3.1 A framework for video processing with the dm6437 dvdp

Introduction

This chapter describes general procedures for reading and writing video streamss. The scripts and models created in this chapter will be the basis for the other video processing chapters.

Hardware and software requirements

This laboratory was originally developed using the following hardware and software:

• MATLAB® R2008a
• Code Composer Studio (CCS) v3.3
• Texas Instruments DM6437 Digital Video Development Platform (DVDP) .
• Video camera and screen.

Related files

• Simulink Model for Simulation - Video_sim.mdl
• Input Video File - vipmem_Y.avi
• Simulink Model for Real-Time Video Processing with a Camera- Video_R_W.mdl
• MATLAB script for Real-Time TCP/IP Interface - RW_tcpip_script.m
• Simulink Model for Real-Time Video Processing through the TCP/IP Interface - RW_dm6437_tcpip.mdl
• Simulink Model for PC Control of Real-Time Video Processing through the TCP/IP Interface - RW_pcl_tcpip.mdl

Simulation

Start by creating a new model in Simulink®.

1. Open the Simulink library browser and add the "From Multimedia File" from the "Sources" group of the Video and Image Processing Blockset (Please refer to Figure 1).

2. Double Click and select the “vipmem_Y.avi” input file(Please refer to Figure 2).

3. In order to display the picture the "Video Viewer" from the "Sinks" group of the Video and Image Processing Blockset will be used.

4. Connect the three blocks as shown in Figure 5.

5. Run the model, you should see the video clip. A single frame is shown mage shown in Figure 6.

6. Save your model (We used the name “Video_sim.mdl", that you may find it here ).

Real-time processing with the dm6437 dvdp

Using a camera and a display

The procedure for capture/display video using the DM6437 is shown in Figure 7.

Ccs code generation

This procedure is similar to the one developed for stills pictures. Video will be capture/display using a camera and a monitor. Image acquisition and Processing will run in a DSP/BIOS task.

1. Open the “stills_R_W.mdl”
2. Delete the “From RTDX” and “To RTDX” blocks
3. Add the "Task" block from the "DSP/BIOS library" group of the "Target Support Package TC6" Blockset.
4. Add the “Function- Call Subsystem” from the “Ports&Subsystems" group of the "Simulink" Blockset (Please refer to Figure 8).

5. Rename “Function- Call Subsystem” to “Video Processing” and connect it to the “Task” block.
6. Save the model as “Video_R_W.mdl”. Your model should look as follows You may add a title to the model, as done here ( ”Video Processing Template”) :

7. Double-click the “Task” block and make the same changes as shown in Figure 34.

8. Double-click the “Video Processing” block. A new window will be opened.
9. In the new window, add the "Video Capture" and "Video Display" from the "DM6437 EVM Board Support" group of the ""Target Support Package TC6" Blockset as shown in Figure 11.

10. Double-click the “Video Capture” block and change the Sample Time (and the Video capture mode only if you are using the components in the PAL mode) as shown in Figure 12.

11. Double-click the “Video Display” block and change the Video capture mode only if you are using the components in the PAL If the camera video capture mode is NTSC you should choose this option mode as shown in Figure 13.

12. Connect the blocks as shown in Figure 14.

13. Generate code&create project. Double-click the " Generate code&.." block.
14. Build the project. Double-click the “Build Project” block.
15. Load the project. Double-click the “Load Project” block.
16. Run the target. Double-click the “Run” block. This model can be found here .