Video evaluation device, frame rate determination device, video process device, video evaluation method, and video evaluation program

Abstract

A frame rate is determined in accordance with the smoothness in movement of a video. An amount of change detection section extracts an amount of change based on a plurality of frame pictures included in an input video signal input as a moving picture signal from the outside and outputs an amount of change to an evaluation value calculation section. The evaluation value calculation section computes an amount of change in time between each of the frame pictures based on the amount of change and the time interval between frame pictures based on frame rate information and evaluates an evaluation value for evaluating the smoothness in movement of an input video based on the amount of change in time. The evaluation value is output to the outside as a factor for determining a frame rate.

1 . A video evaluation device comprising:
 an amount of change detection section configured to detect, based on a plurality of frame pictures included in an input video signal, an amount of change that indicates the degree of change between each of the frame pictures; and   an evaluation value calculation section configured to calculate an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between each of the frame pictures and outputting the evaluation value to the outside, wherein   the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a difference in luminance value between pixels located at the same coordinates in the successive frame pictures, and   the amount of change in time is computed based on the amount of change and a frame rate.   
     
     
         2 . A video evaluation device comprising:
 an amount of change detection section configured to detect, based on a plurality of frame pictures included in an input video signal, an amount of change that indicates the degree of change between each of the frame pictures; and   an evaluation value calculation section configured to calculate an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between each of the frame pictures and outputting the evaluation value to the outside wherein   the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a movement vector between the successive frame pictures, and   the amount of change in time is computed based on the amount of change and a frame rate.   
     
     
         3 . The video evaluation device according to  claim 1 , further comprising a feature value calculation section configured to calculate a movement feature value that indicates the feature of movement of the input video signal based on the amount of change, wherein the evaluation value calculation section calculates the evaluation value based on the movement feature value and the time interval between each of the frame pictures. 
     
     
         4 . The video evaluation device according to  claim 3 , wherein the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the movement feature value and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time. 
     
     
         5 . The video evaluation device according to  claim 3 , wherein:
 the amount of change is a movement vector between each of the frame pictures; and   the movement feature value is a value calculated based on the magnitude of the movement vector.   
     
     
         6 . A frame rate determination device comprising:
 a frame rate generation section configured to generate a first frame rate;   an amount of change detection section configured to detect, based on a plurality of frame pictures included in an input video signal, an amount of change that indicates the degree of change between each of the frame pictures;   an evaluation value calculation section configured to calculate an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between frame pictures in accordance with the first frame rate; and   a frame rate determination section configured to determine a second frame rate for carrying out the process of the input video signal using the evaluation value and outputting it to the outside, wherein   the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a difference in luminance value between pixels located at the same coordinates in the successive frame pictures, and   the amount of change in time is computed based on the amount of change and the first frame rate.   
     
     
         7 . The frame rate determination device according to  claim 6 , wherein the frame rate determination section compares the evaluation value with a predetermined set value and sets the second frame rate smaller than the first frame rate if the evaluation value is greater than the predetermined set value, and sets the second frame rate greater than the first frame rate when the evaluation value is smaller than the predetermined set value. 
     
     
         8 . A video process device comprising:
 a buffer section configured to store an input video signal;   a frame rate generation section configured to generate a first frame rate;   an amount of change detection section configured to detect, based on a plurality of frame pictures included in the input video signal, an amount of change that indicates the degree of change between each of the frame pictures;   an evaluation value calculation section configured to calculate an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between frame pictures in accordance with the first frame rate;   a frame rate determination section configured to determine a second frame rate for carrying out the process of the input video signal using the evaluation value; and   a video process section configured to read the input video signal stored in the buffer section using the second frame rate and carrying out the video process, wherein   the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a difference in luminance value between pixels located at the same coordinates in the successive frame pictures, and   the amount of change in time is computed based on the amount of change and the first frame rate.   
     
     
         9 . A video evaluation method comprising:
 an amount of change detection step for detecting, based on a plurality of frame pictures included in an input video signal, an amount of change that indicates the degree of change between each of the frame pictures; and.   an evaluation value calculation step for calculating an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between each of the frame pictures and outputting it to the outside, wherein   the evaluation value calculation step computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a difference in luminance value between pixels located at the same coordinates in the successive frame pictures, and   the amount of change in time is computed based on the amount of change and a frame rate.   
     
     
         10 . A non-transitory computer-readable medium including computer program instructions, which when executed by a computer, cause the computer to perform a video evaluation method comprising:
 detecting, based on a plurality of frame pictures included in an input video signal, an amount of change that indicates the degree of change between each of the frame pictures; and   calculating an evaluation value relating to the smoothness in movement of the input video signal based on the amount of change and the time interval between each of the frame pictures and outputting it to the outside, wherein   the step for calculating the evaluation value computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the amount of change and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time,   the amount of change is a value based on a movement vector between the successive frame pictures, and   the amount of change in time is computed based on the amount of change and a frame rate.   
     
     
         11 . The video evaluation device according to  claim 2 , further comprising a feature value calculation section configured to calculate a movement feature value that indicates the feature of movement of the input video signal based on the amount of change, wherein the evaluation value calculation section calculates the evaluation value based on the movement feature value and the time interval between each of the frame pictures. 
     
     
         12 . The video evaluation device according to  claim 11 , wherein the evaluation value calculation section computes an amount of change in time in accordance with the amount of change and the time interval between each of the frame pictures based on the movement feature value and the time interval between each of the frame pictures and calculates the evaluation value using the amount of change in time. 
     
     
         13 . The video evaluation device according to  claim 4 , wherein:
 the amount of change is a movement vector between each of the frame pictures; and   the movement feature value is a value calculated based on the magnitude of the movement vector.   
     
     
         14 . The video evaluation device according to  claim 11 , wherein:
 the amount of change is a movement vector between each of the frame pictures; and   the movement feature value is a value calculated based on the magnitude of the movement vector.   
     
     
         15 . The video evaluation device according to  claim 12 , wherein:
 the amount of change is a movement vector between each of the frame pictures; and   the movement feature value is a value calculated based on the magnitude of the movement vector.