Video descriptor generation device

A video descriptor generation method, comprising:

• extracting a feature from a video for each picture which is a frame or a field, and outputting an each-picture feature;
• calculating an inter-picture feature difference, which is a difference between features of pictures, from the each-picture features of the video as a difference feature, and calculating a difference feature information amount indicating an information amount that is necessary for describing the difference feature;
• calculating a feature to be added as an additional feature from the video;
• and
• generating a video descriptor including the additional feature and the difference feature upon volume of the difference feature information amount being smaller that a certain criterion,
• wherein in the calculation of the additional feature, the additional feature is calculated only when the volume of the difference feature information amount is smaller than the certain criterion.

A non-transitory computer readable medium having stored thereon a program for causing a computer to function as:

• an each-picture feature extraction unit that extracts a feature from a video for each picture which is a frame or a field, and outputs an each-picture feature;
• an inter-picture feature difference calculation unit that calculates an inter-picture feature difference, which is a difference between features of pictures, from the each-picture features as a difference feature, and calculates a difference feature information amount indicating an amount of information of the difference feature;
• an additional feature extraction unit that calculates a feature to be added as an additional feature from the video;
• and
• a feature combining unit that, if volume of the difference feature information amount is smaller than a certain criterion, constitutes a video descriptor by incorporating the additional feature in addition to the difference feature,
• wherein the additional feature extraction unit calculates the additional feature only when the volume of the difference feature information amount is smaller than the certain criterion.