Figure 5From: Bright field microscopic cells counting method for BEVS using nonlinear convergence index sliding band filter Comparison of gradient vector distribution and SBF filter enhancement results between the dark field and bright field. (a) Retinal cells image in the dark field. (b) Distribution of gradient vector for each retinal cell in (a). (c) Result of SBF filter enhancement on (a). (d) Sf9 insect cells in the bright field. (e) Distribution of gradient vector for each insect cell in (d). (f) Result of SBF filter enhancement on (d).Back to article page