Device and method for multimedia data transmission

摘要

A method to transmit images of a video sequence over a transmission channel between a transmitter and a receiver of a communication network, the image being composed of several image areas, the method for an image to be transmitted including: identifying image areas of a first type in the image; identifying image areas of a second type in the image; determining a transmission rate for transmission of the image to the receiver as a function of the number of first-type image areas compared with the number of second-type image areas; selecting a coding scheme for each image area as a function of area type; modifying the coding parameters as a function of the determined transmission rate; encoding the image areas by applying the selected coding scheme and the modified coding parameters; and transmitting the image areas at the determined transmission rate. Improved image quality is thus obtained.

主权项

1. A method to transmit images of a video sequence over a transmission channel between a transmitter and a receiver of a wireless communication network, each image being composed of a plurality of image areas, the method for an image to be transmitted, comprising:
identifying (S101) image areas of a first type in the image to be transmitted; identifying (S101) image areas of a second type in the image to be transmitted; determining a location (S211) of the receiver that is to receive data of the image to be transmitted; determining (S102) a transmission rate for transmission of the image to the receiver as a function of the number of image areas of the first type identified in the image compared with the number of image areas of the second type identified in the image, and further as a function of the determined location of the receiver; selecting (S103) a coding scheme for each image area as a function of area type; modifying (S104) coding parameters of the coding scheme as a function of the determined transmission rate; encoding the image areas (S105) by applying the selected coding scheme and modified coding parameters; and transmitting (S106) the image areas at the determined transmission rate.