DocumentCode :
1450957
Title :
Software pixel interpolation for digital still cameras suitable for a 32-bit MCU
Author :
Sakamoto, Tadashi ; Nakanishi, Chikako ; Hase, Tomohiro
Author_Institution :
Syst. LSI Dev. Center, Mitsubishi Electr. Corp., Hyogo, Japan
Volume :
44
Issue :
4
fYear :
1998
fDate :
11/1/1998 12:00:00 AM
Firstpage :
1342
Lastpage :
1352
Abstract :
This paper discusses the interpolation technique applied to the Bayer primary color method, used frequently as the pixel structure of CCD image sensors for digital still cameras. Eight typical types of interpolation methods are discussed from three viewpoints: the characteristics of the interpolated images, the processing time required to realize their methods based on a 32-bit MCU for embedded applications, and the quality of the resultant images. In terms of reducing the occurrences of pseudocolor and achieving good color restoration, the linear interpolation method taking G´s correlation determined by using R/B pixels into consideration was found to be excellent. The measured machine cycle of the interpolation methods was approximately 46 cycles per pixel. Therefore, every method was able to interpolate a VGA-size image in approximately 0.2 seconds with the MCU operating at 60 MHz. In terms of the S/N ratio, a good image quality was obtained through the linear interpolation methods, even with shorter processing time. Based on these results it is concluded that the linear interpolation method, which takes correlation into consideration, is the most suitable for consumer product applications such as digital still cameras
Keywords :
CCD image sensors; cameras; consumer electronics; digital signal processing chips; image colour analysis; image restoration; interpolation; microcontrollers; 32 bit; 60 MHz; Bayer primary color method; CCD image sensors; MCU; S/N ratio; VGA-size image; color restoration; consumer product applications; correlation; digital still cameras; embedded applications; image quality; linear interpolation method; measured machine cycle; microcontroller unit; pixel structure; processing time; pseudocolor; software pixel interpolation; Charge coupled devices; Charge-coupled image sensors; Consumer products; Digital cameras; Filters; Image quality; Image restoration; Interpolation; Pixel; Signal resolution;
fLanguage :
English
Journal_Title :
Consumer Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0098-3063
Type :
jour
DOI :
10.1109/30.735836
Filename :
735836
Link To Document :
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