SLIC stands for simple linear iterating clustering, a special case of k-mean clustering adapting to generate superpixel. SLIC provides the advantage in image segmentation in terms of outling edges and computing speed.
Fast radial symmetry transform, developed by Loy et la., has potential in a variety of application in computer vision. It works toward to targeting nuclei in a given image. Once the nuclei are found, they can be further segmented using watershed transformation.
We found out that iteraing SLIC algorithm twice is more efficient than using fast radial symmetry transform, which cannot detect individual nucleus among cluster.
Nonetheless, the repeating SLIC implementaion is not perfect. There is difficuilty in cleaning up final images to get rid of small pixels that contain no useful imformation. I am putting further effort to achieve better results using several superpixel properties, such as intensity, area, and concavity
Loy, Gareth, and Alexander Zelinsky. "Fast Radial Symmetry for Detecting Points of Interest." IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 25.8 (2003). Print.
Achanta, Radhakrishna, Appu Shaji, Kevin Smith, Aurelien Lucchi, and Pascal Fua. "SLIC Superpixels." EPFL Technical Report 149300 . Print.
We approach the digital design by separating the system into smaller parts with one state machine controlling several modules as shown in the schematic. Each module was coded by Verilog and then they were connected using Xilinx.
Since our display could be cleanly separated from the digital logics, we decided to work on the VGA programming in a separate module. We again broke the task into smaller parts. The Letter module takes in the ASCII code for a lower case letter and outputs the RBG values for that letter. The position of the letter is controlled by pX and pY which represents the reference point at the top left corner of the letter. Every part of the letter is coded as pX + xDistance and pY + yDistance away from the reference point. By doing this, we can move the entire letter by changing pX and pY.