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IEC/EN 62676-4: 2024 OODPCVS support

New Standard Proposal for Video Surveillance: IEC/EN 62676-4: 2024 OODPCVS

The introduction of the new standard IEC/EN 62676-4: 2024, also known as OODPCVS, marks a significant advancement in the field of video surveillance. This standard establishes more realistic minimum pixel densities for various object sizes, taking into account the modern digital IP cameras’ capabilities and constraints, such as compression and noise.

The previous version of this standard is known as EN 62676-4: 2014 has been supported by IP Video System Design Tool in 2016.

OODPCVS

Pic. 1 Visualization of camera zones in IP Video System Design Tool 2024 (build 2255)

Object Size Definitions and Pixel Density

The updated standard categorizes pixel densities into two main groups: Low Pixel Density Object (LPDO) and High Pixel Density Object (HPDO). This categorization is based on practical tests conducted with contemporary surveillance cameras equipped with various sensors and pixel resolutions under different illumination levels.

Group name Category Pixel densities (Pix/m)
Low Pixel Density Object O/O/D 20/40/80
High Pixel Density Object P/C/V/S 125/250/500/1500

Low Pixel Density Object (LPDO)

  • Overview: To display moving objects at far distances, a minimum of 20 pixels per meter (pix/m) is required. This allows for basic perimeter detection and border control applications.

    • Overview Zone

  • Outline: For outlining moving objects and their direction, at least 40 pix/m is necessary. This is useful for tracking object movements.

    • Outline Zone

  • Discern: To discern targets or crowds at a distance, more than 80 pix/m is required. This level of detail helps in identifying movements of people, vehicles, or animals.

    • Discern Zone

High Pixel Density Object (HPDO)

  • Perceive: To perceive targets or crowds, a minimum of 125 pix/m is required. Although people cannot be differentiated by gender, their movements can be tracked.

    • Perceive Zone

  • Characterize: Characterizing people and vehicles requires more than 250 pix/m. This level allows for identifying person type, gait, behavior, and vehicle category.

    • Characterize Zone

  • Validate: For validating known persons or reading vehicle license plates, over 500 pix/m is necessary. This is also sufficient for most automatic face recognition software.

    • Validate Zone

  • Scrutinize: To scrutinize people, capturing at least 1500 pix/m is essential. This ensures high certainty in identifying individuals and recognizing vehicle details like model and year of manufacture.

    • Scrutinize Zone

Practical Implications

The new standard draws from the ISO/IEC 19794-5 and ISO/IEC 29794-5 standards and integrates findings from practical tests. Special attention was given to details at lower illumination levels, and the impact of compression was also considered. The standard ensures that video surveillance systems are equipped to handle real-world scenarios more effectively, providing higher accuracy and reliability.

Conclusion

The IEC/EN 62676-4: 2024 (OODPCVS) standard represents a considerable step forward in video surveillance technology. By establishing clear guidelines for pixel density based on object size and application, it ensures that surveillance systems can deliver detailed and accurate imagery, enhancing security and monitoring capabilities.

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This article is written by:

July 8, 2024