Image analysis – Image transformation or preprocessing – Changing the image coordinates
Reexamination Certificate
2000-09-11
2004-01-27
Mehta, Bhavesh M. (Department: 2625)
Image analysis
Image transformation or preprocessing
Changing the image coordinates
C382S162000, C348S277000, C345S649000, C358S535000
Reexamination Certificate
active
06683996
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a method and apparatus for rotating Bayer images.
The invention has been developed primarily for a digital camera including an integral printer for providing a paper print of an image captured by the camera and will be described hereinafter with reference to that application. However, it will be appreciated that the invention is not limited to that particular field of use.
SUMMARY OF INVENTION
According to a first aspect of the invention there is provided method for sampling a Bayer image having two dimensional planes of red, green and blue pixels, the method including the steps of:
rotating the green plane by 45 degrees; sequentially sampling an m×m pixel block of the rotated image, where m is an integer greater than 1;
providing an address for the m
2
samples by determining a starting address for a first of the samples and thereafter applying a predetermined fixed sequence of offsets to obtain the addresses of the remaining samples.
Preferably, the step of determining the starting address is responsive to the relative rotational orientation of the image. More preferably, m=4 and there are sixteen offsets.
According to a second aspect of the invention there is provided an apparatus for sampling a Bayer image having two dimensional planes of red, green and blue pixels, the apparatus including:
input means for rotating the green plane by 45 degrees;
processing means for sequentially sampling an m×m pixel block of the rotated image, where m is an integer greater than 1;
address means for providing an address for the m
2
samples by determining a starting address for a first of the samples and thereafter applying a predetermined fixed sequence of offsets to obtain the addresses of the remaining samples.
Preferably the step of determining the starting address is responsive to the relative rotational orientation of the image. More preferably, m=4 and there are sixteen offsets.
REFERENCES:
patent: 4591900 (1986-05-01), Heeb et al.
patent: 6236433 (2001-05-01), Acharya et al.
patent: 6466618 (2002-10-01), Messing et al.
patent: 6571021 (2003-05-01), Braudaway
Rotated Dispersed Dither: A New Technique for Digital Halftoning by Ostromoukhov et al., Computer Graphics Proceedings. Annual Conference Series 1994. Siggraph 94 Conference Proceedings, pp 123-130, Orlando, Fl, USA, Jul. 24-29, 1994.
Halftoning by Rotating Non-Bayer Dispersed Dither Arrays by Ostromoukhov V. et al., Procedings of the SPIE—The International Society for Optical Engineering, Vol, 2411, pp 180-197, 1995.
Mehta Bhavesh M.
Patel Kanji
Silverbrook Research Pty Ltd
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