CN105049690A - Portable polarization digital camera and imaging method - Google Patents

Abstract

The invention discloses a portable polarization digital camera and its imaging method. The portable polarization digital camera includes: three polarizers and an image sensor; The angles are respectively pasted in parallel in the first area, the second area and the third area of the channel of the preset wavelength on one side of the image sensor, the channel of the preset wavelength is divided into four areas, and the polarizer is used to correct the incident light Shielding and transmission are performed to obtain optical signals of different polarization angles; the image sensor is used to receive the optical signals of different polarization angles obtained by the three polarizers, and convert the optical signals of different polarization angles into electrical signals. By pasting multiple polarizers in a specific wavelength channel, it can effectively reduce or eliminate the reflection of non-metallic surfaces, improve color saturation, improve contrast, obtain wider field of view images, and achieve finer imaging.

Description

Portable Polarization Digital Camera and Its Imaging Method

technical field

The invention relates to the technical field of polarization digital cameras, in particular to a portable polarization digital camera and an imaging method thereof.

Background technique

In the early 1980s, aerial digital cameras made of CCD devices appeared, and various digital cameras emerged in the following years. With the development of CCD devices, digital cameras have changed from line array and area array airborne digital cameras to video format aerial digital cameras to line array and area array aerial digital camera systems. Typical aerial digital cameras include ADS40, DMC, UltraCamD, etc.

The composition of aviation polarization digital camera mainly includes optical lens, polarizer, filter and CCD area array detector. The optical system is mainly composed of a large-diameter negative lens front group and a double-glued positive lens rear group. The main function of the front group is to reduce the angle between the beam and the optical axis, eliminate the astigmatism and distortion of the system as much as possible, and prepare for the focused imaging of the rear group; the rear group arranges and focuses the beam, mainly eliminating chromatic aberration; The rear group cooperates to elongate the rear intercept and form an optical system that is telecentric in the image space.

In view of this, how to effectively reduce or eliminate the reflection of non-metallic surfaces, improve color saturation, improve contrast, obtain images with wider field of view, and achieve finer imaging has become a technical problem that needs to be solved at present.

Contents of the invention

Aiming at the defects in the prior art, the present invention provides a portable polarized digital camera and its imaging method, which can effectively reduce or eliminate reflections on non-metallic surfaces, improve color saturation, improve contrast, obtain images with wider field of view, and realize more Detailed imaging.

In the first aspect, the present invention proposes a portable polarization digital camera, comprising: three polarizers and an image sensor;

The three polarizers are pasted parallel to the first region, the second region and the second region of the channel of the preset wavelength on one side of the image sensor at a first preset angle, a second preset angle and a third preset angle respectively. In the three areas, the channel of the preset wavelength is divided into four areas, and the polarizer is used to shield and transmit the incident light to obtain optical signals with different polarization angles;

The image sensor is configured to receive the optical signals of different polarization angles obtained by the three polarizers, and convert the optical signals of different polarization angles into electrical signals.

Optionally, the first preset angle is 0°, the second preset angle is 60°, and the third preset angle is 120°.

Optionally, the polarizer is a composite material formed by laminating a polarizing film, an inner protective film, a pressure-sensitive adhesive layer and an outer protective film.

Optionally, the image sensor is an image sensor composed of a pixel array, each pixel in the pixel array is a photodiode, and the number of pixels in the pixel array is on the order of 10 ⁵ to 10 ⁷ .

Optionally, the portable polarization digital camera also includes: an analog-to-digital converter, an imaging lens and a body;

The analog-to-digital converter is located in the body and is used to receive the electrical signal converted by the image sensor and convert the electrical signal from an analog signal to a digital signal;

The imaging lens is located in the body and is used for receiving the digital signal converted by the analog-to-digital converter and forming an image according to the digital signal.

Optionally, the image sensor is an area array CCD sensor.

In a second aspect, the present invention proposes an imaging method based on a portable polarization digital camera, including:

Three polarizers in the first region, the second region and the third region of the channel of the preset wavelength on the side of the image sensor are respectively pasted in parallel at the first preset angle, the second preset angle and the third preset angle Shield and transmit the incident light to obtain optical signals with different polarization angles;

The image sensor receives the optical signals of different polarization angles obtained by the three polarizers, and converts the optical signals of different polarization angles into electrical signals.

