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DataHidingforVideo-inVideo1.ppt

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Transcript

  • 1. Data Hiding for Video-in Video by : Mitchell Swanson, Bin Zhu and Ahmed Tewfik Summarized By : Pritam Potnis
  • 2. What did they Suggest ??
    • A scheme for hiding high bit-rate supplementary data, such as secondary video, into a digital video stream by directly modifying the pixels in the video frames.
      • The technique requires no separate channel or bit interleaving to transmit the extra information.
      • The data is invisibly embedded using a perception based projection and quantization algorithm.
      • The Data Hiding algorithm supports user defined levels of accessibility and security.
      • Algorithm is illustrated by using Real Time Video-in-Video and Speech-in-Video examples.
      • Also demonstrates the robustness of data hiding procedure to video degradation and distortions.
  • 3. Highlights ……
    • Hidden Data remains intact as the host video is compressed, stored and transmitted.
    • The Embedded data can be extracted from the video stream automatically or when the user selects a particular temporal/spatial region.
    • The embedded data is invisible within the host media
    • Hiding data directly into the video data, resolves the problems like synchronization, during playback and additional storage.
    • Hiding information in spatial or temporal regions lets the data remain in these regions if they are removed and pasted into another location.
  • 4. Diagram of Video Data Hiding Algorithm
  • 5. Diagram of Block Based Projection
  • 6. Diagram of Embedding Data a) Quantization of projection by masking threshold T, and b) Embedding a ‘0’ by perturbing the quantized value by –T/4
  • 7. Lets get to the Specifics……
    • The Approach is based on two steps….
      • Linear Projection
      • Quantization and Perturbation
    • Each Frame in the video sequence is broken into small blocks and transformed into the DCT Domain.
    • Each Block is projected onto a pseudo random (to generate unique author defined signatures) author defined direction.
    • The DCT of the pseudo random sequence y is computed [Zij=dct(y)]
    • The data is embedded by modifying the projection [p]
    • Projection is quantized according the masking based threshold [T=minMij]
    • The new projection p’ contains the hidden data.
    • The new image is [v’ = v + (p’-p)z
    • To Extract Data the receiver projects v’ onto z (z is computed from x by authorized receivers), removes the integer portion of the projection, and evaluates the remainder
        • b = 1 If [< v’, z > -{< v’, z >} ] > 0
        • b = 0 otherwise
    • The original image block v is not required to extract the embedded data
    • One or more bits per block can be inserted by projecting the block onto multiple directions.
  • 8. Video-in-Video Application
    • Original Broadcast News Video (b) Broadcast News Video with Embedded
    • Madonna Video.
    • The Madonna Video is the Real -Time Video
  • 9. What’s Happening in the Video-in-Video Application
    • A 311 frame, 120 x 160 grayscale video of Madonna  video is embedded in an equal length sequence from another movie.
    • The Madonna video is embedded for real time playback along with the host video.
    • The Madonna video is encoded using MPEG at a bit rate of 294 bytes/frame
    • The frames of the Broadcast News Video are of size 240 x 360
    • No degradations of the video sequences are visible
    “ Unlike PIP, no separate data streams for each video are transmitted for this procedure. Only host video stream is transmitted and the embedded video stream is extracted and displayed in a window within the host video, streamed to a second display device”
  • 10. Speech-in-Video Application
    • Original Classroom Sequence (b) Classroom Sequence with Hidden Data
    • Four Embedded Speech Signals
  • 11. What’s Happening in the Speech-in-Video Application ???
    • Speech is also supported by this algorithm.
      • Four speech streams are embedded and played back in real time.
      • Video: 250 frames (Size: 360 x 240) Original Speech Stream: 8KHz
      • A Code Excited Linear Predication (CELP) voice compression algorithm is applied to each speech signal
      • Resultant compressed waveforms are coded at 2400 bits per second.
    • In this way the Classroom Video can be transmitted with four language options for a multilingual audience.
  • 12. This Technology ……
    • Can be used to enhance video watching experience by giving viewers the capability to control and personalize what they view.
    • Can be used for interactive digital TV or Video-in-Video without a separate channel.
    • Can use private author keys, allowing only privileged users to access the data.
    • Employs a masking model to guarantee the hidden data is invisible and maximizes the strength of the hidden data
  • 13. THANK YOU !!!!