Hardware implementation of color transforms in the analog domain for wood surface analysis Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tt44pq30z

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  • This thesis discusses the hardware implementations of certain linear and non-linear color space transforms thought to be useful in the analysis of wood surfaces for defect detection. The developmental system's color image digitizer contains 5 bits per color while the input signal contains considerably greater resolution. This often degrades the information content of the image when certain color transforms are performed. Performing these transforms at real-time speeds demands extremely fast operating hardware. In order to avoid loss of information content and obtain real-time operating speeds, the color transforms were implemented using analog circuits. Linear transforms, as proposed by Forrer ( FORR 1987), were implemented using high speed operational amplifier-based circuits. Non-linear transforms such as ratioing or intensity normalization and contrast enhancement were implemented using high-speed analog divider circuits. The results showed that, for the linear transforms described, significant improvement in image quality was observed. This was supported by analysis of the transformed image histogram. The contrast enhancement circuit has the ability to enhance certain features such as blue stain. All circuits operated at real-time speeds and the resultant images had lower noise content as compared to transformations performed digitally.
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