Optionally, the channel of the preset wavelength is divided into four regions, the first preset angle is 0°, the second preset angle is 60°, and the third preset angle is 120°.

Optionally, the method also includes:

An analog-to-digital converter receives the electrical signal converted by the image sensor, and converts the electrical signal from an analog signal to a digital signal;

The imaging lens receives the digital signal obtained by the analog-to-digital converter, and forms an image according to the digital signal.

It can be seen from the above technical solution that the present invention can effectively weaken or eliminate the reflection of non-metallic surfaces by pasting multiple polarizers in channels of specific wavelengths, improve color saturation, improve contrast, obtain images with wider fields of view, and achieve finer of imaging.

Description of drawings

Fig. 1 is a schematic structural diagram of a portable polarization digital camera provided by an embodiment of the present invention;

Fig. 2 is the structural representation of each channel of the image sensor of the portable polarization digital camera shown in Fig. 1;

FIG. 3 is a schematic flowchart of an imaging method based on a portable polarization digital camera provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 shows a schematic structural view of a portable polarization digital camera provided by an embodiment of the present invention, including: three polarizers 11 and an image sensor 12;

The three polarizers 11 are respectively pasted parallel to the first area and the second area of the channel of the preset wavelength on one side of the image sensor 12 at the first preset angle, the second preset angle and the third preset angle and in the third area, the channel of the preset wavelength is divided into four areas, and the polarizer 11 is used to shield and transmit the incident light to obtain optical signals with different polarization angles;

The image sensor 12 is configured to receive the optical signals of different polarization angles obtained by the three polarizers 11 and convert the optical signals of different polarization angles into electrical signals.

In a specific application, the first preset angle in this embodiment is 0°, the second preset angle is 60°, and the third preset angle is 120°.

In a specific application, the image sensor 12 in this embodiment is an image sensor composed of a pixel array, each pixel in the pixel array is a photodiode, and the number of pixels in the pixel array is on the order of 10 ⁵ to 10 ⁷ . That is, the image sensor 12 includes photodiodes on the order of 10 ⁵ to 10 ⁷ .

It should be noted that the image sensor 12 is the core component of the camera of the present invention, which converts the diffuse reflection light signal collected from the sample into an electrical signal, and its quality determines the imaging quality of the digital camera. Although its volume is very small, it contains Hundreds of thousands or even tens of millions of diodes with photosensitive characteristics - photodiodes. Each photodiode is a pixel, and the image sensor is a pixel array composed of the pixels. When light is irradiated, the photodiode will generate charge accumulation, and the accumulated charge will eventually be converted into corresponding pixel data.

Fig. 2 shows the structure diagram of each channel of the image sensor 12, as shown in Fig. 2, each pixel corresponds to a channel 121, and the channel is used to store the selected content and other information in an image file, usually representing the color in the image The change of level, such as the channel in the grayscale image shows the change of 256 color levels from black to white. In this embodiment, each channel 121 is divided into four areas, namely a first area 1211 , a second area 1212 , a third area 1213 and a fourth area 1214 .

In a specific application, the image sensor 12 in this embodiment may preferably be an area array charge coupled device (Charge Coupled Device, CCD for short) sensor.

In a specific application, the polarizer 11 in this embodiment is a composite material formed by laminating a polarizing film, an inner protective film, a pressure-sensitive adhesive layer and an outer protective film. The polarizer 11 described in this embodiment is integrated on each channel 121 of the preset wavelength, and each channel of the preset wavelength is divided into four areas, the first area 1211, the second area 1212 and the third area 1213 respectively Three polarizers with different angles (0°, 60° and 120°) are pasted, and the fourth region 1214 is not pasted with a polarizer, so as to achieve finer imaging and obtain rich image information of the imaging object. The polarizing plate 11 has the function of shielding and transmitting the incident light, which can make longitudinal light or transverse light pass through and shield.

In a specific application, the portable polarization digital camera described in this embodiment also includes: an analog-to-digital converter (A/D converter), an imaging lens, and a body;

The analog-to-digital converter is located in the body and is used to receive the electrical signal converted by the image sensor and convert the electrical signal from an analog signal to a digital signal;

The imaging lens is located in the body and is used for receiving the digital signal converted by the analog-to-digital converter and forming an image according to the digital signal.

The analog-to-digital converter, imaging lens, and camera body described in this embodiment are similar to common cameras, and will not be repeated here.

