Steganography Using Fourier Transform and Zero-Padding Aliasing Properties

Steganography technique utilizing Fourier Transform and zero-padding aliasing properties for secure information hiding. The study explores Nyquist rate, padding effects, and DFT characteristics, demonstrating effective data retrieval with minimal error margin. Results suggest high data recovery rates and minimal distortion. The conclusion highlights the significance of DFT and zero-padding in secure data transmission. Relevant references from the field of digital image processing are also provided.

• Steganography
• Fourier Transform
• Zero-Padding
• Data Retrieval
• Digital Image Processing

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Uploaded on Apr 12, 2025 | 0 Views

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Presentation Transcript

1. Serial read problem

2. Digitlis homokra

3. Digitlis homokra https://people.vts.su.ac.rs/~pmiki/_DALJINSKA_NASTAVA_MIKROKONTROLERI/28.04/ pescanikReal.mp4 https://people.vts.su.ac.rs/~pmiki/_DALJINSKA_NASTAVA_MIKROKONTROLERI/28.04/ pescanik.mp4

4. Tilt switch https://people.vts.su.ac.rs/~pmiki/_DALJINSKA_NASTAVA_MIKROKONTROLERI/28.04/ tilt.mp4

5. Tilt switch void setup() { pinMode(3, INPUT); pinMode(5, OUTPUT); Serial.begin(9600); } void loop() { int sensorValue = digitalRead(3); if (sensorValue == 1){ digitalWrite(5, HIGH); } else{ digitalWrite(5, LOW); } Serial.println(sensorValue); delay(500); }

6. Megszaktsok (interruptok)

7. Megszaktsok Polling (mailbox example) Szoftveres (timer) Hardveres (k ls hat s id zi ket el , pl. gombnyom s) Arduino Uno (digit lis l b 2, 3)

8. Szoftveres megszakts #include <TimerOne.h> String LEDStatus = "OFF"; int RedLED = 9; int YellowLED = 10; void setup() { pinMode(YellowLED, OUTPUT); pinMode(RedLED, OUTPUT); Timer1.initialize(1000000); Timer1.attachInterrupt(BlinkYellow); Serial.begin(9600); } https://people.vts.su.ac.rs/~pmiki/_DALJINSKA_NASTAVA_MIKROKONTROLERI/28.04/ intBlink.mp4

9. Szoftveres megszakts void loop() { digitalWrite(RedLED, HIGH); delay(250); digitalWrite(RedLED, LOW); delay(250); } void BlinkYellow(){ if(LEDStatus=="ON"){ digitalWrite(YellowLED, LOW); LEDStatus="OFF"; return; } if(LEDStatus=="OFF"){ digitalWrite(YellowLED, HIGH); LEDStatus="ON"; return; } }

10. Hardveres megszakts volatile boolean ledOn = false; void setup() { pinMode(13, OUTPUT); pinMode(2, INPUT); attachInterrupt(digitalPinToInterrupt(2), buttonPressed, RISING); } void loop() { } void buttonPressed(){ if(ledOn){ ledOn = false; digitalWrite(13, LOW); } else{ ledOn = true; digitalWrite(13, HIGH); } } https://people.vts.su.ac.rs/~pmiki/_DALJINSKA_NA STAVA_MIKROKONTROLERI/28.04/pressButton.mp4