K R A ME R E LE CT R O N IC S L T D .
Contents 1 Introduction 1 2 2.
1 Introduction Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world of unique, creative, and affordable solutions to the vast range of problems that confront the video, audio, presentation, and broadcasting professional on a daily basis.
2 Setting the Basic System The basic system, illustrated in Figure 1, shows a video source distributed to two VP-790 units and output to two identical projectors. Figure 1: Basic Setup i One video source is distributed to both VP-790 units via a distribution amplifier (for example, the Kramer VM-2Hxl). Each VP-790 unit outputs the signal to a separate projector.
2.1 Optical Alignment 6B Figure 2 shows an example of the two 4:3 projectors being used to project a single U U 16:9 image. Figure 2: Image Projection Set the projectors so that the light from both projectors covers the whole screen area. Use the VP-790 built-in test patterns to adjust the position, zoom and focus of both projectors.
2.1.
2. Select the horizontal grey bars test pattern in one of the two following ways: Exit the OSD menu and use the up/down arrow buttons on the front panel to cycle through the available patterns In the top OSD menu select Input, and then Test Pattern Setup and Test Pattern. Select Grey H Bars 2.1.3 Setting the Position in the Matrix 9B Define the position of each VP-790 unit in the matrix: 1. From the Setup menu, set the Operation Mode to Multiunit. Figure 4: Multiunit Screen 2.
4. Define the blend region for the VP-790 units: In the Multiunit menu, select Blend Width and set the overlap region to Right on the left hand VP-790 unit and Left to the right hand unit 5. Set Auto zoom to ON.
3 Setting Blend Width In the Multiunit menu: 1. Select Blend Curve Type and select Align Pattern to turn on the Blend Width alignment tool. The align pattern displays a sharp border of the blend and non-blend regions, making it easier to determine the width of the blend and to control the 4-corner set-up. Figure 6: Two Projected Images Displaying the Horizontal Bar Test Pattern Figure 6 shows two projections side-by-side displaying the Grey H Bars test pattern U U with the Blend Width alignment tool.
• Line 1 is the left hand edge of the right hand projection • Line 2 is the right hand edge of the left projection blend region • Line 3 is the left hand edge of the right projection’s blend region • Line 4 is the right hand edge of the left hand projection Referring to Figure 6 above, adjust line 3 to meet line 1 and adjust line 2 to meet line 4. This adjusts the blend width of each projector so that the shadowed alignment area is equal to the optical overlap.
Figure 8: Blend Width Correctly Adjusted i U You must set the number of blend width pixels to the same number for both processors. The blend will work properly even if the lines in Figure 8 do not align completely and even if the lines do not exactly match the overlap for one projector this just indicates that the optical zoom of the projectors is not matched.
4 Setting the 4-Corner Warp The images from both processors/projectors must be geometrically corrected to fit the screen and the overlapped regions must be set to align accurately. This is achieved by warping (changing the shape) the image. 1. Change the test pattern to the Warp Adjust (F). The left hand pattern is green and the right hand pattern is magenta intentionally. The color is set automatically when the position information is entered.
2. In the main menu select Multiunit. 3. Select Blend Curve Type. Switch the Blend Curve Type to OFF to give a clear image of the entire test pattern. 4. You can adjust the warp alignment in any of the following ways: Use the internal 4-Corner warp function (see below) Use the VP-790 Warp Generator application (see the online guide) To align the warp via the 4-corner warp function: 1. In the top menu select Geometry and then set Application to Anyplace: Figure 10: The Geometry Menu 2.
Figure 11: The 4-corner Menu 3. Select a corner, for example Top Left The following window appears: Figure 12: Adjusting the Location of the Top Left Corner The Diagonal Projection menu allows you to adjust the position of the X and Y coordinates of the corners of the projected image. 4. Align the test pattern on the screen by selecting each co-ordinate in turn and moving the corner of the projected image. 5.
5 Setting the Blend Curve After the alignment is complete and accurate, exit the Geometry menu. 1. In the main menu select Multiunit. 2. Select Blend Curve Type and switch Blend Curve to S-Curve to give soft edge blend (see Figure 13).
6 Setting the Black Level Compensation Projectors usually output a small amount of light even when the image is black. If the amount of light is called L, then on areas of the screen where only one projector is showing its image you will have 1 x L, and where two projectors over-lap you will have 2 x L. In a dark room showing dark pictures on the screen you will be able to see the patch-work effect.
Figure 15: The Black Level Uplift Menu In this example of a 2x1 matrix, most of the list shown above is greyed out. 4. Select Non Blend Region. This allows the black level in the non overlapped area to be raised to a dark grey. 5. Adjust this level on both processors to match the level of grey in the overlapped area. 6. If you are left with a strip down each side of the center area, Go back to the previous menu and select Reduce Black-Level Uplift Width.
You can separately adjust the top and bottom position of the edge of the correction area to bring it in line with the edge of the visual over lapped area. 7. When this operation is complete, exit the OSD menu. 8. Select the input channel that has your picture.
