Camera component analysis

Lens: The lens of the camera is undoubtedly the "eye" of the entire HD security monitoring system. From the perspective of the picture-oriented perspective, the horizontal resolution of HDTV cameras in the analog era can be higher than 480 lines. For digital cameras, the resolution needs to be maintained at 1.3 million or 720p or higher. Camera. Based on this, the higher the resolution, the clearer the picture and the higher the quality. Commonly referred to as CIF and D1 belong to standard definition ranks, while 720p, 1080i and 1080p belong to high definition. Even in recent years, 4k technology has gradually matured. Become a security epoch pk highlights. However, strictly speaking, in view of the industry standards in the field of security monitoring, the definition of high-definition lenses is more stringent and complicated, and megapixels cannot represent “high definition”. Taking a CCD as an example, the 380--480 line is a color “high-definition” screen. During daily monitoring, 400 or so black-and-white cameras (low-line CCDs) can complete tasks, even for military, medical, and other purposes, with 600-line cameras. The picture is also sufficient to meet the requirements, but the camera with the highest horizontal resolution of 700 lines has only 550,000 pixels and does not reach the so-called megapixel.

In 2006, the IPC of a 1.3 megapixel high-definition network was launched, which triggered a high-definition storm in the industry and promoted the industry-recognized HDTV standard (for high-definition definition, only 720p, 1080i, and 1080p are compatible formats).

Filters: Used for color CCD filtering and trimming received light. In the black and white camera is not required, therefore, the filter is a simple component has become a color high-definition vision era, the necessary means to enhance high-definition network camera technology.

Image sensor: simply refers to the photosensitive imaging device. It can be said that whether the front end captures the key factor of “high-definition” image restoration is divided into two major categories: CCD and CMOS. Everyone is no stranger to SONYSTARVIS sensor. Sony will undoubtedly become the largest and most famous manufacturer of photosensitive components in the security industry. The evolutionary history of its six-generation image sensors will invariably influence the progress of HD camera technology in the security industry. In recent years, Sony is more interested in the use of CMOS than CCD, so it is necessary for us to analyze both of them. From the aspects of the number of pixels, sensitivity, signal-to-noise ratio, stability, response speed, and low distortion of the image, the CCD is undoubtedly the best choice, but the CMOS has the characteristics of low power consumption, low cost, and no effect. , on the basis of overcoming the inherent weaknesses favored by everyone, may become the mainstream product in the field of image sensors. Sony STARVIS sensor is a kind of CMOS sensor with excellent experience. It does not require external power supply, controllable cost, and features of high-definition restored images under low illumination. Sony's first-generation Exmor sensor, using the first conversion signal, noise reduction form, for traditional sensors, noise problems greatly improved; second and third generation Exmor to solve the problem of blue-green and other short-wave light easily missed, reducing the sensor's The thickness is achieved by replacing aluminum wire with copper wire, which improves the receiving and processing capabilities of light and saves most of the space for other structural improvements that can improve HD video camera technology; the fourth generation solves the problem of receiving long-wave light by increasing The width of the photodiode enhances the processing capabilities of long-wavelength light that is close to infrared light; the fifth-generation image sensor is often referred to as a BSI sensor. Unlike previous generations, it adjusts the position of the photodiode to the rear and can be described as “back-illuminated”. The sensor reduces the noise of the circuit noise. The upgrade of the sixth-generation sensor is reflected in the structure. The new stack-type structure provides a higher pixel-lifting space, but it has a tighter and compact size. The lens and the camera body can be connected. evolution. In this era of mobile phone photography, it is obviously more suitable. Generally speaking, CMOS is mostly used in the low-end camera field, and high-end markets with high-quality images require CCD sensors. However, as technology advances step by step, the optimization of CMOS is also very smooth. In the future, it will be highly possible to completely replace CCD, and it will become the core guarantee for the next generation of high-definition network camera technology.