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Apparatus for discerning the noticeable presence of spatial fluctuations of intensity within a two-dimensional visual field
| Details |
Inventors: Southgate, Peter D.;
Assignee: RCA Corporation (New York, NY)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner:
Attorney, Agent or Firm: Cohen; Samuel, Seligsohn; George J.
System for the analysis of an optically sensed field, useful, for example, for detecting defects in an object such as a shadow mask of a color kinescope, which permits relatively rapid examination of the article or surface being scanned. An important feature of the system is a detector linear array disposed a selected distance from the image plane of the spatial field permits higher speed sequential convolution of the spatial field at each of a plurality of overlapping segments of given length, situated at uniformly-spaced intervals along a field dimension, with a given type of limited spatial extent kernel function of said given length. |
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DETAILED DESCRIPTION What is claimed is: 1.
In an apparatus comprising signal processing means including detector means for sequentially convolving, with a given kernel function, the intensity values in each of uniformly-spaced segments aligned with a certain dimension of a two-dimensional spatial field of intensities, wherein said field is derived from an illuminated twodimensional object that is scanned in a certain direction with respect to said detector means, each segment having a given length along said certain dimension that is greater than said uniform spacing and said given kernel function being characterized by (1) having a limited spatial extent along said certain dimension corresponding to said given length, (2) having an integrated value over its limited spatial extent substantially equal to zero and (3) exhibiting a limited spatial frequency passband, and wherein said field may include certain spatial frequencies substantially higher than the upper limit of the limited spatial frequency passband of said given kernel function, the improvement: wherein said detector means comprises a linear array of contiguous detector elements oriented along given line of a given plane spaced from said object, said given line being in substantially skew relationship with said certain scan direction of said object, wherein said signal processing means comprises optical processing means including an imaging lens and a linear Gaussian spatial filter oriented substantially perpendicular to said certain dimension of said field for imaging said object on an image plane displaced a selected distance, whereby each detector element is simultaneously illuminated by light originating from an extended linear region of said field, the length of said extended region being determined by the size of said selected distance, said optical processing means as a whole exhibiting a low spatial frequency passband that includes the limited passband of said kernel function but rejects said certain higher spatial frequencies of said field, whereby said certain high spatial frequencies are removed from the illumination of said array of detector elements, and wherein said signal processing means further comprises electronic processing means including steerout means for deriving successive outputs from each of the respective detector elements of said array
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Telecommunications 
