Patent ID: 11967002
Assignee: AXIS AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A non-transitory computer program storage device, comprising computer readable code stored therein that when executed on an image-processing device causes the image-processing device to perform a method comprising:
obtaining a digital colour image, and
applying a linear random function (f) to a respective colour vector representing colour components of a respective pixel of the digital colour image to obtain an anonymized monochrome colour image,
wherein the linear random function (f) varies over the pixels of the digital colour image,
wherein the linear random function (f) further is dependent on at least one random parameter,
wherein the linear random function (f) is a polynomial of a pixel location within the digital colour image, and
wherein applying the linear random function (f) comprises one of
projecting the colour vector with a linear random projection function (f1) onto a one-dimensional colour component, or
rotating the colour vector with a linear random rotation function (f2), thereby obtaining a rotated colour vector, and projecting the rotated colour vector with a projection function onto the one-dimensional colour component.