Granted Patent B2

US 12,445,665 · App. 18/293,135 · Granted Oct 14, 2025

Inventors: Kimiko Kawashima (Tokyo, JP); Noritsugu Egi (Tokyo, JP)

Assignee: NTT, Inc.

H04N21/2402

Abstract

Claims (26)

1. A video quality estimation apparatus that estimates a video quality of a video having a screen layout in which parts are arranged, the video quality estimation apparatus comprising:

a processor; and

a memory storing program instructions that cause the processor to:

estimate a video quality of each of the parts forming the video; and

estimate the video quality of the video based on the estimated video quality of each of the parts and a layout resolution of each of the parts on the screen layout, said layout resolution being determined based on a relative size of each of the parts within a display,

wherein the program instructions cause the processor to:

calculate, for each of the parts, a video quality reflecting an influence of reduction in size of each of the parts to form the screen layout, said influence of reduction in size of each of the parts being defined by a degree of deterioration of the video quality, for each of the parts with different sizes, that is caused by reduction of bit rate; and

calculate the video quality of the video by reflecting an influence of integration of the plurality of parts forming the screen layout, said influence of the integration of the plurality of parts being defined by a degree of deterioration of the video quality that is caused by integrating video quality of each of the parts.

2. A video quality estimation apparatus that estimates a video quality of a video having a screen layout in which a plurality of parts are arranged, the video quality estimation apparatus comprising:

a processor; and

a memory storing program instructions that cause the processor to:

estimate a video quality of each of the parts based on encoding information and a part type of each of the parts forming the video, said part type being defined as a category of an object that is displayed as each of the parts; and

estimate the video quality of the video based on the estimated video quality of each of the parts and a layout resolution of each of the parts on the screen layout, said layout resolution being determined based on a relative size of each of the parts within a display,

wherein the program instructions cause the processor to:

calculate, for each of the parts, a video quality reflecting an influence of reduction in size of each of the parts to form the screen layout, said influence of reduction in size of each of the parts being defined by a degree of deterioration of the video quality, for each of the parts with different sizes, that is caused by reduction of bit rate; and

calculate the video quality of the video by reflecting an influence of integration of the plurality of parts forming the screen layout, said influence of the integration of the plurality of parts being defined by a degree of deterioration of the video quality that is caused by integrating video quality of each of the parts.

3. The video quality estimation apparatus according to claim 2 , wherein the program instructions cause the processor to estimate the video quality of each of the parts by using a video quality estimation model reflecting a coefficient corresponding to the part type, said coefficient being coefficient of the video quality estimation model used for estimating the video quality of each of the parts.

4. The video quality estimation apparatus according to claim 1 , wherein the program instructions cause the processor to calculate the video quality of each of the parts in consideration of the reduction in size by using a reduction effect coefficient that is set based on a relationship between an area ratio of each of the parts to a whole screen, a bit rate of each of the parts, and the video quality of each of the parts.

5. The video quality estimation apparatus according to claim 1 , wherein the program instructions cause the processor to calculate the video quality of the video by integrating the video quality of each of the parts in consideration of the reduction in size, while considering the area ratio of each of the parts to a whole screen.

6. A video quality estimation method executed by a video quality estimation apparatus that estimates a video quality of a video having a screen layout in which parts are arranged, the video quality estimation method comprising:

estimating the video quality of the video based on a video quality of each of the parts forming the video and a layout resolution of each of the parts on the screen layout, said layout resolution being determined based on a relative size of each of the parts within a display,

wherein the video quality estimation method further comprises:

calculating, for each of the parts, a video quality reflecting an influence of reduction in size of each of the parts to form the screen layout, said influence of reduction in size of each of the parts being defined by a degree of deterioration of the video quality, for each of the parts with different sizes, that is caused by reduction of bit rate; and

calculating the video quality of the video by reflecting an influence of integration of the plurality of parts forming the screen layout, said influence of the integration of the plurality of parts being defined by a degree of deterioration of the video quality that is caused by integrating video quality of each of the parts.

7. A non-transitory computer-readable recording medium storing a program for causing a computer to perform the video quality estimation method of claim 6 .

8. The video quality estimation apparatus according to claim 2 , wherein the layout resolution is a resolution of each of the parts that is obtained by adjusting an original resolution of each of the parts based on the relative size of each of the parts within the display.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (24)