easily realized if there is a magnitude relation of powers of. In this case, the first coded data portion is almost equal to the coded data obtained by quantization with the quantization characteristic QZ.

The operation will be described with reference to FIG. 10 by taking as an example the case where two images A and B are compressed and recorded in order. Figure 10
In step 1 of (a), CZA and CZB are coded data when the images A and B are respectively quantized with a predetermined quantization characteristic QZ and coded. Further, CRA and CRB are coded data which are coded by performing code amount control respectively and quantizing the images A and B so that they are stored in a predetermined storage area. The image A is quantized with the quantization characteristic QA, and the image B is quantized with the quantization characteristic QB. Here, the quantizing characteristic QA is a finer quantizing characteristic than the quantizing characteristic QZ which is a reference of image quality, and the quantizing characteristic QB is a coarser quantizing characteristic than the quantizing characteristic QZ.

In step 2 of FIG. 10B, CRA is coded data obtained by quantizing the image A with the quantization characteristic A and encoding the same. CRA1 is the reference quantization characteristic QZ.
This is the first coded data section that can reproduce the same image quality as that quantized by and is composed of the high-order bit section. CRA2 is the other second coded data section, and is arranged as shown.

In step 3 of FIG. 10C, CR
B is coded data which is obtained by quantizing the image B with the quantization characteristic QB and coding it, which is arranged in a predetermined storage area B. The empty area of the storage area B (the shaded area in the figure), the empty area of the storage area A (the shaded area in the figure), and a part of the area where the second coded data portion (CRA2) is arranged are overlapped. The lower bit information of the encoded data, which is lost by the rounding process of the quantization with the quantization characteristic QB, is arranged. At this time, if overwriting is performed on the second encoded data portion,
The additional information indicating that is recorded.

As described above, when the arrangement method according to the present embodiment is used for the image transmission device, it is possible to prevent the reproduced image quality from being greatly deteriorated by utilizing the variation in the information amount of each image.

Here, the encoding pack circuit 104 determines the bit length of the code word to be the quantized conversion data, and configures the first bit pattern portion forming the upper bits and the lower bit forming the code word. It is divided into two bit pattern parts and the quantized converted data is variable-length coded to generate coded data, and the coded data is arranged in the storage areas respectively, and the coded data that cannot fit in the storage area is Variable length coding means arranged in the storage area of the.

Although two images are used in this embodiment, the number of images is not limited to two. Further, although one storage area is used as a storage area for one image, a smaller storage area (for example, sync block) may be used as a unit and may be composed of a plurality of storage areas. Further, data may be arranged in sync block units. If the two images A and B are both quantized with the quantization characteristic QZ and cannot be stored in the storage area, the image quality is the same as the conventional one, but if the number of images is large, the probability of creating an empty area usually increases. , The practical effect will be great.

(Sixth Embodiment) Next, an image recording apparatus according to a sixth embodiment of the present invention will be described. The image recording apparatus of this embodiment is also based on the one shown in FIG.
This is the same as the case of the fourth embodiment. Here, differences from the conventional example will be described with reference to FIG.

FIG. 11 is an explanatory diagram showing the operation of the code pack circuit 104 of the sixth embodiment. Also in this case, the number of images to be recorded is two for ease of explanation. And 2
High-efficiency coding is performed on the image data composed of two images A and B, and the data is recorded. Further, it is assumed that each image is arranged in the storage area having the number of bits equal to the target code amount per one image after compression.

Step 1 in FIG. 11A shows a state in which encoded data is arranged in a storage area for N (here, N = 5) images. CR1 is coded data in which the image 1 is quantized with the quantization characteristic Q1 finer than the reference quantization characteristic QZ and encoded. CR11, CR
Reference numerals 12 are a first coded data section and a second coded data section, respectively. CR2 is encoded data in which the image 2 is quantized with the quantization characteristic Q2 finer than the reference quantization characteristic QZ and encoded. CR21 and CR22 are a first coded data section and a second coded data section, respectively.

