US 2024/0416670 A1Published application

Image conversion method and device for integration of a security feature into a digital image

OwnerDieter Kusin, Martin Ederer +4inventors

InventorsDieter Kusin, Martin Ederer, Anton Brunner, Michael Wanjek, Johannes Stemick, Martin Dimpfl

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Abstract

An image conversion method is provided for integrating a security feature in a digital source image to generate a target image secured by the integrated security feature. The image conversion method includes carrying out transverse-wave-shaped distortion of the source image to generate an intermediate image; generating a target image, the intermediate image being scanned by rows of pixels to define, per row of pixels of the intermediate image, a sequence of successive pixels according to the scanning, and each pixel of the sequence being transformed to a corresponding pixel of the target image. The arrangement of the respective pixels of each sequence is a transverse-wave-shaped wave packet in the target image; and the integrated security feature is defined by the wave packets.

An image conversion method (200) for integration of a security feature into a digital source image (305) in order to generate a target image (455) secured by the integrated security feature, wherein the image conversion method (200) comprises:

acquiring (205) source image data which represent a digital source image (305) to be protected by means of the security feature, which digital source image comprises pixels (315) arranged in a grid of straight parallel rows of pixels (310), each having at least one pixel value per pixel (315);
generating (210) intermediate image data, which represent an intermediate image (400) that results from the source image (305) by applying a distortion rule, according to which, for each row of pixels (310) of the source image (305), the respective pixel values of pixels (315) of the row of pixels (310) are transferred within the grid along a direction which is angled to the row of pixels (310), in particular perpendicular to the row of pixels (310), to a respective other pixel (325;
500. of the grid which, in relation to the respective pixel (315), is determined or determinable by the distortion rule in such a way that the arrangement (405;
410;
415. of these other pixels (325;
500) in the grid has a transverse waveform;
generating (220) target image data representing the target image (455), wherein:
the intermediate image (400) is scanned in rows of pixels in order to define for each row of pixels of the intermediate image (400) a sequence of pixels (425, 430, 435, 440, 445, 450) that follow each other according to the scanning, the pixel values of which have resulted from the transfer of corresponding pixel values from the source image (305) in accordance with the distortion rule;
each pixel (425, 430, 435, 440, 445, 450) of the sequence is transformed into a respective corresponding pixel (425a, 430a, 435a, 440a, 445a, 450a) of the target image (455) by determining its position in the target image (455) based on its position in the intermediate image (400) by compensating for the distortion suffered by applying the distortion rule when generating the intermediate image (400), so that the arrangement (405;
410;
415) of the respective pixels of each sequence in the target image (455) represents a transverse-wave-shaped wave packet;
and
the integrated security feature is defined by the wave packets.

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Abstract

Claims21