Precise Handling Of Highlight Position - Sony BVP-900 Series Product Information Manual

5-2. Precise Handling of Highlight Position

(a) Optimized bit assignment
The video level up to 260% is processed linearly. Highlights over 260%
are compressed by a pre-knee circuit before A/D conversion,
providing the most efficient utilization of the 12-bit A/D conversion
process.
(b) Knee Saturation
Knee Saturation eliminates both the 'washed out' effect and hue
changes in overexposed areas of a picture, providing more natural
color reproduction.
Normal
ON
Photo 5-3 Knee Saturation ON and OFF
(c) Adaptive highlight control (Auto Knee mode)
Conventional cameras only have a single knee point/slope
characteristic. In contrast, the Sony ADSP system has multiple knee
point/slope characteristics. The camera intelligently monitors the
brightness of all areas of the picture and adapts the knee point/slope
for optimum reproduction. A typical example is shooting an interior
scene which includes a sunlit exterior seen through a window. This
new function applies only to video levels in excess of the knee point,
the middle and low luminance parts remaining unchanged.
Intput signal level
white clip
auto slope
Figure 5-3 Knee curve image
Normal
ON
Photo 5-4 Adaptive highlight control ON and OFF
BENEFITS OF SONY ADSP
Output signal level
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