Sony SNC-CS50P - Manual (Page 13)

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The Sony SNC-RX550/RZ50/CS50 Series of network cameras
incorporates “Dynamic Frame Integration” technology to
reproduce clear and smooth images for both still and
moving areas within an image. This technology takes
advantage of the relatively high sensitivity inherent in
interlaced scanning CCDs, which are incorporated in these
cameras.
A technology called I/P (Interlace/Progressive) conversion is
required to produce progressive pictures from a camera
that employs interlaced scanning CCDs.
One method of producing these progressive pictures is to
simply combine two adjacent picture fields into one
picture frame. This is called “Frame Mode” in Sony
network cameras. This method provides high vertical
resolution and works well for still areas within an image;
however, if a fast-moving object appears in the image,
those areas with movement become blurry (Fig. 1-A).
On the contrary, “Field Mode,” which is an optional
setting with these network cameras, produces progressive
pictures by utilizing data from the even field only (i.e. lines
0, 2, 4, 6...). This method reproduces absent lines of the
interlaced field by interpolating data from the lines above
Dynamic Frame Integration (DFI)
and below them. “Field Mode” can reduce blurred
images caused by fast-moving objects; however, vertical
resolution is half that of “Frame Mode” and this method
of processing images can produce jagged edges in still
areas of the image, particularly in angled lines with high
contrast (Fig. 1-B).
Combining the advantages of the two I/P conversion
techniques, DFI technology adaptively selects from “Frame
Mode” and “Field Mode” within an image to reproduce a
progressive picture. The algorithm is such that it detects
‘Motion’ within an image on a two-pixel basis. For areas
where motion is detected, DFI applies “Field Mode” to
minimize blurring, and at the same time, it applies “Frame
Mode” to still areas to maintain high resolution without
jagged edges (Fig. 1-C).
*1 In summary, DFI technology takes
advantage of the high sensitivity inherent in the
SNC-RX550/RZ50/CS50 Series of cameras to produce clear
and smooth images even under low-light conditions (Fig. 2).
*1 Depending on the scene, the DFI algorithm may not process the image properly; however, the image will always be clearer than that of Frame Mode.
High vertical
resolution
for still areas
Blurry for
fast-moving
objects
Jagged edges and
decreased
resolution in
still areas
High vertical
resolution
for still areas
Reduced blur for
fast-moving objects
Reduced blur for
fast-moving objects
Even field
Blue : Still areas in image
Red : Moving objects in image
Interlaced Fields
Progressive Signal
Odd field
Fig. 1-A Frame Mode
Fig. 1-B Field Mode
Fig. 1-C Auto Mode (DFI ON)
Auto Mode (DFI ON)
Still area: Frame mode
Moving area: Field mode
Frame Mode
Fig. 1 I/P Conversion Mechanism
Fig. 2 Comparison Between Auto Mode (DFI ON) and Frame Mode