Image transmitter

• US 20060209335A1
• Filed: 11/07/2005
• Published: 09/21/2006
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Sasaki, Shin
• Granted Patent: US 7,561,746 B2
• Time in Patent Office: Days
• US Class Current: 358/1.150
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/188 the unit being a video data packet, e.g. a network abstraction layer [NAL] unit
• CPC Class Codes: H04N 21/23611 Insertion of stuffing data into a multiplex stream, e.g. to obtain a constant bitrate synchronisation arrangements in time-division multiplex systems using bit stuffing for systems with different or fluctuating information rates H04J3/073

Abstract

An image transmitter has: an encoder for receiving image data and outputting coded image data; a packet transmitter for receiving the coded image data from the encoder, buffering the coded image data while counting a data number, and when coded image data of one packet of a fixed length is buffered, packetizing the coded image data and transmitting the packetized coded image data; a first enable signal generator for generating a first enable signal which becomes enable at a start of transmission of each packet and disable at an end of transmission; and a second enable signal generator for generating a second enable signal which becomes enable at a start of transmission of a predetermined number of packets and disable at an end of transmission. The image transmitter and image transmitting method are provided which can transmit image data to an application chip fabricated on the assumption that it receives a packet of a fixed data number and a frame of a fixed packet number.

Claims

1. An image transmitter comprising:

an encoder for receiving image data and outputting coded image data;

a packet transmitter for receiving the coded image data from said encoder, buffering the coded image data while counting a data number, and whcoded image data of one packet corresponding to a fixed data number is buffered, packetizing the coded image data and transmitting the packetized coded image data;

a first enable signal generator for generating a first enable signal which becomes enable at a start of transmission of each packet and disable at an end of transmission; and

a second enable signal generator for generating a second enable signal which becomes enable at a start of transmission of packets of a fixed packet number and disable at an end of transmission.

2. The image transmitter according to claim 1, wherein said second enable signal generator receives and counts said first enable signal to generate said second enable signal.

3. The image transmitter according to claim 1, further comprising a dummy data adder for adding dummy data, in a state that said encoder outputs coded image data of one frame to said packet transmitter and the number of data in a last packet is smaller than the fixed data number, to the data in the last packet.

4. The image transmitter according to claim 1, wherein said encoder outputs information including an encoding end and a coded data number of a frame after said encoder encodes image data of a frame.

5. The image transmitter according to claim 4, further comprising a communication function unit for receiving said information from said encoder and transmitting frame data including the coded data number of the frame.

6. The image transmitter according to claim 2, further comprising a dummy data adder for adding dummy data, in a state that said encoder outputs coded image data of one frame to said packet transmitter and the number of data in a last packet is smaller than the fixed data number, to the data in the last packet.

7. The image transmitter according to claim 2, wherein said encoder outputs information including an encoding end and a coded data number of a frame after said encoder encodes image data of a frame.

8. The image transmitter according to claim 7, further comprising a communication function unit for receiving said information from said encoder and transmitting frame data including the coded data number of the frame.

9. The image transmitter according to claim 3, wherein said encoder outputs information including an encoding end and a coded data number of a frame after said encoder encodes image data of a frame.

10. The image transmitter according to claim 9, further comprising a communication function unit for receiving said information from said encoder and transmitting frame data including the coded data number of the frame.

11. An image transmitting method comprising:

an encoding step of receiving image data and outputting coded image data;

a packet transmitting step of receiving the coded image data, buffering the coded image data while counting a data number, and when coded image data of one packet corresponding to a fixed data number is buffered, packetizing the coded image data and transmitting the packetized coded image data;

a first enable signal generating step of generating a first enable signal which becomes enable at a start of transmission of each packet and disable at an end of transmission; and

a second enable signal generating step of generating a second enable signal which becomes enable at a start of transmission of packets of a fixed packet number and disable at an end of transmission.

12. The image transmitting method according to claim 11, wherein said second enable signal generating step receives and counts said first enable signal to generate said second enable signal.

13. The image transmitting method according to claim 11, further comprising a dummy data adding step of adding dummy data, in a state that said encoding step outputs coded image data of one frame and the number of data in a last packet is smaller than the fixed data number, to the data in the last packet.

14. The image transmitting method according to claim 11, wherein said encoding step outputs information including an encoding end and a coded data number of a frame after said encoding step encodes image data of a frame.

15. The image transmitting method according to claim 14, further comprising a communication step of receiving said information and transmitting frame data including the coded data number of the frame.

16. The image transmitting method according to claim 12, further comprises a dummy data adding step of adding dummy data, in a state that said encoder outputs coded image data of one frame and the number of data in a last packet is smaller than the fixed data number, to the data in the last packet.

17. The image transmitting method according to claim 12, wherein said encoding step outputs information including an encoding end and a coded data number of a frame after said encoding encodes image data of a frame.

18. The image transmitting method according to claim 17, further comprising a communication step of receiving said information and transmitting frame data including the coded data number of the frame.

19. The image transmitting method according to claim 16, wherein said encoding step outputs information including an encoding end and a coded data number of a frame after said encoding step encodes image data of a frame.

20. The image transmitting method according to claim 19, further comprising a communication step of receiving said information and transmitting frame data including the coded data number of the frame.