CR3 is coded data obtained by quantizing the image 3 with the standard quantization characteristic QZ. CR4
Is the encoded data in which the image 4 is quantized with the quantization characteristic Q4 finer than the reference quantization characteristic QZ and encoded. CR41 and CR42 are respectively the first encoded data section,
This is the second encoded data part. CR5 is encoded data in which the image 5 is quantized and encoded with the standard quantization characteristic QZ. These are arranged in the storage areas 1 to 5 as shown.

Consider a case in which, for example, a situation in which another image has to be urgently recorded in this state. Specifically, when an electronic still camera whose recording medium is an IC card is assumed, another image may be recorded when the standard recording number of images has already been recorded. In this case, in step 2 of FIG.
Encoded data of another image 6 (hatched part in the figure)
Are overwritten and arranged in the empty areas of the storage areas 1 to 5 and the second encoded data portion.

By using the arranging method of this embodiment in the image recording apparatus, it is possible to arrange a predetermined number or more of images in a predetermined storage area without concentrating and degrading a specific image. . In the present embodiment, when overwriting occurs in the second encoded data portion, that fact is recorded as additional information. In addition, in the present embodiment, the arrangement method of the images 1 to 5 is the same as the arrangement method of the fourth embodiment.
The arrangement method as in the embodiment may be used. Further, the number of images is not limited.

As described in each of the above embodiments, the arrangement direction of the separated lower bits is not limited to the arrangement position as described above. Further, the arrangement method when arranging the data that does not fit in the storage area to be originally stored in the free area of the other storage area is not limited to the one described in the present embodiment, and for example, two or more It may be arranged so as to span the storage area. Also, two or more types of encoded data may be arranged in a free area of one storage area.

The number of blocks and the number of sync blocks in the first to third embodiments are not limited to those mentioned above. The number of images and the number of storage areas in the fourth to fifth embodiments are not limited to those described above. The images of the fourth to fifth embodiments may be subjected to code amount control within a predetermined group. Further, in the first to fifth embodiments, the second coded data part is the lower bit, but it may be any bit of data having low importance in image quality, for example, high band data of converted data. It may be a combination.

[0082]

As described above, according to the first and second aspects of the present invention, it is possible to arrange more important data in the predetermined storage area of the sync block than in the conventional case. When the image transmission device of the present invention is applied to a compression type digital VTR, deterioration of the fine portion during special reproduction can be significantly reduced. Further, when this image transmission device is used for ATM, it is possible to significantly reduce the deterioration of the minute portion when the packet is discarded.

According to the inventions of claims 3 to 7 of the present application, a part of the storage area of the coded data of the image that is easy to compress can be accommodated in the storage area of the coded data of the image that is difficult to compress. it can. Therefore, even an image that is difficult to compress can be recorded without causing significant deterioration.
Further, by using a memory having a fixed storage capacity, a fine image and a rough image are exchanged with each other in the storage area of the encoded data, so that more images than the assigned frame can be transmitted or recorded.

[Brief description of drawings]

FIG. 1 is a block diagram showing a general configuration of an image transmission device and an image recording device according to each embodiment of the present invention and a conventional example.

FIG. 2 is an explanatory diagram showing a method of arranging encoded data according to the first embodiment of the present invention.

FIG. 3A is a conventional arrangement method of encoded data,
(B) is an explanatory view specifically showing the arrangement method of the first embodiment.

FIG. 4 is a diagram showing an encoding code of encoded data used in each embodiment.

5 is an explanatory diagram showing an example of encoded data included in sync blocks A and B. FIG.

FIG. 6 is a diagram showing a decoded signal of encoded data obtained when a digital VTR is specially reproduced.

FIG. 7 is an explanatory diagram showing a method of arranging encoded data according to the second embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an arrangement method of encoded data according to a third embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a method of arranging encoded data according to the fourth embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a method of arranging encoded data according to a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a method of arranging encoded data according to the sixth embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a method of arranging encoded data in a conventional example.

