Image transmission system with finite retransmission and method thereof

A transmission method applied in an image transmission system having a communication channel, a transmitting device and a receiving device, wherein the transmitting device comprises a first coded buffer and the receiving device comprises a second coded buffer and a decoded buffer, the method comprising:

• determining whether to encode a source pixel line with a first line ID into a first encoded stream, store the first encoded stream in the first code buffer, transform the first encoded bit stream into data packets and transmit the data packets over the communication channel according to a first state signal;
• determining whether to send an acknowledgement in response to one data packet from the communication channel, transform the data packet into a second encoded bit stream and store the second encoded bit stream in the second coded buffer according to a second state signal and whether the data packet is received correctly;
• determining whether to decode the second encoded bit stream into a decoded pixel line according to the second state signal;
• determining whether to update a decoded ID list, output a control information and store the decoded pixel line in the decoded buffer according to a second line ID of the decoded pixel line, a display information and whether the second encoded bit stream is decoded successfully;
• and
• outputting the display information and transferring a corresponding decoded pixel line for display according to the control information;
• wherein the first state signal and the second state signal are generated by the first coded buffer and the second coded buffer;
• and
• wherein the first state signal and the second state signal respectively indicate a first buffer fullness relative to a capacity of the first coded buffer and a second buffer fullness relative to a capacity of the second coded buffer.

A receiving device, comprising:

• a receiver for receiving a data packet and determining whether to send an acknowledgement and transform the data packet into an encoded bit stream according to both a state signal and whether the data packet is received correctly;
• a coded buffer for storing the encoded bit stream and generating the state signal;
• a decoded buffer;
• a decoder for determining whether to decode the encoded bit stream into a decoded pixel line according to the state signal and determining whether to update a decoded ID list, output a control information and store the decoded pixel line in the decoded buffer according to a first line ID of the decoded pixel line, a display information and whether the encoded bit stream is decoded successfully;
• and
• a display control unit for outputting the display information and transferring a corresponding decoded pixel line for display according to the control information;
• wherein the state signal indicates a buffer fullness relative to a capacity of the coded buffer.

A transmitting device, comprising:

• an encoder for determining whether to encode a source pixel line with a corresponding line ID into an encoded bit stream according to a state signal;
• a coded buffer for storing the encoded bit stream and generating the state signal;
• and
• a transmitter for transforming the encoded bit stream into data packets and transmitting the data packets over a communication channel;
• wherein the state signal indicates a buffer fullness relative to a capacity of the coded buffer.