International Journal of Aerospace Engineering / 2016 / Article / Fig 7

Research Article

Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques

Figure 7

Variation trend of focus evaluation function.
(a) Gradient square sum function
(b) Laplace operator sum function
(c) Roberts gradient sum of squares function
(d) Secondary polynomial function

We are committed to sharing findings related to COVID-19 as quickly as possible. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. Review articles are excluded from this waiver policy. Sign up here as a reviewer to help fast-track new submissions.