JP2001211164A - Image encoding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable presentation to a user after performing ciphering to the extent that a human is able to recognize ciphered data without depending upon a ciphering system. SOLUTION: An encoding device 10 extracts an object included in an image by an object extraction part 11, performs a process for generating a ciphered object as an object of a ciphering process and an unciphered object which is not an object of the ciphering process, a process for varying pixel values of unciphered image data constituting the unciphered object and pixel values of ciphered image data constituting the ciphered object, and an encoding process for the unciphered object and a ciphering process for the ciphered object by an object ciphering and encoding part 13, and transmits the resulting data to a deciphering device side. The deciphering device side deciphers at least the unciphered image data and puts together the image data and ciphered image data with the pixel values set on the side of the encoding device 10 to reconstitute the objects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image encoding method for encoding and encrypting an object included in an image, decoding the encoded and encrypted object, and reconstructing the image.

[0002]

2. Description of the Related Art Conventionally, images such as photographs and paintings (work).
Were often distributed through media (publication) such as photo albums and albums with the permission of publishers to copy. For this reason, copying of a literary work such as an image requires a special printing machine or the like, and is not something that anyone can freely use.

[0003] However, at present, copyrighted works such as images have been handled as electronic data, and any person can easily copy and redistribute them. For example, once a copyrighted work becomes public on a communication line such as the Internet, the published work can be copied or appropriately tampered with by a third party, regardless of the creator's intentions, There was a risk of being redistributed over the line.

[0004] For this reason, it is desirable that an image creator or a copyright holder restricts a distribution destination by encrypting a copyrighted work in order to protect his / her copyright.

[0005] Here, when distributing images using various media or communication lines for the purpose of obtaining a browsing fee by allowing an unspecified number of images to be viewed, the images are encrypted and all of the images are processed. It is conceivable that the browsing of the image is restricted without browsing the image, and a decryption key (cryptographic decryption key) for legitimately browsing the image is issued only to the person who paid the browsing fee.

[0006] In the above-mentioned encryption processing, a single image is set as one object to be encrypted, and the main purpose is to secure the confidentiality of the image on a communication line. Therefore, as shown in FIG. 7, when an image is distributed by performing encryption processing in the encryption block 101, the encryption method and the length of the encryption key in the encryption block 101 are designated, and all image data are automatically transmitted. In general, encrypted image data is formed by performing an encryption process and transmitted to a data receiving destination. Such encryption processing,
It has been effective in ensuring the confidentiality of images and in that processing contents do not depend on attributes of input data such as images and music.

Conventionally, for example, MPEG-4 (Moving Pictu
re Experts Group 4) In the object-based encoding / decoding system that complies with the standard, the encoding and decoding processing processes not individual frames (images) but individual objects included in the images. Unit. In the encoding / decoding system, when each object overlaps in the image when displaying the decoded image, (1) one of the objects is displayed with priority (displayed on the front), and the other object is displayed. Avoid displaying the overlapped part. (2) Either of the display modes of appropriately mixing and displaying the image data of the overlapped objects is adopted.

Further, in the encoding / decoding system, the spatial position of each object can be determined by referring to the scene description information regardless of the display mode of (1) or (2). And a temporal position are recognized, and a display position in the image and a temporal display / non-display distinction are defined.

In such an encoding / decoding system,
By combining the decoded objects in accordance with the scene description information, the image before the encoding process is restored.

FIG. 8 shows an encoding apparatus constituting a conventional encoding / decoding system.

The object extraction unit 111 performs object extraction processing on the original image to divide it into a background image and two object images to form objects A to C.
Each of the objects A, B, and C is encoded by the encoding units 112A, 112B, and 112C. Each encoding unit 112A-
As an encoding method in 112C, for example, MPEG-1
Standards, a system conforming to the MPEG-2 standard and the like are used.
Further, the object extraction unit 111 outputs each object to the scene description unit 113, and the scene description unit 113 generates scene description information including display position information and display time information of each object, and sends the scene description information to the encoding unit 114. Output. The encoding unit 114 encodes the scene description information from the scene description unit 113. Then, the coded stream of each object and the coded stream of scene description information are multiplexed by the stream multiplexing unit 115 to be a multiplexed stream, which is transmitted to the decoding device side.

On the other hand, a decoding device for receiving and decoding a multiplexed stream coded by the coding device is configured as shown in FIG.

