Study on definition evaluation function based on image contrast variation
Study on definition evaluation function based on image contrast variation
- Author(s): Chen Guojin ; Zhu Miaofen ; Zhang Kesong
- DOI: 10.1049/cp:20070812
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- Author(s): Chen Guojin ; Zhu Miaofen ; Zhang Kesong Source: China-Ireland International Conference on Information and Communications Technologies (CIICT 2007), 2007 p. 1038 – 1043
- Conference: China-Ireland International Conference on Information and Communications Technologies (CIICT 2007)
- DOI: 10.1049/cp:20070812
- ISBN: 978 0 86341 827 3
- Location: Dublin, Ireland
- Conference date: 28-29 Aug. 2007
- Format: PDF
The definition evaluation function of digital image plays a key role in the auto-focus technology based on image, and it not only determines the auto-focus validity of a whole system, but its algorithm determines the real time characteristic of the whole hardware. This paper analyses the imaging principle, and brings forward that the focusing characteristic curves should meet no-bias, single peak, high defocusing sensitivity, enough signal-to-noise ratio and little calculation quantity. In the paper the preprocessing methods of CMOS image are discussed, the evaluation method based on the image contrast variation is presented in accordance with the existing problems of common image definition functions. From the result of emulation experiments, the focusing curves of the definition evaluation function based on contrast variation are good in focusing characteristics, strong in anti-jamming ability and excellent in real time.
Inspec keywords: image processing; focusing; CMOS image sensors
Subjects: Optical, image and video signal processing; Computer vision and image processing techniques
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