The last article discussed in the 500W pixel camera module of the Raspberry Pie ", of course, this is normal to say relative to this infrared camera module that will be evaluated today. Before this, there were sure many netizens listened to infrared camera, including many features that attracted attention: such as night vision, "perspective", etc., what kind of performance will this infrared camera in the hand? With this curios, let's take the new "partner" of the Raspberry School.
Infrared camera module
Infrared camera and blue filter
The picture above is an infrared camera and a blue filter from RS. It is estimated that a large number of netizens will look like the author, which is simply as much as the 5 million camera module previously evaluated (see Figure), except for color.
Infrared camera module compared to ordinary camera modules
Yes, this infrared camera is exactly the same as the "normal" 5 megapixel camera module previously evaluated on the peripheral circuit, and is the same based on OV5647 5 million pixel CMOS image sensors, so the external circuit composition has no change, and the same pass 3 LDO converts the 3.3V power supply of the Raspberry Part to the voltage required by the CMOS sensor (IO: 3.0V, Core: 1.5V, Analog: 2.8V). And the main difference between them is the construction inside the camera. To explain this problem, we first understand how the camera is encapsulated (see below).
Infrared camera is a plus infrared filter when packaged
The above figure can be said to be a normal package of a normal camera, and the infrared camera and the difference are not to add an infrared cut filter (if-cut-fliter) when the camera is encapsulated, it is well known that the infrared line is not visible, the naked eye cannot capture However, the image sensor of the camera is different, and it does not reject it. If the infrared filter is not added, the image sensor will generate "distortion" due to the infrared to enter the entered the infrared to enter the "distortion". The scene seen will be slightly different, so the general cameras will add an infrared cut filter to achieve photography or video, the image is realistic and accurate.
From the infrared camera packaging process, this is less than the previously common camera, which is less expensive. The price should be cheaper, but actually quoted on RS is 205RMB, maybe a little is a little expensive. law.
Blue plastic piece? --Infragram
Understand the infrared camera, I don't know if you have a blue plastic piece next to the infrared camera module next to the first picture. It is included in the infrared camera packaging. What is the use? If you think this is just an ordinary plastic piece, it's a big mistake. I believe that the author publishes its price valuation will let a large number of netizens ignorant 'hurt' - Buy alone, quotation in the public Lab Mall 10 delicious knife. It is good enough to buy an infrared camera module, why not send you a blue filter for free.
Very curious, what is this blue filter? If you are your plant enthusiast, maybe you see the Infragram project on the country, Infragram is a camera that can observe the growth of surrounding plants, and its principle is to shoot the photosynthesis of plants in the infrared line, listen, very mystery of.
The action of this blue filter is here, which can be used as an infragram camera, or the specific method is to change the infrared cut filter in the camera to this blue filter, it The main function is to shoot the plant, replacing the infrared "red light", while other visible lights are imaged in "blue", and the image is presented in the form of NDVI (Vegetation Normalization Index) by online image analysis processing tool or Photoshop. picture.
The left portion is an Infragram real shot image, and the right part is the post-processing image.
On the right side of the above figure, the image can be observed to observe the photosynthesis of the plant after processing, the stronger the plant photosynthesis, and this method of observing the growth of plants can be used to observe the growth of plants in this way. Whether in civil or military, it is very common. Infragram's construction is not demonstrated in this evaluation because of the demolition of the camera.
Infrared searchlight
As the name suggests, the infrared searchlight is a similar searchlight consisting of infrared LEDs, which is used to assist in infrared photography at night to provide light sources for infrared photography.
Infrared searchlight
The picture above is the infrared detector TV6700 provided by RS, all steel body, 53 * 37mm, excellent sealing. Mainly by:
24 infrared LEDs
12V DC power supply, 2.2W power
Wave length 850nm, irradiation range 10m ~ 18m
The infrared detective lamp TV6700 is manufactured by the German ABUS-Safety Center company. The quality has not been said, but the price is not very expensive, and it is not easy to buy in China. You can only order it through the English website of RS, the price is up to 38.70 pounds (opinion These are all the rich and handsome, I don't know if the sparer of the Raspberry School has a feeling).
I don't pay attention to the price, some people may have questions first, how is this to be used?