The multiplexed stream from the encoding device is input to a stream separation unit 121,
At 21 the multiplexing is decomposed to form individual coded streams. The stream separation unit 121 converts the encoded streams corresponding to the objects A to C into the decoding units 1
22A to 122C, and outputs an encoded stream corresponding to the scene description information to the decoding unit 123. Each of the decoding units 122A to 122C forms an image data by decoding the encoded stream, and
4 is output. Further, the decoding unit 123 forms scene description information by decoding the encoded stream and outputs the scene description information to the scene description unit 125. The scene description unit 125 interprets the scene description information formed in a predetermined language, forms display position information, display time information, and the like for each object, and outputs the information to the image synthesis unit 124. Image synthesis unit 12
In step 4, by combining the objects with reference to the display position information and the display time information from the scene description unit 125, the image before encoding is restored and presented to the user, for example.

[0014]

In the above-mentioned encoding / decoding system, when an object including an image is encrypted by the encoding device, the encrypted image cannot be recognized by human eyes. Often becomes. Therefore, in the conventional encoding / decoding system, when the encrypted data is transmitted to the user, it is possible to visually determine what the image data is unless the signal indicating the decryption key is obtained. Can not recognize. Further, it is impossible to provide a service in which a part of the image data is shown to arouse the user's desire to see and to bear the viewing cost.

Here, it is common practice to encrypt an image and to transmit the encrypted image data,
When an image is handled on the decoding device side, encryption is performed so that the outline of the image cannot be recognized. If the user cannot analogize the outline of the image, the above-described service cannot be provided.

On the other hand, conventionally, an encryption process for making the image recognizable to a certain degree by the user and a process for forming an encryption key of the image encrypted in a state where the image can be recognized have been performed. In such processing, it is necessary to adjust the encryption processing so that the image can be recognized. Therefore, if the degree of encryption processing is uniquely determined, the degree of encryption may be so strong that the user may not be able to recognize it. Therefore, in a conventional encoding / decoding system,
There is a possibility that a service of presenting a part of an image to a user to motivate a user to browse and promote browsing cannot be provided.

The present invention has been made in view of the above-described problems, and has been made in consideration of the above-described problems. The purpose is to provide.

[0018]

According to a first aspect of the present invention, there is provided an image encoding system for extracting a plurality of objects from an image, comprising: Cryptographic encoding means for encrypting and outputting a predetermined object among the objects extracted by the extracting means; and cryptographic encoding processing by the cryptographic encoding means among the objects extracted by the object extracting means. Encoding means for encoding and outputting an object other than the encoded object, an object which has been subjected to the encryption encoding processing by the encryption encoding means, and an object which has been encoded by the encoding means and output by synthesis processing And a combining output unit that performs

According to a second aspect of the present invention, there is provided an image encoding method for solving the above-mentioned problem, wherein a desired object among the objects extracted by the object extracting means is encrypted. There is a dividing means for dividing into a part to be encrypted and a part not to be coded. Then, the cryptographic encoding unit performs cryptographic encoding processing on a portion to be cryptographically encoded among the object parts divided by the division unit, and outputs the encoded data. An encoding process is performed on a portion of the divided object which is not to be encoded and output.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image coding system according to the present invention will be described in detail with reference to the drawings.

The image encoding system according to the present invention can be applied to, for example, an encoding / decoding system 1 as shown in FIG.

The encoding / decoding system 1 according to the embodiment of the present invention comprises an encoding device 10 and a decoding device 20 connected via a transmission medium. Here, examples of the transmission medium include a wired network such as the Internet, and a wireless network such as a mobile communication network. This encoding /
The decoding system 1 transmits a multiplexed stream from the encoding device 10 to the decoding device 20 via a transmission medium, and provides an image or the like to a user who operates the decoding device 20.

In this embodiment, a case will be described in which an image as shown in FIG. 2 is transmitted from the encoding device 10 to the decoding device 20, for example. This image includes an object A representing a background, an object B represented by a triangular area, and an object C represented by a circular area. In addition, although omitted in the following description, encoding /
In the decoding system 1, sound data, character data, and the like attached to the image are also handled as one object.

As shown in FIG. 3, the encoding device 10 includes an object extraction unit 11 for extracting objects A to C from the image shown in FIG. 2, and object encoding units 12A and 12B for encoding objects A and B. Is provided. Also,
The encoding device 10 includes an object encryption encoding unit 13 that encrypts and encodes the object C, a division coefficient setting unit 14 that sets processing in the object encryption encoding unit 13,
An encryption key setting unit 15 is provided. Further, the encoding device 10
Includes a scene description generation unit 16 that generates scene description information for each of the objects A to C, and a scene description information encoding unit 17 that encodes the scene description information. Furthermore, the encoding device 10 includes an object encoding unit 12A,
12B, a stream multiplexing unit 18 for multiplexing the coded streams from the object encryption coding unit 13 and the scene description information coding unit 17.

