After this transformation, a morphological opening is performed to decrease scattered grey levels.
For further refinement, morphological opening is applied using structure element which is equal to the width of a road.
The opening of X by Y is the union of all translations of Y that fit entirely with X. Morphological opening is applied on resultant image from morphological closed operation to remove unwanted portions.
A morphological opening is then applied to remove the noise in the depth map D. The depth background image DBG is computed over several frames by a non-evolutive temporal median: DBG u, v = median { D t 0, u, v, D t 0 + Δt, u, v, …, D t 0 + kΔt, u, v }. (4).
Then, a morphological opening was applied to remove isolated groups of pixels.
Sectors to be removed are smoothed over time and circumferentially in each slice and a morphological opening is performed to get a cohesive region to remove.
The operation of the division of each RGB color component of the image by its version after morphological opening was performed independently for each channel.
A hybrid method of using artificial neural network, contour tracing algorithm, and morphological trivial opening is used to extract road from remotely sensed image and is presented by Sowmya et al. [30].
In this paper, two binary non-linear filters, the three-point median filter and the 2×2-pixel morphological opening filter are designed using nanoelectronic single-electron circuitry.
For elimination of fake points of image, morphological opening filter is used and for filling holes, morphological closing filter is applied on the image.
