Affects the monitor image sharpness element sensor

A high-resolution surveillance camera can provide more pixels, but it is not known whether the multi-pixel image can be fully rendered or the exacting requirements of the high-resolution camera for monitoring components. The choice of components of the surveillance camera directly affects the performance of the camera, and today we discuss the story of high-definition picture quality and camera components.

The relationship between the sharpness of the monitoring image and the sensor is inextricably linked, and the relationship between the size of the image sensor and the number of pixels seems to exist. According to common sense, the larger the sensor size, the higher the resolution or resolution of the image; at present, most sensors on the market are 1/3-inch CCD or CMOS. As for the difference between CCD and CMOS, I will not say more here. To pursue high quality, CMOS is really the best choice.

I once did a surveillance camera test, regardless of the image resolution is 1280 * 720 or 1280 * 960, 1/3-inch CMOS sensor generates an image of about 1.3 million pixels; 1/2 sensor generated images of 2 million or 3 million pixels Some can reach up to 5 million. Obviously there is a fixed ratio between the size of the image sensor and the number of pixels.

In testing, an extremely unusual feature of the image sensor was also discovered. If the sensor is not aligned, the resulting image is naturally blurred. Under normal circumstances, people will constantly adjust the position of the sensor lens, so that the camera generates a clear image. In fact, this can only prove that the installation process has a problem, but have you seriously thought that when selecting a camera, Other components have important significance for image quality?

The same sensor with different image results

The same sensor can produce completely different images for the same decoder chip. Each security company and its own choice of components and standard colors, in addition to image sensors, also includes a compression chip, image sensor processor (ISP) for image correction and power control. Buying a new camera has almost no difference in appearance, but internal SoC decoding plays a crucial role.

Different home video cameras can choose different decoding chips, and most high-end brands will choose reputable SoC chips. In China, there are no shortages of companies that choose to use second-hand or counterfeit chips in order to control costs. Of course, users cannot judge with the naked eye within a short period of time. There is no doubt that the quality of products over time will be exposed.

Different cameras use the same sensor, and the image effects produced by the decoder and ISP are also different. Even if the same components, the camera's backlight compensation and wide dynamic range performance is also different, this feature, the author has been interpreting in the Hengping surveillance camera. With the same surveillance camera, the effect of wide dynamic on and off images varies greatly.

Many people believe that the ISP software development kit is not open enough, resulting in uneven image performance. In fact, from another factor, perhaps the R&D cost budget of the company is limited, and the complementary codec cannot meet the efficiency of image processing. Some sensor vendors retain their strength and do not share sensor technology; for device manufacturers, they should strengthen the R&D team's strengths and overcome the performance limitations imposed by sensors.

Whether it is a surveillance camera or a home camera, the sensor overlord is still Sony. Of course, the technical level of different sensor manufacturers will also be different, perhaps the same price, the effect of different manufacturers of sensors is also very different. For camera manufacturers is undoubtedly a huge blow. No one company has its own right of choice. No matter whether it is good or bad, no one can control it. Objectively speaking, cameras in the practical application will appear some differences, and camera components are used to make up for differences and achieve the best monitoring results.