The object extracting unit 11 receives image data representing an image as shown in FIG. The object extraction unit 11 performs an object extraction process on the image data to extract image data representing the object A, image data representing the object B, and image data representing the object C. This object extraction unit 11
The image data indicating the object A is output to the object encoding unit 12A, and the image data indicating the object B is output to the object encoding unit 12B.
Is output to the object encryption encoding unit 13.

The object encoding unit 12A performs an encoding process on the image data representing the object A from the object extraction unit 11 to generate an encoded stream S11, and transmits the encoded stream S11 to the stream multiplexing unit 18. Output.

The object encoding unit 12B performs an encoding process on the image data representing the object B from the object extracting unit 11 to generate an encoded stream S12, and transmits the encoded stream S12 to the stream multiplexing unit 18. Output.

Here, the object encoding unit 12A
And 12B employs, for example, an object-by-object coding method conforming to the MPEG-4 standard.
Further, as the encoding process, an encoding method based on the MPEG-1 standard or the MPEG-2 standard using movement in the spatial direction and the time axis direction may be adopted.

The division coefficient setting unit 14 is connected to the object encryption encoding unit 13 and the scene description generation unit 16.

The division coefficient setting unit 14 supplies the object encryption encoding unit 13 with division coefficient information for dividing the ratio of the pixel values of the image data of the object C input to the object encryption encoding unit 13. The division coefficient information generated by the division coefficient setting unit 14 includes, for example, a coefficient indicating the ratio of the pixel value of the object C in the object encryption encoding unit 13 and information designating the pixels constituting the region into which the pixel value is divided. including. Here, the pixels constituting the region into which the pixel values are divided are specified by, for example, a user who operates the encoding device 10.

In this embodiment, the division coefficient setting unit 14
Outputs to the object encryption encoding unit 13 division coefficient information designating that the object C is divided into two objects having different pixel values.

More specifically, the division coefficient setting unit 14 specifies a division coefficient f (α) for each pixel constituting the object C. The value of the division coefficient f (α) is, for example, “0”.
Are invalidated.

The division coefficient setting unit 14 outputs the same information as the division coefficient information output to the object encryption encoding unit 13 to the scene description generation unit 16.

The encryption key setting unit 15 is connected to the object encryption encoding unit 13 and
In step 3, an encryption key for performing the encryption process is set. The encryption key setting unit 15 outputs the set encryption key.
The encryption key set by the encryption key setting unit 15 is transmitted to the decryption device 20 by a method different from the multiplexed stream generated by the stream multiplexing unit 18 described later.

The object encryption encoding unit 13 performs an encoding process and an encryption process on the image data representing the object C from the object extracting unit 11, thereby generating an encoded stream S13a and an encrypted stream S13b, and Stream S13a and encrypted stream S
13b is output to the stream multiplexing unit 18.

As shown in FIG. 4, the object encryption encoding unit 13 includes an object division unit 31 to which image data representing the object C is input from the object extraction unit 11, and an encoding processing unit that generates an encoded stream S13a. 32, and an encryption processing unit 33 that generates an encrypted stream S13b.

The object division unit 31 receives division coefficient information from the division coefficient setting unit 14. The object division unit 31 performs an operation using the division coefficient information to generate two divided objects C1 and C2 having the same shape as the object C and different pixel values.

When the division coefficient f (α) is input from the division coefficient information, the object division section 31 generates a division object C1 by multiplying each designated pixel by the division coefficient f (α), and generates a divided object C1. Processing is performed to generate a divided object C2 in which each pixel other than the pixel multiplied by the coefficient f (α) is multiplied by the division coefficient (1−f (α)). As a result, the object dividing unit 31 outputs the divided object C1 composed of the pixel having the pixel value obtained by multiplying the object C by the division coefficient f (α) and the pixel value obtained by multiplying the object C by the division coefficient (1−f (α)). A divided object C2 composed of pixels is formed.

The object dividing section 31 outputs image data S21 representing the divided object C1 obtained by multiplying the divided coefficient f (α) to the encoding processing section 32, and outputs the divided coefficient (1-f (α)). Divided object C2 obtained by multiplying
Is output to the encryption processing unit 33.

