Howtosignalprocessing
- How can you tell that a pixel is on an edge?
- What are diagonal edges?
- What is an edge pixel?
- Which of the following filters detects vertical edges?
How can you tell that a pixel is on an edge?
Check the left and the right neighboring gradient values. iii. If the gradient at the present pixel is greater than its left and right neighbors, then it is considered an edge, else it is discarded.
What are diagonal edges?
In Mathematics, a diagonal is a line that connects two vertices of a polygon or a solid, whose vertices are not on the same edge. In general, a diagonal is defined as a sloping line or the slant line, that connects to the vertices of a shape.
What is an edge pixel?
An edge pixel is a pixel whose grey level is different from that of an adjacent pixel. The figure below shows an array of pixels with varying grey levels. An image edge, denoted by a dashed line, runs diagonally across the figure from bottom-left to top-right.
Which of the following filters detects vertical edges?
Vertical edges can be detected by using a horizontal gradient operator followed by a threshold operation to detect the extreme values of the gradient. The gradient produces a doublet of extremes, positive-negative or negative-positive, depending on the direction of the transition.
