The demand for high-definition security has become a trend. The visual effects brought by high-definition cameras are unmatched by analog products. With the development of high-definition, one million HDTV lenses, one of the core components, have also demonstrated high-speed market growth. However, in the face of various forms of high-definition surveillance products and ever-changing application scenarios, millions of high-definition surveillance cameras are complex in various scenarios. In the light environment, it is necessary to bring excellent imaging results to the camera, which requires high-definition surveillance lenses with a certain technical content.
Lens technology application trends
For the security industry, the Million HD surveillance camera is a lens that has high definition (high resolution) and can match at least 1 million pixels high-definition cameras. Millions of high-definition surveillance camera application products cover hemispheres, infrared explosion-proof hemisphere, high-speed wisdom ball, medium-speed intelligence ball, bolt, infrared guns and so on.
For millions of high-definition surveillance cameras, the image quality of the screen is its fundamental, security monitoring product form and application scenarios are ever-changing, which requires millions of high-definition surveillance cameras in a variety of scenes of complex light conditions, have excellent imaging quality.
In terms of lens development, there are mainly the following aspects:
Aspherical technology Aspherical lenses are the current trend. Aspherical lenses can be used to achieve larger apertures and better night vision effects. Therefore, more and more lens manufacturers have introduced aspherical lens technology in new products.
High-definition IP cameras have a wealth of image algorithm applications, so the requirements for details of lens imaging are increasing. This is not only a lens upgrade from 1 million pixels to 10 million pixels, but also the need to increase the edge of the pixel at the same time, to ensure that the details of any position are clear and can stand up to zoom. The two important pointers for 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 contrasting details of the scene, the ability to light and dark levels, the higher the contrast, the sharper the outline of the scene, and the sharp 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. Some home-made lenses are like this, and the standard-definition lens is not much different in perception. 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, small-sized, large-caliber 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, the environment is darker and the night mode has a better performance. 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 in foreign countries, its aspheric technology is mature and often uses the same lens. Its focal length is sufficient, its aperture is large, its structure is small, and its definition is high. Most of the domestic lens manufacturers are still exploring aspheric technology, and strive to get mature as soon as possible and apply it to high-definition surveillance applications, competing with foreign manufacturers.
Day and night parcels in the intelligent transportation industry, the imager target is increasing, the use of 1 "CMOS products more and more, this type of product relative to 2/3" CMOS, has a better low-light effect. At present, many products do not have the function of night-vision parfocal. They need to rely on the flash to fill the light. At present, many countries do not allow the use of flash. There are many places in the country that have begun to discuss solutions without flash.
At the same time, under the premise of ensuring the quality of the daytime, the user's requirements for nighttime image quality are also getting higher and higher. It is possible to use ED (Low Refractive Index High Dispersion Coefficient) glass to better correct the color difference and improve the confocal capacity of day and night imaging. And quality. In recent years, major glass manufacturers have also tried to promote ED glass.
Stray light elimination stray light mainly includes stray light and ghost images. Stray light refers to the rainbow-like stray light caused by the reflection of the mechanical components, and the stray light can be eliminated by the extinction treatment of the inner wall of the lens and the spacer. The ghost image refers to the secondary imaging of multiple reflections of the light between the lenses inside the lens. The ghost image is similar to the outline of the light object and cannot be completely eliminated. It can only be weakened 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, and 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 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 with high refractive index, low dispersion coefficient and ED (low refractive index, high dispersion coefficient). To correct the aberration of the lens, improve 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.
Lens We are very familiar with security people, because we must always touch these things in our work. It is an integral front-end component of our security monitoring system installation work. The high performance of the monitoring system depends on the perfect match between the camera and the lens. In the monitoring project, if the user or construction staff lack of expertise, the camera and lens selection and installation are unreasonable, it will directly affect the overall effect of the system .
Camera lens does not work properly
Common causes of camera and lens failure:
1, camera and lens imaging size does not match the lens imaging size is greater than the camera chip size, normal imaging, but the lens field of view angle will be less than the nominal angle of view; but if the lens imaging size is smaller than the camera chip size, the monitor will be around the picture There is a dark corner.
2. The mismatch between the camera and the lens interface does not match the distance between the second group of points of the lens and the camera chip. The actual focal length is not the nominal focal length of the lens, resulting in inability to focus. The standard gun camera interface and lens interface should be the same as the C interface or the CS interface; the C interface lens must be attached to the CS interface camera must be added adapter ring; CS interface lens can not be installed on the C interface camera. The common gun type camera interface is usually designed as a CS interface, and it can be connected to a CS interface lens or an adapter ring to connect a C interface lens.
3, camera and lens aperture work drive or voltage mismatch Auto iris lens is usually divided into DC drive and video drive, the two work voltage is not exactly the same, this mismatch will cause the lens aperture can not be normally open, naturally it will not be able to Imaging. AVENIRETOKU Seiko engineers remind everyone that when using the auto iris lens, the aperture converter on the camera should be driven to the nominal drive side of the lens, and the output voltage of the camera should be within the working voltage of the aperture.
