Device and method for adaptive quantization based on video capturing mode

Patent metadata

Field	Value
Publication number	US-12413730-B2
Application number	US-202418608549-A
Country	US
Kind code	B2
Filing date	Mar 18, 2024
Priority date	Sep 26, 2018
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

Provided are an image processing device capable of performing compression processing on a video captured in each video capturing mode according to a first video capturing mode and a second video capturing mode with different capturing conditions. A possible range of a quantization parameter applied in a case where the video is compressed is made different in the first video capturing mode and the second video capturing mode with different capturing conditions. The quantization parameter is determined within a first range in a case of the first video capturing mode, and the quantization parameter is determined within a second range narrower than the first range in a case of the second video capturing mode. In particular, a second upper limit value of the second range is smaller than a first upper limit value of the first range, and a second lower limit value of the second range is larger than a first lower limit value of the first range.

First claim

What is claimed is:

1. An image processing device comprising
a processor configured to:
acquire a video captured based on a first video capturing mode or a second video capturing mode with an imaging condition that is different from an imaging condition of the first video capturing mode;
determine a quantization parameter of image data of a frame of the video; and
compress the image data with the quantization parameter,
wherein the processor is further configured to
determine the quantization parameter within a first range in a case of the first video capturing mode and determine the quantization parameter within a second range in a case of the second video capturing mode, and
a second upper limit value of the second range is smaller than a first upper limit value of the first range, wherein
the imaging condition includes at least one of a shutter speed, a speed of autofocus, a tracking speed of automatic exposure, a tracking speed of white balance and a frame rate, and
at least one of the shutter speed, the speed of autofocus, the tracking speed of automatic exposure, the tracking speed of white balance and the frame rate of the second video capturing mode is set faster than that of the first video capturing mode.

2. The image processing device according to claim 1 ,
wherein the second range is set according to a setting value of a frame rate.

3. The image processing device according to claim 1 ,
wherein the second range is set according to an input from operation panel that receives an external instruction.

4. The image processing device according to claim 1 ,
wherein the processor is further configured to:
discriminate a scene of the video; and
set the second range according to the scene.

5. The image processing device according to claim 1 ,
wherein the processor is configured to compress the video by an MPEG encoding method.

6. The image processing device according to claim 1 ,
wherein the processor is configured to determine the quantization parameter according to an amount of generated code after quantization of image data of a past frame of the video.

7. The image processing device according to claim 1 ,
the second range is narrower than the first range.

8. An imaging device comprising:
the image processing device according to claim 1 ; and
an image sensor configured to capture the video based on the first video capturing mode or the second video capturing mode,
wherein the processor is configured to acquire the video captured by the image sensor.

9. An image processing method comprising:
acquiring a video captured based on a first video capturing mode or a second video capturing mode with an imaging condition that is different from an imaging condition of the first video capturing mode;
determining a quantization parameter of image data of a frame of the video; and
compressing the image data with the quantization parameter,
wherein the quantization parameter is determined within a first range in a case of the first video capturing mode and the quantization parameter is determined within a second range in a case of the second video capturing mode, and
a second upper limit value of the second range is smaller than a first upper limit value of the first range, wherein
the imaging condition includes at least one of a shutter speed, a speed of autofocus, a tracking speed of automatic exposure, a tracking speed of white balance and a frame rate, and
at least one of the shutter speed, the speed of autofocus, the tracking speed of automatic exposure, the tracking speed of white balance and the frame rate of the second video capturing mode is set faster than that of the first video capturing mode.

10. The image processing method according to claim 9 ,
wherein the second range is set according to a setting value of a frame rate.

11. The image processing method according to claim 9 ,
wherein the second range is set according to an input from an operation panel that receives an external instruction.

12. The image processing method according to claim 9 , further comprising:
discriminating a scene of the video; and
setting the second range according to the discriminated scene.

13. The image processing method according to claim 9 ,
wherein the video is compressed by an MPEG encoding method.

14. The image processing method according to claim 9 ,
wherein the quantization parameter is determined according to an amount of generated code after quantization of image data of a past frame of the video.

15. A non-transitory computer readable medium for storing an image processing program causing a computer to perform a method, the method comprising:
acquiring a video captured based on a first video capturing mode or a second video capturing mode with an imaging condition that is different from an imaging condition of the first video capturing mode;
determining a quantization parameter of image data of a frame of the video; and
compressing the image data with the quantization parameter,
wherein, the quantization parameter is determined within a first range in a case of the first video capturing mode and the quantization parameter is determined within a second range in a case of the second video capturing mode, and
a second upper limit value of the second range is smaller than a first upper limit value of the first range,
wherein the imaging condition includes at least one of a shutter speed, a speed of autofocus, a tracking speed of automatic exposure, a tracking speed of white balance and a frame rate, and
at least one of the shutter speed, the speed of autofocus, the tracking speed of automatic exposure, the tracking speed of white balance and the frame rate of the second video capturing mode is set faster than that of the first video capturing mode.

Assignees

• Fujifilm Corp

Inventors

• Nishiyama Yukinori
• Wada Tetsu
• Tanaka Koichi
• Fujikawa Tetsuya
• Hayashi Kenkichi

Classifications

• H04N23/73

  by influencing the exposure time · CPC title

• H04N5/783

  Adaptations for reproducing at a rate different from the recording rate · CPC title

• H04N5/772

  the recording apparatus and the television camera being placed in the same enclosure · CPC title

• H04N19/172

  the region being a picture, frame or field · CPC title

• H04N23/667

  Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes · CPC title