IMAGE DECODING APPARATUS, IMAGE TRANSMISSION APPARATUS, IMAGE PROCESSING SYSTEM, IMAGE DECODING METHOD, AND IMAGE TRANSMISSION METHOD USING RANGE INFORMATION
An image decoding apparatus includes a request unit that requests an image transmission apparatus to transmit an image, a transmission unit that transmits range information indicating a range which is a partial range of the image and which is selected in accordance with a user operation to the image transmission apparatus, a receiving unit that, while the partial range of the image is selected, receives, from the image transmission apparatus, the entirety of the image when the image belongs to a first type and a portion of the image when the image belongs to a second type, by receiving one or more tiles, which corresponds to the partial range of the image and outside which a reference to is prohibited in inter-picture prediction, among a plurality of tiles included in the image, and a decoding unit that decodes the received entirety or portion of the image.
1 . An image decoding apparatus for receiving an encoded image from an image transmission apparatus and decoding the image received from the image transmission apparatus, comprising:
a requester requests the image transmission apparatus to transmit the image;
a transmitter transmits range information to the image transmission apparatus, the range information being range information indicating a range which is a partial range of the image within an entire range of the image;
a receiver that receives information indicating whether the image belongs to a first type or a second type (i) receives the entirety of the image from the image transmission apparatus when the image belongs to the first type, and (ii) receives a portion of the image from the image transmission apparatus when the image belongs to the second type, by receiving one or more tiles corresponding to the partial range of the image among a plurality of tiles included in the image, each of the one or more tiles being a tile outside which a reference to is prohibited in inter-picture prediction; and
a decoder decodes the entirety or portion of the image received from the image transmission apparatus.
2 . The image decoding apparatus according to claim 1 , further comprising:
a display controller displays the entirety or portion of the image decoded by the decoder on a first display device.
3 . The image decoding apparatus according to claim 2 , wherein
the range information is saved,
in a case where the receiver receives a portion of the image, the receiver receives a portion of the image in accordance with the saved range information,
in a case where the decoder decodes a portion of the image, the decoder decodes the portion of the image received in accordance with the saved range information, and
in a case where the display controller displays a portion of the image, the display controller displays the portion of the image received and decoded in accordance with the saved range information.
4 . The image decoding apparatus according to claim 3 , wherein
in a case where the display controller displays a portion of the image after displaying the entirety of another image, the display controller displays the portion of the image received and decoded in accordance with the saved range information.
5 . The image decoding apparatus according to claim 4 , wherein
in a case where the display controller further stops display of a portion of the image and then resumes the display of the portion of the image, the display controller displays the portion of the image received and decoded in accordance with the saved range information.
6 . The image decoding apparatus according to claim 5 , wherein
the display controller further displays the portion of the image received and decoded in accordance with the saved range information on a second display device different from the first display device.
7 . The image decoding apparatus according to claim 6 , wherein
in a case where the range information is not saved, the transmitter transmits the range information to the image transmission apparatus, and
in a case where the range information is saved and in a case where the receiver receives a portion of the image, the receiver receives a portion of the image in accordance with the saved range information without the range information being transmitted from the transmitter to the image transmission apparatus.
8 . The image decoding apparatus according to claim 7 , further comprising:
a selector selects a partial range of the image in accordance with the user operation, wherein
the transmitter transmits range information indicating the range selected by the selector to the image transmission apparatus.
9 . The image decoding apparatus according to claim 8 , wherein
while the partial range of the image is selected,
the receiver receives the entirety of the image when the image belongs to the first type, the first type being a type in which display of the entirety of the image is recommended, and
the receiver receives a portion of the image when the image belongs to the second type, the second type being a type in which display of the entirety of the image is not recommended.
10 . The image decoding apparatus according to claim 9 , wherein
while the partial range of the image is selected,
the receiver receives the entirety of the image when the image belongs to the first type, the first type being an advertisement, and
the receiver receives a portion of the image when the image belongs to the second type, the second type being different from an advertisement.
11 . The image decoding apparatus according to claim 10 , wherein
the information is a flag indicating whether the image belongs to the first type or the second type, and
the receiver receives the entirety or portion of the image in accordance with the flag.
