STV0974 datasheet(11/69 Pages) STMICROELECTRONICS

11 / 69 page

Functional description

STV0974

11/61

Color matrix Each pixel (RGB vector) is multiplied by a color matrix to adjust color balance.

Viewfinder and live settings are independent to allow for optimization of both LCD display and

capture for later viewing (i.e. on a PC).

Sharpness enhancement A sharpening two-dimensional mask is applied to Green only and from

interpolation. The resulting data is added (with a gain factor) to the matrix RGB data.

Downscaler The downscaler unit extracts a rectangular region of interest and resizes the image by

resampling video data. Standard image size such as CIF, QVGA and QCIF are available as well as

a fully programmable custom size:

When custom size is selected, the crop and scale parameters are subject to the following

constraints to ensure proper operation:

● Output image size must be in 8 x 8 pixels increments

● Scaling factor can be any value giving an input image size within input limits

Gamma correction A non-linear gain is applied to each pixel’s RGB components to compensate

for the display’s non-linearity. A standard curve is available for image capture for later viewing on a

PC and an S-curve is available for LCD display.

Coder The coder unit converts the internal RGB video stream to a user selectable output video

format. It is based on a YUV digital video encoder with embedded synchronization codes,

compliant with

[1], extended with the support of RGB formats for viewfinder usage, as shown in

Table 4.

Table 3: Standard image size, VGA input

Format

Image size

Cropping

Scaling

Comments

VGA

640 x 480

None

CIF

352 x 288

528 x 432

/ 1.5

82.5% of input image used, centered

QVGA

320 x 240

None

/ 2

QCIF

176 x 144

528 x 432

/ 3

82.5% of input image used, centered

QQVGA

160 x 120

None

/ 4

SubQCIF

128 x 96

None

/ 5

QQCIF

88 x 72

528 x 432

/ 6

82.5% of input image used, centered

Custom

max VGA

Any

See below

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