Heidelberger Druckmaschinen Ag

Frank Soltwedel

Frank Schumann

Michael Gieser

Immanuel Fergen

Jan Krieger

Peter Eisele

Robert Mueller

Uwe Peters

Sascha Epp

Martin Klüpfel

Manfred Miessl

Daniel Blatt

Volker Felzen

Manfred Mießl

A method of controlling the quality of printed products by using a computer includes always producing multiple printed products with at least partially identical image content in a printing machine in a course of a print job to be completed. The multiple printed products are recorded by at least one image sensor and are sent to the computer as digital image data. The computer examines and assesses the digital image data in an image inspection process to find print defects and to sort out printed products that have been found to be unusable. The computer assesses the identical image content of the digital image data of at least two consecutive printed products and only takes into consideration such detected print defects that are present on the at least two assessed consecutive printed products.

Method of controlling the quality of printed products by image inspection filtering

A method of inspecting images on printed products by a computer in a printing machine. Printed products are recorded and digitized by an image sensor of an image inspection system in the course of the image inspection process, and the computer compares them to a digital reference image. If deviations are found, the defective printed products are removed. The computer analyzes the deviations found in the course of the image inspection process together with further data from other system parts and from the machine, determines specific defect classes and the causes thereof based on the defects by machine learning processes, assigns the defects found in the image inspection process to the defect classes in a corresponding way, and displays the classified detected defects with their defect classes and causes to an operator of the machine so that the operator can initiate specific measures to eliminate the defect causes.

Printed image inspection method with defect classification

A method is provided for checking an image inspection system having a camera system with a camera, an illumination apparatus for targeted illumination of a printing substrate, an image processing computer, and a main computer, for quality control of products of a printing substrate processing machine by using the main computer. A reference image is entered and transmitted to the main computer, a current printing image recorded by the camera system is transmitted to the image processing computer, a partial image in a suitable region of the current printing image, not being printed with printing image data, is selected in the image processing computer, the partial image is analyzed by comparison with the reference image in the image processing computer, and the inspection system is assessed based on the analysis of the partial image by the main computer and any defects of the inspection system being found are indicated.

Method for checking an image inspection system

A method for testing the reliability of an error detection of an image inspection method by using a computer includes producing a defective test image by superposing specific error elements on an error-free reference image, carrying out the image inspection method with the defective test image, comparing the errors found by the image inspection method with the error set to be expected with the aid of the known errors added to the test image, and evaluating the reliability of the image inspection method with the aid of the difference between found and expected errors.

Method for testing the reliability of error detection of an image inspection method

An apparatus includes a mobile control device for safe operation of machines for processing printing materials. The machine is divided into a plurality of spatially delimited zones and the position of the control device can be detected in relation to the plurality of zones. It is possible to determine the zone in which the control device is located by using the position of the control device. Certain functions of the machine are enabled or disabled depending on the determined zone. A printing press having the device and a method for safely operating a machine for processing printing materials, are also provided.

Apparatus for operating a printing press with a plurality of operating zones, printing press and machine having the apparatus and method for safely operating a machine

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Sinsheim/Hoffenheim, Germany

Frank Soltwedel