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  • Aperture application bottlenecks solution of surveillance camera

        Today, security surveillance camera´s role in our daily life is growing, therefore, natural for the discussion of the performance of the surveillance camera has become the main way to enhance the quality of work. However, in discussion, tend to focus on more high-definition, resolution seems in addition to these, high-quality video surveillance effect and we insulated. Well, today, we came together to talk about shooting for monitoring the impact of aperture.
        Aperture and depth of field
        Speaking of Aperture, I am afraid a little familiar with the digital effects friends basically there will not be too many strange feeling. Conceptually speaking, the role of the aperture to control the light passing through the lens, a device to adjust the amount of light inside the fuselage. Constructed by the lens inside the polygon or circular to the amount of light control. Generally, we use the F value to express the size of the aperture.
        In the day-to-day in, we will aperture with 1.0, 1.2, or 1.4, this is a manifestation of the size of the lens aperture F value is smaller, the greater the amount of light sensor chip is naturally aperture becomes larger.
        Finished the aperture, we say that the depth of field. The depth of field is in the space of a certain length in front of the lens, when the subject is located in this space, and its imaging on the backsheet is located just between the two dispersion circle around the focus. During the length of the space where the subject is called depth of field. Straightforward, is clear to fuzzy distance. If the larger the aperture, the depth of field will be nearer; while the smaller the aperture, depth of field will become more long-term. Accordingly, in such a relationship, when the full aperture to light through more open, the monitoring effect of the smaller aperture of the device it will become better. This is also a high-resolution lens imaging results, but not as good as low-resolution lens effect most reasons.
        The relationship between the iris and the lens
        Today, in order to improve the sharpness of the video surveillance camera imaging, more and more devices have begun to replace the CCD sensor CMOS sensor, CMOS compared to CCD sensitivity defects, but it is a headache so many manufacturers and users place. So, a lot of products in order to solve the problem of the CMOS light sensitivity better than CCD, CMOS camera DC interface is set in the aperture directly open to the maximum, or 2 to 3 file level according to the intensity of light points automatically adjust. Therefore, when the guaranteed amount of light, the effect of the lens is the most unsatisfactory.
        Especially for surveillance camera, its focus on working time is often different from the digital camera, dim night light imaging products such an important moment. Work, although sometimes a different amount of light aperture only difference with a small gap. But after a stream processing, this gap will infinite amplification, thereby to bring a very large impact on the monitoring results, storage areas, and the whole system. Therefore, in the lens configuration and testing, in addition to the day-to-day monitoring evaluation work results in night vision environment is also very important.
        Be seen from the above, the impact of the size of the aperture for monitoring quality is still very obvious. However, how to get out of this predicament?
        For the solution of this problem is not a how complex things. In use, we can set the aperture of the CMOS sensor camera at the maximum state, and configure the appropriate manual iris. In this case, even if all aperture open the drawbacks, we can through the tiny aperture adjustment, so as to enhance the overall performance of the lens.
        Furthermore, when we consider the monitor camera, it is best to collect a variety of high-end brands of camera, and in contrast, the reduction rays adjust to the state during the day is not too much affected; addition, the choice device, also preferably using the aperture of the plurality of blades, thus ensuring a better image quality.