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LINKRUNCCA: A Linked List Run-Length-Based Single-Pass Connected Component Analysis
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======================================================================================================
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Description
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-----------
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LinkRunCCA is a real-time single-pass connected component analysis/labelling (CCA/CCL) hardware implementation in verilog HDL. It can operate in maximum streaming throughput (one pixel per cycle) and has very low memory requirement. The implementation is based on the state-of-the-art algorithm from publication in http://dx.doi.org/10.1007/s11554-016-0590-2.
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LinkRunCCA uses combination of linked list and run-length-based techniques to label and extract components' feature (bounding box in this case) in one scan. Algorithm detail is described in the publication.
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Overview of LinkRunCCA
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______________
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pixel---->| |---->bounding box (min X, max X, min Y and max Y coordinates)
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| LinkRunCCA |
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valid---->| |---->valid_out
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|______________|
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Input Ports:
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clk - clock sink
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rst - reset sink
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pix_in - input binary image/video stream (1 bit)
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datavalid - valid bit for input stream
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Output Ports:
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box_out - bounding box of each component (concatenated min X, max X, min Y and max Y coordinates)
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datavalid_out - valid bit for each bounding box
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Parameters:
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imwidth - image width
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imheight - image height
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Using LinkRunCCA
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LinkRunCCA accepts binary image/video stream as input and produces bounding boxes of each connected component in the image/video. It can be connected directly to any streaming interfaces up to one pixel per cycle throughput, consisting of a data bit (binary pixel) and a valid bit. Bounding box of each connected component is produced immediately as soon as the component is completed, accompanied with a valid_out bit.
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The size of image/video is parametrizable, hence the memory requirement is varied based on image/video size. The parameters (imwidth and imheight) must be set correctly according to the image size for implementation.
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Authors and Contact Details
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Author: J.W. Tang
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Email: jaytang1987@hotmail.com
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Citation
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--------
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By using LinkRunCCA in any or associated publication, you agree to cite it as:
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Tang, J. W., et al. "A linked list run-length-based single-pass connected component analysis for real-time embedded hardware." Journal of Real-Time Image Processing: 1-19. 2016. doi:10.1007/s11554-016-0590-2.
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Copyright (C) 2016 J.W. Tang
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----------------------------
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LinkRunCCA is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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LinkRunCCA is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LinkRunCCA. If not, see .
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