1. Horizontal or Vertical Bands with Scrolling Motion on the Monitor Screen
These anomalies, often referred to as 50Hz power frequency interference, are usually the result of improper grounding between the front-end and control center equipment, causing potential differences that form loops entering the video surveillance system. They can also stem from a decrease in the equipment's power performance.
2. Presence of Snowflake Noise in the Image
The presence of snowflake-like noise in video images is primarily caused by signal attenuation along transmission lines and interference from high-frequency noise.
3. Image Ghosting
Ghosting effects in video images, whiteouts, character jitter, or the appearance of evenly spaced vertical lines on the monitor screen typically result from impedance mismatches. This occurs when the impedance of video transmission lines or equipment does not adhere to the 75Ω standard.
4. Diagonal Striped Interference, Jumping Interference, and Power Interference
These interference types can lead to image distortion, ranging from mild to severe. Various factors contribute to these disturbances, including poor quality of video transmission lines, especially those with inadequate shielding performance. Other culprits include interference from power systems' harmonics and the presence of strong nearby interference sources.
5. Large-Scale Grid Interference, Also Known as Single-Frequency Interference
Grid interference typically arises due to short circuits or open circuits in the core wire or the shielding net of the video cable. It can also be attributed to poor contact at the BNC connectors.
When confronted with video interference issues on-site, it's crucial to classify the interference into one of the above categories. This initial categorization assists in pinpointing the likely causes and, subsequently, resolving the interference problems.
These anomalies, often referred to as 50Hz power frequency interference, are usually the result of improper grounding between the front-end and control center equipment, causing potential differences that form loops entering the video surveillance system. They can also stem from a decrease in the equipment's power performance.
2. Presence of Snowflake Noise in the Image
The presence of snowflake-like noise in video images is primarily caused by signal attenuation along transmission lines and interference from high-frequency noise.
3. Image Ghosting
Ghosting effects in video images, whiteouts, character jitter, or the appearance of evenly spaced vertical lines on the monitor screen typically result from impedance mismatches. This occurs when the impedance of video transmission lines or equipment does not adhere to the 75Ω standard.
4. Diagonal Striped Interference, Jumping Interference, and Power Interference
These interference types can lead to image distortion, ranging from mild to severe. Various factors contribute to these disturbances, including poor quality of video transmission lines, especially those with inadequate shielding performance. Other culprits include interference from power systems' harmonics and the presence of strong nearby interference sources.
5. Large-Scale Grid Interference, Also Known as Single-Frequency Interference
Grid interference typically arises due to short circuits or open circuits in the core wire or the shielding net of the video cable. It can also be attributed to poor contact at the BNC connectors.
When confronted with video interference issues on-site, it's crucial to classify the interference into one of the above categories. This initial categorization assists in pinpointing the likely causes and, subsequently, resolving the interference problems.
