[특허]Process for detecting and mapping dirt on the surface of a photographic element

Process for detecting and mapping dirt on the surface of a photographic element 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/88
출원번호	US-0934089 (1992-08-21)
발명자 / 주소	Gray Robert T. (Rochester NY) Patton David L. (Webster NY)
출원인 / 주소	Eastman Kodak Company (Rochester NY 02)
인용정보	피인용 횟수 : 58 인용 특허 : 0

초록 ▼

A method and associated apparatus for detecting the amount, size, shape, and location of anomalies, such as dirt and scratches, on the surface of a test photographic element after the application of a cleaning procedure and for objectively determining the effectiveness of the film cleaning devices and procedures at removing dirt from photographic negatives and slides and the scanner\s sensitivity to the artifacts on the test photographic element\s surface. The test photographic element is scanned and the scanned image is digitized and converted to color digital count values. The count values are corrected for systematic errors and a set of context dependent threshold values on the corrected data is computed. If the corrected data passes any of the series of threshold tests it classified as anomalous otherwise it is considered to be background or clean. A series of statistics are calculated for the detected anomalies and are reported to the operator. This report enables the operator to monitor and maintain the quality of the cleaning process.

대표청구항 ▼

A method for determining the presence of anomalies on the surface of a photographic element having a film grain, said film grain having an essentially Gaussian density distribution, said method comprising the steps of: (a) forming non-enhanced original image data of a sample of the photographic element; (b) storing the formed non-enhanced original image data produced from step (a); (c) forming an alpha-trimmed mean smoothed rendition of the non-enhanced original image data, said alpha-trimmed mean smoothed rendition of the non-enhanced original image data effectively filtering said essentially Gaussian density distribution of said film grain and being resistant to the presence of said anomalies; (d) conditioning the stored non-enhanced original image data to remove spatial variations not caused by anomalies by calculating the difference image between the non-enhanced original image data and the alpha-trimmed mean smoothed rendition of the non-enhanced original image data to form conditioned original image data values, said conditioned original image data values retaining said essentially Gaussian density distribution of said film grain; and (e) comparing the formed conditioned original image data values with a plurality of reference conditions based on Gaussian probability statistics of said film grain to determine the existence of an anomaly.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Process for detecting and mapping dirt on the surface of a photographic element 원문보기

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Process for detecting and mapping dirt on the surface of a photographic element 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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