The encoding processing section 32 outputs image data S2 representing the divided object C1 from the object dividing section 31.
1 to generate an encoded stream S13a and output it to the stream multiplexing unit 18.

The encryption processing section 33 outputs the image data S22 indicating the divided object C2 from the object dividing section 31.
At the same time, an encryption key is input from the encryption key setting unit 15. The encryption processing unit 33 performs an encryption process on the image data S22 using the encryption key to perform an encryption stream S13.
b is generated and output to the stream multiplexing unit 18. It should be noted that the encryption processing unit 33 may use any encryption method.

The scene description generating section 16 receives image data indicating the objects A to C from the object extracting section 11 and obtains scene description information for reconstructing an image using the objects A to C on the decoding device 20 side. Generate

The scene description generation unit 16 generates display position information indicating the display positions of the objects A to C in the image,
Display time information indicating a position on the time axis at which each of the objects A to C is displayed in the image is generated as scene description information.

The scene description generating section 16 generates synthesis processing information describing a method of synthesizing each of the objects A to C as scene description information. Examples of the combining method include a method of displaying one of the objects as the front and combining the objects so as to hide the object on the back, and a method of combining the image data of both objects to combine. More specifically, the scene description generation unit 16 performs a synthesis method in which the object A indicating the background
A synthesis method when B overlaps with time is defined.

Further, the scene description generation unit 16 receives the division coefficient information for the object C,
The display time information, the display position information, and the synthesis processing information of each of the divided objects C1 and C2 are the same. This is because the divided objects C1 and C2 have different pixel values of the single object C, and have the same attributes in terms of time and space.

The scene description generator 16 describes scene description information including display position information, display time information, synthesis processing information, and division coefficient information in a predetermined language, and outputs it to the scene description information encoder 17.

The scene description information encoding unit 17 performs an encoding process on the scene description information from the scene description generation unit 16 to generate an encoded stream S14.
14 is output to the stream multiplexing unit 18.

The stream multiplexing section 18 includes a coded stream S11 indicating the object A from the object coding section 12A, a coded stream S12 indicating the object B from the object coding section 12B, and a coded stream S12 from the object encryption coding section 13. Encoded stream S13a indicating object C1, object encryption encoding unit 13
Stream S13 showing the object C2 from
b, multiplex the coded stream S14 indicating the scene description information from the scene description information coding unit 17 to generate a multiplexed stream. The stream multiplexing unit 18 transmits the generated multiplexed stream to the decoding device 20.

As shown in FIG. 5, the decoding device 20 includes a stream separation unit 21 to which a multiplexed stream is transmitted from the encoding device 10, and object decoding units 22A and 22B for decoding objects A and B. In addition, the decryption device 20 includes an object decryption unit 23 that decrypts the object C, an object encryption decryption unit 24 that decrypts the object C, and an encryption key acquisition unit 25 that acquires a decryption key. Further, the decoding device 20 includes a scene description information decoding unit 26 that decodes the scene description information,
A scene description interpreting unit 27 for interpreting scene description information is provided. Furthermore, the decryption device 20 includes an object decryption unit 22A, 22B, an object decryption unit 23, an object encryption decryption unit 24, and a scene description information decryption unit 2.
And a synthesizing unit 28 that performs synthesizing processing using the image data and scene description information from the image processing unit 6.

[0050] The stream separation unit 21
By decomposing the multiplexed stream from, the coded stream indicating the object A, the coded stream indicating the object B, the coded stream indicating the divided object C1, the encrypted stream indicating the divided object C2, and the scene description information are indicated. Obtain the encoded stream.

The stream separation unit 21 outputs an encoded stream S11 indicating the object A to the object decoding unit 22A, and outputs an encoded stream S12 indicating the object B to the object decoding unit 22B.
Encoded stream S13a indicating divided object C1
Is output to the object decryption unit 23, the encrypted stream S13b indicating the divided object C2 is output to the object encryption decryption unit 24, and the encoded stream S14 indicating the scene description information is output to the scene description information decoding unit 26. .

The object decoding unit 22A decodes the coded stream S11 from the stream separation unit 21,
The image data representing the background object A is restored. The object decoding unit 22 outputs the restored image data to the synthesis processing unit 28.

The object decoding unit 22B decodes the coded stream S12 from the stream separation unit 21,
The image data representing the object B is restored. The object decoding unit 22 outputs the restored image data to the synthesis processing unit 28.

The object decoding section 23 decodes the coded stream S12 from the stream separation section 21 and restores image data representing the divided object C1. The object decoding unit 23 outputs the restored image data to the combination processing unit 28.

