參數(shù)資料
型號(hào)： HD49815TF
廠商： Hitachi,Ltd.
英文描述： Digital Camera Signal Processor(數(shù)碼相機(jī)信號(hào)處理器)
中文描述： 數(shù)碼相機(jī)信號(hào)處理器（數(shù)碼相機(jī)信號(hào)處理器）
文件頁(yè)數(shù)： 15/25頁(yè)
文件大?。?/td> 91K
代理商： HD49815TF
HD49815TF
15
2. Color-signal processing block
RGB Setup
To the AWB
detection block
To the luminance
signal processing block
WB
+
+
LINE
SW
C-
limit
Pre-
Filter
RGB
Matrix
Gamma
correc-
tion
YL
Matrix
Base
clipp-
ing
C-G
RGB
Gain
Axis
conver-
sion
Axis
conver-
sion
(WB)
From
the input
line
memory
block
To
the zoom
function
Figure 4 Color-Signal Processing Block
a. C-limit (complementary color clipping level) function
High clipping processing is performed on the complementary color signals independently. High
clipping is set in State Data SP_A2 [0 to 3].
The complementary color signal indicates Gb: (G + Cy), Wr: (Ye + Mg), Wb: (Mg + Cy), and Gr:
(G + Ye).
b. RGB-matrix block
The three primary colors (red, green, and blue) are acquired in the RGB matrix by multiplying
arbitrary coefficients by the four complementary colors (Gb, Wr, Wb, and Gr) and taking the total of
those results. The RGB matrix is designed to support the minimum color moire and to enable free
color reproduction. Arbitrary coefficients are set in State Data SP_A2 [4 to 15]. The following
shows the formula.
Gb
Wr
Wb
Gr
State Data SP_A2 [4 to 15]
KRa
KBa
KGa
=
R
B
G
KRb
KBb
KGb
KRc
KBc
KGc
KRd
KBd
KGd
c. RGB-setup block
The black level of the color signals is variable according to the coefficients of the RGB matrix. The
value calculated by the formula below is subtracted from the color signal to correct the black level.
The subtracted value can be set externally and is set in State Data SP_A3 [0 to 2].
Formula =
[48
×
Σ
(Matrix data)
×
2
3
]
d. RGB-gain block
The RGB gain value acquired in the AWB control is set in the RGB gain circuit to improve the
white reproduction performance. As it is set prior to the gamma correction, it changes the gamma
correction amount. The RGB gain can be set in State Data SP_A3 [3 to 5] from 1 to 256 times.
(The G gain is set from 1 to 128 times.)
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