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    Foveon X3 Technology In-Depth
    Author: David Pitlyuk
    Date Posted: April 10th, 2002
    Pages: 1 2 3 4 5 6
    >> Discuss This Article

    The F7 Image Sensor

    Here are the features and specs on the F7 image sensor which uses X3 technology:

    Features

    Foveon® X3™ Pixels

    • Three photodetectors are layered to achieve full-measured color in each pixel.
    • Images have improved sharpness and immunity to color sampling artifacts such as moiré patterns.
    • In contrast to color filter arrays that use light-absorbing filters, the X3 technology converts light of all colors into useful signal information at every pixel location.

    Variable Pixel Size (VPS)

    • Several neighboring pixels can be grouped together on-chip to obtain the effect of a larger pixel.
    • Enables flexible video capture at a variety of resolutions.
    • Enables higher-ISO mode at lower resolutions without sacrificing low-noise performance.

    Ultra Low Power

    • Use of the most advanced CMOS process technology allows for ultra low power.
    • Input voltages to the sensor are less than 2.5 V.
    • Power consumption is less than 50mW during readout, less than 10mW in standby mode, and less than 100µW in power down mode.

    Low noise

    • Foveon has pioneered the use of CMOS sensors for high-quality image capture.
    • The Foveon X3 image sensor offers extremely low-noise readout and very high dynamic range.
    • Proprietary readout circuits eliminate many of the fixed pattern noise artifacts commonly associated with CMOS image sensors.

    Blooming Community

    • The Foveon X3 image sensor has substantially greater resistance to the blooming that is characteristic of CCD image sensors.

    Specs

    Total Pixels 2304 x1536 x 3 Format of X3 pixels within the array
    Effective Pixels 2268 x1512 x 3 Format of optically active X3 pixels
    Effective Photo Detectors 10.3 million Total number of measured color data points captured by image sensor
    Pixel Pitch 9.12µm Center-to-center spacing of X3 pixels
    Effective Area 20.7mm x 13.8mm  
    Effective Diagonal 25mm  
    Aspect Ratio 3:2  
    ISO 100 Full resolution mode
    Frame Rate 2FPS for Full Array;
    25FPS for 576 x 384 Resolution (VPS)
    Maximum number of frames per second in the rolling shutter mode
    Variable Pixel Size Increments Powers of 2, independently in each direction Number of X3 pixels of one color to average together for output

    The F10 Image Sensor Go the the next page
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    1. Introduction/Mosaic Capture Vs. X3 Capture
    2. Variable Pixel Size
    3. The X3 Image Sensor
    4. The F7 Image Sensor
    5. The F10 Image Sensor
    6. Conclusion

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