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Image Rotation

Image Rotation. Daniel E. Michek. Image Rotation Details Raster Scan Output. Choice to rotate input image or output image Hotelling transform w/ basis vectors cos(t) and sin(t) Rotate input image (raster scan order data output) Sx = Dx*cos(t) + Dy*sin(t), Sy = Dy*cos(t) - Dx*sin(t)

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Image Rotation

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  1. Image Rotation Daniel E. Michek Xilinx Confidential

  2. Image Rotation DetailsRaster Scan Output • Choice to rotate input image or output image • Hotelling transform w/ basis vectors cos(t) and sin(t) • Rotate input image (raster scan order data output) • Sx = Dx*cos(t) + Dy*sin(t), Sy = Dy*cos(t) - Dx*sin(t) • Rotate output image (random order data output) • Dx = Sx*cos(t) - Sy*sin(t), Dy = Sy*cos(t) + Sx*sin(t) Xilinx Confidential

  3. Issues with random ordered data output • The incoming image is sent pixel by pixel to the random memory destination address. • This causes holes in the output if not over sampled. • Corners are not cleared because not all memory locations are written to with each image. Xilinx Confidential

  4. Demo Algorithm Brief • Resources -128x128 single channel 8bit • 881 Slices, 1 BRAM, 12 MULT18X18 • Uses 4x pixel speed access to memories for bilinear method with 1 frame latency • Arbitrary input from files • Automatically accommodates arbitrary file size and pixel bit precision with PreLoadFcn and StopFcn calls • Pan and Zoom incorporated • Simulation time for 128x128 image is ~8 minutes Xilinx Confidential

  5. Demo Algorithm Details • Requires 1 read memory and 1 write memory (2x image memory total) • Offset must be added to center the image • This gives an excellent opportunity to pan the image and zoom in. (Demo center and pan control) • Invalid addresses and data must be blocked • Bilinear precision allows up to 214 interpolation accuracy (27 width*27 height) with only 4 MULT18X18s Xilinx Confidential

  6. Center and Zoom • Non-centered Image • Zoomed Image (0.25) Xilinx Confidential

  7. Customer Specific Adaptations • Multi-Channel • Can take advantage of extra space in memory data width • 3 channel 12bit data fits in same memory footprint when using x33 memories • Faster memory access • Increases total memory to 8x but allow for 4 parallel reads (4x speed) • 8bit data can sit in same memory footprint when using x32 memories Xilinx Confidential

  8. 64x64 MatLab imrotate 64x64 ximrotate Qualitative Comparison Xilinx Confidential

  9. MicroBlaze MultiMedia Board Support Package • ZBT Memories mapped • ADV7185 (video input decoder) in process • Component/Svideo • Will output only valid image data • Awaiting customer specific requirements to match tokens with their proprietary board (Titan-Visicom) • ADV7194 (video output encoder) in process • Component/Svideo/VGA • RGB not planned Xilinx Confidential

  10. MBMM Board Support Package (continued) • 1 Supertoken contains bitstream allowing for use of any component, sub-tokens allow for hardware specific builds • Allows for seamless flow from System Generator/Partial HWIL to full HWIL to free running board • Download on web/~danielm • Self installing setup from m-file corrects for your install location Xilinx Confidential

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