When buying a hunting camera, many users are easy to enter a misunderstanding - "the higher the pixel, the better." It seems like this, but it is not the case. To understand this problem, we have to know the two concepts and the relationship between them: physical pixels and interpolated pixels. Physical pixel: The largest pixel that the original image sensor can reach. Interpolated pixels: Interpolation is the process by which the DSP copies the pixels through the program to enhance the resolution.
Advantages and Disadvantages of Interpolated Pixels: The advantage of interpolated pixels is the improvement in the intuitive parameter placement. For example, the processing of the DSP can interpolate 30W physical pixels to 1200W pixels. However, the actual image effect has not improved. Instead, it will increase the burden on the DPS CPU. It is completely incompatible with physical pixels in sharpness of sharpness. In terms of picture quality, the decisive factor is the physical pixel, specifically the physical pixel that the camera camera (CCD or CMOS) can actually capture.
At present, the camera of the hunting camera brand that everyone can see does not have a CMOS sensor exceeding 5 million pixels. Many of the so-called so-called 8 million, 12 million pixels, most of which are digital interpolation, it should be seen that the SENSOR resolution in the parameters is the real physical pixel that can be achieved.
Regarding the pixel problem of hunting camera, there is the following consensus, you need to understand:
1. Interpolating high pixels does not improve the photo quality;
2. The image file size increases, the camera write time becomes longer, and the power consumption increases, which makes the standby time of the infrared camera shorter;
3, the image file volume increases, it will occupy more memory card space, wasting storage card storage space;
Therefore, when shooting and when purchasing an infrared sensor to trigger the camera, from the perspective of the picture quality effect, it is necessary to select the appropriate shooting pixels, not the larger the pixel, the better. Too high a pixel has almost become a means of business promotion.
2. Is the maximum pixel of the image sensor good?
The answer is naturally no. It seems to be the same, but only the image sensor is good, and it does not mean that the imaging effect is good. We continue to talk about the facts. The physical pixel is high, which can only be said to be the pixel height that the camera can shoot. The imaging effect is better, and there is a hardware that plays a key role in image processing.
Whether it is a SLR camera, a satellite remote sensing camera, a motion camera, a driving recorder, or a wild-infrared sensor-inducing camera for wildlife, the image processor solution cannot escape such a few programs: Ambarella, Sunplus (SUNPLUS), United States (NOVATEK), Jelin (Jerlin).
Which program is good? How do you see what scheme is used by your infrared sensor to trigger the camera? There is a verification method: disassemble to see the main control chip (a good choice for technical control), you can also see the maximum format of the video. The rest is Baidu. There are still a lot of articles on the Internet. Many articles are written more objectively. I can read a few more articles. The sorting in my heart is probably still coming out... There is a good solution, just like a Building a tall building, the foundation is better than others.
3. Is the image processing solution good?
The answer is naturally also negative. The picture taken by a camera is better, not only depends on having a good camera, a good image processing solution. There are still a lot of details about the various aspects that can't be told.
3.1 camera shutter speed
The shutter speed of the camera can't keep up. To achieve the same color effect, you need to lengthen the exposure time. But we mainly use it to shoot wild animals in motion. It doesn't take a pose for us every time. We took a slow shot, which caused the shutter to keep up with the camera and the photos had a trailing phantom.
3.2 Optical processing of the entire optical path
A lot of high-quality SLR cameras and telescopes have this kind of processing. The images taken have a layered depth of field and the colors are closer to reality. A good camera must have a good light path, such as: image sensor, lens, infrared cut-off film, filter, refraction, reflection, extinction shadow, mirror area water, etc. High quality image effects.
3.3 night fill light fill light solution
At present, most of the photos taken at night are white in the middle, almost showing a white explosion. There are two reasons for this: First, the infrared light fill effect is not even enough, the light is too concentrated in the center; second, the camera solution is a hard injury, the current technology can achieve close exposure to prevent exposure, this depends on the camera The technical strength of the solution provider.
4. A good layout can also improve the shooting effect.
Click to view the precautions when setting up the infrared sensor camera (installation)
All of the above are the characteristics of an infrared camera as a "camera". Whether a camera can take good picture quality depends on multiple hardware modules. This is a system engineering. Need a very strong R & D team.
In the following, as a professional tool, what are the higher requirements for users of different application scenarios in different application areas?
5. False shot rate, missed shot rate
Any infrared sensor trigger camera is out of the factory. There is a setting in the machine that can affect the "mistake rate, miss rate", which is the sensitivity setting of PIR sensor. Generally, there are "high/medium/low" files. The camera's gear position can be set depending on the main subject. A really good product, this is definitely not enough.
Each manufacturer team has different designs for PIR sensing. Circuits, algorithms, component selection, etc. determine the advanced nature of this PIR sensing, and the initial design reduces the false beat rate and the missed shot rate to a smaller extent.
It is emphasized that if you want the error rate to be 0, it is obviously impossible to do it, because the working principle of PIR is determined. Ambient temperature, hot air, wind direction, light, and vibration can cause false shots.
