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Flicker detection using semiconductor light source

A semiconductor, light-emitting technology used in the field of capturing images

Active Publication Date: 2017-11-28
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such methods are not helpful in preventing artifacts in the analyzed images, and such methods require the main CPU for analysis and sampling, or to detect ambient light on the front of the device when the rear camera is in use

Method used

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  • Flicker detection using semiconductor light source
  • Flicker detection using semiconductor light source
  • Flicker detection using semiconductor light source

Examples

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Embodiment Construction

[0026] Introduction

[0027] Various embodiments of devices, systems, and methods for determining adjustments to a rolling shutter exposure window based on a period of frequency of ambient light are disclosed. In an embodiment, by utilizing a light source (eg, a strobe LED) as an input sensor, a signal providing a frequency of ambient light can be generated. In an embodiment, sensor exposure limits may be adjusted based on this signal such that undesired artifacts (eg, "beat" patterns) are eliminated during the image capture process. In some embodiments, a device or system may be configured with a semiconductor-based multimodal device adapted to operate in various modes. For example, a semiconductor-based multimodal device may be configured to function as a sensor that receives ambient light and generates a signal indicative of one or more characteristics of the ambient light. The same semiconductor-based multimodal device can be configured to provide other functions in ad...

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Abstract

Devices and methods for adjusting an exposure window of a rolling shutter based on a frequency determined from ambient light gathered by a bimodal component are disclosed. Flickering light sources may cause artifacts in captured images, due to interplay between a period of a frequency of ambient light and the exposure window. An image capture device includes a semiconductor component configured to operate in two modes and an exposure window control component configured to compensate for the flickering based on a signal from the light source. In a sensor mode, the semiconductor component may operate to detect the frequency of ambient light. To avoid image artifacts, the frequency of the ambient light is analyzed and an exposure time is adjusted to an integer multiple of the period of the frequency such that exposure is matched to the periodic illumination of the flickering light source.

Description

technical field [0001] The present disclosure relates generally to capturing images, and more particularly to compensating for variations in ambient lighting at the time of image capture. Background technique [0002] Suboptimal performance can arise when an image capture device is required to capture high-quality images in a variety of different environments. For example, the number of features that an image capture device calls upon to affect the lighting of objects in the field of view is relatively small. Typically, some type of light source, such as a flash or light emitting diode (LED) or other type of light, may be provided to portable image capture devices so that the devices can add illumination to the scene being captured. [0003] However, some scenes that are well lit may be adversely affected by ambient lighting that has characteristics that may be detrimental to providing a high quality, visually appealing image. In such cases, adding additional light from th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/235
CPCH04N23/56H04N23/745H04N25/531
Inventor D·K·陶A·K·沙玛
Owner APPLE INC
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