Wide Field-of-View (WFoV) Box

Android includes 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).

The wide field-of-view box (revision 2) is designed to also test cameras that have an FoV greater than 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.
    No.228-4, Sec 4, Jen-Ai Road, Da'an District. Taiwan
    sales@myway.tw

Building a WFoV ITS-in-a-box

Instead of purchasing a WFoV ITS-in-a-box (revision 2), you may build your own. 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).

Mechanical drawings

To get started, download the latest mechanical drawings for the WFoV ITS-in-a-box.

CAD drawing of WFOV ITS-in-a-box

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

Purchase the hardware from the bill of materials (BOM). Cut the plastic and vinyl pieces.

Required tools

Have the following tools available:

  • Phillips head screwdriver
  • Needle nose pliers
  • Wire cutters
  • Scissors
  • Water spray bottle
  • X-ACTO knife

Step 1: Apply colored vinyl

To apply colored vinyl:

  1. Apply the colored vinyl on the smooth side of the acrylonitrile butadiene styrene (ABS) and cut out the necessary openings as shown in Figure 2. 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.

    Apply the gray vinyl on the side panels as shown in Figure 2 and glue the feet on the four corners of the bottom panel as shown in Figure 3.

    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)

  2. Apply the feet on the four corners of the bottom panel as shown in Figure 3.

    Bottom panel feet

    Figure 3. Feet on the four corners of the bottom panel

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 4. Light frame structure with LED light strips

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

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

    Figure 5. Light baffles and light mounts

  3. Snap the plastic light baffles to the light mounts as shown in Figure 6. This should be a tight fit.

    Plastic light baffles fitted in light mounts

    Figure 6. Plastic light baffles fitted in light mounts

  4. Snap the light mounts to the side panels as shown in Figure 7. When complete, the light shines toward the front corners of the box interior.

    Light baffles and mounts snapped onto the side panels

    Figure 7. 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 8. Side panels assembled and screwed together

  6. Secure the light baffles by squeezing the pin into the small hole on the rectangular tab that extends through the slot in the side panels as shown in Figure 9.

    Inserted PIN in LED mount tab

    Figure 9. Close up of inserted pin in LED mount tab on the outside of the box

  7. Wrap the light strips around the baffles twice on the side facing down. Use zip ties to tie down the strip, and snap the ends together. (Optional: Use the tape on the back of the LED light strip in addition to the zip ties for easier wrapping.)

    LED light strip wrapped around baffles

    Figure 10. LED light strip wrapped around the baffles with zip ties

    Zip ties holding LED light strips

    Figure 11. Zip ties holding the LED light strips in place

  8. Cut the ends of the zip ties as shown in Figure 12 and 13.

    Led lights around baffles exiting

    Figure 12. LED lights wrapped around the baffles twice and exiting through the side exit

    Zip ties facing up

    Figure 13. 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 14. Mechanical drawing of tablet mount

  2. Gather the parts as shown in Figure 15.

    Tablet and phone mount parts

    Figure 15. Tablet and phone mounts with screws, plungers, vinyl caps, and nuts

  3. Cut the rubber tips short enough to not interfere with plunger operation (roughly in half), and push them onto the ends of the plungers. The shorter vinyl cap length ensures that the plunger mechanism can be retracted and locked.

    Plungers with adjusted push-on cap

    Figure 16. Plungers with adjusted push-on caps

  4. Screw the plungers onto the mounts.

    Tablet and phone mounts with plungers attached

    Figure 17. Tablet and phone mounts with plungers attached

Step 4: Final assembly

To assemble the WFoV ITS box:

  1. Gather the front aperture plates and use 4-40 screws to screw the smaller plate with the square on top of the larger plate as shown in Figure 18.

    Fron aperture plate and phone mount plate

    Figure 18. Front aperture plate and phone mount plate

    Assembled front aperture plate

    Figure 19. Front aperture plate and phone mount plate screwed together with 4-40 screws

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

    WFoV box with sides screwed together

    Figure 20. WFoV box with sides screwed together and the front and back panels taped

  3. Use a power drill to create pilot holes based on the existing holes. Make sure that the pilot holes are big enough for 4-40 screws so that the ABS plastic doesn't crack when inserting the screws.

    Pilot holes

    Figure 21. Drilling pilot holes for 4-40 screws

  4. Screw all the panels together using 4-40 self-tapping screws.

    4-40 screws for assembly

    Figure 22. 4-40 screws for assembly

  5. Gather the handle parts shown in Figure 23.

    Handle parts

    Figure 23. Handle parts

  6. Assemble the handles as shown in Figure 24.

    Assembled handle

    Figure 24. Assembled handle

  7. Check that the power adapter is 12V, 5A and has a UL listed certificate. Anything below 12V doesn't work. Anything below 5A may affect the brightness level of the lights.

    12V, 5A power adapter

    Figure 25. 12V, 5A power adapter with a UL listed certificate

  8. Using a digital lux meter, test the lux of the LED lights to make sure that they're at the appropriate level.

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

    The YF-1065 lux meter by Contempo Views is used in this example.

    YF-1065 by Contempo Views

    Figure 26. YF-1065 by Contempo Views

    Lux meter

    Figure 27. Lux meter measuring light from the side with the tablet mount

  9. 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 at the incorrect level, check that the LED and power supply part number are correct.
  10. Mount the phone mount on the aperture plate and the tablet mount on the opposite side with screws and nuts.

    Tablet mount

    Figure 28. Close up of tablet mount

    Assembled WFoV box

    Figure 29. Assembled WFoV box: rear view (left) and front view (right)

  11. Insert the 10x10 cm gator board aperture to fit the DUT's camera aperture.

    Gator board aperture

    Figure 30. ITS-in-a-box with the gator board aperture installed

  12. Install the phone by aligning the camera with the aperture opening. Check the alignment through the tablet opening.

    Box with one phone installed

    Figure 31. ITS-in-a-box with one phone installed

  13. Cut apertures for the cameras. You can cut a single aperture (for testing a single phone) or two apertures (for testing two phones). Apertures for the Pixel and Pixel XL front and rear cameras are shown in Figure 32. The front camera has a circular aperture because there's no flash or laser, while the rear camera has a rectangular aperture that allows the flash and laser to operate without being blocked.

    Apertures for front and rear cameras

    Figure 32. Sample apertures for front and rear cameras

    image

    Figure 33. ITS-in-a-box with two phones installed

Things to look out for

The following are examples of common manufacturing errors that can render tests flakey.

  • Back panel with tablet holes poked through. This causes the find_circle test to fail because of the extra circles created by the screw holes.

    Back panel with holes

    Figure 34. Back panel with holes poked through

  • Missing dowels. This causes the light baffles to slip out during shipping.

    Missing dowel

    Figure 35. Missing dowel on light baffle

  • Non-UL-listed power supply. Using a UL listed power supply meets the labeled specifications. This is important for operating the lighting safely.

    UL-listed power supply

    Figure 36. Example of a UL listed power supply

  • Slipping screws on the tablet or phone mount that can't support the weight of a tablet or phone. This is usually caused by damaged threads and indicates that the hole needs to be rethreaded.

    Hole with damaged threads

    Figure 37. Hole with damaged threads

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 35 mm 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 20 mm 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 the 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.