[Explanation of symbols]

 101 Blocking Circuit 102 DCT Circuit 103 Quantization Circuit 104 Encoding Packing Circuit 105 Transmitter 105 ′ Recorder 106 Transmission Line 106 ′ Recording Medium 107 Receiver 107 ′ Regenerator 108 Unpacking Decoding Circuit 109 Inverse Quantization Circuit 110 IDCT Circuit 111 Deblocking circuit

Claims (8)

[Claims] 1. High-efficiency coding means for inputting image data, performing high-efficiency coding, packing the obtained converted data in a sync block, which is a transmission unit, and obtaining compressed image data, and the high-efficiency coding. Transmitting means for transmitting the compressed image data output from the means to a transmission path, receiving means for receiving the compressed image data from the transmission path, and decoding the compressed image data from the receiving means to obtain the image data. An image transmission apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and a bit length of a code word to be the quantized transformed data, and a first bit for configuring upper bits And a second bit pattern portion forming the lower bits of the code word, variable length coding the quantized conversion data to generate coded data, and from a predetermined number of the blocks. Variable-length coding means for arranging the encoded data of the multi-block in a sync block corresponding to the multi-block and arranging the encoded data that does not fit in the corresponding sync block in another sync block. If the encoded data of the quantized transform data in the predetermined range of the encoded data of the multi-block does not fit in the sync block corresponding to the multi-block,
An image transmission device, characterized in that a predetermined lower bit of a bit pattern part is separated and placed in another sync block. 2. High efficiency coding means for inputting image data, performing high efficiency coding, packing the obtained converted data in a sync block which is a transmission unit, and obtaining compressed image data, and said high efficiency coding. Transmitting means for transmitting the compressed image data output from the means to a transmission path, receiving means for receiving the compressed image data from the transmission path, and decoding the compressed image data from the receiving means to obtain the image data. An image transmission apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, variable length coding of the quantized transformed data to generate encoded data, and a predetermined number of Variable length coding means for arranging encoded data of a multi-block composed of blocks in a sync block corresponding to the multi-block, and arranging bits of the encoded data that do not fit in the sync block in another sync block. The variable length coding means has a second quantization characteristic of which the code amount of the quantum conversion data is smaller than that of the first quantization characteristic when the corresponding sync block cannot be filled when the encoded data is transmitted. And quantize the resulting quantized transform data to variable length code and arrange in a sync block. The total number of bits of the coded data according to the first quantization characteristic and the bit of coded data according to the second quantization characteristic. As many bits as the number of bits corresponding to the difference from the total number, a part of the lower bits lost by the quantization of the second quantization characteristic is applied to the corresponding sync block or another system. Image transmission apparatus and performing packed to place the click block. 3. High-efficiency coding means for inputting image data, performing high-efficiency coding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data, and said high-efficiency coding. Transmitting means for transmitting the compressed image data output from the means to a transmission path; receiving means for reproducing the compressed image data from the transmission path; and a decoding means for decoding the compressed image data from the reproducing means to obtain the image data. An image transmission apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and a bit length of a code word to be the quantized transformed data, and a first bit for configuring upper bits And a second bit pattern portion that constitutes the lower bit of the code word, variable length code the quantized conversion data to generate coded data, and code the coded data respectively. Coded data that is placed in a storage area and that does not fit in the storage area has variable length coding means that is placed in another storage area, and an image obtained by coding with the high efficiency coding means When the quantization characteristic with which the code amount of the encoded data per sheet becomes the target code amount is the first quantization characteristic, the second quantization with which the first quantization characteristic provides a predetermined image quality When it is finer than the characteristic, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transformed data, and the variable length coding means obtains the quantized transformed data of the transform quantizing means. Variable length coding The obtained coded data is composed of a first coded data part consisting of a high-order bit part that provides an image quality equal to or higher than the second quantization characteristic, and a second coded part consisting of other low-order bits. A first quantization in which a code amount of coded data per image obtained by being arranged in the storage area separately from the coded data part and coded by the high efficiency coding means is approximately a target code amount When the characteristic is coarser than the second quantization characteristic that provides a predetermined image quality, the transform