Patent ID: 8717617

Claim:
A handheld device comprising: an input/output (I/O) module configured to print images on a surface adjacent to the handheld device as the handheld device is being moved across the surface; a position module operatively coupled to the I/O module, wherein the position module is configured to estimate a velocity of the handheld device as the handheld device is being moved across the surface; a filter coupled to the I/O module, wherein the filter is configured to based at least in part on (i) the estimated velocity of the handheld device and (ii) a quantity of printing substance to be deposited on the surface adjacent to the handheld device, generate a print velocity term, generate a random number or a pseudo-random number, compare the print velocity term with the generated random number or the pseudo-random number, and in response to comparing the print velocity term with the generated random number or the pseudo-random number, regulate a rate of deposition of the printing substance on the surface adjacent to the handheld device as the I/O module prints images on the surface adjacent to the handheld device.