EagleVision License Plate Recognition Digital Video Recorder DVR Specifications
  
Model ERS-LPR-DVR Description with Visibility Enhancement Illustrations and Specifications
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Using Visibility Enhancement Settings

License Plate Recognition Visibility Enhancement Configuration Settings are Located in the “Motion Detection” Menu.
 
 
Description...  In a closed environment without light sources, Visibility Enhancement selections applied to general security cameras cannot work the same way as it does with Eaglevision LPR infrared cameras. If the field of view of a camera contains light sources or light reflection spots, you are able to mask them out to get better Visibility Enhancement results. If you are only interested in one portion of the camera view, apply Visibility Enhancement on that portion only. The result will be better than applying Visibility Enhancement to the whole camera view. Sharpness adjustment helps sharpen blurred field of view caused by focus loss, especially if you want to sharpen blurred images or blurred text. Sharpness adjustment cannot further enhance a clear field of view nor make it more visible. Object size filtering during motion detection may have outstanding effects in certain cases. For example, size filtering can be configured to ignore small-size objects such as flashing stars and distant street lamps, and also General camera devices in low lighting environments produce video signal noises. Video signal noises always result in bad video quality and larger record size. Noise reduction helps eliminate video signal noises to improve video quality and minimize record size.

 
Adjusting Sharpness


Figure 3 (a) Original picture  


(b) Sharpness level = 3

The Sharpness Option.... is used to enhance edges of the image available in the “Motion Detection” dialog box.

Figure 2: Adjusting Sharpness ... Step 1: Select the “Sharpness” item in the “Process” list box to display its settings.  Step 2: Select/deselect the “Sharpness” check box to enable/disable sharpness adjustment.  Step 3: Adjust the “Sharpness level” slider to control the level of sharpness to be applied on the camera video. Sharpness adjustment example:  Figure 3 (a) shows the original picture, and Figure 3 (b) is the result after applying sharpness.    

 Applying Noise Reduction

Noise reduction function 
Helps eliminate noise signal of camera input. It is more efficient applied in night conditions, or after you enable Visibility Enhancement feature. Noise Reduction does not only reduce recording video size (average 10%~50%), it also maintains same video quality. This option is available in “Motion Detection” dialog box.


Figure 5-1: Original picture Nightime
(Size: 7524 bytes/frame)


Figure 5-2: After applying Noise Reduction
(Size: 4116 bytes/frame)
Nighttime: Noise Reduction ratio is 45.3%


Figure 5-3: Original picture Daytime
(Size: 5356 bytes/frame)


Figure 5-4: After applying Noise Reduction
(Size : 4026 bytes/frame)
Daytime: Noise reduction ratio is 24.8%

 Applying Size Filtering

Description Size filtering settings in the "Motion detection" dialog box
The reduction ratio of the video recording size varies from day to night and depends on whether the content captured by the camera is static or not. In general, the reduction ratio at nighttime is higher than daytime. Lesser-motion video is also higher than heavy-motion video, and HM compression is higher than M-JPEG compression. Figures 5-1 to 5-4 show a comparison of video recording sizes, using a video dimension of 320x240 pixels and the HM compression method. The camera will generate many noise signals in the nighttime because of low lighting, and will always create significantly large-size video recordings. Figure 5-1 shows the original picture at nighttime. Figure 5-2 illustrates that the noise reduction process can reduce the video recording size, but still maintain the same video quality as Figure 5-1. Figure 5-3 is the original picture in daytime, and Figure 5-4 shows that the size reduction ratio is 24.8%.

Size filtering is an extra option in the “Motion Detection” dialog box. Open the “Motion Detection” dialog box to customizing size filtering settings.

Appendix

 Illustrates solutions for different LPR environmental situations including low lighting environment, fixed light sources in low lighting environment, moving light source in low lighting environment, back lighted environment, and overexposure in lighting conditions. In this Appendix, detailed examples are provided to explain how to use the Visibility Enhancement card effectively.

1. Low Lighting Environment....


Example A2-1（Outdoor Situation  .... There are some shopping stores and light sources along the street at night. Figure A2-1 is the original picture without Visibility Enhancement applied; Figure A2-2 was applied with Visibility Enhancement and “Brightness balance adjustment” was set to a positive range. The content of billboard in Figure A2-2 is clearer than Figure A2-1. Figure A2-3 shows Visibility Enhancement settings in Example A2-1.

