High-definition surveillance camera for megapixel competition

In the face of the ever-changing security monitoring product form and application scenarios, millions of high-definition surveillance cameras must have excellent image quality under complex light conditions in various scenarios. From the development of the megapixel lens over the past year, we can see that the market demand for lens elements with higher pixel demand and higher light transmittance has stimulated the gradual transition from megapixel lenses to 2 million and 3 million. The 5-megapixel HD megapixel lens has become overwhelming. High-definition lenses are fierce, and millions of companies are competing.

Four major developments in high-definition lens ferocious

High definition

Two important indicators of sharpness include resolution and contrast. Resolution refers to the ability of the lens to reproduce the details of the scene being photographed. The higher the resolution, the clearer and sharper the picture. Contrast refers to the ability to reproduce the low-contrast details and light-dark levels of the scene. The higher the contrast, the sharper the outline of the scene and the sharper edges. Rich levels, strong texture, bright tone. The lens with high resolution and low contrast, the image outline is not clear, the contrast is dark, and the tone is flat, which makes people feel anti-unclear. Many domestic cameras are like this, and many manufacturers promote millions of high-definition lenses, but there is not much difference with the standard definition lens, which is the reason for the market's lukewarm. The resolution of some lenses is not high, but the contrast is large, but it gives a good feeling of this lens. So when the contrast and resolution reach a certain height, it is the real ideal million HD lens.

Large diameter miniaturization

The large diameter refers to the amount of light transmitted by the lens, which is mainly reflected in the brightness of the screen. Compared with the small-aperture lens, it has a better performance in the environment dim and night mode. Miniaturization means that the lens has a compact structure that can be applied to different product installations and reduce the size of the product. Compared with megapixel surveillance cameras abroad, the application of aspheric technology is mature, often with the same lens, which has a focal length, a large aperture, a small structure, and high definition. Most of the major lens manufacturers in China are slowly exploring aspheric technology and strive for the early development of new products that are applied to megapixel surveillance cameras to compete with foreign manufacturers.

Day and night are not defocused

Under the premise of ensuring the quality of the daytime, the user's requirements for nighttime image quality are also getting higher and higher. ED (low refractive index high dispersion coefficient) glass can be used to better correct the color difference and improve the confocal ability and image of day and night imaging. quality. In recent years, major glass manufacturers have also tried to promote ED glass.

Stray light elimination

Miscellaneous light mainly includes stray light and ghost images. Stray light refers to the rainbow-like stray light caused by the reflection of mechanical components. Stray light can be perfectly eliminated by the extinction treatment of the inner wall of the lens and spacers. The ghost image refers to the secondary imaging of light reflected multiple times between the lens inside the lens. The ghost image is similar to the outline of the light object and cannot be completely eliminated. It can only be reduced by plating the multilayer antireflection film. A high-definition multi-million surveillance camera with comprehensive performance, which should have excellent performance in the elimination of stray light, can perform well in a strong light environment and match the reputation of its million HD surveillance cameras.

Nowadays, the corresponding 2/3′′CCDs in the lens market can reach 5 million pixels, 1/3′′ CCD and 1/2.5′′ CMOS can reach up to 3 million pixels, and the available lens products are very rich. In the environment where the domestic aspherical technology is not yet mature, lens manufacturers should maintain an ever-increasing R&D attitude toward aspheric technology, and make full use of optical glass such as high refractive index and low dispersion coefficient and ED (low refractive index and high dispersion coefficient). To correct the aberrations of the lens, improve the lens performance stability and cost performance, and combined with heat sealing and pressure lens packaging technology will be mature applied to millions of high-definition products, making it more compact HD.

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