Image warp processor - Warper4K Front View

Warper4K 
Warp Processor

The Warper4K-DP is a low latency, general purpose warp processor, suitable for applications to “re-shape” video prior to a display device. This re-shaping may be prior to a projector, or to “undo” the video shaping intended for a projector, prior to a flat panel display. The Warper4K-DP is available with 1 to 5 I/O channels.

Features

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Process up to 5 video streams

Process up to (5) video streams and outputs up to (5) display devices

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DisplayPort resolutions up to 4K

Each I/O can support resolutions up to 4096×2400, including UHD (3840×2160)

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Powerful processing capabilities

Supports geometric correction, edge blending and uniformity gain and bias adjustments (available in future revisions)

Applications

Distortion correction for high resolution projectors

Processing video for a projector into video for a IOS monitor

High resolution, edge-blended displays

Display Interfaces and Control

Image warp processor - Warper4K Connectors View

Geometric Correction

Forward Mesh

Correction formed with a mesh representing fixed points in the input space and where they are mapped in the output space.

Mesh sizes are 2×2, 3×3, 5×5, 9×9, 17×17, and 33×33. Mesh points can be either inside or outside the output active area.

Inverse Mesh

Correction formed with a mesh representing fixed points in the output space and where they are mapped in the input space.

Mesh sizes are 2×2, 3×3, 5×5, 9×9, 17×17, and 33×33. Mesh points can be either inside or outside the input active area.

Native Correction Coordinates

Each output pixel is derived from a “mapped” location relative to the input space. Correction coordinates are spaced every 32 output pixels.

Correction coordinates between the 32 pixel-space are calculated by linear interpolation within the Warper4K. Correction coordinates can be either inside or outside the input active area.

Edge Blending Gain and Bias Adjustments

Per-pixel gain adjustment (for blending area)

Each outgoing pixel may require a per-pixel gain adjustment (PPGA) to facilitate edge blending of multiple projectors, or to improve overall uniformity. Downloadable PPGA maps contain a 8-bit gain for each pixel in the active output area. The gain map uses a .png file format. Figure 5 on the right shows a PPGA map consisting of a Westar logo, applied to a 4K x 2K test image.

*Per-pixel bias adjustment (for uplift after blending)*

Each outgoing pixel may require a per-pixel bias adjustment to facilitate pixel uplift after edge blending. Each pixel is mapped to 1 of 16 regions. Each region has individual R, G, B bias adjustments based on the color intensity level. The region map uses a .png file format. Built-in filtering smooths any pixel-to-pixel variations in bias.

*Uniformity Gain and Bias Adjustments*

*Per-pixel gain adjustment (for uniformity)*

Each outgoing pixel may require an independent R, G, and/or B gain adjustment to facilitate uniformity across the entire projector. The Warper4K facilities uniformity via a lattice of RGB gain points, each with a gain setting for 100%, 50%, and 0-25% intensities.

Gains are interpolated at each lattice point between 100% and 50% intensity, and between 50% and 25% intensity. For intensities between 0% and 25%, the lattice point gain is equal to the 25% setting. Each pixel RGB gain is then interpolated between the 4 nearest neighbor lattice points.

*Per-pixel gain/bias adjustment (alternate approach)*

The 0-25% RGB gain point (described above) can alternately be a bias. In this case, the Warper4K facilitates a lattice of RGB gain/bias points, each with a gain setting for 100% intensity, a gain setting for 0-50% intensities, and a bias value for all intensities.

The RGB gains are interpolated at each lattice point for intensities between 100% and 50%. For RGB intensities from 0 to 50%, each RGB lattice point gain is set to the 50% intensity gain setting. Per pixel gains and bias are then interpolated between the 4 nearest neighbor lattice points. Up to 45×25 lattice points are available for 1080P, 2560×1600 and 4K horizontal resolutions.

*Features that are not yet integrated but will be in field upgradable future revision*

Example Applications

General Purpose Projector Warping, Inverse Mesh

The Warper4K can perform warping and edge blending prior to your projector. The figure below shows a 3840×2160 image (from an IG channel) that is re-shaped by the Warper4K based on a user defined 2×2 inverse mesh into a new 3840×2160 image. Because mesh coordinates (0,0) and (1,0) are “outside” the active area, the output image is reduced.

