Surveillance cameras clearly understand that there is no longer a problem

If you are not a person in the security industry, you may not know how different a surveillance camera is; if you are a purchaser of a security product, do you know how different the surveillance camera is? In the security industry, there is always a problem of "virtual standards". How serious is this problem, and is there any possibility that manufacturers will fool users? Immediately, I tested two different brands of domestic cameras.

Test Equipment: Two domestically-made different brands of surveillance cameras with infrared night vision red, 6mm fixed-focus lenses, 420 lines of horizontal resolution, two optical transmitters and necessary monitors.

Test purpose: Through this test, let the consumers clearly know that in the two different brands of domestic surveillance cameras, the product imaging effect in the end what is the difference, whether there is a virtual phenomenon.

In the current security market, high imitation of products and products are common occurrences. Although we cannot measure the presence or absence of a problem with a camera by using the parameter criteria, consumers may wish to pass simple test equipment before purchasing the product. When you test it, you know what you are doing.

When users decide to purchase surveillance cameras, they must first look at their appearance, manual craftsmanship and the camera's texture. The following figure shows the two surveillance cameras for this test. From the texture point of view, the dark grey surveillance camera (No. 1) is more delicate in its workmanship, and the silver-gray surveillance camera (No. 2) is relatively rough in its workmanship, especially the upper guard is still slightly loose.

In terms of volume, the No. 2 surveillance camera looks a little bigger, but its weight is not as heavy as the No. 1 surveillance camera. Obviously, the difference in product material is very obvious. Looking at the appearance of the two surveillance cameras, the degree of difference between the two indicators: ★ ★ ★ (the higher the difference between the higher the star).

After testing the appearance, we next compare the monitoring effect. In this test, the author found a very obvious problem. When the two surveillance cameras were switched on, within 15 seconds after the power was turned on, there was a significant difference in the imaging results. The No. 1 surveillance camera's initial image has clear colors and can have a distinct difference in gradation. The No. 2 surveillance camera can't initialize the imaging effect. If it is not carefully distinguished, it gives the impression that there is a black and white imaging effect. Obviously, in the same test environment, there is a clear difference in the initial image of the surveillance camera.

The following figure is a good illustration of the imaging effect of the No. 2 surveillance camera during the moment of switching on, during the monitoring process and at the end of the monitoring period. Due to the large difference in images, it is not difficult to determine the image stability of the surveillance camera.

Of course, there is no clear comparison between the two surveillance cameras with the same level of definition, and it is obviously fair to lose the experiment. Next, the author will answer the questions in the form of pictures.

The above two images can be seen that in the image brightness and image contrast, the No. 2 surveillance camera image has a grayish feeling and the overall monitoring effect is dark. In the absence of special low-light features, there is a clear difference between the two images in the imaging color.

If the user feels that the image is bright or dark, it cannot be used as a criterion for judging whether the surveillance camera is "good" or "bad". Therefore, it is believed that the apparent color reproduction degree can give a clear analysis. The following figure shows the restoration images of two surveillance cameras capturing natural objects such as red, black, and green.

From the comparison of the three pictures, the difference in color reproduction of the two monitor probes can be clearly distinguished by the naked eye. Obviously, in the case of the horizontal resolution of 420 lines, there is a clear difference in the imaging effect after monitoring the capture. The degree of difference between the two indices: ★★★★ (The higher the star rating, the greater the difference).

In summary, we can clearly see through this test that there are obvious differences in the effects of the two almost identical surveillance cameras. Although there is a certain error in the experiment, there is indeed a clear difference in the surveillance camera imaging effect, and the fact that the product is invisible is not broken! Perhaps, security industry standards also need to be unified, improve product standards, so that products are real and reliable.