SnapshotProjectDisplayDisplayDisplayDisplayStorageBlock DiagramImage CompressionImage CompressionPossible AdditionsQuestions?SnapshotMike HuhsSanjay JhaveriProject Digital Camera User Interface Compression and StorageCourtesy flickr users la_salebete and smet_dk. Used with permission.DisplayCamera VideoCaptureLive VideoShoot ButtonCursorLast PictureCourtesy flickr user christinatinarobinson. Used with permission.DisplayCamera VideoCaptureClick!Courtesy flickr user christinatinarobinson. Used with permission.DisplayCaptureCourtesy flickr user christinatinarobinson. Used with permission.DisplayCaptureLive VideoCourtesy flickr user christinatinarobinson. Used with permission.StorageZBT Ram 1 ZBT Ram 2Click!Compression Your PictureRow, Column = AddressCourtesy flickr users la_salebete and smet_dk. Used with permission.Block DiagramA/DRAMImage CompressionNTSC DecodeWrite ControlRead ControlControlXVGARGB ConvertMouseNTSCYCrCbData, AddressDataAddressRGBline, columnXvga signalsYCrCbImageControlsCompressed ImageControlsUser InputsCourtesy flickr users la_salebete and smet_dk.Image from Wikimedia Commons, http://commons.wikimedia.org .Used with permission. Used with permission.Image Compression• 2D Discrete Cosine Transform: decomposes image into frequency components• Apply 1D transform to rows and then to columns• Separately transform 8 x 8 blocks of image• Eye acts as natural low pass filter • Only store low frequency components of image1D DCT 1D DCTTranspose8x8 Input Matrix 8x8 Transform Matrix8 x 8 pixels180 150 23 12 5 2 1 2130 125 54 22 8 3 5 489 77 45 19 4 2 0 345 33 21 15 8 4 3 122 9 12 5 1 2 5 017 13 7 10 8 6 2 28 3 4 6 2 1 3 05 2 8 3 1 2 5 0Image CompressiondctdctdctidctidctidctZBT RAMDCT & Memory Controldata_out validdata_outdata_indata_in validFrom read moduleget pictureFrom controldelete pictureTo read module ZBT Ram can store ~ 5-6 picturesPossible Additions Visual effects such as zoom, rotate, and blur Watermarked symbol that appears after processing the
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