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Robinson Compass Mask
In image processing, a Robinson compass mask is a type of compass mask used for edge detection. It has eight major compass orientations, each will extract the edges in respect to its direction. A combined use of compass masks of different directions could detect the edges from different angles. Technical explanation The Robinson compass mask is defined by taking a single mask and rotating it to form eight orientations: \text\begin -1 & 0 & 1 \\ -2 & 0 & 2 \\ -1 & 0 & 1 \end \text\begin 0 & 1 & 2 \\ -1 & 0 & 1 \\ -2 & -1 & 0 \end \text\begin 1 & 2 & 1 \\ 0 & 0 & 0 \\ -1 & -2 & -1 \end \text\begin 2 & 1 & 0 \\ 1 & 0 & -1 \\ 0 & -1 & -2 \end \text\begin 1 & 0 & -1 \\ 2 & 0 & -2 \\ 1 & 0 & -1 \end \text\begin 0 & -1 & -2 \\ 1 & 0 & -1 \\ 2 & 1 & 0 \end \text\begin -1 & -2 & -1 \\ 0 & 0 & 0 \\ 1 & 2 & 1 \end \text\begin -2 & -1 & 0 \\ -1 & 0 & 1 \\ 0 & 1 & 2 \end The direction axis is the line of zeros in the matrix. Robinson compass mask is similar to kirsch compass masks, but is simp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Image Processing
An image or picture is a visual representation. An image can be two-dimensional, such as a drawing, painting, or photograph, or three-dimensional, such as a carving or sculpture. Images may be displayed through other media, including a projection on a surface, activation of electronic signals, or digital displays; they can also be reproduced through mechanical means, such as photography, printmaking, or photocopying. Images can also be animated through digital or physical processes. In the context of signal processing, an image is a distributed amplitude of color(s). In optics, the term ''image'' (or ''optical image'') refers specifically to the reproduction of an object formed by light waves coming from the object. A ''volatile image'' exists or is perceived only for a short period. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode-ray tube. A ''fixed image'', also called a hard copy, is one that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
