einstein optical

Puyi Eyewear was a high-end eyewear brand founded in Hong Kong. Its price was higher because it was of very high quality, and the materials and craftsmanship used were very exquisite. Pu Yi glasses were designed, produced, and sold by brand manufacturers, so the price was much more expensive than ordinary glasses. Pu Yi Glasses cooperated with many internationally renowned brands to provide high-quality products and services, as well as a luxurious experience. Its stores provided a personalised service, selecting matching styles for each customer, and providing a series of shopping experiences and VIP services. Mr. Qiu Zijie, the founder of Puyi Glasses, shared his experience and ideas in brand management, product selection, and service content. Pu Yi Glasses was based on the personalisation and advanced optometrification and eye protection technology, providing perfect answers for every pair of eyes. Puyi Glasses had been in the market for 18 years and had become the leader of the luxury glasses market.

The hood was a device installed at the front of the camera lens, digital camera, and video camera. It was an important part of the lens optical system. Its main uses included: 1. ** Suppression of stray light **: avoid glare and improve image clarity and color reproduction. In different light positions such as backlighting, side backlighting, forward lighting, side lighting, lighting photography or night photography, it can prevent non-imaging light, surrounding scattered light or interference light from entering the lens, avoid fog and halo phenomena, and improve the color saturation and clarity of the picture. 2. ** Protect the lens **: When the lens is accidentally dropped, it can help reduce the damage caused by the fall; it can prevent fingers from accidentally touching the surface of the lens; it can also block the sand, rain, snow, etc. to a certain extent to prevent other things from directly touching the surface of the lens. In terms of usage, the hood in front of all the lenses had been carefully calculated by the manufacturer to help improve the quality of the shot. If the lens was equipped with a crystallizer, although the crystallizer and the hood had no similarities, the hood still needed to be installed. When rotating the crystallizer, the hood could be turned upside down and buckled on the lens, or temporarily removed and placed in the camera bag. It was not necessary to buy the original hood. Buying a hood that matched the lens 'caliber and angle of view could play its role. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The optical parameters of the camera included the following aspects: 1. ** focal length **: This is a very important optical parameters of the lens. It refers to the distance from the main point of the lens to the focal point. It is an important performance indicator of the lens. The length of the focal length of the lens was inverse to the size of the image taken by the lens. That is, under the same object distance, the larger the focal length of the lens, the smaller the size of the image taken. Most industrial cameras use fixed-focus lenses in practical applications. Before choosing the focal length of the lens, you need to know the object distance of the on-site camera (the installation height of the camera lens from the surface of the measured object) and the field of view of the camera (the size of the characteristics of the measured object). In some applications involving the mixed inspection of objects at different heights, the use of a variable focal length lens would be considered. However, the variable focal length lens had two issues to consider: zooming speed and lens life. 2. ** Depth-of-field **: When the focal length of the lens is adjusted to a focal point, only the objects within a certain distance before and after the focal point are clearly visible. The objects outside this distance are blurred. This distance is the depth of field of the lens. 3. ** Pieces and resolution **: Pieces are the smallest unit of an image generated by the imaging chip, such as a 2-million-pel image. The resolution referred to the imaging ability of the CCD-or CMOS-chip. For example, the resolution of a 2-million-pel camera was 1626 x 1236, which meant that the camera had 1626 x 1236 rows in the X-axis direction. The total image taken was about 2 million pel. The detection accuracy could be simply evaluated by dividing the actual size of the image's X-axis by the number of X-axis dots. However, the final detection accuracy was affected by many factors, including the moving speed of the object being measured, light interference, the shape of the object, the contrast of the features, the computing power of the software, and so on. 4. ** Picture element size **: This is also an important optical parameters of the camera. 5. ** Target size of sensor **: It is the most concerned part of the camera's optical parameters. