Many manufacturers praise Full HD (1,920 x 1,080 pixels) on their surveillance cameras. During our tests, we were able to verify that this characteristic did not necessarily suggest good image quality.
In our various tests, many surveillance cameras offer image definition in Full HD (1,920 x 1,080 pixels). But comparing a few products with similar characteristics, you realize that the image quality is not always the same. In question, the choice of components, but also the processing of images by software integrated into the devices.
For example, wired outdoor surveillance cameras, like the Ezviz C3W 1080p and the Kami Outdoor Security Camera , have 1 / 2.7 inch sensors, which is equivalent to those found on some smartphones.
Choosing such a sensor size obviously does not offer as good an image quality as on some professional cameras. Indeed, the smaller a sensor, the higher the density of aligned photosites (small area of an electronic sensor that captures light). These photosites then have less room to capture a large amount of light. Ultimately , this can therefore lead to a loss of quality.
In addition to this loss, the larger a sensor, the heavier it will be and the higher its price. We therefore understand why the manufacturers opt for this type of component (1 / 2.7 inches), because their devices must remain compact, light and affordable – as much as possible. And if these small sensors are coupled to a poor quality lens, it is normal that the result is not there.
First of all, it is essential to understand that manufacturers are subject to quite significant constraints. Indeed, their products must be compact and weatherproof (with robust shells which can be thick, in particular). As a result, the space allocated to the sensors, in particular, is quite limited. This can therefore affect the size and / or quality of the on-board components.
Another parameter must be taken into account to clarify these quality differences for a similar definition: the image processing software used by the manufacturers. Some manufacturers will, for example, increase the contrasts to give an impression of more defined details. Only problem with this process, the elements in the darkest or brightest areas are less visible.
In order to maintain good image quality, adding an HDR mode can sometimes be a bonus. As a reminder, HDR (for High Dynamic Range) is supposed to avoid the presence of burnt or clogged areas on images, while