3D Test Images

The goal of this project is to provide a set of stereographic 3D (s3D) images to aid in the testing and evaluation of stereoscopic digital displays. See this project's wiki for more background information and details.

Features

Provided here are a set of JPEG test images in a variety of sizes and formats most commonly used for digital s3D displays. These include:

• A test to evaluate crosstalk (ghosting) issues and to determine the optimal viewing distance and angles.

• A test that confirms the correct assignment of the left and right images and illustrating relative depth with respect to the stereo window.

• Tests for determining the optimum digital image sizes for a given hardware device and software combination.

Getting Started

The images provided here are designed to be downloaded to your s3D viewing device and viewed as you would any stereographic image on that device. No other software is required. The images have been crafted to allow you to evaluate aspects of your viewing device just by observation. In particular, the resolution tests will allow you to evaluate how well your device and viewer application(s) can render images in sizes other than the native (hardware) display size.

Directory	Description	Notes
MPO	Multi-Picture Object	container file; separate left & right images
JPS	Stereoscopic JPEG	right/left as a single side-by-side images
LR	Left/Right	left/right side-by-side images
LRB	Left/Right w/ Border	bars added to maintain 16:9 aspect ratio
LRQ	Left/Right sQuashed	half width left/right images
AB	Above/Below	above-below images; left on top
ABQ	Above/Below sQuashed	half height above/below images

The [wiki](https://github.com/Bill-Costa/3D-Test-Images/wiki) describes each format, and its application, in detail.

You do not need to download all of the images, only those formatted as required for your device. See the wiki if you need help determining the correct format. If you have an application designed specifically for viewing stereoscopic images, you should probably download at least the MPO format tests.

To download the images from GitHub, select a folder from the list, and then within the folder's contents list, click on each image to display it. Use the Download button provided to fetch your own local copy.

Note that not all possible s3D formats are currently provided, only the most popular ones commonly found. If your device requires a format not listed here, please file an issue.

Usage

For each of the 3D format types listed above, one or more of the following test files are provided.

• extinction-red-cyan-* : This test is designed to evaluate the degree of cross-talk for multiplexed displays, such as 3D TVs and autostereoscopic (glasses free) screens found on 3D smart phones and tablets. Use cases include:

  a. Finding the 3D sweet spot of the display which can be dependent upon the viewing angle and distance.

  b. Evaluating the effectiveness of different brands and types of polarized 3D glasses.

  c. Evaluating the overall effectiveness of the display to produce ghost-free images caused by crosstalk.

  The test requires wearing the appropriate 3D glasses if required by your device. View the image with just your left eye, and then just your right. The goal is to see a smooth single uninterrupted solid color across the entire screen for each eye.

• depth-black-white-* : This test uses an abstract image to clearly illustrate the stereoscopic effect created by the device. Use cases include:

  a. Illustrating the concept of the stereo window.

  b. Verify the correct assignment of the left and right image 'channels'.

  When viewed in 3D, the center square should appear to be in front of the stereo window. The dashed lines and quad-square should appear to be at the window, which will appear to be at the surface of the display. You should also be able to confirm that the text LEFT in the lower left hand corner can only be seen by your left eye, and vice versa for the RIGHT text in the lower right.

• usaf-1951-* : These test consists of a 2D resolution chart rendered at a variety of common raster digital image sizes.

  a. 0720 pixels high for HD displays b. 1080 pixels high for Full HD displays c. 1440 pixels high for Quad HD displays d. 2160 pixels for Ultra HD displays e. 2880 pixels for 5K HD displays f. 4320 pixels for 8K HD displays

  Note that aspect ratio of the test image itself is near square so that it can be used with a viewing device like the Google Cardboard which divides a smart phone's landscape display in half to form the required left/right stereographic image pair.

  One of the images above should match or closely match your device's native resolution. However you should examine all of the test sizes to evaluate how well your device and application(s) can upscale and downscale the image. If you use more than one application to view your stereographic images, you should test each one against all of the image sizes provided, since how well the scaling is done can be a function of the software being used.

  Note that left and right images in these test images are identical, so there will be no observable 3D effect.

  The goal is to identify which image sizes, if any, are not well rendered on your device, so you can optimize your image library to image sizes that take the best advantage of your display. Do not assume that higher than native resolutions will necessarily yield well rendered results. We seen device and software combinations where larger size images actually look less sharp than smaller image sizes.

Getting Help

If you have questions or need help in using these resources, please file an issue. We will do our best to respond to all issues as time permits.

For help in general regarding the creation and viewing of stereographic 3D images, we highly recommend the Photo-3D on-line forum.

Errors and Bugs

If something is not behaving intuitively, it is a bug and should be reported. Report it here by creating an issue:

https://github.com/Bill-Costa/3D-Test-Images/issues

Help us fix the problem as quickly as possible by following Mozilla's guidelines for reporting bugs.

Contributing Guidelines

All contributions and suggestions are welcome!

For suggested improvements and feature requests, please file an issue.

For direct contributions, please fork the repository and file a pull request. If you never created a pull request before, here is a helpful tutorial on how to send one.

Code of Conduct

In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation. Code of Conduct FAQ

Credits

Thanks to the following folks for generously sharing their knowledge and ideas on this subject, and in some cases releasing their own work to the Creative Commons community which allowed us to use it here.

• Itzhak Baum for his vector graphics version of the USAF 1951 resolution test target.)

• Damir Vrancic (a.k.a. crunchy_3d on the Photo-3D Yahoo Group) for the inspiration of the elegant cyan/magenta extinction test.

• Contributor Code of Conduct text provided by Contributor Covenant

License

Copyright (c) 2018 [mailto:[email protected]](Bill Costa). Released under the Creative Commons Attribution-ShareAlike 4.0 International license.