Method of adjusting digital camera image processing parameters

a digital camera and image processing technology, applied in the field of digital image processing, can solve the problems of overexposure and underexposure, more noise in the processed image taken at high iso settings,

Inactive Publication Date: 2013-05-23
FOVEON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method to adjust the processing parameters for images captured by a digital camera based on the "capture parameters" (the technical effect of the camera settings) and the "image statistics" (the characteristics of the captured images). By using both capture parameters and image statistics, a more accurate and precise adjustment of the image processing parameters can be achieved. This results in better quality and more visually appealing photos.

Problems solved by technology

However, since aggressive noise reduction smoothes out fine details and blurs the edges in the image, it is also possible to leave more noise in the processed images taken at high ISO settings compared to the processed images taken at low ISO settings.
Unfortunately, the ISO setting is a global parameter which does not address the problem of excessive highlights, deep shadows, and uneven illumination in the scene, and also does not account for overexposure and underexposure effects introduced through the automatic camera capture process or by the user.

Method used

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Embodiment Construction

[0015]Persons of ordinary skill in the art will realize that the following description of the present invention is illustrative only and not in any way limiting. Other embodiments of the invention will readily suggest themselves to such skilled persons.

[0016]The present invention provides methods for adjusting image processing parameters to achieve improved performance of a given digital camera image processing pipeline. This invention is not limited to the specific examples presented below.

[0017]According to the present invention methods are disclosed that estimate the ISO setting using the capture parameters and image statistics. This setting, which is an estimation of camera sensitivity, is used to adjust the image processing parameters which are typically determined in calibration according to certain numerical image quality criteria and subjective evaluation of processed images.

[0018]Formally, each standard ISO setting in a digital camera, expressed as u∈ U, for U={100, 200, 40...

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Abstract

A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.

Description

RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Patent Application Ser. No. 61 / 487,876, filed May 19, 2011.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to processing of digital images. More particularly, the present invention relates to methods for adjusting digital camera image processing parameters in order to achieve improved performance of a digital camera image processing pipeline.[0004]2. The Prior Art[0005]It is quite common that the main camera image processing parameters, particularly, those used to control the noise reduction process, are linked to the ISO sensitivity setting. The quality of images taken at various ISO settings depends greatly on the quality of the algorithm used for noise reduction.[0006]Since noise increases with the increase of ISO sensitivity, as usually demonstrated in terms of the signal-to-noise ratio measurements, it is often necessary to use more aggressive noise reduction at higher ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/235
CPCH04N5/2353H04N23/73G06T1/20
Inventor LUKAC, RASTISLAV
Owner FOVEON
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