This paper presents a real time automatic image correction technique operating under real-time
constraints (25ms) to address red dot artifacts in low resolution display panels. The algorithm is
designed as a two stage process, starting with the identification of pixels which could cause such
artifacts followed by a color correction scheme to compensate for any perceived visual errors.
Artifact inducing pixels are identified by thresholding the vector color gradient of the image.
The color levels of the adjacent subpixels around the artifacts are estimated based on partitive
spatial color mixing. Red dot artifacts occur as singlet, couplets or triplets and consequently three
different correction schemes are explored. The algorithm also ensures that artifacts occurring
at junctions, corners and cross sections are corrected without affecting the underlying shape or
contextual sharpness. The performance of our algorithm was benchmarked using a series of 30
corrected and uncorrected images by human observers. This algorithm is designed as a general
purpose color correction technique for display panels with an offset in their subpixel patterns
and can be easily implemented as an isolated real time post processing technique for the output
display buffer without any higher order processing or image content information. All the above
mentioned benefits are realized through software and don’t require any upgrade or replacement
of existing hardware.