This thesis is composed of three main parts / displaying an analog composite video input by
via converting to digital VGA format, license plate localization on a video image and image
enhancement on FPGA.
Analog composite video input, either PAL or NTSC is decoded on a video decoder board / then on FPGA, video data is converted from 4:2:2 YCbCr format to RGB. To display RGB
data on the screen, line doubling de-interlacing algorithm is used since it is efficient
considering computational complexity and timing.
When taking timing efficiency into account, image enhancement is applied only to beneficial
part of the image. In this thesis work, beneficial part of the image is considered as numbered
plates. Before image enhancement process, the location of the plate on the image must be
found.
In order to find the location of plate, a successful method, edge finding is used. It is based on
the idea that the plate is found on the rows, where the brightness variation is largest. Because
of its fast execution, band-pass filtering with finite response (FIR) is used for highlighting the
high contrast areas.
Image enhancement with rank order filter method is chosen to remove the noise on the image.
Median filter, a rank order filter, is designed and simulated. To improve image quality while
reducing the process time, the filter is applied only to the part of the image where the plate is.
Design and simulation is done using hardware design language VHDL. Implementations of
the chosen approaches are done on MATLAB and Xilinx Virtex-2 Pro FPGA. Improvement
of the implementation considering speed and area is evaluated.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611448/index.pdf |
| Date | 01 January 2010 |
| Creators | Gunay, Hazan |
| Contributors | Askar, Murat |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
Page generated in 0.002 seconds