As we know the lighting condition affects the video quality strongly in camera. To have better presentation of the video in the camera, many algorithms of image processing are proposed. In PlatformT camera, except utilizing the sensor/DSP capabilities of the day/night handler function, the camera provides the change of video parameters according to its day/night state. This helps the camera to adapt itself widely in the applications.
The parameters of the video profile for night time state are defined here. Every parameter has the corresponding URL to access. These URLs are located in the ENCODER CGI.
Parameter Corresponding URL in ENCODER CGI Video Quality in MPEG4 NIGHT_MPEG4_QUALITY Video Quality in H.264 NIGHT_H264_QUALITY Video Quality in MJPEG NIGHT_MJPEG_QUALITY Video Bitrate NIGHT_BITRATE Maximum Video Bitrate NIGHT_MAX_BITRATE GOP NIGHT_GOP FPS Number NIGHT_FPS_NUM White Balance Mode NIGHT_WB_MODE White Balance R/B Gains NIGHT_WB_GAIN Exposure Mode NIGHT_EXPOSURE_MODE Exposure Gain NIGHT_EXPOSURE_GAIN AE Reference Target NIGHT_AGC_GAIN Shutter Mode NIGHT_SHUTTER_MODE Manual Shutter Speed NIGHT_SHUTTER_SPEED Maximum Auto Shutter Speed NIGHT_MAX_SHUTTER IRIS Mode, IRIS Level in F number NIGHT_IRIS, NIGHT_IRIS_MODE DC IRIS Level NIGHT_DC_LEVEL Video Sharpness NIGHT_SHARPNESS Video Brightness NIGHT_BRIGHTNESS Video Contrast NIGHT_CONTRAST Video Saturation NIGHT_SATURATION
Some video parameters should be concerned to be the part of the video parameters in Night Time Profile but not in the above list. These parameters could be managed automatically by firmware. So, it does not need to have user intervention. Or, these parameters have two settings for DAY and NIGHT time mode already. Here gives the description of these parameters.
WDR (Wide Dynamic Range)
There are two settings of WDR levels in the WDR configurations. Please refer to VIDEO_WDR URL in ENCODER CGI. The firmware loads the day time WDR level in day time and loads the night time WDR level in night time automatically.
DNR (Digital Noise Reduction)
This function was disabled all the time. No difference in this parameter for day/night time mode.
BLC (Back Light Compensation)
Currently, it deos not show penefit to have two settings for day/night video management. It keeps one setting for all the time.
Black Level Extension
This function is only available in the PlatformT video server which is not a day/night capable camera. We don't concern it as the video parameter in night time video profile.