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STV-681-M01 Datasheet(PDF) 9 Page - STMicroelectronics |
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STV-681-M01 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 44 page ADCS 7283313C 9/44 STV0681 Detailed Features 2 Detailed Features 2.1 Sensor type and image formats The sensor type is auto-detected by STV0681, the correct sensor timing is enabled and the correct image resolutions are enabled, as shown in Table 1. For stills photography, ‘High’ or ‘Low’ resolution mode can be selected, to give CIF or QCIF pictures from a CIF sensor, and VGA or QVGA from a VGA sensor (see Table 1). Reduced resolution allows for storage of more images. Images captured in both ‘High’ and ‘Low’ resolution can be stored in camera memory at the same time. Therefore there is no need to clear images stored in memory prior to changing image resolution. Where USB is connected, the host PC software (through a Video for Microsoft Windows ™ driver) can activate tethered video mode, regardless of the user inputs to the camera buttons. In this case, the image resolution is controlled by the PC driver. Note: When tethered VfW video (PC) or Quicktime driver (Mac) is activated, all images or recorded sounds or video clips are deleted from the camera SDRAM. A software solution is available (“Camera control”, as part of the SDK for PC, and “Plug’n Save” for Mac) which can monitor whether a camera is connected and warns the user if activating the VfW driver causes SDRAM contents to be deleted. Note: 1 VfW framerate is dependent on PC performance and USB bus loading 2 The number of images which can be stored is reduced if Audio sounds have been recorded on the camera or if custom sounds have been downloaded from the PC to the camera. The reduction of capacity depends on the length of audio clip, but a rough guide is that if 1 CIF image uses the same amount of SDRAM as 10sec of audio, and one VGA image uses the same amount of SDRAM as 30 sec. of audio. 3 A CIF camera with STV0681 and 64Mbit SDRAM can store up to 320 images by using QCIF mode. When more than 99 images are available, the LCD display remains at 99. When the number of available images is inferior to 99, the LCD display shows the number of available images like in all other modes. Table 1: Image modes supported Sensor Image Size Resolution mode Final Image Size Max. no. of images stored in 16MBit memory ( Note 2) Max. no. of images stored in 64MBit memory ( Note 2) Approximate VfW framerate ( Note 1) CIF 352 x 288 High CIF 352 x 288 20 80 15 frames/sec. Low QCIF 176 x 144 (Subsampled) 80 322 (see Note 3) 22.5 frames/sec. VGA 640 x 480 High VGA 640 x 480 (6) 26 2 frames/sec. Low QVGA 320 x 240 (Subsampled) (26) 107 (see Note 3) 12 frames/sec. |
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