Wide Field of View (WFoV) ITS-in-a-Box Assembly

Android 9 introduces ITS-in-a-box revision 2, an automated test system for both wide field of view (WFoV) and regular field of view (RFoV) camera systems in the Camera Image Test Suite (ITS). Revision 1 was designed to test mobile device cameras with an FoV less than 90 degrees (RFoV). Revision 2 is designed to also test cameras that have an FoV greater 90 degrees (WFoV), enabling you to use one ITS-in-a-box system to test different cameras with varying FoVs.

The ITS-in-a-box system consists of a plastic box laser cut from computer-aided design (CAD) drawings, an internal lighting system, a chart tablet, and a device under test (DUT). You can purchase an ITS-in-a-box or build your own.

Purchasing a WFoV ITS-in-a-box

We recommend purchasing a WFoV ITS-in-a-box from one of the following qualified vendors.

  • Acu Spec, Inc.
    990 Richard Ave, Ste 103, Santa Clara, CA 95050
    fred@acuspecinc.com
  • MYWAY, Inc
    4F., No. 163, Fu Ying Rd., New Taipei City, Taiwan
    sales@myway.tw

Building a WFoV ITS-in-a-box

This section includes step-by-step instructions for assembling a WFoV ITS-in-a-box (revision 2) that can test cameras with a wide field of view (greater than 90 degrees).

Overview

The WFoV ITS-in-a-box consists of a device under test (DUT), a chart tablet, an internal lighting system, and a plastic box that is laser cut from CAD drawings (shown in Figure 1).

CAD drawing of WFOV ITS-in-a-box

Figure 1. Mechanical drawing of WFoV ITS-in-a-box

Required tools

To get started, download the latest technical drawings for the WFoV ITS-in-a-box, cut the plastic and vinyl pieces, purchase the hardware from the bill of materials (BOM), and gather these tools:

  • Phillips head screwdriver
  • Pliers
  • Wire cutters
  • Scissors
  • Water spray bottle
  • X-acto knife

Step 1: Apply colored vinyl

To apply colored vinyl:

  1. Apply colored vinyl on the smooth side of the acrylonitrile butadiene styrene (ABS) and cut out the necessary openings as shown in Figure 1. Make sure to apply the white vinyl with the large rectangular opening on the tablet side and the black vinyl with the circular opening on the mobile device side of the box. For more information, see wikiHow.

    ABS pieces with vinyl applied on the smooth side

    Figure 2. ABS pieces with vinyl applied on the smooth side (interior of the box)

Step 2: Assemble and install the light rail

To assemble and install the light frame structure with LED light strips:

  1. Review the mechanical drawing of the light frame structure.

    Light frame structure with LED light strips

    Figure 3. Light frame structure with LED light strips

  2. Gather the plastic light baffles, light mounts, LED light strip, and zip ties.

    Light baffles, light mounts, LED light strips, and zip ties

    Figure 4. Light baffles, light mounts, LED light strips, and zip ties

  3. Snap the plastic light baffles to the light mounts as shown in figure 5. This should be a tight fit.

    Plastic light baffles fitted in light mounts

    Figure 5. Plastic light baffles fitted in light mounts

  4. Snap the light mounts to the side panels as shown in figure 6. When complete, the light will shine towards the front corners of the box interior.

    Light baffles and mounts snapped onto the side panels

    Figure 6. Light baffles and mounts snapped onto the side panels

  5. Assemble the side panels. (Optional: Sand the edges of the baffles for a better fit.)

    Side panels assembled and screwed in

    Figure 7. Side panels assembled and screwed together

  6. Wrap the LED strip on the side facing the panel, between the holes used for fastening. (Optional: Use the tape on the back of the LED light strip for easier wrapping.)

