| 摘要 |
A method and interactive system for the on-line transmission of a high-resolution video sequence composed of a succession of T images includes a step of selecting relevant images comprising at least the following steps: split each image to be transmitted at the instant t into a number N of zones, for each zone n determined in the previous step, calculate a value representative of the content of said zone, for each image to be transmitted, generate a vector representative of the content of said image containing the values obtained in the previous step, calculate a normalized coefficient of correlation α between the reference vector determined for a previously selected image and that calculated for the current image, make a decision on the selection (or not) of the current image as a function of the value of the normalized correlation coefficient α. |
| 主权项 |
1. A method for on-line transmission of a high-resolution video sequence comprising T images, where T is the total number of images of the high-resolution video sequence, the method comprising, for each image I(t) of said video sequence, determining whether to select said image I(t) for transmission by:
splitting each image I(t) to be transmitted at an instant t into N zones, where N is the total number of image zones in each image I(t); calculating, for each zone n of the N zones, a value νn(t) representative of content of said zone; generating, for each image I(t) to be transmitted, a vector Vn(t) of size N representative of content of said image and containing the values νn(t) for each of the N zones, wherein VN(t)=[ν0(t), . . . , νN-1(t)]T, [·]T is a transposition operator for a vector; calculating a normalized coefficient of correlation α between a reference vector RN(k)=VN(t1)=[r0(k), . . . , rN-1(k)]T determined for an image previously selected for transmission at a previous instant t1 Isel(k−1)=I(t1) and the vector VN(t) calculated for the image I(t) according toα=RNT(k-1)·VN(t)RNT(k-1)·RN(k-1)·VNT(t)·VN(t),where k is a temporal index of a selected image;
determining whether to transmit the image I(t) by comparing the value of the normalized coefficient of correlation α with one or more thresholds having predetermined values; and replacing, if the image I(t) is transmitted, said image previously selected for transmission at a previous instant t1 Isel(k−1)=I(t1) by said image I(t). |