 
                  Figure A2-1: Original                           Figure A2-2: Visibility Enhancement applied


Settings used in Figure A2-2

Example A2-2（Indoor Situation) .... The images in this example were captured from a backlighted environment. Figure A2-4 is the original picture from the camera, whereas Figure A2-5 was applied with Visibility Enhancement using the settings shown in Figure A2-6. It looks like we can hardly see any visual differences between Figure A2-4 and Figure A2-5. In this case, we can try to increase “Brightness balance adjustment” to the positive range for Figure A2-7 using the settings shown in Figure A2-9, or apply “Enhancement Mode High” for Figure A2-8 using the settings shown in Figure A2-10 to get a clearer picture quality.

Figure A2-4: Original

Figure A2-5: Visibility Enhancement applied


Figure A2-6: Settings used in Figure A2-5

 Figure A2-13: You can mask out the upper half part of the picture to apply Visibility Enhancement for the lower half part. The advertisement paper is clearer and the other part appears the same as in the original video.

Figure A2-13: Masking area for Visibility Enhancement

Moving Light Source in Low Light Environment

Example A3-1 (Outdoor Situation) Figure A3-1 shows a car running in a low lighting environment. This is the original picture that has not been applied with Visibility Enhancement. Figure A3-2 was applied with Visibility Enhancement and “Brightness balance adjustment” was set to the positive range above zero using the settings shown in Figure A3-3. The digits of the car plate and the shape of the car in Figure A3-2 is clearer than Figure A3-1.

Figure A3-1: Original

Figure A3-2: Visibility Enhancement applied


Figure A3-3: Settings used in Figure A3-2

4. Backlighted Environment

Example A4-1（Indoor Situation） In Figure A4-1, the sunlight spreads through the French windows behind the camera and there is another light source through the window just above the cabinet. Figure A4-1 is the original picture; Figure A4-2 was applied “Visibility Enhancement” and “Brightness balance adjustment” was set to a positive range above zero using the settings shown in Figure A4-3. The back lighted area in Figure A4-2 is more visible than in Figure A4-1.

Figure A4-1: Original                               Figure A4-2: Visibility Enhancement applied


Figure A4-3: Settings used in Figure A4-2 

Example A4-2（Outdoor Situation  The left image in Figure A4-4 is the original picture, where the camera was facing towards the sunlight in a certain angle and position. The picture captured by the camera looks a bit dark even though the sunlight was shining directly on the street in the actual scene. The right image in Figure A4-4 was applied with Visibility Enhancement using the settings shown in Figure A4-5; the right image is almost recovered back to the actual scene.


Figure A4-4: Camera placed in a back lighted environment

Example A5-1（Outdoor Situation） Figure A5-1 is the original picture, where the camera was facing the sunlight and the car was running. The contrast in Figure A5-1 is weak due to overexposure. Figure A5-2 was applied with “Visibility Enhancement” and the “Brightness balance adjustment” value was set in the negative range below zero using the settings shown in Figure A5-3; the contrast in Figure A5-2 is higher than in Figure A5-1

Figure A5-1: Original

Figure A5-2: Visibility Enhancement applied


 
How to Apply Visibility Enhancement.... Table 2 illustrates Visibility Enhancement solutions for different environmental situations. Please refer to the table below for guidance if this is your first time to use the Visibility Enhancement feature.

Environmental Situations

Solution 1

Solution 2

Indoor Situations

Outdoor Situations

1. Low Lighting Environment

1. Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

 

    Example A1-1

    Example A1-2

2  Fixed Light Sources in Low Lighting Environment

1. Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

2. Enable the “Brightness balance adjustment” option and adjust its value.

3. If the video quality is not good enough, enable the “Enhancement mode” option.

1  Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

2. Mask out the area nearby light sources to exclude that area when applying the Visibility Enhancement effect. On the other hand, if you want to get a better result within the area of the light sources, select the area where to apply the Visibility Enhancement effect.

    Example A2-2 for solution 1

 

    Example A2-3 for solution 2

 

    Example A2-1 for solution 1

 

3  Moving Light Sources in Low Lighting Environment

1. Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

2. Enable the “Brightness balance adjustment” option and set the value in the positive range.

3. If the video quality is not good enough, enable the “Enhancement mode” option.

 

 

    Example A3-1

 

4  Back lighted Environment

1. Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

2  Enable the “Brightness balance adjustment” option and set the value in the positive range.

 

    Example A4-1

 

    Example A4-2

 

5. Overexposure in Lighting Conditions

1. Apply “Visibility Enhancement” and adjust the “Visibility Enhancement level” value (setting the value to 6 or lower is recommended).

2. Enable the “Brightness balance adjustment” option and set the value in the negative range.

 

 

    Example A5-1

 

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