 

Please contact Westar if you’d like to discuss specific details about forward or inverse meshes.

General Purpose Projector Warping, Forward Mesh

The Warper4K can perform warping and edge blending prior to your projector. The figure below shows a 3840×2160 image (from an IG channel) that is re-shaped by the Warper4K based on a user defined 9×9 forward mesh. Forward mesh points are fixed in the input space and may be placed inside or outside the output active area. In the case below, all mesh points remain in the output active area.

Please contact Westar if you’d like to discuss specific details about forward or inverse meshes.

Processing video intended for projector into video for IOS monitor

Images may be rendered in the image generators for the intended projectors.  This video may not be suitable for display on a regular desktop monitor or IOS monitor.  The Warper4K can perform geometric correction to converted projector video into video more suited for desktop monitor display.

In the figure below, (2) 2560×1440 images are rendered by IG’s and sent to projectors.  The images are rendered sideways, so that the 2560×1440 projectors can be mounted sideways.  The images include overlapped data for edge blending, and a trapezoidal look based on the projector and screen geometries.  While these images help create an outstanding multi-projector out-the-window view, the images are not suitable for display on an IOS (trainer) monitor.

The Warper4K can take each of the feeds, trim out the duplicate data, and “undo” the trapezoidal shape for each of the (2) projector feeds.  A Westar EZwindow4K is then used to rotate and combine the 2 slices into (1) 4K feed that can be displayed on any monitor.

Specifications

ParameterSpecification
Video Input / Output
Video TypeDisplayPort 1.2
Pixel Rate148.5 to 600 MPixels/sec
Standard ResolutionsFrom 1080P up to 2560x1600 at 120 Hz, 4096x2400 at 60 Hz
Functional
Warping
  • Maximum horizontal warp is +/- 50 degrees
  • Maximum vertical warp is +/- 45 degrees
  • Forward Mesh, Inverse mesh sizes are 2x2, 3x3, 5x5, 9x9, 17x17, and 33x33
  • User may also directly load correction coordinate grid on 32 pixel spacing
  • All correction approaches distill into a correction coordinate grid
  • Correction coordinates map outgoing pixel to input space, with 1/8 pixel resolution
Vertical Re-sizeMust be > 0.3
Horizontal Re-sizeMust be > 1/8
Pixel Calculation24 tap horizontal and 24 tap vertical FIR filter used to process a 6x6 nearest pixel array on 1/8 pixel boundaries
Color Depth10 bits per color I/O. Internal color processing is 12 bits per color
Edge BlendPer pixel gain for edge blending (and/or uniformity matching) is 8 bits. *Per pixel bias for "uplift" after blending*
*Uniformity**Per pixel gain (and bias) calculated from a programmable lattice of gain and bias values. Used to correct for uniformity*
Specialty Features
  • *Forward gamma LUTs*
  • *Embedded test patterns for alignment*
  • Programmable EDID for each input channel
Processing B/W and Latency
Processing B/WEach incoming frame is processed with no frame dropping
Latency1 msec built-in delay, plus additional delay based on vertical warping
System
Dimensions19”W x 13.75”D x 1.75”H (1U rackmount)
WeightLess than 7 lbs.
ControlUSB 2.0, *Ethernet*
Input PowerIEC Connector, 100-240 VAC, 47-63 Hz, 150 Watts Maximum Input Power
Warranty and Support
Warranty1 Year Limited Warranty
Technical SupportPhone and Email Support Available
*Features that are not yet integrated but will be in field upgradable future revision*

Ordering Information

Warper4K is ordered with 1 to 5 I/O processors, and is identified as Warper4K-DPx, where x is the # of I/O channels

The system comes with:

  • Warper4K base unit as ordered (1-5 I/O channels)
  • USB Cable
  • IEC power cable with US plug
  • CD containing
    • Warper4K API (Windows)
    • Wink Software and Source code
    • Mesh4K Utility Software
    • Warper4K User’s Manual

Contact us for info on Warper4K options and accessories.

Want to find out more?

If you are interested in more information, send us an inquiry.