Apparatus and method for determining image quality
November 25, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApparatus for selecting originals for copying on the basis of image sharpness Method and apparatus for previewing exposed photographic films or the like Apparatus for adjusting a facsimile document scanner Device for measuring amount of tone correction Real time automated inspection Method and system for automatically detecting camera picture element failure Automatic white level control for a RIS Method of and arrangement for determining the sharpness of originals for reproduction Method for focus adjustment of a picture scanning and recording system Apparatus for sensing the condition of a document InventorsApplicationNo. 292545 filed on 08/18/1994US Classes:382/112, Document or print quality inspection (e.g., newspaper, photographs, etc.)382/309EDITING, ERROR CHECKING, OR CORRECTION (E.G., POSTRECOGNITION PROCESSING)ExaminersPrimary: Mancuso, JosephAssistant: Chang, Jon Attorney, Agent or FirmInternational ClassG06T 007/00AbstractInvented method, apparatus, and computer program product for determining image quality can be employed either during diagnostic mode or at run time of an imaging system. One component performs numerical analysis on a digital image. Another component accepts or rejects the quality of the digital image based on the results of the numerical analysis. In one embodiment, if the cumulative harmonic content of Fourier component amplitudes of a synthesized scan line exceeds a threshold value, the digital image is rejected as being of inadequate quality; otherwise the digital image is accepted. In another embodiment, a maximum gradient of a scan line of the digital image is computed. If, for some specified number of occurrences during a scan of a target, the maximum gradient exceeds a ceiling value or falls below a floor value, then the image is rejected.Other References
Field of SearchDocument or print quality inspection (e.g., newspaper, photographs, etc.)Intensity, brightness, contrast, or shading correction Artifact removal or suppression (e.g., distortion correction) Measuring image properties (e.g., length, width, or area) EDITING, ERROR CHECKING, OR CORRECTION (E.G., POSTRECOGNITION PROCESSING) Color correction Focus measuring or adjusting (e.g., deblurring) Variable threshold, gain, or slice level Based on peak levels Pattern boundary and edge measurements Edge or contour enhancement Global features (e.g., measurements on image as a whole, such as area, projections, etc.) Flaw detector Of surface (e.g., texture or smoothness, etc.) By detecting contrast Detection of peak or slope of image signal Measuring, testing, and calibrating | |
