Operating instructions

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Note: Each HQView unit needs to be provided with the exact same value for left and right blend region.

Top and bottom blend region have to be identical as well, but don´t need to have the same value as left

and right. The HQView units do not communicate between each other and thus they have to make an

assumption for auto zoom calculations and that is overlap of the neighbouring (and those beyond)

projectors is identical.

3.8.5. Blend Curve Type

The blend curve type menu allows to set the blending characteristics. For setting up the overlap the

Align Pattern should be used. Align Patter reduces the image intensity of each pixel in the blend area by

half. When the blend region set up through the blend width menu and the physical blend match the S-

Curve characteristics can be switched on. The image intensity is gradually reduced from the start of the

blend to the edge of the respective projector image. The S-Curve Value slider allows to control the

steepness of the S-Curve. For convenience in this Blend Curve menu a duplicate of the Output Gamma

slider can be found to match the grey scale of the images.

When a custom alpha map was loaded into the file system of the unit it is recognized at boot time and

the Custom Alpha Map menu item becomes available. Custom alpha maps can be uploaded through

the web or remote control API interface of HQView. The map can be switched on and off. The map is

combined with the Align or S-curve map internally generated. If that is not wanted Blend Curve Type has

to be set to off.

The blend map can be warped or left unwarped. Typically, Blend Warping is set to yes at all time.

Automatic calibration systems may decide to calculate the blend warp rather than using HQView for this

purpose. Automatic systems control HQView through API calls, in which case the Blend Warping is set

automatically and does not need to be touched.

3.8.6. Black-Level Uplift

This enables the user to provide a black level uplift to compensate for the additional light leakage from

multiple projectors in overlap regions. The black level uplift can be set for the 9 possible regions of the

image. Setting the black level uplift for the middle of an edge also sets the black level uplift for the two

adjacent corners, and if needed the corners can then be set individually. The sliders for all regions

which are not involved in edge blending for a given multiple unit configuration are greyed out, and the

black level uplift for all these regions can be set together using the Non-Blend Region parameter.

3.8.7. Reduce Black-Level Uplift Width

The Black Level Uplift field may need to be adjusted to achieve a perfect result. There may be an area

of light leakage beyond the edge of the active image from the projector. With these controls the edges

of the black uplift region can be moved so they can be aligned with the edges of the area of light

leakage. In the case of projection under non-rectangular conditions the projection fields of adjacent

projectors are not aligned with the blend region. The corners of the non-blend region can be moved to

allow tracking of the edge of the projection field of adjacent projectors.