US 6,445,452 B1Granted

Device for checking sheet packaging

AssigneeYuki Engineering System Co., Ltd.

InventorsKiyoyuki Kondou, Minoru Ito

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Abstract

A device for checking sheet packaging, whereby all the defects of packaged articles or sheets are easily and highly accurately detected based on the density or color distribution of reflection and transmission images. Defects such as deformation, discoloration, foreign matters and contamination of an article (16) packaged with a sheet and the sheet are detected by forming a density distribution code image or color code distribution image or by executing inter-image calculation based on a reflection image, a transmission image, or density or color images thereof. The upper and lower light sources are simultaneously turned on to separately form a reflection image and a transmission image from the input image in order to enhance the checking efficiency. Furthermore, a reflector (17) is disposed under a packaging sheet to enhance image contrast and to improve checking efficiency and stability. Optimum conditions for the kind and position of the reflector are clarified.

Claims23

Dependent claims

A sheet wrapping package inspecting device which detects a defect of at least one of a wrapping sheet and an object to be wrapped, such as at least one of shape, crack, broken piece, dirt, stain, mixed foreign material and the like, comprising:

a first light source (3;
14) for lightening the wrapping sheet (1;
16), said first light source being located at a first side of the wrapping sheet;
a second light source (5;
14, 17), for lightening the wrapping sheet (1;
16), said second light source being located at a second side of the wrapping sheet;
a two-dimensional sensor (2;
11) located at one of said first and second sides of the wrapping sheet and object (1;
16), for observing the wrapping sheet and object so as to produce signals of a reflected ray image of said wrapping sheet and object by light rays originating from one of said first and second light sources, and signals of a transmitted ray image of said wrapping sheet and object by light rays originating by the other of said first and second light sources;
and
a signal processing means (7) being provided for putting signals derived from said reflected ray image and from the transmitted ray image into mutual relationship,
wherein said signal processing means (7) is provided for binarization or multi-valuing of the reflected ray image and of the transmitted ray image so as to create a code distribution image.

9 more elements

A sheet wrapping package inspecting method for detecting a defect of a wrapping sheet and an object to be wrapped, such as shape, crack, broken piece, dirt, stain, mixed foreign material, or the like, comprising the steps of:

lightening the wrapping sheet (1;
16) and object from a first side;
lightening the wrapping sheet (1;
16) and object from a second side;
observing the wrapping sheet and object so as to produce signals of a reflected ray image of said wrapping sheet and object and of a transmitted ray image of said wrapping sheet and object by light rays;
and
being provided signal processing for putting signals derived from said reflected ray image and from the transmitted ray image into mutual relationship,
wherein said signal processing is provided for binarization or multi-valuing of the reflected ray image and of the transmitted ray image so as to create a code distribution image.

5 more elements

Dependencies are inferred from the claim text.