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is some common optical parameters on the lens: 1. ** effective focal length (EFL)**: The distance from the center of the lens to the focal point. It could be divided into image focal length (the distance between the main surface of the image and the focal point of the image) and object focal length (the distance between the main surface of the object and the focal point of the object). If the focal length is too short, it will cause the field of view to be too large, causing distortion, difficulty in controlling the angle of the chief ray, low contrast, serious lens bending, difficulty in correcting the phase difference, and other problems. If the focal length is too long, the lens will be too long, which is not conducive to the miniaturized system. Moreover, the field of view is too small to meet the user's needs (FoV>60°). 2. ** Total length of lens (TL)**: It is divided into optical length (the distance between the first surface of the lens and the image surface) and mechanism length (the distance between the end of the lens barrel and the image surface). 3. ** Back focal length (BTL)**: The distance from the last side of the lens in the optical system to the image plane. 4. ** Front focal length (FFL)**: The distance from the first surface of the lens to the object surface in the optical system must be distinguished from the back focal length of the mechanism. 5. ** Mechanical back focal length (FTL/FFL)**: The distance from the last mechanical surface of the lens group to the image surface. 6. ** Field of View (FoV)**: The largest field of view that the camera can capture. It can be divided into diagonal field of view (FoV-D), horizontal field of view (FoV-H), and vertical field of view (FoV-V). The diagonal field of view is the largest, followed by the horizontal field of view, and the vertical field of view is the smallest. The so-called field of view refers to the diagonal field of view of the digital camera module. The size of the field of view was related to the focal length. Generally, the larger the field of view, the shorter the focal length. 7. ** Joules (F/NO.)**: It was the ratio of the effective focal length to the diameter of the pupil, which was used to determine the brightness of the lens. Under the premise of ensuring the same aperture, the shorter the focal length, the smaller the relative aperture should be. In general, the smaller the F/#, the larger the aperture. 8. Distortion: It is the off-axis phase difference. It is the height difference between the intersection point of the off-axis point and the main ray on the image plane and the ideal (paraxial-like) image plane. It is a function of the field of view and has nothing to do with the aperture. Distortion was divided into TV distortion and optical distortion. TV distortion was further divided into pillow type and cylinder type. Distortion is the image quality that users can easily feel. Different application scenarios have different requirements for distortion. For example, Optical-Distortion <3% is not easy to detect by the human eye, and the objective lens generally requires Optical-Distortion <2%. 9. ** relative illumination (Ri)**: The ratio of the central illumination to the peripheral illumination. If the contrast was too low, the center of the image would be bright and the surroundings would be dark (vignette phenomenon, commonly known as dark corners), which would also cause color distortion. The Ri is directly proportional to COS4 (semi-fov). Different semi-fov correspond to different theoretical values of the Ri. When the Ri<50%, the human eye can distinguish it. In serious cases, the four corners of the picture will be completely black. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Seal Optical Character Recognition was a technique that converted the seal text in the image into an edited text. Through this technology, the text on the seal could be easily extracted for subsequent processing and analysis. The steps of Optical Character Recognition include image pre-processing, seal position detection and seal content recognition. In the image pre-processing stage, you can use the openLV library to perform operations such as adjusting the image size and gray-scale processing. The seal position detection needed to locate the position of the main body of the seal, and the target detection method of deep learning could be used. The content of the seal text can be identified using techniques such as curved Optical Character Recognition. The output of the seal recognition system included the coordinate frames of all the texts in the seal and the recognition results. The seal recognition technology could be applied to all kinds of seals, including round seals, oval seals, square seals, etc. It supported the recognition of multiple seals and horizontal rotations at different angles. The seal recognition system could be applied to scenarios such as official documents and bills to improve work efficiency and security.

The optical fiber interface was an interface on the main board that could connect the optical fiber directly to the computer. However, the specific use of the optical fiber interface on the main board was not clearly stated. Some of the answers mentioned that the optical fiber interface was used for audio output, such as connecting to a high-end audio amplifier. The other answers indicated that the optical fiber interface was not used to connect to the network cable, but for audio output. In general, the specific use of the optical fiber interface on the motherboards may vary depending on the model and design of the motherboards. Therefore, the search results provided did not provide a clear answer to this question.