quantization unit performs quantization with the second quantization characteristic to obtain quantized transformed data, and the variable length The coded data obtained by the coding means by variable-length coding the quantized transform data of the transform quantization means obtains the image quality with the total number of bits equal to the target code amount and close to the first quantization characteristic. Code consisting of high-order bit part The first coded data part is divided into a data part and a second coded data part consisting of other low-order bits, and the first coded data part is arranged in a predetermined storage area determined for each image, and the second coded data part is arranged. The encoded data section is overwritten and arranged in the empty area of the storage area or the empty area of another already-stored storage area and the area in which the second encoded data section is arranged, and the compressed data arranged here is arranged. An image transmission device characterized by transmitting image data. 4. High-efficiency coding means for inputting image data, performing high-efficiency coding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data, and said high-efficiency coding. Recording means for recording the compressed image data output by the means on a recording medium; reproducing means for reproducing the compressed image data from the recording medium; and a decoding means for decoding the compressed image data from the reproducing means to obtain the image data. An image recording apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and determining the bit length of the code word to be the quantized transformed data to configure the upper bits The coded data is divided into a first bit pattern part and a second bit pattern part forming lower bits of the code word, and the quantized conversion data is variable-length coded to generate coded data. In the storage area, and the encoded data that does not fit in the storage area has a variable length coding means that is arranged in another storage area. When the quantization characteristic in which the code amount of the encoded data per one image to be obtained becomes the target code amount is the first quantization characteristic, the first quantization characteristic can obtain the second image quality with a predetermined image quality. If it is finer than the quantization characteristic, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transform data, and the variable length coding means quantizes transform of the transform quantization means. Variable length code for data The coded data obtained by the above is used as a first coded data part consisting of a high-order bit part which gives an image quality equal to or higher than the second quantization characteristic, and a first coded data part consisting of the other low-order bits. The first coded data unit is arranged in the storage area separately from the second coded data unit, and the coded amount of coded data per image obtained by the coding by the high efficiency coding unit is substantially the target code amount. When the quantization characteristic is coarser than the second quantization characteristic that gives a predetermined image quality, the transform quantization unit performs quantization with the second quantization characteristic to obtain quantized transform data, and Variable-length coding means performs variable-length coding on the quantized transform data of the transform-quantizing means, and coded data obtained by variable-length coding is the total number of bits equal to the target code amount and the image quality is close to the first quantization characteristic. The first bit consisting of the high-order bit part of The first coded data part is divided into a coded data part and a second coded data part consisting of other low-order bits, and the first coded data part is arranged in a predetermined storage area determined for each image. It is characterized in that the second coded data part is overwritten and arranged in a vacant area of the storage area or a vacant area of another already arranged storage area, and an area in which the second coded data part is arranged. Image recording device. 5. High-efficiency coding means for inputting image data, performing high-efficiency coding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data, and said high-efficiency coding. Transmitting means for transmitting the compressed image data output from the means to a transmission path; reproducing means for reproducing the compressed image data from the transmission path; and a decoding means for decoding the compressed image data from the reproducing means to obtain the image data. An image transmission apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and a bit length of a code word to be the quantized transformed data, and a first bit for configuring upper bits And a second bit pattern portion forming the lower bit of the code word, variable length coding the quantized conversion data to generate coded data, and the coded data Coded data that is respectively placed in the storage area and that does not fit in the storage area has variable length coding means that is placed in another storage area, and is obtained by coding by the high efficiency coding means. When the first quantization characteristic in which the code amount of the encoded data per image is the target code amount is finer than the second quantization characteristic in which a predetermined image quality is obtained, the transform quantization unit is Quantization is performed by the first quantization characteristic to obtain quantized transform data, and the variable-length coding unit variable-length-codes the quantized transform data from the transform-quantizing unit. , The second The first coded data part consisting of the higher-order bit