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參數(shù)資料
| 型號： | VP7610CGFPIR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | COLOUR DIGITAL VIDEO CAMERA DECODER IC |
| 中文描述： | 彩色數(shù)字?jǐn)z像機(jī)解碼器IC |
| 文件頁數(shù)： | 3/14頁 |
| 文件大小： | 248K |
| 代理商： | VP7610CGFPIR |
2
VP7610
THEORY OF OPERATION
General Overview
The VP7610 iCamHost is a fully synchronous real-time
pipeline pixel processor for converting digitized CCD
photosite samples into co-sited, colour calibrated, gamma
corrected and aperture corrected digital video in an industry-
conventional format similar to analog video decoders. The
VP7610 supports the full iVision Command Set for control
of camera head functions such as frame rate, resolution,
exposure and colour depth via the CamPort Interface.
Access to all registers and functions is provided by an I
machine.
C state
Demux and sync recovery
The incoming CCD photosite bytes come in a single nibble at
a time in a “bi-endian” fashion from one of two CamPorts.
These nibbles are clocked in via a separate pixel clock signal.
The formatting signals such as start of active video, end of
active video, and start of new frame are all encoded into the
nibble stream. The output is an 8 bit byte of CCD sample for
each pixel clock, as well as separate horizontal and vertical
sync signals.
RAM control & 2H line delay FIFO RAM
Since the iCamHost assumes an interlaced scanning CCD
with a CMYG colour mosaic format, the colour content is
derived from different locations around where the output video
pixel is desired. Specifically, the first line from the CCD
contains “red-like” colour content, alternating with the
following line containing “blue-like” colour content. The third
line is real-time, and the first opportunity to output properly co-
sited luminance and chrominance as though the colour pixels
were superimposed upon themselves, all on the second line.
Pixel separator
Since the colourspace converter requires the 3 most recent
lines of CCD data, this block handles the shuffling of either the
2 red and 1 blue line, or 2 blue and 1 red line of data.
Colour matrix converter
The input to this converter is derived from the relative sums
and differences of the above 3 lines of sample data, and
processes them through a programmable 3x3 matrix
multiplier. The output is colour-separated and calibrated RGB
samples.
Gamma corrector
Since CRT monitors have a non-linear RGB intensity
response to input signal, gamma correction must be
performed in RGB space as well to prevent cross-coupling
errors between luminance and chrominance. This block is a
programmable 16 line-segment curve generator to provide
not only gamma correction, but any arbitrary contiguous curve
of positive slope, with end points at any level to adjust contrast
and range.
Colourspace converter
Since the output of the processor is to be YUV and not RGB,
a fixed-coefficient 3x3 matrix converter is used.
Chrominance sub-sampling & filtering
Spatial sub-sampling and filtering is performed since the
output sampling format must be reduced from 4:4:4 to 4:2:2
because most video systems do not require more
chrominance data for video camera input.
Output formatter
Devices taking digital video input such as capture, graphics
and compression chips usually require the YUV to be
formatted either in 16 bit (YU then YV) mode or 8 bit (U then
Y then V then Y) mode. The output mode is pin-strap
selectable. An output enable input signal may be used when
sharing a data bus with other video decoders. Other useful
signals such as field and colour flags are also provided.
Aperture corrector
Since both the luminance and chrominance are derived from
spatially spread pixels and the ideal output would be as though
all the pixels were superimposed upon one another, a
programmable vertical and horizontal aperture correction can
be applied to either “soften” or “sharpen” the image.
Scene-sensing luminance and chrominance metrics
There are no hard-wired closed-loop control circuits in the
processor. To achieve great flexibility in control over the
behavior of the camera head and processor system, a user-
defined region of interest is programmed which provides
statistical information about the field of video only within that
region. Peak luminance, total luminance, total red
chrominance and total blue chrominance are provided and
updated after each field.
Serial bus control
To provide read-write control over the registers within the
processor, a standard I
2
C state-machine is provided. Its
address may be offset by 3 bits to preclude address conflicts.
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