The main optical properties of photogrammetrizers include: the objective lens has high resolution to ensure clear imaging and accurate acquisition of the information of the object being photographed; the distortion is small to make the image conform to the shape of the real object as much as possible to reduce the measurement error caused by image distortion; the light transmission is strong to ensure that enough light passes through the objective lens to reach the imaging plane, so as to obtain a better quality image for measurement. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The optical reflection sensor has the following characteristics: 1. The structure was simple and efficient. One end of the sensor was equipped with a transmitter that emitted infrared light. When a finger or object approached, it was illuminated by the light beam. The reflected signal produced a photocurrent at the other end of the detector. 2. The work was formless, with no moving parts or friction, almost no wear and tear. 3. It was easy to install and connect the wires, and it was convenient to align the light path when in use. 4. It was not affected by the shape, color, and material of the inspected object. 5. Compared to the photo-electric sensor, it saves space for installation and use. 6. It came with a light source and a light receiving device. The light emitted by the light source was reflected by the object to be tested and received by the light-sensitive element. Then, it was processed by the relevant circuit to obtain the required information. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The main technical parameters of the optical lens were as follows: 1. ** effective focal length (EFL)**: The distance from the center of the lens to the focal point. It was further divided into image focal length (the distance between the main surface of the image and the focal point of the image) and object focal length (the distance between the main surface of the object and the focal point of the object). If the focal length is too short, the field of view will be too large, resulting in distortion, difficulty in controlling the main ray angle, low contrast, serious lens bending, difficulty in correcting the phase difference, and other problems, which is not conducive to the design; if the focal length is too long, the lens will be too long, which is not conducive to the miniaturized system. If the field of view is too small, it is difficult to meet the user's needs (FoV>60°). 2. ** Total length of lens (TL)**: It is divided into optical length (the distance between the first surface of the lens and the image surface) and mechanism length (the distance between the end of the lens barrel and the image surface). 3. ** Back focal length (BTL)**: The distance from the last side of the lens in the optical system to the image plane. 4. ** Front focal length (FFL)**: The distance from the first surface of the lens to the object surface in the optical system must be distinguished from the back focal length of the mechanism. 5. ** Mechanical back focal length (FTL/FFL)**: The distance from the last mechanical surface of the lens group to the image surface. 6. ** Field of view (FoV)**: refers to the largest field of view that the lens can capture. It can be divided into diagonal field of view (FoV-D), horizontal field of view (FoV-H), and vertical field of view (FoV-V). The diagonal field of view is the largest, followed by the horizontal field of view, and the vertical field of view is the smallest. The so-called field of view usually refers to the diagonal field of view of the digital camera module. 7. ** Joules (F/NO.)**: It is the ratio of the effective focal length to the diameter of the entrance pupil, which is used to determine the brightness of the lens. Under the premise of ensuring the same aperture, the shorter the focal length, the smaller the relative aperture should be. In general, the smaller the F/#, the larger the aperture. 8. ** Distortion **: It is the off-axis phase difference. It is the aberrations of the off-axis thin beam. It is the height difference between the intersection point of the off-axis point and the main ray on the image plane and the ideal (near axis) image plane. It is a function of the field of view and has nothing to do with the aperture. The primary distortion changes with the cubic power of the field of view (image height), and the percentage distortion increases with the square of the image height. The distortion varies with different fields of view, and the distortion changes are non-linear. It is only the distortion of the image and does not affect the clarity of the image. Distortion is divided into TV distortion and optical distortion. TV distortion is further divided into pillow type and cylinder type. Different application scenarios have different requirements for distortion. For example, Optical-Distortion <3% is not easy to detect by the human eye, and Optical-Distortion <2% is the distortion requirement of the photographic objective lens. 9. ** relative illumination (Ri)**: The ratio of the central illumination to the peripheral illumination. If the contrast was too low, the center of the image would be bright and the surroundings would be dark (vignette phenomenon, commonly known as dark corners), which would also cause color distortion. The Ri is directly proportional to COS4 (semi-fov). Different semi-fov values correspond to different theoretical values of the Ri. When the Ri<50%, the human eye can distinguish it. In serious cases, the four corners of the picture will be completely black. 