Kim. Baek, Lee, Suh's Robust Image Watermark Using Radon Transform and Bispectrum PDF

By Kim. Baek, Lee, Suh

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The receiving application will most likely throw this RS-232 data packet (and any similar to this that follow) in the trash. PicBasic Pro’s bit inversion option is used to avoid situations like the one we just discussed that stem from not having an RS-232 converter IC at one end of the link. As you can see, the bit inversion takes the place of an RS232 converter IC and allows direct connection to a “true” serial port. Although you can hook raw microcontroller port I/O pins directly to an RS-232 port, be careful as the RS-232 voltages will damage your microcontroller.

Equating a ‘1’ to a bit allows the program represented by that bit to be compiled. Conversely, a ‘0’ assigned to a bit effectively turns that program off to the compiler. Normally, this kind of code would not be something you’d want to include in a professional project. I’m incorporating it here to make the PicBasic Pro Compiler serial communications example easier for you to understand and compile by stuffing two programs into one as we did with the Custom Computer Services C Compiler C source.

The same is true for the transmit circuit, which is driven using Q2, R4 and R5. If the RS-232 cable is not too long and is of a high quality, Q2 will send a “dirty” mark (0 VDC instead of –3 VDC or better) when it is turned on by the PIC12F675’s transmit pin, GP2. A clean space will be transmitted when Q2 is off. 2 is a cheap and easy way to implement an RS-232 link. Writing Some Simple RS-232 Firmware No matter which direction you took, “dirty” PICkit 1 or homebrew “formal,” I’m sure you’ll agree that the RS-232 hardware was easy to obtain and assemble.

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Robust Image Watermark Using Radon Transform and Bispectrum Invariants by Kim. Baek, Lee, Suh


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