Method and apparatus for image transmission
AssigneeCanon Kabushiki Kaisha
InventorsSadasuke Kurahayashi, Tsunehiro Watanabe, Masahiro Sakamoto, Yasuhide Ueno, Takeshi Ono, Shigeo Miura, Tsuneo Negi, Masatomo Takahashi
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Abstract
An image transmission method includes the steps of: obtaining an image signal by reading an original image; compression-encoding the obtained image signal; temporarily storing the encoded image data into a temporary storage memory; presuming the empty capacity of a buffer memory for temporarily storing the received image data at a receiving side; and transmitting the encoded image data in accordance with the presumed empty capacity.
Claims17
An image transmission method comprising the steps of:
- obtaining an image signal by reading an original image;
- compression-encoding the obtained image signal;
- temporarily storing the encoded image data in a temporary storage memory;
- receiving, prior to transmission of the encoded data, process time data of a receiving side and a capacity of a buffer memory for temporarily storing the received image data at the receiving side;
- presuming an amount of empty capacity of the buffer memory at the receiving side based on the process time and the capacity of the buffer memory;
- and
- transmitting the encoded image data in accordance with the presumed empty capacity.
An image transmission apparatus comprising:
- reading means for reading an original image to convert the original image into an image signal;
- encoding means for compression-encoding the converted image signal to obtain encoded data;
- storage means for temporarily storing the encoded data;
- transmission means for transmitting the encoded date in said storage means;
- receiving means for receiving, prior to transmission of the encoded data, process time data of a receiving side and storage capacity information of a buffer memory at the receiving side;
- detection means for detecting the amount of data already transmitted by said transmission means but still not processed at the receiving side by presuming the amount of the encoded data processed at the receiving side based on the process time and the storage capacity;
- and
- control means for controlling said apparatus in such a way that the amount of data still not processed does not exceed the memory capacity of the buffer memory at the receiving side.
An image transmission method comprising the steps of:
- obtaining an image signal by reading an original image;
- compression-encoding the obtained image signal;
- transmitting the encoded image data;
- and
- outputting a command signal after said transmission of the encoded image data by one page and prior to completion of the recording process of the encoded image data at a receiving side, the command signal instructing to change the reception mode of the receiving side from an image receiving mode to a control signal receiving mode.
An image transmission method comprising the steps of:
- establishing a line to a receiving side;
- obtaining an image signal by reading an original image;
- compression-encoding the image signal;
- temporarily storing the encoded image data in a buffer memory;
- and
- transmitting the encoded image data from the buffer memory;
- wherein said encoding and storing steps start after establishing the line and prior to completion of pre-procedure at the receiving side.
An image transmission apparatus comprising:
- establishing means for establishing a line to a receiving side;
- reading means for reading an original image to convert the original image into an image signal;
- encoding means for compression-encoding the image signal;
- storage means for temporarily storing the image signal encoded by said encoding means;
- tranmission means for transmitting the encoded image signal in said storage means and transmitting prior to transmitting the encoded image signal a set signal for setting the receiving side at a reception state;
- receiving means for receiving, prior to transmission of the encoded image data, a control signal representative of a completion of pre-procedure at the receiving side;
- and
- control means for starting the operations by said encoding means and said storage means after establishing said line and prior to a reception of the control signal.
Dependencies are inferred from the claim text.