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Super Fast Camera System Performed by: Tokman Niv Levenbroun Guy Supervised by: Leonid Boudniak.

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Presentation on theme: "Super Fast Camera System Performed by: Tokman Niv Levenbroun Guy Supervised by: Leonid Boudniak."— Presentation transcript:

1 Super Fast Camera System Performed by: Tokman Niv Levenbroun Guy Supervised by: Leonid Boudniak

2  The concept: combine multiple “off the shelf” cameras, to create a sequence of frames to capture a fast moving object.  An FPGA will be used to coordinate and synchronize the cameras.  The image data will be read into a computer, where it will be processed. Project Overview

3  Choose an appropriate image sensor, to fit our goals. We found two appropriate sensors. In order to use the sensors, a creation of a complex PCB (printed circuit board) is required. To carry on with the rest of the project, a camera module was found as well, that doesn’t fit the project definitions, but close enough. Project Goals

4 Camera Module PhotonFocus OEM-D640C-66Model 40us-1.3msShutter time Amplifiers, ADCOn-chip features Digital, 8 bit/pixel Output type 640x480Resolution  Remarks: No Readout control is possible ! 

5  Design a controller to operate a single and two sensors. In the presentation we will focus on this subject. Project Goals

6  Most image sensors/Camera modules operate at 33MHz~66MHz Pixel rate  Without a specific camera, we’ll assume a 33 MHz pixel rate from the camera, 8 bit per pixel => 33 Mbyte/sec  In case of N cameras sending data in parallel, effective input data rate to the system is 33*N Mbyte/sec. N=2 => 66 Mbyte/sec System Data Rates

7  Use a NallaTech board PCI interface allows direct connection to PC. No onboard memory. Allows user external circuit connection  Drawbacks: No memory onboard requires real-time data transfer from the cameras via the PCI to the PC. PCI peak rate is 132 Mbyte/sec. But when considering bus load and protocol timing, 66Mbyte/sec becomes problematic. Design is limited to 2 cameras max. Implementation Possibilities

8  Use the memec design virtex2 pro ™ board The p160 expansion card enable us to connect multiple cameras. On board memory (32 MByte sdram). PC connection via USB or RS-232 Offers more flexibility through embedded CPU.  Drawbacks: Limited accessibility to the board.

9 Implementation Possibilities  Conclusion: NallaTech’s board offers limited design options and low bandwidth. Extensions to the design to support more than a few cameras is not possible. We chose the Memec Design development board as our implementation environment.

10 Implementation approach  No simple SDRAM controller core is available. Implementing one is complex and time consuming.  There is an SDRAM controller with PLB/OPB bus interface, allowing us to use it but requires that our system will also have a bus interface.  Using PPC to access the memory has high overhead, hence lower bandwidth.  By using the DMA option of the bus interface, data flows at maximum speed.

11 Implementation approach  SDRAM data width is 32 bit.  From each camera, we’ll pack 3 pixels (3 bytes), and the forth will contain camera number and packet number.  32 bit bus data rate:

12 System Block Diagram 1 - integration2 – data storage3 – data readout

13 Stage 1 - Integration  The Controller signals each camera in turn to start integration, using the camera interface.  Each camera interface is responsible for generating appropriate signals and timing

14 Stage 2 – Read Out  Each camera send data to a dedicated FIFO.  An arbiter selects each camera in turn to send a packet of 3 bytes + 1 byte header to the main FIFO.  Using the PLB bus interface and DMA options, the main FIFO sends the packets to the SDRAM.

15 Stage 3 – Data Transfer  After the images are stored in memory, the data is read from the SDRAM and sent to the PC via RS-232 (or USB).  We consider using the PPC for that task.

16 System Block Diagram

17 Milestones  We need a board to work on.  Design a simple test bench to test and understand DMA operation.  Design and implement a FIFO with DMA capabilities, and test it against a stream of data at 66 Mbyte/sec.  Complete the Integration and Readout Timer/controller.  Enable sdram readout to PC through RS-232 (or USB). Consider using PPC.

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