As mentioned in previous, the infrared rays are not visible, while taking pictures during the day, even if the infrared rays are strong, because the image of the photo camera of the infrared camera is almost visible, it is not too big (of course, Filters installed on visible light can reach infrared photography during the day, or even the effect of perspective, and therefore, some other applications are born, this article will not be discussed). Based on this, the most applicable time of the infrared camera is usually at night, as a monitoring or night vision, etc., the popularity of the infrared monitor is still very wide, I believe that everyone has seen in the road or community, and basically Can see the infrared camera with a "red" light shop, these are infrared LEDs.
So, the main role of this infrared searchlight is to match the infrared camera to take photos or photography at night, and there is no significance of buying alone. Careful netizens may find a problem, isn't the infrared rays not not visible? Why can we see "Red Locomotive" in the monitor? To answer this question, the author has to go again.
The wavelength range of the infrared rays is between 760 nm to 1 mm. After the longest visible light red light, the shorter wavelength is in the range of infrared wavelengths, the easier, the more likely, the phenomenon of red explosion (also what we see "red "), It is about 900 nm. The shorter the wavelength, the shorter the wavelength, the stronger the camera on the infrared line, such as the sensing of the camera in the 850 nm wavelength, is 10 times the sensation of 940 nm. This provides a guarantee for the imaging effect of the night infrared camera, and therefore, this is the first choice for most night infrared monitoring. The TV6700 infrared detector on the hand of the author is also this wavelength band.
Team with infrared detective lights
After understanding the infrared camera and the infrared detector, we combine this to take pictures with your partner.
Raspberry Party with Infrared Camera and Infrared Lights
In order to compare the camera effect of the infrared camera and the previously evaluated ordinary camera, the following will take pictures to compare the test. The specific operation of the raspberry is no longer referred to, it can be referred to than the iphone4 camera - Raspberry The steps in the camera module evaluation.
Due to the daylight, the infrared camera is not changed in the daytime camera effect and the ordinary camera, and the picture is jumped, and the picture below is mainly for the photo comparison of the dark position.
Take pictures of the general 5 million camera dark position with the infrared looklight (click on the picture to enlarge)
The picture original image of the dark position of the infrared 5 million camera in the infrared light (click on the picture to enlarge)
After reading the comparison of the two photos above, I believe that everyone has a clear understanding of the infrared camera, compared with the ordinary camera, the difference is quite large. Perhaps someone will dismissive, think that the effect of the flash is stronger than this. This is not reasonable, but I think everyone must first recognize the positioning of the infrared camera, to give the easiest example, such as the monitoring of the community corridor, under the premise of ensuring the real-time monitoring, try to make silent, Do not disturb the people, at this time, then the effect of the infrared detective lamp and the flash is high.
Try the infrared camera, and then answer the article title infrared "Perspective", first, the infrared perspective does exist, but if you want to achieve a perspective, you must meet the following two points:
First, we all know that the wavelength of the infrared rays is better than the visible light, so that light diffraction is strong, it is easier to bypass the obstacle, so when the infrared rays are sufficient enough (can be understood as enough large enough), it is possible to penetrate the single Clothing, such as nylon, silk, mixed cotton fabric, etc.
Second, we must use infrared imaging must shield the visible light, and the filter of the market is quite a few;
These two conditions can be integrated, and this function of the Raspberry Part is still done by infrared. However, here, due to the restrictions of the author - there is no matching visible light filter, "the smart woman is difficult to be no rice", and the perspective function can only have the opportunity to show again.
summary
This chapter mainly introduces the character of the Raspberry Freedous Camera module and the use of the infrared searchlight, feel the special experience of the reddex, with the continuous opening, development of smart life, and the camera has become an indispensable part of smart life. Although the development tool represented by the Raspberry Party, its auxiliary accessories such as the camera, such as the camera, is still a little expensive, but does not hinder the enthusiasm of buying with the raspberry. Finally, give everyone an RS electronic component purchase network purchase link.
Reference
A point than iPhone4 camera - Raspberry Party Module Review
Raspberry Pi use tutorial
Raspberry Pi Chinese Forum
OmniVision Ov5647 CMOS Image Sensor
Raspberry Pi Infrared Camera Module Purchase Link
Original declaration: This article is originally created by the panel network, declined!
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