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Pixel aspect ratio correction using panchromatic pixels

A panchromatic pixel, aspect ratio technology, applied in the field of color images, which can solve problems such as low light performance of capture devices, achieve improved color space resolution fidelity, improve low light sensitivity, and enhance panchromatic and color space details. Effect

Inactive Publication Date: 2010-08-11
EASTMAN KODAK CO
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Problems solved by technology

The difficulty with using such a system is that only a quarter of the pixels in the color filter array have the highest light sensitivity, thus limiting the overall low light performance of the capture device

Method used

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  • Pixel aspect ratio correction using panchromatic pixels
  • Pixel aspect ratio correction using panchromatic pixels
  • Pixel aspect ratio correction using panchromatic pixels

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Embodiment Construction

[0031] In the following description, preferred embodiments of the present invention will be described generally implemented as a software program. Those skilled in the art will readily appreciate that the equivalent of such software can also be constructed in hardware. As image manipulation algorithms and systems are well known, this description will relate in particular to algorithms and systems forming part of, or cooperating more directly with, the systems and methods according to the invention. Other aspects of such algorithms and systems, as well as hardware or software for generating and otherwise processing the image signals involved therein (not specifically shown or described herein) can be obtained from such systems, algorithms, components known in the art and components to choose from. Given the systems described in accordance with the invention in the following materials, software not specifically shown, suggested or described herein for implementing the invention...

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Abstract

Method for forming an enhanced digital full-color image having a first pixel aspect ratio includes capturing an image using an image sensor having panchromatic pixels and color pixels corresponding to at least two color photoresponses wherein color and panchromatic pixels each have a second pixel aspect ratio different from the first pixel aspect ratio, providing from the captured image a digital high-resolution panchromatic image and changing the aspect ratio of the panchromatic pixel values from the second pixel aspect ratio to the first pixel aspect ratio to produce a digital aspect corrected high-resolution panchromatic image, providing from the captured image a digital low-resolution color difference color filter array image, providing a digital aspect corrected high-resolution color difference image from the low-resolution color difference color filter array image, and using the aspect corrected high-resolution panchromatic image and an aspect corrected high-resolution color difference image to produce the enhanced digital full-color image.

Description

technical field [0001] The present invention relates to forming a color image having a desired pixel aspect ratio from panchromatic images and color images having different pixel aspect ratios. Background technique [0002] Video cameras and digital still cameras typically employ a single image sensor with an array of color filters to record a scene. This approach starts with sparsely distributed single-channel images where color information is encoded graphically by a color filter array. Subsequent interpolation of neighboring pixel values ​​allows reconstruction of a full three-channel panchromatic image. The commonly understood assumption is that this panchromatic image consists of pixel values ​​sampled on a square pixel grid, ie the image pixels are square. This is important for a large number of image displays and printing devices use square pixels for subsequent image reproduction. However, the need for square pixels in a full-color image does not require a single ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/04
CPCH04N9/045H04N23/843H04N25/134
Inventor M·奥布赖恩J·F·哈米尔顿J·E·亚当斯
Owner EASTMAN KODAK CO
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