# US 2020/0404136 A1 · Video display system and video display method

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- Number: US 2020/0404136 A1
- Document ID: US20200404136A1
- Status: Published application
- Kind: A1
- Application number: 16/968,803
- Filed: 2019-01-30
- Published: 2020-12-24
- Earliest claimed: 2018-02-28
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Ryuji FUCHIKAMI
- Web page: https://patentgrep.com/patent/US20200404136A1

## CPC

- H04N 7/183: {for receiving images from a single remote source}
- H04N 23/60: Control of cameras or camera modules
- G09G 5/006: {Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04)}
- G09G 5/36: characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G 5/391: Resolution modifying circuits, e.g. variable screen formats
- G09G 5/397: Arrangements specially adapted for transferring the contents of two or more bit-mapped memories to the screen simultaneously, e.g. for mixing or overlay (G09G5/02 takes precedence)
- H04N 7/18: Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N 23/63: by using electronic viewfinders
- H04N 23/80: Camera processing pipelines; Components thereof
- H04N 23/951: by using two or more images to influence resolution, frame rate or aspect ratio
- H04N 25/00: Circuitry of solid-state image sensors [SSIS]; Control thereof
- G09G 2320/0252: Improving the response speed
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change
- G09G 2340/0428: Gradation resolution change
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

Video display system is configured to include imaging device that sequentially outputs display video data of a second gradation having a second bit number smaller than a first bit number, based on captured video data of the first gradation having the first bit number, and display apparatus that sequentially displays a video based on the display video data from imaging device, and in display apparatus, when a plurality of frames continuous in time series are displayed based on the display video data, although a first gradation value based on the first gradation of a predetermined pixel included in the captured video data corresponding to the plurality of frames does not change in imaging device, a second gradation value based on the second gradation of the predetermined pixel included in the display video data corresponding to the plurality of frames varies.

## Claims

### Claim 1

A video display system comprising:
an imaging device that sequentially generates captured video data of a first gradation having a first bit number by imaging and sequentially outputs display video data of a second gradation having a second bit number smaller than the first bit number, based on the captured video data; and
a display apparatus that sequentially displays a video based on the display video data from the imaging device,
wherein, in the display apparatus, when a plurality of frames continuous in time series are displayed based on the display video data, although a first gradation value based on the first gradation of a predetermined pixel included in the captured video data corresponding to the plurality of frames does not change in the imaging device, a second gradation value based on the second gradation of the predetermined pixel included in the display video data corresponding to the plurality of frames varies.

### Claim 2 (depends on 1)

The video display system of claim 1,
wherein the imaging device includes a camera that generates the captured video data and a modulator that generates the display video data by quantizing the captured video data, and
wherein an amount of variation of the second gradation value in the display apparatus correlates with a gradation value component smaller than the second gradation generated by the quantization of the modulator.

### Claim 3 (depends on 1)

The video display system of claim 1, wherein the display apparatus includes
a display that displays a video,
a first video input interface that receives the display video data from the imaging device at a frame rate exceeding 60 fps,
a second video input interface that receives external video data from an external apparatus different from the imaging device at a frame rate of 60 fps or less, and
a switch that selectively inputs the display video data from the first video input interface and the external video data from the second video input interface to the display device.

### Claim 4 (depends on 2)

The video display system of claim 2, wherein the modulator includes
a quantizer that sequentially outputs quantized data obtained by quantizing input data based on the captured video data into the display video data,
a storage that sequentially stores the quantized data output from the quantizer,
a difference calculator that sequentially calculates differences between the captured video data of the first gradation for a current frame and the quantized data for a previous frame stored in the storage, and
an integrator that sequentially outputs integral data obtained by sequentially integrating the differences output from the difference calculator as the input data of the quantizer.

### Claim 5 (depends on 2)

The video display system of claim 2, wherein the modulator includes
a quantizer that sequentially outputs quantized data obtained by quantizing input data based on the captured video data into the display video data,
a storage that sequentially stores the quantized data output from the quantizer,
an integrator that sequentially outputs integral data obtained by sequentially integrating the quantized data stored in the storage, and
a difference calculator that sequentially calculates differences between the captured video data of the first gradation and the integral data and sequentially outputs the calculated differences as the input data of the quantizer.

### Claim 6 (depends on 2)

The video display system of claim 2, wherein the modulator includes
an oscillator that sequentially generates variation value data having the second bit number statistically or stochastically,
an adder that sequentially adds the variation value data to the captured video data of the first gradation, and
a quantizer that sequentially outputs quantized data obtained by quantizing data output from the adder into the display video data of the second gradation.

### Claim 7

A video display method performed by a video display system including an imaging device that sequentially generates captured video data of a first gradation having a first bit number by imaging and sequentially outputs display video data of a second gradation having a second bit number smaller than the first bit number, based on the captured video data, and a display apparatus that sequentially displays a video based on the display video data from the imaging device, the method comprising:
varying a second gradation value based on the second gradation of a predetermined pixel included in the display video data corresponding to a plurality of frames, in the display apparatus, when the plurality of frames continuous in time series are displayed based on the display video data, although a first gradation value based on the first gradation of the predetermined pixel included in the captured video data corresponding to the plurality of frames does not change in the imaging device.

### Claim 8 (depends on 1)

The video display system according to claim 1, wherein the imaging device, including a camera, sequentially generates the captured vide data, and sequentially outputs the display video data by quantizing the sequentially generated captured video data,
wherein an amount of variation of the second gradation value in the display apparatus correlates with a gradation value component smaller than the second gradation generated by the quantization.

### Claim 9 (depends on 1)

The video display system according to claim 1, wherein the imaging device performs operations including:
sequentially outputting quantized data obtained by quantizing input data based on the captured video data into the display video data,
sequentially storing the output quantized data into a storage,
sequentially calculating differences between the captured video data of the first gradation for a current frame and the quantized data for a previous frame stored in the storage, and
sequentially outputting integral data obtained by sequentially integrating the differences as the input data for quantizing.

### Claim 10 (depends on 1)

The video display system according to claim 1, wherein the imaging device performs operations including:
sequentially outputting quantized data obtained by quantizing input data based on the captured video data into the display video data,
sequentially storing the output quantized data into a storage,
sequentially outputting integral data obtained by sequentially integrating the quantized data stored in the storage, and
sequentially calculating differences between the captured video data of the first gradation and the integral data and sequentially outputting the calculated differences as the input data for quantizing.

### Claim 11 (depends on 1)

The video display system according to claim 1, wherein the imaging device performs operations including:
sequentially generating variation value data having the second bit number statistically or stochastically.