METHOD OF ENHANCING DIGITAL IMAGE QUALITY Russian patent published in 2010 - IPC G06T5/00 G06K9/40 

FIELD: physics.

SUBSTANCE: invention proposes to use an imaging model with separation of effects associated with reflecting power of the surface R and effects associated with scene illumination characteristics L, for which: quality of a recorded image is evaluated and if there is need to correct the image, noise is filtered off; a smaller copy of the image is formed; borders for subsequent contrast enhancement at the correction step are defined on the smaller copy; the luminance channel of the initial image is selected and filtered; the image is corrected in accordance with an empirical equation of the LR imaging model:

where A is the lower boundary of contrast enhancement of the smaller copy of the image; Φ and ψ are lower and upper boundaries of contrast enhancement of the converted image; J_B is the brightness component of the initial image after bilateral filtering; γ is a non-linear conversion parameter and J_F is the brightness component of the enhanced image; and the resultant image is converted to RGB colour space.

EFFECT: higher image quality.

7 cl, 19 dwg, 2 tbl