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L11
L13
L12
L10
L1
L2
L4
L7
L5
L8
L9
L3
L6
Note: L10, L11, L12, L13 are located at 10% of the distance from corner itself to L5
A2. BRIGHTNESS UNIFORMITY
Brightness Uniformity = Minimum (L10,L11,L12,L13)/ Average (L1,L2,L3,L4,L5,L6,L7,L8,L9)
A3. JBMA UNIFORMITY
JBMA Uniformity = Average (L1,L3,L7,L9)/ L5
A4. ANSI CONTRAST
ANSI Contrast = Average lux value of the white rectangles/Average lux value of the black
rectangles
Contrast Ratio shall be determined from illuminance values obtained from a
black-and-white ”chessboard” pattern consisting of 16 equal rectangles. The white rectangles
shall be at 100% gray and the black rectangles at 0% gray. Illuminance measurements shall
be made at the center of each of the rectangles.
A5. FOFO CONTRAST
FOFO Contrast = Lux value at the center of a solid white screen/the lux value at the center of
a solid black screen
A6. JBMA CONTRAST
JBMA Contrast = Average (L1,L2,L3,L4,L5,L6,L7,L8,L9) under solid white / Average
(L1,L2,L3,L4,L5,L6,L7,L8,L9) under solid black
A7. LIGHT LEAKAGE
Leakage = The maximum light leakage under a solid black pattern in or outside of the
projected image