Ai338
3.3.6. Signal shading
1) Set 1.0 lx illumination condition, then measure the signal output.
2) Make composition of luminance signal Y.
3) Apply low pass filter to luminance signal Y ( ex : rank filter and convolution filter ).
4) Measure the maximum and minimum value of luminance signal Y.
5) Detect Signal shading with the following formula.
Shd [ % ] = ( ( Y.max – Y.min ) / Y.mean ) x 100
3.3.7. Uniformity between video signal channels : Red
1) Set 1.0 lx illumination condition, then measure the signal output.
2) Make red chroma signal R – Y and luminance signal Y.
3) Apply low pass filter to chroma signal R – Y (ex : rank filter and convolution filter ).
4) Measure the maximum and minimum value if red chroma signal R – Y.
5) Detect
△Sr
with the following formula.
△Sr
[ % ] = ( ( R – Y ).max – ( R – Y ).min ) / Y.mean ) x 100
3.3.8. Uniformity between video signal channels : Blue
1) Set 1.0 lx illumination condition, then measure the signal output.
2) Make blue signal B – Y and luminance signal Y.
3) Apply low pass filter to chroma signal B – Y ( ex : rank filter and convolution filter ).
4) Measure the maximum and minimum value of blue chroma signal B – Y.
5) Detect
△Sb
with the following formula.
△Sb
[ % ] = ( ( B – Y ).max – ( B – Y ).min / Y.mean ) x 100
3.3.9. Flicker : Y
1) Set 1.0 lx illumination condition, then measure the signal output
2) Measure odd field output value ( Y.ODD ).
3) Measure even field output ( Y.EVE ).
4) Detect Flicker Y with the following formula.
FlkY [ % ] = ABS ( 2 x ( Y.ODD – Y.EVE ) / ( Y.ODD + Y.EVE ) )
3.3.10 Flicker : Cr
1) Set 5.5 lx illumination condition with red filter, then measure the signal output.
2) Make red chroma signal R – Y.
3) Measure odd field output value ( CR.ODD ).
4) Measure even field output value ( CR.EVEN ).
5) Detect Flicker Cr with the following formula.
FlkCr [ % ] = ABS ( 2 x ( CR.ODD – CR.EVE ) / ( CR.ODD + CR.EVE ) )
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