Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Alexander Spivakovsky

Doron Shaked

Ruth Bergman

Oren Haik

Oded Perry

Gitit Ruckenstein

Avi Malki

Gidi Amir

Leonid Vygodner

Andrey Iossifov

Apparatus to detect a defect in a printed image and methods of detecting detects in a printed image are described. In some examples, a printing operation is initiated using image data to generate a printed image. The printed image is then scanned to generate a scanned image. A resolution of the scanned image is estimated, calculated or determined on the basis of a characteristic of the printing operation, and a reference image, having a resolution corresponding to the estimated, calculated or determined resolution, is generated from the image data. Whether defects are present in the printed image may be determined on the basis of a comparison of the reference image with the scanned image.

Image defect detection

A method for compressing a digital image to be printed, the image consisting of pixels. It is determined, for blocks of pixels, whether a block contains a graphical structure that is to be maintained without loss because it is of a type that can be accurately perceived by a human observer. The block is encoded losslessly into a less voluminous format, if such a graphical structure has been found. Otherwise, the block is compressed lossily, if no such graphical structure has been found.

Image compression

Growing community of inventors

Beit-Shemesh, Israel

Alexander Spivakovsky