The encryption key acquisition unit 25 uses the encryption key setting unit 15 of the encoding device 10 by a method different from the multiplexed stream.
Obtain the decryption key generated in. The encryption key acquisition unit 25 interprets the decryption key from the encoding device 10 and outputs the decryption key to the object encryption decryption unit 24. As a method of obtaining the decryption key by the encryption key obtaining unit 25, for example, the user
The decryption key may be distributed from the encryption key setting unit 15 to the encryption key acquisition unit 25 in response to the request for browsing the image including “!”.

The object encryption / decryption unit 24 receives the encrypted stream S13b from the stream separation unit 21 and the decryption key from the encryption key acquisition unit 25. This object encryption / decryption unit 24
Using the decryption key, the encrypted stream is decrypted and decrypted, and the image data representing the divided object C2 is restored. The object encryption / decryption unit 24 outputs the restored image data to the combination processing unit 28.

The object encryption / decryption unit 24
The encryption key forming unit 25 has not obtained the decryption key,
When there is no input of the decryption key, the encrypted image data is output to the synthesis processing unit 28 without performing the encryption process.

The scene description information decoding section 26 decodes the coded stream from the stream separation section 21 and restores the scene description information and the synthesis processing information. The scene description information decoding unit 26 outputs the restored scene description information and the synthesis processing information to the scene description interpretation unit 27.

The scene description interpreting section 27 interprets the scene description information, the composition processing information, and the division coefficient information from the scene description information decoding section 26 and performs a process of converting the information into a format that can be processed by the composition processing section 28. This scene description interpreter 27
Outputs scene description information necessary for the scene description in the composition processing unit 28 to the composition processing unit 28.

The synthesizing unit 28 includes a scene description interpreting unit 27
, The image data indicating the object A from the object decoding unit 22A, the image data indicating the object B from the object decoding unit 22B, and the image data indicating the divided object C1 from the object decoding unit 23. Using the image data indicating the divided object C2 from the object encryption / decryption unit 24, the image is reconstructed by synthesizing the image before being encoded by the encoding device 10.

At this time, the synthesis processing unit 28 refers to the display position information of the scene description information, and
ＣC, and the display method when a plurality of objects overlap is recognized by referring to the synthesis processing information. As a result, the synthesis processing unit 28
As shown in (1), the object A in the background is arranged at the rearmost position, the objects B and C are arranged in front of the object A, and the objects A to C are combined. When the image is a moving image that changes with time, the synthesis processing unit 28 performs the synthesis processing with reference to the display time information for each frame.

Further, the synthesizing unit 28 synthesizes the divided objects by adding the pixel values of the divided objects C1 and C2 with reference to the division coefficient f (α) included in the division coefficient information. To display the object C.

In such a decryption device 20, as shown in FIG. 6, according to the decryption state of the object decryption unit 23 and the decryption state of the object encryption decryption unit 24, the synthesis processing unit 28 The display state of the image changes.

That is, in the decryption device 20, when both the decryption of the divided object C1 and the decryption of the divided object C2 are normally performed (O in FIG. 6), the object C is deleted without noise due to encryption. Can be synthesized and displayed. That is, the decoding device 20
This means that the decryption key has been normally obtained from the encoding device 10 and decrypted.

If the decryption of the divided object C1 is normally performed but the decryption of the divided object C2 is not normally performed (△ in FIG. 6), the division coefficient (1)
-F (α)) is synthesized and displayed in a state having noise of only the pixel value of the ratio of -f (α)). Here, the division coefficient f
The value of (α) is small and the encrypted divided object C2
When the ratio of the pixel values of the non-encrypted divided object C1 is larger than the ratio of the pixel values of the non-encrypted divided object C1, the ratio of the noise increases and the image cannot be perceived.

Further, when the decryption of the divided object C1 and the decryption of the divided object C2 are not normally performed (x in FIG. 6), the combining processing unit 28 outputs the image data from the object decrypting unit 23. The object C is displayed using only the object C. Here, the object C is displayed with a pixel value determined by the division coefficient f (α).

In the encoding / decoding system 1 configured as described above, the ratio of the pixel value of the object C is divided by the object encryption encoding unit 13 of the encoding device 10 based on the division coefficient f (α). By setting the object C to be composed of the non-encrypted image data (the divided object C1) and the encrypted image data (the divided object C2), the display quality of the image can be controlled in accordance with the decryption / non-decryption. it can. Therefore, in the encoding / decoding system 1, by adjusting the division coefficient f (α) and adjusting the ratio of the pixel value between the encrypted image data and the non-encrypted image data of each object, the human Perceptible encryption can be applied to each object.

