Method of and arrangement for blurring an image

A computer implemented system for reducing the spatial resolution of images, the system comprising:

• a processor;
• and
• memory connected to the processor, the memory comprising a computer program comprising data and instructions arranged, when executed, to allow said processor to:
• acquire an input image comprising image parts having a spatial resolution larger than a predefined threshold SR pixels/meter, wherein the spatial resolution is associated with a clarity of an image;
• acquire a depth map associated with said input image;
• determine for each pixel p(x,y) a spatial resolution value by means of the depth map;
• and
• process a region of pixels of said input image for which holds that the spatial resolution value is larger than the predefined threshold SR pixels/meter corresponding to an object in the input image to be privacy protected to obtain a corresponding region of pixels having a spatial resolution value less than 100 pixels/meter to protect privacy information related to human faces and less than 50 pixels/meter to protect privacy information related to license plates in an output image.

A computer program product for use in a data processing system, for reducing the spatial resolution of images, the computer program product comprising a non-transitory computer readable medium storing instructions, which when executed, allows a processor to:

• acquire an input image comprising image parts having a spatial resolution larger than a predefined threshold SR pixels/meter, wherein the spatial resolution is associated with a clarity of an image;
• acquire a depth map associated with said input image;
• determine for each pixel p(x,y) a spatial resolution value by means of the depth map;
• and
• process a region of pixels of said input image for which holds that the spatial resolution value is larger than the predefined threshold SR pixels/meter corresponding to an object in the input image to be privacy protected to obtain a corresponding region of pixels having a spatial resolution value less than 100 pixels/meter to protect privacy information related to human faces and less than 50 pixels/meter to protect privacy information related to license plates in an output image.