Manual JAI AD-081

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  • JAI AD-081 - page 1

    T ech Note TN-0902 Date: 02/06/09 USING A 2CCD CAMERA T O CREA TE HIGH-DYNAMIC RANGE IMAGES Some imaging scenarios push dynamic range beyond the capabilities of the typical sensor . This is especially true where incident light is present (e.g., imaging a light source and the surrounding area). This can also occur in situations with bright reecti ...

  • JAI AD-081 - page 2

    T ech Note 2 NO. TN-0902 pg 2 Example 1 - Maximum Dynamic Range (no overlap) T o create an image that spans the maximum range of light intensities, use shutter settings to calibrate the 2 sensors so that Sensor B = Sensor A * 1024. In other words, the light needed to generate 100 counts from Sen - sor B is 1024 times the light needed to create 100 ...

  • JAI AD-081 - page 3

    T ech Note 2 Displaying a high dynamic range image on a standard monitor will require mapping the output to t the monitor’ s dynamic range capability . For the image described above, start by creating a 20-bit image map using the raw pixel data. Then create a 10-bit image map to display on the monitor by dividing the 20-bit im- age map by 1024 ...

  • JAI AD-081 - page 4

    T ech Note 2 Now , our post processing routine could be handled as follows: if (pixel B < 16){ pixel_out = pixel A }else{ pixel_out = pixel B * 64 } By overlapping the two sensor responses, this approach utilizes the full precision of the lower 10-bits while reducing the effect of noise at the transition point and greatly increasing the precisio ...

  • JAI AD-081 - page 5

    T ech Note 2 Now as Sensor A approaches its saturation point (512 – 1023 counts) the output uses the average of both sen - sors’ data to “smooth” the transition between the two sensor response graphs (see Figure 6). It still limits the use of the lowest bits on Sensor B (those that are most susceptible to noise) and keeps the calibration fa ...

  • JAI AD-081 - page 6

    T ech Note 2 For example, in a 4-bit overlap scenario, we still set the shutter for Sensor B to be roughly 64 times faster than Sensor A (i.e., a pixel on Sensor A with a value of 256 would have a value of 4 on Sensor B). But, de - pending on our objective, we apply a post processing factor of less than 64 and add an offset value to get the two out ...

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A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use JAI AD-081 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of JAI AD-081.

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