In the prior art, each area of each channel of an ordinary camera uses the same imaging mode, but the present invention realizes snapshot imaging at four different angles by integrating polarizers on each channel.

The portable polarized digital camera provided in this embodiment can effectively weaken or eliminate the reflection of non-metallic surfaces by pasting polarizers with different angles in front of the imaging lens, and can also effectively improve color saturation and contrast, and has three polarizers with different angles Simultaneous imaging can obtain images with a wider field of view and achieve finer imaging.

FIG. 3 shows a schematic flowchart of an imaging method based on a portable polarization digital camera provided by an embodiment of the present invention. As shown in FIG. 3 , the imaging method based on a portable polarization digital camera in this embodiment is described as follows.

301. Paste the three in the first area, the second area, and the third area of the channel of the preset wavelength on the image sensor side in parallel at the first preset angle, the second preset angle, and the third preset angle, respectively. The polarizer shields and transmits the incident light to obtain optical signals with different polarization angles.

302. The image sensor receives optical signals of different polarization angles obtained by the three polarizers, and converts the optical signals of different polarization angles into electrical signals.

In a specific application, the channel of the preset wavelength in this embodiment is divided into four areas, the first preset angle is 0°, the second preset angle is 60°, and the third preset angle is 120°.

In a specific application, the method described in this embodiment further includes steps 303 and 304 not shown in the figure:

303. The analog-to-digital converter receives the electrical signal converted by the image sensor, and converts the electrical signal from an analog signal to a digital signal.

304. The imaging lens receives the digital signal obtained by the analog-to-digital converter, and forms an image according to the digital signal.

The imaging method based on the portable polarization digital camera of this embodiment, based on the portable polarization digital camera of the embodiment shown in Figure 1, can effectively weaken or eliminate the reflection of the non-metallic surface, improve the color saturation, improve the contrast, and obtain a wider field of view image to achieve finer imaging.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope defined by the claims of the present invention .

Claims (9)

1. A portable digital camera for polarization, comprising: three polarizers and an image sensor; The three polarizers are pasted parallel to the first region, the second region and the second region of the channel of the preset wavelength on one side of the image sensor at the first preset angle, the second preset angle and the third preset angle respectively. In the three areas, the channel of the preset wavelength is divided into four areas, and the polarizer is used to shield and transmit the incident light to obtain optical signals with different polarization angles; The image sensor is configured to receive the optical signals of different polarization angles obtained by the three polarizers, and convert the optical signals of different polarization angles into electrical signals. 2. The portable polarization digital camera according to claim 1, wherein the first preset angle is 0°, the second preset angle is 60°, and the third preset angle is 120° . 3. The portable polarized digital camera according to claim 1, wherein the polarizer is a composite material formed by laminating a polarizing film, an inner protective film, a pressure-sensitive adhesive layer and an outer protective film. 4. The portable polarization digital camera according to claim 1, wherein the image sensor is an image sensor composed of a pixel array, each pixel in the pixel array is a photodiode, and the pixel in the pixel array The number is on the order of 10 ⁵ to 10 ⁷ . 5. The portable polarized digital camera according to claim 1, further comprising: an analog-to-digital converter, an imaging lens and a fuselage; The analog-to-digital converter is located in the body and is used to receive the electrical signal converted by the image sensor and convert the electrical signal from an analog signal to a digital signal; The imaging lens is located in the body and is used for receiving the digital signal converted by the analog-to-digital converter and forming an image according to the digital signal. 6. The portable polarization digital camera according to claim 1, wherein the image sensor is an area array CCD sensor. 7. An imaging method based on a portable polarization digital camera, comprising: Three polarizers in the first region, the second region and the third region of the channel of the preset wavelength on the side of the image sensor are respectively pasted in parallel at the first preset angle, the second preset angle and the third preset angle Shield and transmit the incident light to obtain optical signals with different polarization angles; The image sensor receives the optical signals of different polarization angles obtained by the three polarizers, and converts the optical signals of different polarization angles into electrical signals. 8. The method according to claim 7, wherein the channel of the preset wavelength is divided into four areas, the first preset angle is 0°, the second preset angle is 60°, The third preset angle is 120°. 9. The method according to claim 7, further comprising: An analog-to-digital converter receives the electrical signal converted by the image sensor, and converts the electrical signal from an analog signal to a digital signal; The imaging lens receives the digital signal obtained by the analog-to-digital converter, and forms an image according to the digital signal.