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VX6953CB Datasheet(PDF) 64 Page - STMicroelectronics |
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VX6953CB Datasheet(HTML) 64 Page - STMicroelectronics |
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64 / 107 page  Video timing VX6953CB 64/107 8209023 Rev 5 6.4 Image compression The objective of the image compression is to reduce the required bandwidth in transmission between the sensor and the host. The key features of the DPCM/PCM compression algorithm are: • visually lossless • low cost implementation (no line memories are required) • fixed rate compression The 10-bit to 8-bit DPCM/PCM image compression algorithm is supported by VX6953CB. 10-bit to 8-bit compression has the additional advantage that one pixel value equals 1 byte of data. The level of compression is controlled through the CSI_data_format register. The same register is also used to enable and disable compression. The compression_mode register is used to select the compression algorithm. Currently only the DPCM/PCM technique is supported. Therefore the value of this register is always 0x01. The compression_capability register tells the host whether a sensor module does or does not have compression and, if it has compression, what is the compression technique. Again currently only the DPCM/PCM technique is supported. Please also refer to section 10 of the SMIA1.0 specification document. 6.5 Exposure and gain control VX6953CB does not contain any form of automatic exposure control. To produce a correctly exposed image the integration period and analogue gain for the pixels must be calculated by an exposure control algorithm implemented externally. The parameters are the written to the VX6953CB using the CCI interface. The exposure control parameters available on VX6953CB are: • fine integration time • coarse integration time • analog gain • digital gain The exposure control parameter registers are defined in Chapter 4 on page 29. Integration time and analogue gain capability registers should be used to determine the exposure control parameter limits for a given video timing configuration. See Section 6.7 of the SMIA 1.0 part 1 specification for more information on how to interpret the integration and gain capability registers and how to calculate exposure and gain limits. 6.5.1 Analogue gain model VX6953CB only supports the single global analog gain mode. VX6953CB has a 16-bit register (0x0204 and 0x0205) to control analog gain. However, only 4 bits are supported by the SMIA1.0 description. Two extra bits can be used for fine gain between values 8 and 16 but their description is not currently supported by SMIA1.0 specification. Figure 26 shows how the analog gain bits are used for VX6953CB. Use only Coarse Gain bits for standard 1/x functionality. |
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