4. Connection problems, misconnections or loose connections The monitoring camera, the lens, and the monitor will have various connections (if the device is connected with a pan/tilt head and a controller), these connections will be wrong or loose. , It will also cause the system to not work properly. We also remind everyone to carefully read the instruction manual of the equipment before installation.
The main reason that causes the monitor image to be unclear:
1. Electronic Signal Interference The interior of the camera is a highly integrated system that is susceptible to interference from external electronic signals. If the monitor screen appears beating or streaking, the camera may be disturbed. Be careful to keep away from sources of electronic signal interference during installation.
2, the focus does not adjust the lens zoom adjustment to adjust the focus, in a certain depth of field (sometimes may be very small) can be focused clear, if you do not focus on the clear focus may not be adjusted to the best position.
3, dirty lens lens has dirt on the lens will directly lead to the monitoring screen blur, flu. AVENIRETOKU Seiko lens technicians remind everyone that the installation must be careful not to squeeze the ends of the lens by hand, so it is easy to leave fingerprints on the lens. In case the lens is stained with fingerprints or dust, be sure to wipe it with a special wipe instead of using a tissue, a soft cloth, or alcohol (it is easy to destroy the film on the lens surface).
4. Problems with the electronic shutter or white balance setting When the camera is shipped from the factory, the various adjustment devices are generally set at the optimal default position. If there is no special need, it is better to keep the default setting unchanged.
5, the back focus needs to adjust the so-called back focus (non-flange focal length), refers to the lens lens surface vertex to the focal plane distance. After the zoom adjustment, the screen is still unclear when the focus is adjusted to the optimal position (or the telephoto end of the lens is in focus and then the zoom is pushed to the wide-angle end to observe whether the wide-angle end screen is clear), which may be a problem of back focus.
Some cameras (or lenses) are equipped with a back-focus adjustment device, and some are controlled at a small range when leaving the factory. If there is no back-focus adjustment device and the back-focus problem is confirmed, the back-focus adjustment can only be added and added. Ring or replace the corresponding product.
6, camera or lens itself is not enough pixels The high performance of the camera depends on the perfect match between the body and the lens, the most important point is that the resolution is consistent. If you use a standard definition analog camera, even if it is equipped with a million HD lens, the displayed image is still not clear; on the contrary, if it is an ordinary camera with a high-definition camera, then the camera's megapixel can not be reflected.
Use good lenses to reduce maintenance costs
In security applications, because front-end devices are susceptible to environmental factors such as moisture, vibration, thermal expansion and contraction, etc., after a period of use, problems such as blurring, instability, and aging are easily caused by shifting the focus point. Therefore, the cost of system maintenance must also be taken into account during construction.
Lens technology application trends
For the security industry, the Million HD surveillance camera is a lens that has high definition (high resolution) and can match at least 1 million pixels high-definition cameras. Millions of high-definition surveillance camera application products cover hemispheres, infrared explosion-proof hemisphere, high-speed wisdom ball, medium-speed intelligence ball, bolt, infrared guns and so on.
For millions of high-definition surveillance cameras, the image quality of the screen is its fundamental, security monitoring product form and application scenarios are ever-changing, which requires millions of high-definition surveillance cameras in a variety of scenes of complex light conditions, have excellent imaging quality.
In terms of lens development, there are mainly the following aspects:
Aspherical technology Aspherical lenses are the current trend. Aspherical lenses can be used to achieve larger apertures and better night vision effects. Therefore, more and more lens manufacturers have introduced aspherical lens technology in new products.
High-definition IP cameras have a wealth of image algorithm applications, so the requirements for details of lens imaging are increasing. This is not only a lens upgrade from 1 million pixels to 10 million pixels, but also the need to increase the edge of the pixel at the same time, to ensure that the details of any position are clear and can stand up to zoom. The two important pointers for 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 contrasting details of the scene, the ability to light and dark levels, the higher the contrast, the sharper the outline of the scene, and the sharp 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. Some home-made lenses are like this, and the standard-definition lens is not much different in perception. 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, small-sized, large-caliber 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, the environment is darker and the night mode has a better performance. 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 in foreign countries, its aspheric technology is mature and often uses the same lens. Its focal length is sufficient, its aperture is large, its structure is small, and its definition is high. Most of the domestic lens manufacturers are still exploring aspheric technology, and strive to get mature as soon as possible and apply it to high-definition surveillance applications, competing with foreign manufacturers.
Day and night parcels in the intelligent transportation industry, the imager target is increasing, the use of 1 "CMOS products more and more, this type of product relative to 2/3" CMOS, has a better low-light effect. At present, many products do not have the function of night-vision parfocal. They need to rely on the flash to fill the light. At present, many countries do not allow the use of flash. There are many places in the country that have begun to discuss solutions without flash.
