Camera placement in the company: blind spots and useful frame
A blind spot is not always outside the image, because a camera can cover a given place and still fail to record the detail needed to explain an incident. We describe how to turn the purpose of monitoring into a task for each camera, identify fixed and changing obstructions and check the layout before acceptance.
A typical situation after an incident: the recording exists and the camera covered the entrance, but the person's figure takes up a few pixels in the frame and the light from the glazed doors burns out the background. Formally the CCTV worked, in practice nothing can be established from it.
Disclaimer. We describe the technical side of camera placement and framing. Establishing the legal basis, the permitted scope of observation and the information obligations requires a case-by-case assessment by a lawyer or data protection officer. This is not legal advice.
The blind spot isn't always outside the picture
The most obvious blind spot is the place that no camera covers, but in practice, the visible zone from which the necessary information cannot be obtained is equally important.
A character can be in the frame but take up too little space, a car can block an entrance, and strong light can turn details into a dark silhouette. Each of these cases means that monitoring is not fulfilling the task, even though the image formally exists.
Therefore, the assessment of layout should not end with checking whether the entire room or area can be seen, because it is also necessary to determine what can be recognised and under what conditions.
One main task for each camera
Planning starts with writing down the goal for each point so that the camera doesn't try to simultaneously show the entire object and capture detail in a distant part.
| Task | Consistency for the frame |
|---|---|
| Situation picture | wide view showing the event |
| Person recognition at the door | tighter frame set for a specific route |
| Observation of the entrance | frame subordinated to the vehicle movement path |
| Production monitoring | a view covering the work area and the course of the process |
These goals may require different points because a wide image spreads the available detail over a larger scene, while a narrower frame shows less terrain but better highlights the selected area.
By assigning one main task to the camera, it is easier to evaluate its effectiveness later, because the reception then answers a specific question, not a general "can you see anything?"
Field of view and lens choice
Angle of view is not a parameter that should be maximized because a wider frame always means that the same image covers a larger scene.
The choice of lens should depend on the width of the observed area, the distance from the scene of the event, the expected detail and lighting conditions. Without this information, the data sheet will not tell you whether the camera is correct, even if the manufacturer provides all the parameters.
When designing the frame, it is worth using the preview from the planned installation site, because the drawing will not show the actual impact of the column, recess, eaves or equipment elements.
Continuous coverage along movement routes
Monitoring should make it possible to track an event between zones, therefore the placement of cameras is also assessed along typical entry, exit, transit and goods transfer routes.
If a person disappears between two frames, a gap appears in which nobody knows where they went or what they did, even though both ends of the route remain visible. The solution may be to change the direction of an existing camera, split the tasks differently or add another point, and it is worth basing the decision on an on-site test.
Overlapping frames makes sense where it ensures continuity of observation, but should not lead to repeated recording of the same empty space at the expense of important areas.
Fixed and variable obstacles
Structural elements such as columns, corners, hoods and shelving can be considered during design, but a greater challenge is obstacles that only arise during normal operation.
A parked car, a delivery left at the dock, growing vegetation or a changed storage arrangement can obscure an area that was visible during pickup. When analysing the environment, you need to ask not only about the current state, but also about typical traffic and planned changes.
A camera observing the space above the shelves may give the correct image of an empty hall, and when the warehouse is full, lose the view of the level where people are working.
Mounting height and direction
Mounting high protects the device from accidental damage, but may change the perspective so that the image mainly shows the tops of heads instead of useful features of the characters.
A camera mounted lower, on the other hand, gives a better angle for certain tasks, although it requires an assessment of the risk of tampering and of whether the cable can be run safely. When choosing the height, you have to balance physical resilience with what needs to be recorded.
The installation direction should also take into account windows, gates and lamps, because strong background light can strip the silhouette of details exactly in the place that was supposed to be the most important.
Camera acceptance by day and by night
Daytime shots can become unusable after dark when the illuminator reflects off a nearby surface, insects appear near the device, or the lamp changes exposure when it moves.
Therefore, each point must be tested in real night conditions, following the same route that was tested during the day. The problem of quality after dark is described separately in the article about camera image at nightto avoid mixing frame selection with lighting diagnostics.
Observation range and zone masking
A camera may technically cover more than the declared purpose requires, and it is worth excluding the excess area from the recording. The European Data Protection Board cites systems that allow areas irrelevant to surveillance to be masked as an example of privacy-friendly solutions.
Privacy mask allows you to cover a selected part of the image, while the detection zone only decides from which area events and notifications should come. The distinction is important because turning off alarms from part of the frame does not remove it from the recording itself.
For monitoring carried out by an employer, Art. 22² of the Labour Code as a rule excludes toilets, changing rooms, canteens and smoking rooms, as well as rooms made available to the workplace trade union. The exceptions are strictly defined, and the provision also requires the monitored area to be visibly marked no later than the day before it starts. The scope of observation therefore has to be set together with a legal assessment of the specific site, and at acceptance you should check that the masks and camera directions match the approved arrangements.
How to determine the location of cameras in the company
- Compare each camera's live view with the task recorded for it.
- Walk the typical routes of people and vehicles, watching for points where continuity is lost.
- Introduce typical obstacles into the scene, such as a vehicle, goods or an open door.
- Repeat the test in difficult daylight and after dark.
- Check that the privacy masks cover the right areas.
- Check that the monitored area is marked.
- Record the direction, task and scope of each camera in the documentation.
This list checks whether the recording shows what the business needs.
Dead spots also occur after receipt
The environment changes after implementation, so the review should take place after reconstruction, change in storage method, installation of a new shelter, change in lighting or other modification affecting the staff.
Documentation indicating the purpose of each camera then allows you to quickly recognise whether a change has violated the system's purpose, rather than reproducing the original assumptions from memory.
How we do it
We start with the purpose of each zone, then choose the framing, direction and mounting point, checking obstacles and typical routes on the site. We do not carry out legal assessments. We prepare a technical description of the scope of observation, masks and recording method that a lawyer or data protection officer can use. We discuss the recording retention period separately in our article on retention of surveillance recordings.
After implementation, we perform day and night tests and provide documentation, and monitoring can be covered by constant supervision, including recording efficiency, device condition, updates and periodic staff review.
We combine CCTV with power, segmentation and documentation as part of building and maintaining corporate networks.
Sources
- Chancellery of the Sejm, Act of 26 June 1974, the Labour Code (Kodeks pracy), Art. 22² (consolidated text Journal of Laws (Dz.U.) 2025 item 277, as amended), https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU19740240141 (accessed 02/10/2026)
- European Data Protection Board, Guidelines 3/2019 on processing of personal data through video devices, adopted 29.01.2020 (version 2.1 of 26.02.2020), paragraph 129, https://www.edpb.europa.eu/our-work-tools/our-documents/guidelines/guidelines-32019-processing-personal-data-through-video_pl (accessed 02/10/2026)
As of 2 October 2026.