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Matching led flash to camera's ambient light compensation algorithm

一种环境光、算法的技术，应用在照相机、用于改变发射光的光谱特性的光学元件、光学等方向，能够解决不能精确补偿照明光源等问题

Active Publication Date: 2012-02-29
LUMILEDS HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the various automatic color compensation algorithms stored in the camera are specific to a particular type of ambient light or the flash itself, even the most appropriate color compensation algorithm may not be able to accurately compensate for these two very different lighting sources

Method used

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  • Matching led flash to camera's ambient light compensation algorithm
  • Matching led flash to camera's ambient light compensation algorithm
  • Matching led flash to camera's ambient light compensation algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Using an LED die and phosphor on the die to create an LED flash for a particular camera that produces white light whose characteristics are customized to substantially match the ambient light settings programmed into the camera Set one. Each camera manufacturer may have its own standard for the type of ambient light (eg, 2500K for incandescent versus 3000K), so the LED flash is customized to substantially match one of the existing ambient light guidelines for cameras.

[0023] The present inventors have performed a test comparing the color error of different color temperatures of ambient light (using a one-color map and the δE94 standard). The inventors have found that when the camera is set to use its incandescent (tungsten) color correction algorithm, the lowest color errors are produced when the LED flash is customized to emit essentially the same color temperature as tungsten (about 2700K). The test also showed that the camera using a standard YAG type LED flash pr...

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PUM

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Abstract

A white light LED flash (53) for a digital camera (50) is described that uses a blue light LED die (22) in conjunction with red and green phosphor or quantum dot material (40) over the LED die. The phosphor or quantum dot characteristics are selected so that the white light substantially matches an ambient light setting in the camera, such as the incandescent ambient light setting. Therefore, when a flash picture is taken under incandescent ambient light, and the flash emits the same type of light as the incandescent light, the flash will effectively brighten the incandescent light. The camera's color compensation algorithm (71) associated with incandescent light illumination is then applied to the photograph and works optimally since the object is only illuminated by incandescent light. This concept is expanded to LED flashes that emulate other types of ambient light having associated color compensation algorithms programmed into the camera.

Description

technical field [0001] The present invention relates to a digital camera flash using light emitting diodes (LEDs), and more particularly, to an LED flash whose light emitting characteristics are tailored to match existing ambient light compensation algorithms implemented by the camera. Background technique [0002] The color of the image to be captured is highly influenced by the ambient light. Warm ambient light is considered to be more red and less blue than cool ambient light. Warm ambient light may be, for example, incandescent light (approximately 3000K) using tungsten filaments. Morning or afternoon sun produces less warm ambient light (around 3500K). Cooler ambient light is fluorescent (about 4500K). Sunlight, cloudy sunlight and dark sunlight produce gradually cooler light (5000-10000K). A standard xenon flash produces a cool light (around 5500K) that tends to dominate ambient light. [0003] A high quality digital camera can be manually controlled to select the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B7/08G03B15/05F21V9/02F21V9/08H04N9/73
CPCG03B7/08G03B15/05G03B2215/0567G03B7/17H04N23/88
Inventor M·布特沃特
Owner LUMILEDS HLDG BV
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