參數(shù)資料
型號(hào)： KS7314
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Digital Zoom(數(shù)字圖像放大)
中文描述： 數(shù)碼變焦（數(shù)字圖像放大）
文件頁(yè)數(shù)： 21/28頁(yè)
文件大?。?/td> 186K
代理商： KS7314
KS7314
DIGITAL ZOOM
11. Special effect III (Mosaic)
PCK
UVCK
R1
B1
R2
B2
R2
R1
B1
Y1
Y9
Luminance
Chrominance
The mosaic function offers the user an ability to form a blocked area of a set size on screen, to display the
image with an obscure outline. The room processor supports a mosic effect implemented in block sizes of
4
×
4, 8
×
8, 12
×
12, 16
×
16, . . . 60
×
60, 64
×
64, making 16 sizes altogether. To obtain the mosaic effect, first
decide on the mosaic size and then fill out the block with uniform pixel value for every pixel in the block.
The process should be performed according to luminance and chroma signals separately. As for the
process of luminance signal, in order to maintain uniform brightness of pixels, take the value of the
uppermost-left pixel of the block as the representative value, and then replace all the rest of the pixel
values in the block. For the process of replacing all the pixel values with the representative value, first
adapt the system clock to conform to the selected mosaic mode by means of demultiplying the clock by 4,
8, . . . 64, and use this demultiplied clock as the mosaic clock. The case of chroma signal is fairly
complicated. Since the chroma signal alternates R-Y to B-Y by the clock, the luminance method can not
be directly applied and that the adjustment of the mosaic clock is necessary to maintain R-Y and B-Y
chroma components. The replacement of a vertical pixel value with the representative value can be
achieved by the read/write enable control of 1H delay line, applied in horizontal expansion. In the vertical
signal process for a mosaic, attention is invited to the fact that the standard TV screen comes separated in
even and odd fields by interlaced scanning. Signal process only in a half of that required in the horizontal
process would be sufficient.
For example, in an 8
×
8 mosaic mode, only 4 lines of mosaic video process vertical will display a square
mosaic block on screen.
In the same manner, the mosaic process of luminance and chroma signals in vertical direction can be
performed. In case of a vertical mosaic, the system delay in vertical direction may vary, depending on the
type of camcorder usage. That user may, in case of a vertical mosaic operation, take the dummy data of
black level appearing on the top side of the screen for the initial mosaic start line, and a symptom, in
which the black level on the top side would grow as the mosaic block size grows, may develop. The
system micom is, therefore, designed to be capable of controlling the vertical mosaic start line in order to
avoid such symptoms. The mosaic function is enabled in EIS electronic image stabilizer mode of
operation.
Fig.
7
Horizontal mosaic timing diagram (8
×
8 mosaic)
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