US 6,151,360 A · Method for encoding video signal using statistical information

Abstract

A picture encoding method employed in a system for encoding video signals of a motion picture for storage on a picture recording medium or in a system employed for transmitting video signals of a moving picture over a transmission channel. The encoding method includes a first step of generating the information on picture characteristics at least including the luminance information of the input video signals in terms of a pre-set time interval as a unit, a second step of calculating the information on the amount of generated bits of the information on picture characteristics in terms of a pre-set time interval as a unit, a third step of determining an encoding bit rate, based upon the information on picture characteristics, the information on the amount of the generated bits and the information on the total amount of data usable during transmission of encoded data, in terms of the pre-set time interval as a unit, and a fourth step of encoding the input video signals in accordance with the encoding bit rate in terms of the pre-set time as a unit for generating the encoded data.

Claims8

Dependent claims

A method for encoding picture data from input video signals comprising the steps of:

generating picture characteristics information including an average value of luminance signals and at least one of chromaticity of the picture, flatness of the picture and movement of the picture;
estimating an initial bit rate for an encoded picture over a predetermined time interval;
calculating an encoding difficulty from said picture characteristics information and the estimated initial bit rate such that said encoding difficulty is representative of the encoding noise, red color distortion, and picture deterioration from fast image movements which results from encoding;
determining an adjusted encoding bit rate on the basis of said encoding difficulty and constrained by a predetermined total amount of encoded data;
and
encoding said picture data in accordance with said adjusted encoding bit rate.

3 more elements

An apparatus for encoding picture data picture data from input video signals, comprising:

means for generating picture characteristics information including an average value of luminance signals and at least one of chromaticity of the picture, flatness of the picture and movement of the picture;
means for estimating an initial bit rate for an encoded picture over a predetermined time interval;
means for calculating an encoding difficulty from said picture characteristics information and the estimated initial bit rate such that said encoding difficulty is representative of the encoding noise, red color distortion, and picture deterioration from fast image movements which results from encoding;
means for determining an adjusted encoding bit rate on the basis of said encoding difficulty and constrained by a predetermined total amount of encoded data;
and
means for encoding said picture data in accordance with said adjusted encoding bit rate.

3 more elements

Dependencies are inferred from the claim text.

Method for encoding video signal using statistical information

Life of this patent

Method for encoding video signal using statistical information

Life of this patent

Abstract

Claims8