12 . An image transmission apparatus for transmitting an encoded image to an image decoding apparatus, comprising:
a request accepter accepts a request from the image decoding apparatus to transmit the image; a receiver receives range information from the image decoding apparatus, the range information being range information indicating a range which is a partial range of the image within an entire range of the image and which is selected in accordance with a user operation;
a determiner determines whether the image belongs to a first type or a second type; and
a transmitter that (i) transmits the entirety of the image to the image decoding apparatus when the image belongs to the first type, and (ii) transmits a portion of the image to the image decoding apparatus when the image belongs to the second type, by transmitting one or more tiles corresponding to the partial range of the image among a plurality of tiles included in the image, each of the one or more tiles being a tile outside which a reference to is prohibited in inter-picture prediction.
13 . The image transmission apparatus according to claim 12 , wherein
while the partial range of the image is selected,
the transmitter transmits the entirety of the image when the image belongs to the first type, the first type being a type in which display of the entirety of the image is recommended, and
the transmitter transmits a portion of the image when the image belongs to the second type, the second type being a type in which display of the entirety of the image is not recommended.
14 . The image transmission apparatus according to claim 13 , wherein
while the partial range of the image is selected,
the transmitter transmits the entirety of the image when the image belongs to the first type, the first type being a type indicating an advertisement, and
the transmitter transmits a portion of the image when the image belongs to the second type, the second type being a type indicating a different from an advertisement.
15 . The image transmission apparatus according to claim 14 , wherein
the image is assigned a flag indicating whether the image belongs to the first type or the second type, and
the transmitter transmits the entirety or portion of the image in accordance with the flag.
16 . An image processing system for processing an encoded image, comprising:
an image transmission apparatus; and
an image decoding apparatus,
the image transmission apparatus transmitting the image to the image decoding apparatus,
the image decoding apparatus receiving the image from the image transmission apparatus and decoding the image received from the image transmission apparatus,
the image decoding apparatus including
a requester requests the image transmission apparatus to transmit the image,
a first transmitter transmits range information to the image transmission apparatus, the range information being range information indicating a range which is a partial range of the image within an entire range of the image,
a first receiver that receives information indicating whether the image belongs to a first type or a second type, (i) receives the entirety of the image from the image transmission apparatus when the image belongs to the first type, and (ii) receives a portion of the image from the image transmission apparatus when the image belongs to the second type, by receiving one or more tiles corresponding to the partial range of the image among a plurality of tiles included in the image, each of the one or more tiles being a tile outside which a reference to is prohibited in inter-picture prediction, and
a decoder decodes the entirety or portion of the image received from the image transmission apparatus,
the image transmission apparatus including
a request accepter accepts a request from the image decoding apparatus to transmit the image,
a second receiver receives the range information from the image decoding apparatus,
a determiner determines the image belongs to the first type or the second type, and
a second transmitter that (i) transmits the entirety of the image to the image decoding apparatus when the image belongs to the first type, and (ii) transmits a portion of the image to the image decoding apparatus when the image belongs to the second type, by transmitting the one or more tiles among the plurality of tiles included in the image.
17 . An image decoding method for receiving an encoded image from an image transmission apparatus and decoding the image received from the image transmission apparatus, comprising:
requesting the image transmission apparatus to transmit the image;
transmitting range information to the image transmission apparatus, the range information being range information indicating a range which is a partial range of the image within an entire range of the image;
receiving information whether the image belongs to a first type or a second type, (i) receiving the entirety of the image from the image transmission apparatus when the image belongs to the first type, and (ii) receiving a portion of the image from the image transmission apparatus when the image belongs to the second type, by receiving one or more tiles corresponding to the partial range of the image among a plurality of tiles included in the image, each of the one or more tiles being a tile outside which a reference to is prohibited in inter-picture prediction; and
decoding the entirety or portion of the image received from the image transmission apparatus.
18 . An image transmission method for transmitting an encoded image to an image decoding apparatus, comprising:
accepting a request from the image decoding apparatus to transmit the image;
receiving range information from the image decoding apparatus, the range information being range information indicating a range which is a partial range of the image within an entire range of the image;
determining determines whether the image belongs to a first type or a second type; and
(i) transmitting the entirety of the image to the image decoding apparatus when the image belongs to the first type, and (ii) transmitting a portion of the image to the image decoding apparatus when the image belongs to the second type, by transmitting one or more tiles corresponding to the partial range of the image among a plurality of tiles included in the image, each of the one or more tiles being a tile outside which a reference to is prohibited in inter-picture prediction.