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Camera with rotating polarizing filter

A filter and camera technology, applied in the field of cameras, can solve problems such as increased exposure time

Active Publication Date: 2011-11-30
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polarizing filters block 60% of the light, they increase the required exposure time to unacceptable levels

Method used

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  • Camera with rotating polarizing filter
  • Camera with rotating polarizing filter
  • Camera with rotating polarizing filter

Examples

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Embodiment Construction

[0027] Polarizing filters are known to be useful in reducing glare and thereby creating more color contrast. When viewing the scene through the viewfinder of a digital camera, it is often difficult to discern the preferred rotation of the filter, as the image quality in the electronic display may not be sufficient for the effect, and the display may automatically "correct" the colors in the display. Thus, a photographer may find it necessary to remove the polarizer, place it in front of their eye, find the proper rotation and then reinstall the filter at that rotation. This makes the use of polarizing filters impractical for most photography.

[0028] The present invention eliminates this problem by monitoring or analyzing the output of the camera's image sensor as the polarizing filter is rotated prior to capturing the image. From this analysis, the desired rotation of the polarizing filter can be determined. The filter can then be rotated to this desired angle and an image...

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PUM

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Abstract

The present invention relates to cameras and other image capture devices. More particularly, the present invention relates to an image capture device having a polarizing filter that reduces reflected light during operation of the image capture device.

Description

technical field [0001] The present invention relates to cameras. More specifically, the present invention relates to cameras having polarizing filters that reduce reflected light during camera operation. Background technique [0002] Bounce light effects have always been a common problem for professional and novice photographers alike. Light from various objects in the scene to be photographed includes not only light having the color of the object, but also light that may be mirror-reflected from the object. While specular reflection (also known as gloss) from an object increases the visual appeal of an object, such as the finish of a car, specular reflection from an object can also reduce the apparent saturation, apparent depth, or Apparent strength to reduce visual impact. [0003] It is well known that specularly reflected light from a surface of an object becomes at least partially polarized; that is, the electric field vector of the reflected light tends to be orient...

Claims

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Application Information

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IPC IPC(8): H04N5/225G02B5/20
CPCH04N5/23232G03B7/18H04N5/23293H04N5/2254G02B27/281G03B17/14H04N23/951
Inventor J·A·卡特伯格
Owner APPLE INC
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