CAMERA FUNCTION (OSD)

Camera functions (OSD)
Models equipped with a DSP (digital signal processing) circuitry ensure wide dynamic range and offer stable color and clear image reproduction. The various camera functions offered are described below.
1) Backlight Compensation (BLC)
When a window or other bright light source enters the screen, the adjustment of brightness to accommodate this bright area of the image may make the subject in front too dark. For example, when observing an entrance door in security surveillance applications, bright light entering from beyond the door may cause images of the faces of those entering to be completely darkened. The BLC function can be used to display the image of the subject at an appropriate brightness.

2) Wide Dynamic Range
The wide dynamic range cameras becoming increasingly popular recently are designed to release their automatic electric shutters (AES) twice per frame, and then synthesize the resulting two images so that both the dark and bright subjects are shown in a way more easily visible.
While BLC cameras allow dark subjects to be seen clearly, wide dynamic range cameras help ensure clearer reproduction of both the dark and bright subjects in an image.

wide dynamic range

3) Image Enhancer
The enhancer function adjusts and sharpens the contours of the subjects for clearer image reproduction.

4) White Balance
The white balance function permits white objects to appear correctly within color image reproductions. When this adjustment is made automatically it is referred to as “automatic white balance” (AWB). Users can choose from two automatic white balance systems: an automatic tracking type (ATW) system that continuously analyzes the image for white balance adjustment during camera operation and AWB systems that adjust and correct white balance when the power is turned on.
In a candle flame, the different colors in different parts of the flame correspond to different high temperatures; usually measured using a scale of units called “Kelvin” (K). When a candle flame is observed through a surveillance camera, the white portions appear bluish white while lower temperature portions appear yellowish red. This represents the white balance corresponding to the temperatures of the light source, with color temperature for the standard white being 6500 K. Similarly, we may sometimes notice that the colors of our
clothing we perceive indoors seem different when viewed outside in the daylight. Nevertheless, white always appears white to our eyes, regardless of the light source, because the human eye is capable of adapting to light source color temperatures.
Surveillance cameras, in contrast, have less adaptability to color temperature and therefore reproduce colors
differently depending on the light source. It is for this reason that white balance is required to adjust color tone without bias.

5) Automatic Gain Control (AGC)
This function adjusts video signals electronically in order to maintain a constant screen brightness. When an input signal of intensity exceeding the predetermined level is received, the gain is adjusted to prevent the signal from exceeding that level. Or, if the signal is too weak, it is boosted to the preset level. Thus, AGC is an automatic gain adjustment function for the purpose of keeping the signal intensity at a certain level. (Note: In the condition of low light, AGC operation can result in picture noise.)

6) Automatic Sensitivity Adjustment (AES)
This function maintains the brightness of the screen at a certain level by changing the shutter speed instead of relying on the aperture of the lens.
Note: AES cannot be used in areas where the power frequency is 50Hz, because the shutter mechanism is already utilized by the Flicker Reduction function.

7) Flicker Reduction
In areas where the power frequency is 50 Hz, light from fluorescent or mercury arc lamps may cause annoying screen flicker. This phenomenon is caused by a timing discrepancy between the standard 1/60-second shutter speed of the surveillance camera and the 1/50-second-flicker cycle of such lamps. Setting the shutter speed at 1/120-second can suppress these flickers, although it may also make the screen a little darker.

8) High-Sensitivity Accumulation Function

This function makes the shutter speed slower than normal to allow the camera to accumulate images over a longer period of time, thereby enabling color images of subjects to be produced even in dark places. Enabling this function may cause noise, after-image or frame loss on the screen. When the camera is in an extremely dark place, this function can be used in conjunction with the Day & Night function described in the following subsection.

9) Day & Night Function
When the camera is used in a place darker than 1 lux, the Day & Night function and the High-Sensitivity Accumulation function can be used together. To use the Day & Night function under dark conditions, remove the infrared cutoff filter located in front of the CCD, so that an infrared emitter is used as the light source for monitoring subjects.
Note: With this arrangement, even color cameras will generate monochrome images at night.

DAY NIGHT FUNCTION


10) Privacy Masking Function

Taking privacy issues into consideration, up to four image subject positions can be
masked on the screen, so that places like the windows of apartment buildings that must not
be photographed can be exempted from surveillance.
Note: Privacy masking provides for camera movement tracking and scalability for zoom.
11) Other useful functions include:
(a) 2X Electronic Zooming
(b) Camera Title Display, which displays the name of the location under surveillance on
the current screen.
(c) Screen Reversing, which corrects inverted or reversed images.
9) Day & Night Function
When the camera is used in a place darker than 1 lux, the Day & Night function and the High-Sensitivity Accumulation function can be used together. To use the Day & Night function under dark conditions, remove the infrared cutoff filter located in front of the CCD, so that an infrared emitter is used as the light source for monitoring subjects.
Note: With this arrangement, even color cameras will generate monochrome images at night.

DAY NIGHT FUNCTION


10) Privacy Masking Function

Taking privacy issues into consideration, up to four image subject positions can be
masked on the screen, so that places like the windows of apartment buildings that must not
be photographed can be exempted from surveillance.
Note: Privacy masking provides for camera movement tracking and scalability for zoom.
11) Other useful functions include:
(a) 2X Electronic Zooming
(b) Camera Title Display, which displays the name of the location under surveillance on
the current screen.
(c) Screen Reversing, which corrects inverted or reversed images.

CARA SETTING OSD SONY EFFIO -E