IEEE Trans Image Process - Characterization of electrophotographic print artifacts: banding, jitter, and ghosting.

Tópicos

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Resumo

Electrophotographic (EP) print banding, jitter, and ghosting artifacts are common sources of print quality degradation. Traditionally, the characterization of banding and jitter artifacts relies mainly on the assumption that the defect has either a horizontal or vertical orientation which permits the simple 1-D analysis of the defect profile. However, this assumption can easily be violated if a small amount of printer or scanner skew is introduced to the analyzed images. In some cases, the defect can inherently be neither vertical nor horizontal. In this case, unless the defect orientation has been accurately detected before analysis, the 1-D-based approaches could bias the estimation of the defect severity. In this paper, we present an approach to characterize the jitter and banding artifacts of unrestricted orientation using wavelet filtering and 2-D spectral analysis. We also present a new system for detecting and quantifying ghosting defects. It includes a design for a printed test pattern to emphasize the ghosting defect and facilitate further processing and analysis. Wavelet filtering and a template matching technique are used to detect the ghost location along and across the scanned test pattern. A new metric is developed to quantify ghosting based upon its contrast, shape, and location consistency. Our experimental results show that the proposed approaches provide objective measures that quantify EP defects with a rank ordering correlation coefficient of 0.8 to 0.98, as compared to the subjective assessment of print quality experts.

Resumo Limpo

electrophotograph ep print band jitter ghost artifact common sourc print qualiti degrad tradit character band jitter artifact reli main assumpt defect either horizont vertic orient permit simpl d analysi defect profil howev assumpt can easili violat small amount printer scanner skew introduc analyz imag case defect can inher neither vertic horizont case unless defect orient accur detect analysi dbase approach bias estim defect sever paper present approach character jitter band artifact unrestrict orient use wavelet filter d spectral analysi also present new system detect quantifi ghost defect includ design print test pattern emphas ghost defect facilit process analysi wavelet filter templat match techniqu use detect ghost locat along across scan test pattern new metric develop quantifi ghost base upon contrast shape locat consist experiment result show propos approach provid object measur quantifi ep defect rank order correl coeffici compar subject assess print qualiti expert

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