Sensoray 817 Manual do Utilizador descarregar pdf (Página 5)

Data Types

All data types are defined in

s817.h

. Integer types are 32-bit.

VIDEO_MODE

typedef struct {

MODE_TV_FORMAT tvFormat;

MODE_JPG_SIZE jpgSize;

MODE_BMP_TYPE bmpType;

int brightness;

int contrast;

int saturation;

int hue;

} VIDEO_MODE;

tvFormat

Defines TV format:

TV_NTSC

for

NTSC

TV_PAL

for

PAL

Note:

It is not recommended to switch the input signal from one TV standard to

another while the board is capturing. This may result in a lock up requiring

software restart.

jpgSize

Defines captured image size:

SIZE_4CIF -

640x480 (NTSC), 704x576 (PAL);

SIZE_4CIFI -

640x480 (NTSC), 704x576 (PAL), deinterlaced;

SIZE_2CIF -

640x240 (NTSC), 704x288 (PAL);

SIZE_1CIF -

320x240 (NTSC), 352x288 (PAL).

This parameter applies to both JPEG and bitmap captured images.

Images captured in SIZE_2CIF format represent one field of interlaced video. Such

an image looks stretched in the horizontal direction, if displayed directly, but it does

not have motion artifacts characteristic to interlaced images. Capture of fields is

supported only at the frame rate (i.e. one field per frame, 30 fields per second for

NTSC, 25 for PAL).

Images captured in SIZE_1CIF format represent one field of interlaced video scaled

down horizontally by a factor of 2. The same capture rate limitation as for

SIZE_2CIF applies.

Images captured in SIZE_4CIFI format have one field recreated by interpolating the

lines of another field. This removes motion artifacts at the expense of some losws of

vertical resolution.

PAL images captured in SIZE_4CIF and SIZE_1CIF sizes have slightly distorted

aspect ratio of 1.222 instead of 1.333.

bmpType

Format of uncompressed image. Currently only monochrome 1 byte/pixel (Y8)

format is supported.

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