10. ** resolution **: It can be defined as the number of pairs of black and white stripes that can be distinguished in millimeters when the lens is used to observe the black-and-white grid pattern. When selecting a lens, the lens resolution is usually required to be slightly higher than the resolution of the picture element. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The optical axis was an innovative microswitch technology born from traditional mechanical keyboards. The principle was to replace the trigger metal paddle in the traditional mechanical shaft switch structure with an infrared optical sensor component, and use the light sensing principle to generate different equivalent resistance, forming two states of open circuit and path, and then triggering the button signal command. The optical axis mechanical keyboard had many advantages. For example, due to the one-way transmission of optical signals, the input and output ends were completely isolated. This made the keyboard and mouse peripheral products equipped with optical axis technology have strong anti-interference ability, stable operation, no contact, and long service life. In terms of specific products, for example, Skyloong's GK1048K optical axis gaming mechanical keyboard had an 8K report rate, used a "0" mechanical shake optical switch, included a scientific digital screen to display the keyboard status, and adopted the TOP-Gasket structure; The shaft body used Glacier's self-developed optical shaft body, which was close to 0ms light speed trigger, which could respond quickly in the game, and the shaft body supported hot swap for convenient replacement. The keyboard was gray, and its size was 452 × 146 × 19.5mm. The keycap was the original Mubai keycap, and the 104 keys could be used for daily work. From top to bottom, the structure is composed of a keycap, a decorative sheet, a shaft body, an upper cover, a positioning plate, a silencing sandwich, a main board, a lower shaft pad, a bottom shell silencing cotton, a bottom shell, and a bottom sticker. The main board can withstand the waterproof protection of the level of IP 68 and provides a 36-month non-human damage guarantee. It uses a multi-chip main board to reduce the delay. It is equipped with a 32-bit high-speed main control CPU +8M Flash onboard storage and 3-way 256-level RMB color management chips. The data cable interface and mode switch were located on the right side, and the data interface was a Type - C interface. There was a product nameplate at the bottom, a rubber bottom sticker, and a foot support that provided two height adjustments. There were two custom buttons in the upper right corner to adjust the brightness and volume of the keyboard. It came with an after-sales guarantee card, instruction manual, an integrated key picker, a connecting wire, a balance bar, a silica gel plug, a spare shaft, and so on. There was also the ROG Ranger 298RV optical axis keyboard, which adopted a compact F zone bar layout. The right multi-function wheel could switch functional applications such as volume, media, lighting, etc. It used the RV optical axis, which had good smoothness and stability, but the special structure could not be used for other keycaps. The key cover might be a little loose. It was a floating frame, an aluminum panel, and a magnetic wrist rest. The bottom was two-section support. The front receiver was stored and connected to the mode switch. It had a 4000mAh battery, a two-layer shell filled with silica gel, and a delayed wireless solution. The optical axis had no pins that could be directly plugged in and replaced (although it was relatively tight). The space had a five-light layout, and the light in the center of the shaft made the light concentrated and soft when the characters were in the middle of the keycap. In addition, the Skyloong 8K optical axis esports game mechanical keyboard adopted a size 104-column design, with two colors of Mubai and Daybreak. The appearance was simple and elegant, and the design was integrated with ergonomical design. The accessories included a dust cover, USB cable, an integrated key picker, a spare shaft, a balance bar, a silica gel plug, etc. The keyboard was black, white, and red. There were two metal buttons on the right side of the function button area to control the volume and lighting, and it supported custom functions. There are five anti-slip mats and a set of two-stage foot supports on the back to ensure stability and provide three height adjustments. The key cap is a sublimation PVP key cap, which is wear-resistant and durable, comfortable to the touch, and the characters are clear. It supports full-key hot swapping. If the shaft body chooses the Glacier Light Axis Fast Silver V3 shaft body (linear shaft body), the pressing weight is 48 - 52 fft, the action travel is 1.2 +/-0.2mm, and the total travel is 3.5 +/-0.3mm. It is sensitive to trigger and rapid to rebound, suitable for eSports games. The lighting effects were designed with a lower light position and supported a variety of adjustments. It could be set through shortcut keys or driver software. The GK6XPlus V8 driver, which was customized by geeks, had rich functions and supported different systems and multi-level editing. The macro management had built-in popular game macro. There were also many optical axis mechanical keyboard products on the market, such as the Double Swallow AT87, the Bloody Ghost T98, and many other mechanical keyboard products. Each of them had different prices and performance characteristics. The original novel of "The Shadow of Beacon Burning Plum Fragrance" was "The Hitman's Diary of the Pseudo Song Dynasty." The original plot was equally exciting. You can click on the link below to read the original novel.