§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0443062A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Device for inspecting quality of printed matter and method thereof

Assignee: Komori Corp
•
Filing: 1990-02-22
•
Granted: —
•
Expires: 2010-02-22
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Density level of a reference printed image as a standard sample is detected, R-G-B spectrophotometrically for a color printed matter, and the result is stored, this previously inputted reference image information is taken out from a reference memory and differentiated by Sober operation into the second derivative, the processed image information is compared with a setting value from a setting device to two-dimensionally detect a sharp density changing area in the printed pattern, and the result is stored in an edge memory. On the other hand, when a printed sheet is transported, the printed pattern is detected, by a R-G-B spectral light receiving device for a color printed matter, to determine the density level, and the inspection image information is compared with a switching setting value according to an edge signal for a large change in density of printed pattern from the edge memory to judge the quality of the print.

Inventors

  • 👤 Akihiro C/O Komory Printing Machin.Co. Ltd Inde
  • 👤 Hiromitsu C/O Komori Printing Machinery Ebihara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 11:04
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T7/0004; G06T7/001; B; B41; B41F; B41F33/00; B41F33/0036; G06V; G06V10/00; G06V10/98; G06V10/993; G06T2207/00; G06T2207/10; G06T2207/10024; G06T2207/30; G06T2207/30108; G06T2207/30144

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 137 words
A quality inspection device for a printed matter for processing a sharp density changing area of reference image information of a reference printed matter by an edge control circuit to determine the presence of a defect of inspection image information of an inspected printed matter, comprising an edge control circuit having: a Sober differentiation circuit for weighting peripheral picture elements relative to a central picture element of said reference image information and adding differences between the upper and lower sides and between the right and left sides of said central picture element to obtain a Sober differential value of said central picture element, a comparator for comparing output of said Sober differentiation circuit with a setting value, and an edge memory for storing information whether or not said central picture element is said sharp density changing area.
Claim 2
Dependent Claim 34 words
The quality inspection device for a printed matter of Claim 1 wherein said reference image information and said inspection image information are obtained by a color line camera outputting image information for one line.
Claim 3
Dependent Claim 61 words
The quality inspection device for a printed matter of Claim 1 wherein a difference between said inspection image information of said inspected printed matter and said reference image information is stored in a sub-memory, and said inspection image information is judged by comparing information stored in said sub-memory with said information stored in said edge memory of said edge control circuit.
Claim 4
Dependent Claim 141 words
A quality inspection method for a printed matter for detecting a sharp density changing area of reference image information of a reference printed matter to determine the presence of a defect of inspection image information of an inspected printed matter, comprising: weighting peripheral picture elements relative to a central picture element of said reference image information and adding differences between the upper and lower sides and between the right and left sides of said central picture element to obtain a Sober differential value of said central picture element, comparing output of said Sober differential value with a setting value as a reference value of the presence of said sharp density changing area and storing information of whether or not said central picture element is said sharp density changing area, and judging said inspection image information in accordance with said stored information.
Claim 5
Dependent Claim 112 words
A quality inspection device for a printed matter comprising three series of judgment circuits for processing three primary colors of R, G, and B, said judgment circuit comprising a reference memory for storing reference image information of a reference printed matter, an edge control unit for detecting a sharp density changing picture element and a non-sharp density changing picture element with reference to said reference image information of said reference memory to output setting values for the individual picture elements, and a comparator for comparing output of said edge control unit with inspection image information of an inspected printed matter to output the presence of a defect of said inspection image information.

References Cited (Backward Citations)

GB2159623A Cited
GB2139348A Cited
EP0194331A1 Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag