Ansi Uniformity; Jbma Uniformity; Ansi Contrast; Fofo Contrast - BenQ MP611 Product Service Manual

W: width of projected image (m)
H: height of projected image (m)
L10
L1 L2
L5
L4
L7
L8
L13
Note: L10, L11, L12, L13 are located at 10% of the distance from corner itself to L5
A2. ANSI UNIFORMITY
ANSI +Uniformity= [Maximum (L1~13)-Average (L1~9)]/ Average (L1~9)%
ANSI -Uniformity= [Minimum (L1~13)-Average (L1~9)]/ Average (L1~9)%
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
L11
L3
L6
L9
L12
14