At the same time, under the premise of ensuring the quality of the daytime, the user's requirements for nighttime image quality are also getting higher and higher. It is possible to use ED (Low Refractive Index High Dispersion Coefficient) glass to better correct the color difference and improve the confocal capacity of day and night imaging. And quality. In recent years, major glass manufacturers have also tried to promote ED glass.
Stray light elimination stray light mainly includes stray light and ghost images. Stray light refers to the rainbow-like stray light caused by the reflection of the mechanical components, and the stray light can be eliminated by the extinction treatment of the inner wall of the lens and the spacer. The ghost image refers to the secondary imaging of multiple reflections of the light between the lenses inside the lens. The ghost image is similar to the outline of the light object and cannot be completely eliminated. It can only be weakened 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, and 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 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 with high refractive index, low dispersion coefficient and ED (low refractive index, high dispersion coefficient). To correct the aberration of the lens, improve 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.
Lens We are very familiar with security people, because we must always touch these things in our work. It is an integral front-end component of our security monitoring system installation work. The high performance of the monitoring system depends on the perfect match between the camera and the lens. In the monitoring project, if the user or construction staff lack of expertise, the camera and lens selection and installation are unreasonable, it will directly affect the overall effect of the system .
Camera lens does not work properly
Common causes of camera and lens failure:
1, camera and lens imaging size does not match the lens imaging size is greater than the camera chip size, normal imaging, but the lens field of view angle will be less than the nominal angle of view; but if the lens imaging size is smaller than the camera chip size, the monitor will be around the picture There is a dark corner.
2. The mismatch between the camera and the lens interface does not match the distance between the second group of points of the lens and the camera chip. The actual focal length is not the nominal focal length of the lens, resulting in inability to focus. The standard gun camera interface and lens interface should be the same as the C interface or the CS interface; the C interface lens must be attached to the CS interface camera must be added adapter ring; CS interface lens can not be installed on the C interface camera. The common gun type camera interface is usually designed as a CS interface, and it can be connected to a CS interface lens or an adapter ring to connect a C interface lens.
3, camera and lens aperture work drive or voltage mismatch Auto iris lens is usually divided into DC drive and video drive, the two work voltage is not exactly the same, this mismatch will cause the lens aperture can not be normally open, naturally it will not be able to Imaging. AVENIRETOKU Seiko engineers remind everyone that when using the auto iris lens, the aperture converter on the camera should be driven to the nominal drive side of the lens, and the output voltage of the camera should be within the working voltage of the aperture.
4. Connection problems, misconnections or loose connections The monitoring camera, the lens, and the monitor will have various connections (if the device is connected with a pan/tilt head and a controller), these connections will be wrong or loose. , It will also cause the system to not work properly. We also remind everyone to carefully read the instruction manual of the equipment before installation.
The main reason that causes the monitor image to be unclear:
1. Electronic Signal Interference The interior of the camera is a highly integrated system that is susceptible to interference from external electronic signals. If the monitor screen appears beating or streaking, the camera may be disturbed. Be careful to keep away from sources of electronic signal interference during installation.
2, the focus does not adjust the lens zoom adjustment to adjust the focus, in a certain depth of field (sometimes may be very small) can be focused clear, if you do not focus on the clear focus may not be adjusted to the best position.
3, dirty lens lens has dirt on the lens will directly lead to the monitoring screen blur, flu. AVENIRETOKU Seiko lens technicians remind everyone that the installation must be careful not to squeeze the ends of the lens by hand, so it is easy to leave fingerprints on the lens. In case the lens is stained with fingerprints or dust, be sure to wipe it with a special wipe instead of using a tissue, a soft cloth, or alcohol (it is easy to destroy the film on the lens surface).
4. Problems with the electronic shutter or white balance setting When the camera is shipped from the factory, the various adjustment devices are generally set at the optimal default position. If there is no special need, it is better to keep the default setting unchanged.
5, the back focus needs to adjust the so-called back focus (non-flange focal length), refers to the lens lens surface vertex to the focal plane distance. After the zoom adjustment, the screen is still unclear when the focus is adjusted to the optimal position (or the telephoto end of the lens is in focus and then the zoom is pushed to the wide-angle end to observe whether the wide-angle end screen is clear), which may be a problem of back focus.
Some cameras (or lenses) are equipped with a back-focus adjustment device, and some are controlled at a small range when leaving the factory. If there is no back-focus adjustment device and the back-focus problem is confirmed, the back-focus adjustment can only be added and added. Ring or replace the corresponding product.
6, camera or lens itself is not enough pixels The high performance of the camera depends on the perfect match between the body and the lens, the most important point is that the resolution is consistent. If you use a standard definition analog camera, even if it is equipped with a million HD lens, the displayed image is still not clear; on the contrary, if it is an ordinary camera with a high-definition camera, then the camera's megapixel can not be reflected.
Use good lenses to reduce maintenance costs
In security applications, because front-end devices are susceptible to environmental factors such as moisture, vibration, thermal expansion and contraction, etc., after a period of use, problems such as blurring, instability, and aging are easily caused by shifting the focus point. Therefore, the cost of system maintenance must also be taken into account during construction.
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