6. Camera sense capture speed, sensing range and shooting range
6.1 camera sensing capture speed
It refers to the length of time it takes for the camera to move from sensing to capturing the photo. The lower the indicator, the better it will be to capture the faster moving animals, but not as low as possible; if it is too fast and the PIR angle fit problem, it is easy to shoot only half of the animals; so between 0.5 and 1 second Most appropriate. At present, all manufacturers are similar, most of them are between 0.8 and 1.2 seconds. Individuals can also achieve 0.5 or 0.3 seconds with a simple solution, but the quality of this camera is not too good.
6.2 sensing range
Sensing range, once again affirmation is definitely not as wide as possible, this parameter should be measured together with the shooting. The principle is that the sensing range cannot be larger than the shooting range; otherwise, you will find a lot of empty photos.
6.3 shooting range
The shooting range is selected according to the actual application environment. In the case of a large number of animals, it is recommended to use a small sensing angle and a large shooting range (of course, the larger the angle, the unit image details are worse, and the large angle night vision is a difficult thing to deal with, so it is still based on its own Need to choose!)
7. Three anti-performance
As a shooting tool that has been placed in the field for a long time, the user's most important performance for the three-proof performance is undoubtedly waterproof. At present, two of them are still doing well, and they are nominally IP68. In the bidding comparison test and laboratory, they can basically pass the water test for a period of time.
Note:
"Immerse in water for a certain period of time or water pressure below a certain standard to ensure that it will not be damaged by water immersion." This is the technical standard of IPX7. The technical standard of real IPX8 is "indefinitely sunk at the specified water pressure. Make sure that it is not damaged by water infiltration," but the test is impossible to "indefinitely sink." Therefore, we are not strict with the bidding and laboratory testing is not rigorous. In the long-term field measurement, the user naturally has more say.
8. Low power consumption
When purchasing an infrared sensor-triggered camera, most of them ask such a question: How long can I take? In fact, this is a power problem. If the respondent answers this question in one or two sentences, it is naturally not rigorous. It needs to be divided into three states: standby state, daytime shooting state, night shooting state; of course, it is related to the surrounding environment of these three states, the most important is the ambient temperature, we simplify things, and the factors of shooting temperature are left out first. .
Standby state: refers to the amount of power consumed by the camera in the standby state when it is not photographed. In this state, only the PIR sensor module is in operation, the camera is in the minimum working state; most of the standby current is around 400~800uA. The choice is of course as small as possible.
Daytime shooting status: refers to the amount of power consumed by the camera to capture images without turning on the night vision fill light. At present, the power consumption of most manufacturers' cameras is not too high, about 200mA~350mA, in an acceptable range.
Night shooting status: refers to the amount of power consumed by the camera to capture images while the night vision fill light is turned on. In this state, the camera is in the maximum power state. This indicator varies greatly from manufacturer to manufacturer.
At present, most manufacturers consume very large power, and some can be as high as 1.8A, scared! I don't know what the designer thinks. Such a large discharge current does not take into account the feeling of people's batteries. It completely means that the battery is hung up. Think about it, you can understand that the current is so large, mainly to get a better night vision effect. But did not consider the problem of transitional power consumption, after all, this is battery powered. In the outskirts of the country, there is no external power supply, no generator, it depends on the battery!
In terms of how to reduce power consumption, there are influences on the selection of components and the design of circuits. There are many ways to improve night vision, which reflects the rigor of the manufacturer's design, technical strength and the pursuit of quality. It is not necessary to increase the brightness of the lighting; several relatively good manufacturers have a current of about 0.8~1.2A, and the night vision effect is also very good, which is quite reasonable.
Of course, this is also related to the sensitivity of PIR sensing. The more sensitive the sensor is, the more power is taken. The power consumption is naturally large, and the effective working time in the field is naturally short. In addition, the camera mode is definitely much more powerful than the camera mode.
At present, the infrared sensor-triggered camera power consumption on the market can basically meet the needs of users: when conditions permit, the average user tends to take up data once in 1-2 months, and the infrared sensor triggers the camera shooting environment. Maintenance. There are very few intervals for more than half a year for data extraction and shooting environment maintenance.
9. Other qualities that should be possessed
9.1 anti-theft
This is a question of benevolent seeing the wise and seeing wisdom. Infrared sensing triggers the camera's body color, adds a memory card anti-theft lock, adds a body anti-theft lock, and adds an iron body shell, all of which fall into this category.
9.2 Reasonable design
Consider the convenience of operation, fatigue durability of equipment (buttons, cables, battery compartment covers, etc.).
9.3 Easy to operate software
A user-friendly software operation interface will also win the favor of users.
We need to select the most suitable infrared sensor trigger camera according to different monitoring needs, and give full play to the huge advantage of hunting camera in field monitoring work. At the same time, making a good hunting camera requires each manufacturer to carefully craft their products with the ultimate attitude, and strive for perfection. Put your energy on the product in a down-to-earth manner. I hope to see more excellent hunting cameras in the future.
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