Deinterlacer Using Bob Mode
This design example shows how to convert interlaced video into a non-interlaced format in DSP Builder. Interlaced video is composed of a sequence of fields and must be converted to a sequence of frames before display in certain applications.
The Altera® Deinterlacer MegaCore® function supports two deinterlacing methods: bob and weave. Unlike weave deinterlacer, bob deinterlacer simply drops every other field temporally and interpolates the current field spatially to fill the missing lines. The bob deinterlaced frames are more blurry, although less jagged, compared to the weave deinterlaced frames. The Altera Deinterlacer MegaCore function performs bob deinterlacing by either duplicating the current fields or interpolating current fields linearly. In this example with bob deinterlacing, the Deinterlacer MegaCore function averages the line above and below to fill the entire frame.
The model consists of an image stream source block, a deinterlacer_bob block, and an image stream sink block. The image stream source block reads the input binary file and feeds the data stream to the deinterlacer_bob block. The image stream sink block writes the deinterlaced data stream to an output binary file. The package also includes the utility to convert an avi video file format to and from a binary file format.
Download the files used in this example:
The use of this design is governed by, and subject to, the terms and conditions of the Altera Hardware Reference Design License Agreement.
Files in the zip download include:
- example.mdl - DSP Builder design file
- deinterlacer_bob.vhd - Wrapper file to generate the Deinterlacer intellectual property (IP) MegaCore function
- avi-is-avi.exe - DOS executable to convert an avi file to and from a binary file
Figure 1 shows the top-level diagram of the Deinterlacer MegaCore function using the bob mode design example in DSP Builder.
Figure 1. Deinterlacer Using Bob Mode Design Example
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Table 1 lists the ports and gives a description for each.
| Table 1. Deinterlacer Using Bob Mode Port Listing |
| Port Name |
Type |
Description |
din_data[7:0] |
Input |
Data input bus |
din_valid |
Input |
Data valid signal that indicates the validity of the input data signals |
dout_ready |
Input |
Data output ready signal |
reset |
Input |
Reset signal |
din_ready |
Output |
Data input ready signal |
dout_data[7:0] |
Output |
Data output bus |
dout_valid |
Output |
Data valid signal that indicates the validity of the output data signals |
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These design examples may only be used within Altera Corporation devices and remain the property of Altera. They are being provided on an “as-is” basis and as an accommodation; therefore, all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Altera expressly does not recommend, suggest, or require that these examples be used in combination with any other product not provided by Altera.
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