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negation of the first four results. An edge, or contour is an tiny area with neighboring distinct pixel values. The convolution of each mask with the image would create a high value output where there is a rapid change of pixel value, thus an edge point is found. All the detected edge points would line up as edges.
1187:
Babu C.R., Sreenivasa Reddy E., Prabhakara Rao B. (2015) Age Group
Classification of Facial Images Using Rank Based Edge Texture Unit (RETU). In: Mandal J., Satapathy S., Kumar Sanyal M., Sarkar P., Mukhopadhyay A. (eds) Information Systems Design and Intelligent Applications. Advances in Intelligent
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The direction axis is the line of zeros in the matrix. Robinson compass mask is similar to kirsch compass masks, but is simpler to implement. Since the matrix coefficients only contains 0, 1, 2, and are symmetrical, only the results of four masks need to be calculated, the other four results are the
1206:
S Edy Victor
Haryanto, M. Y. Mashor, A. S. Abdul Nasir, H. Jaafar, "A fast and accurate detection of Schizont plasmodium falciparum using channel color space segmentation method", Cyber and IT Service Management (CITSM) 2017 5th International Conference on, pp. 1-4,
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335:. 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.
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Dr. Borislav D Dimitrov, Dr. Vishal Goyal, Mr. Nehinbe Joshua, Mr. Vassilis
Papataxiarhis "International Journal of Computer Science Issues(Volume 8, Issue1)", IJCSI PUBLICATION, Jan 2011,
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An example of
Robinson compass masks applied to the original image. Obviously, the edges in the direction of the mask is enhanced.
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1081:{\displaystyle {\text{North East:}}{\begin{bmatrix}-2&-1&0\\-1&0&1\\0&1&2\end{bmatrix}}}
895:{\displaystyle {\text{South East:}}{\begin{bmatrix}0&-1&-2\\1&0&-1\\2&1&0\end{bmatrix}}}
709:{\displaystyle {\text{South West:}}{\begin{bmatrix}2&1&0\\1&0&-1\\0&-1&-2\end{bmatrix}}}
523:{\displaystyle {\text{North West:}}{\begin{bmatrix}0&1&2\\-1&0&1\\-2&-1&0\end{bmatrix}}}
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802:{\displaystyle {\text{South:}}{\begin{bmatrix}1&0&-1\\2&0&-2\\1&0&-1\end{bmatrix}}}
430:{\displaystyle {\text{North:}}{\begin{bmatrix}-1&0&1\\-2&0&2\\-1&0&1\end{bmatrix}}}
988:{\displaystyle {\text{East:}}{\begin{bmatrix}-1&-2&-1\\0&0&0\\1&2&1\end{bmatrix}}}
616:{\displaystyle {\text{West:}}{\begin{bmatrix}1&2&1\\0&0&0\\-1&-2&-1\end{bmatrix}}}
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The
Robinson compass mask is defined by taking a single mask and rotating it to form eight orientations:
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Systems and
Computing, vol 340. Springer, New Delhi
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1241:Feature detection (computer vision)
204:Affine invariant feature detection
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142:Maximally stable extremal regions
99:Hessian feature strength measures
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137:Determinant of Hessian (DoH)
132:Difference of Gaussians (DoG)
196:Generalized structure tensor
175:Generalized Hough transform
127:Laplacian of Gaussian (LoG)
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1170:Robinson NorthEast Mask
1154:Robinson SouthEast Mask
1138:Robinson SouthWest Mask
1122:Robinson NorthWest Mask
212:Affine shape adaptation
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94:Level curve curvature
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1114:Robinson North Mask
230:Feature description
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183:Structure tensor
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46:Differential
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817:South East:
631:South West:
445:North West:
262:Scale space
1235:Categories
1175:References
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331:used for
281:Pyramids
61:Robinson
1095:Example
56:Prewitt
41:Deriche
1224:(2010)
1220:
724:South:
352:North:
1207:2017.
910:East:
538:West:
104:SUSAN
51:Sobel
36:Canny
1218:ISBN
323:, a
248:GLOH
243:SURF
238:SIFT
147:PCBR
109:FAST
319:In
253:HOG
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.