    LED light strip wrapped around the baffles

    Figure 8. LED light strip wrapped around the baffles

  7. Wrap the light strips around the baffles twice, use zip ties to tie down the strip, and snap the ends together.

    Zip ties holding the LED light strips in place

    Figure 9. Zip ties holding the LED light strips in place

    LED lights wrapped around the baffles

    Figure 10. LED lights wrapped around the baffles twice and exiting through side exit

    Zip ties showing on the side facing up

    Figure 11. Zip ties showing on the side facing up. LED strips are on the other side.

Step 3: Assemble tablet and phone mounts

To assemble the tablet and phone mounts:

  1. Review the mechanical drawing of the tablet mount.

    Mechanical drawing of tablet mount

    Figure 12. Mechanical drawing of tablet mount

  2. Gather the parts as shown in figure 13.

    Tablet and phone mount parts

    Figure 13. Tablet and phone mounts with screws, plungers, vinyl caps, and nuts

  3. Cut the push-on vinyl cap by ⅓ of its length and push it onto the end of the plunger. This ensures the plunger mechanism can be retracted and locked.

    Plunger with adjusted push-on cap

    Figure 14. Plunger with adjusted push-on cap

  4. Screw the plungers onto the mounts.

    Tablet and phone mounts with plungers attached

    Figure 15. Tablet and phone mounts with plungers attached

Step 4: Final assembly

To assemble the WFoV ITS box:

  1. Gather the front aperture plates and screw the smaller plate with the square on top of the larger plate as shown in figure 16.

    Assembled aperture plates

    Figure 16. Front aperture plates screwed together with 4-40 screws

  2. Tape the front and back panels to the rest of the box.

    WFoV box with sides screwed together

    Figure 17. WFoV box with sides screwed together and the front and back panels taped

  3. Check that the power adapter is 12V, 5A. Anything below 12V will not work; anything below 5A may affect the brightness level of the lights.

    12V, 5A power adapter

    Figure 18. 12V, 5A power adapter

  4. Using a digital lux tester, test the lux of the LED lights to make sure they are at the appropriate level. The YF-1065 by Contempo Views is used in this example.

    YF-1065 by Contempo Views

    Figure 19. YF-1065 by Contempo Views

  5. Place the light meter on the tablet side and turn it to 2000 lux to measure the light. The lux should be around 100 to 130. Anything significantly lower will be too dim for the tests and can lead to test failures.

    Lux meter

    Figure 20. Lux meter measuring light from the side with tablet mount

  6. Follow the appropriate step depending on the lux value measured:

    • If the light is at the correct level, screw the front and back plates into place.
    • If the light is not at the correct level, check the LED and power supply part number.
  7. Mount the phone mount on the aperture plate and the tablet mount on the opposite side with screws and nuts.

    Phone mount and tablet mount

    Figure 21. Phone mount (left) and tablet mount (right)

    Assembled WFoV box

    Figure 22. Assembled WFoV box: rear view (left) and front view (right)

Revision history

The following describes the changes made to the WFoV ITS-in-a-box.

Revision 2.7

  • Switched light in the BOM (#16) to UL listed LED tape for better manufacturing consistency.
  • Switched power supply in the BOM (#17) to the same source as #16.
  • Revised the tablet mount to be 35mm wider to match the tablet opening (page 4 on mechanical drawing)
  • Revised the front clamp hole spacing (distance) to align with the clamp slot length (page 5 on mechanical drawing)
  • Reduced the front aperture circle diameter by 20mm to match the RFoV ITS-in-a-box (revision 1) (page 5 on mechanical drawing)

Revision 2.6 (released internally)

  • Made a correction to the mechanical drawing

Revision 2.5

  • Simplified tablet holder to be similar to the phone mount
  • Used a sandblast finish instead of an anodized finish to reduce costs
  • Corrected specifications for LED lights on the BOM

Revision 2.4

  • Switched from acrylic to ABS material to reduce shipping damage
  • Removed 3D printing elements and replaced them with laser-cut ABS to reduce costs
  • Changed the box handles to use ABS instead of being a separate item to purchase on the BOM