Further, in the encoding / decoding system 1, a human-perceivable encryption is performed for each object by simply determining the ratio of the pixel value between the encrypted image data and the non-encrypted image data. And does not depend on the encryption method.

Therefore, according to the encoding / decoding system 1, the decryption key for encryption is transmitted to the decryption device 2
When it is not acquired on the 0 side, an object including noise due to encryption is displayed, and the user of the decryption device 20 can be provided with a service that urges the user to want to see and bears the browsing cost. it can.

Further, in the encoding / decoding system 1, each object can be an incomplete image that can be recognized by a human, and even if the image becomes public, it is copied and appropriately falsified. Inconveniences such as redistribution again via media or a communication line can be prevented. Thereby, the encoding / decoding system 1 can protect the copyright of the image or the right of the image creator.

In the encoding / decoding system 1, an example has been described in which only the object C included in an image is encrypted and transmitted to the decryption device 20, but other objects are also encrypted. May be. At this time, a different decryption key is used for decrypting each object.

[0072]

According to the image encoding method of the present invention, a predetermined object among a plurality of objects is subjected to a cryptographic encoding process, and the other objects are subjected to an encoding process. Since the object that has been subjected to the encryption processing and the object that has been subjected to the encryption processing are combined and output, a portion (object) that can be recognized by a human in one image to be composited,
An image in which an unrecognizable part is mixed can be provided. For this reason, it is possible to present a single image as a whole to a user with encryption sufficient for human recognition.

According to the image encoding method of the present invention, a portion to be encrypted can be selected from one object and subjected to encryption encoding processing. For this reason,
It is possible to encrypt not only the object unit but also the object part.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an encoding / decoding system according to an embodiment to which an image encoding method according to the present invention is applied.

FIG. 2 is a diagram illustrating an image to be encoded by an encoding device according to an embodiment to which an image encoding method according to the present invention is applied.

FIG. 3 is a block diagram illustrating a configuration of an encoding device according to an embodiment to which an image encoding method according to the present invention is applied.

FIG. 4 is a block diagram illustrating a configuration of an object encryption encoding unit included in an encoding device according to an embodiment to which an image encoding method according to the present invention has been applied.

FIG. 5 is a block diagram illustrating a configuration of a decoding device according to an embodiment to which the image encoding method according to the present invention is applied.

FIG. 6 is a diagram for explaining that a display state of an image in a combination processing unit changes according to a state of decryption by an object decryption unit and a state of decryption by an object encryption decryption unit.

FIG. 7 is a diagram illustrating a conventional encryption process.

FIG. 8 is a block diagram illustrating a configuration of an encoding device included in a conventional encoding / decoding system.

FIG. 9 is a block diagram illustrating a configuration of a decoding device included in a conventional encoding / decoding system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Encoding / decoding system, 10 ... Encoding device, 11
... Object extraction unit, 12A, 12B ... Object encoding unit, 13 ... Object encryption encoding unit, 14 ... Division coefficient setting unit, 15 ... Encryption key setting unit, 16 ... Scene description generation unit, 17 ... Scene description information encoding Unit, 20 decoding device, 21 stream separation unit, 22A, 22B object decoding unit, 23 object decoding unit, 2
4 ... Object encryption / decryption unit, 26 ... Scene description information decoding unit, 27 ... Scene description interpretation unit, 28 ... Synthesis processing unit, 31 ... Object division unit, 32 ... Encoding processing unit
33 ... Encryption processing unit

Claims (2)

[Claims] 1. An object extracting means for extracting a plurality of objects from an image, a cryptographic encoding means for performing a cryptographic encoding process on a predetermined object among the objects extracted by the object extracting means, and outputting the object; An encoding unit that encodes and outputs an object other than the object that has been subjected to the encryption encoding processing by the encryption encoding unit among the objects extracted by the extraction unit; and an encoding unit that performs the encryption encoding processing by the encryption encoding unit. And a combining output unit for combining and outputting the objects encoded by the encoding unit. 2. The apparatus according to claim 1, further comprising: a dividing unit configured to divide a desired object into a part to be encrypted and a part not to be encrypted from among the objects extracted by the object extracting unit. Encoding means for performing an encryption encoding process on a part to be encrypted and encoded among the object parts divided by the division means, and outputs the object. 2. The method according to claim 1, further comprising: performing a coding process on a portion of the portion that is not to be coded.
Image coding system as described.