part and the second coded data part consisting of the other lower-order bits that can obtain an image quality equal to or higher than the sub-characteristics are separately arranged in the storage area. A second quantization with which the first quantization characteristic that the target code amount is the code amount of the encoded data per image obtained by encoding with the high-efficiency encoding means obtains a predetermined image quality. If the characteristics are rougher than the characteristics, the transform quantization means performs quantization with the first quantization characteristics to obtain quantized transform data, and the variable length coding means quantizes transform data from the transform quantization means. Is placed in a storage area determined for each image, and the total number of bits of the encoded data in the first quantization characteristic and the encoding of the second quantization characteristic are arranged. Equivalent to the total number of bits in the data The lower bit information below the decimal point of the quantized conversion data lost by the rounding process of quantization corresponding to the number of bits is the free space of the storage area, the free space of the storage area of another image that has been arranged, or the second code. An image transmission device, characterized in that the compressed image data is arranged by being overwritten in an area where the encoded data section is arranged, and the compressed image data arranged here is transmitted. 6. High-efficiency coding means for inputting image data, performing high-efficiency coding, packing the obtained converted data in a sync block, which is a recording unit, and obtaining compressed image data, and said high-efficiency coding. Recording means for recording the compressed image data output by the means on a recording medium; reproducing means for reproducing the compressed image data from the recording medium; and a decoding means for decoding the compressed image data from the reproducing means to obtain the image data. An image recording apparatus comprising: an efficiency coding / decoding means, wherein the high efficiency coding means divides the image data into blocks each consisting of a predetermined number of pixels, and orthogonally transforms the pixels of each block, Transform quantizing means for quantizing orthogonally transformed data to obtain quantized transformed data, and determining the bit length of the code word to be the quantized transformed data to configure the upper bits A first bit pattern portion and a second bit pattern portion forming the lower bits of the code word are divided, and the quantized conversion data is variable-length encoded to generate encoded data, and the encoding is performed. And a variable length coding means for arranging the data in each storage area, and the coded data that does not fit in the storage area is arranged in another storage area, and is encoded by the high efficiency coding means. When the first quantization characteristic with which the code amount of the obtained encoded data per image becomes the target code amount is finer than the second quantization characteristic with which a predetermined image quality is obtained, the transform quantization means Performs quantization with the first quantization characteristic to obtain quantized transformed data, and the variable length coding means performs variable length coding on the quantized transformed data from the transform quantizing means. The data is The first coded data part consisting of the higher-order bit part and the second coded data part consisting of the other lower-order bits that can obtain an image quality equal to or higher than the quantization characteristic of Then, the first quantization characteristic that the target code amount is the code amount of the encoded data per image obtained by encoding with the high-efficiency encoding means is the second quantum with which a predetermined image quality is obtained. When it is rougher than the quantization characteristic, the transform quantization means performs quantization with the first quantization characteristic to obtain quantized transform data, and the variable length coding means quantizes transform from the transform quantization means. Coded data obtained by variable-length coding the data is arranged in a storage area defined for each image, and the total number of bits of the coded data in the first quantization characteristic and the code of the second quantization characteristic are arranged. Difference with the total number of bits of the digitized data The number of bits to be used, the lower-order bit information below the decimal point of the quantized conversion data lost in the rounding process of quantization, the free space of the storage area, the free space of the storage area of another image that has been placed, or the second An image recording apparatus, characterized in that it is overwritten and arranged in an area in which an encoded data section is arranged. 7. When, after storing the coded data in the storage area for the standard number of recorded sheets, it is desired to add an image and arrange the coded data, an empty area in the storage area of each image or a second area The image transmission device according to claim 3 or 5, wherein the compressed image data arranged in the area where the encoded data portion is arranged is overwritten and arranged, and the compressed image data arranged here is transmitted. 8. When the encoded data is stored in the storage area for the standard number of recorded sheets and then an image is added and the encoded data is to be arranged, an empty area in the storage area of each image or a second area 7. An area in which the encoded data portion is arranged is overwritten and arranged.
The image recording apparatus described.