US 9,313,467 B2Granted

Pixel value calibration device and method

AssigneeRealtek Semiconductor Corp.

InventorsShih-Tse Chen, Wen-Tsung Huang

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Abstract

A pixel value calibration device comprises: an edge detecting unit to generate edge values according to the target pixel value of a target pixel and the pixel values of neighboring pixels in which the target and neighboring pixels are of a first color and each of them is arranged with pixels of a second color in the same pixel row; a weighted value estimating unit to generate weighted values according to the edge values and an algorithm in which the weighted values are associated with candidate pixels each of which is arranged with pixels of a third color in the same pixel row; a calibration value generating unit to generate a calibration value according to the target pixel value and the pixel value(s) of the candidate pixel(s) plus the weighted value(s) thereof; and a calibrating unit to generate a calibrated pixel value according to the target pixel and calibration values.

Claims20

Dependent claims

A pixel value calibration device operable to calibrate the pixel value of a target pixel, comprising:

an edge detecting unit operable to generate a plurality of edge detection values according to the pixel value of the target pixel and the pixel values of several neighboring pixels in which the target and neighboring pixels are of a first color and each of them is arranged with several pixels of a second color in the same row of a pixel array;
a weighted value estimating unit operable to generate a plurality of weighted values according to the edge detection values and a predetermined algorithm in which the weighted values are associated with a plurality of candidate pixels while each of the candidate pixels is arranged with several pixels of a third color in the same row of the pixel array;
a calibration value generating unit operable to generate a calibration value according to the pixel value of the target pixel and the pixel value(s) of some or all of the candidate pixels plus the weighted value(s) corresponding thereto;
and
a calibrating unit operable to generate a calibrated pixel value of the target pixel according to the pixel value of the target pixel and the calibration value.

2 more elements

A pixel value calibration method operable to calibrate the pixel value of a target pixel, comprising the following steps:

an edge detecting step operable to generate a plurality of edge detection values according to the pixel value of the target pixel and the pixel values of several neighboring pixels in which the target and neighboring pixels are of a first color and each of them is arranged with several pixels of a second color in the same row of a pixel array;
a weighted value estimating step operable to generate a plurality of weighted values according to the edge detection values and a predetermined algorithm in which the weighted values are associated with a plurality of candidate pixels while each of the candidate pixels is arranged with several pixels of a third color in the same row of the pixel array;
a calibration value generating step operable to generate a calibration value according to the pixel value of the target pixel and the pixel value(s) of some or all of the candidate pixels plus the weighted value(s) corresponding thereto;
and
a calibrating step operable to generate a calibrated pixel value of the target pixel according to the pixel value of the target pixel and the calibration value.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/565,091Filed 9 Dec 2014
Priority: TW 103108840 A12 Mar 2014
Published: US 2015/0262360 A117 Sep 2015
Granted: 12 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04N 23/843
For processing colour signals: demosaicing, e.g. interpolating colour pixel values
G06T 3/4015
Scaling of whole images or parts thereof, e.g. expanding or contracting: image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
H04N 17/002
Diagnosis, testing or measuring for television systems or their details: for television cameras
H04N 25/134
Characterised by the spectral characteristics of the filter elements: based on three different wavelength filter elements