CN113558551A

CN113558551A - Image acquisition method and capsule endoscope using same

Info

Publication number: CN113558551A
Application number: CN202111126159.4A
Authority: CN
Inventors: 王林
Original assignee: Shenzhen Jifu Medical Technology Co ltd
Current assignee: Shenzhen Jifu Medical Technology Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-10-29

Abstract

The invention discloses an image acquisition method, which comprises the following steps: establishing a rectangular coordinate system, setting the size of array units of the rectangular photosensitive array as a b, setting the number of the array units as 2w 2h, and establishing the rectangular coordinate system by taking the center of the rectangular photosensitive array as an origin; the method comprises the steps of converting coordinates of array units in a rectangular coordinate system into coordinates of a polar coordinate system, expressing an array unit P point of a rectangular photosensitive array as (r, theta) in the polar coordinate system, arranging the array units according to the coordinates of the polar coordinate system, expressing all pixel units of the array units by the polar coordinates (r, theta), arranging the pixel units according to the size of theta values, placing the pixel units in a coordinate system with the theta values as horizontal coordinates and the r values as vertical coordinates, and performing interpolation processing on null value areas appearing after the pixel units are converted and arranged to obtain a target image. By adopting the image acquisition method, the shooting visual angle is improved, the shooting blind area is reduced, the stomach examination comfort level and the examination efficiency are improved, and the digestive tract is shot more comprehensively.

Description

Image acquisition method and capsule endoscope using same

Technical Field

The invention relates to the field of image processing, in particular to an image acquisition method and a capsule endoscope using the same.

Background

The existing capsule endoscope adopts a single-lens or double-lens mode generally, wherein the lens visual angle of the single lens faces to the front of the capsule endoscope, a shooting blind area is easy to appear at the folded part of the alimentary tract in the process of observing the alimentary tract due to the single lens, the design complexity is obviously improved by adopting a scheme of the front and the rear double lenses, and the power consumption of the capsule endoscope is larger.

Therefore, there is a need to develop an image acquisition method that solves the problem of blind areas in single-shot shooting in the prior art.

Disclosure of Invention

The invention provides an image acquisition method and a capsule endoscope using the same.

In a first aspect, the present invention provides an image acquisition method, comprising the steps of:

establishing a rectangular coordinate system, setting the size of array units of the rectangular photosensitive array as a b, setting the number of the array units as 2w 2h, and establishing the rectangular coordinate system by taking the center of the rectangular photosensitive array as an origin;

converting the coordinates of the array unit in a rectangular coordinate system into the coordinates of a polar coordinate system, wherein the point P of the array unit of the rectangular photosensitive array can be represented as (r, theta) in the polar coordinate system, wherein r is the distance from the point P to a pole O, and theta is the angle of rotation of an OP to a polar axis in the clockwise direction;

arranging the array units according to the coordinates of a polar coordinate system, expressing all pixel units of the array units by polar coordinates (R, theta), wherein R is more than or equal to R and more than or equal to 0, R is more than or equal to R- (K-1) a and more than or equal to R-K a, wherein K is a positive integer, arranging the pixel units according to the theta value and placing the pixel units in a coordinate system with the theta value as a horizontal coordinate and the R value as a vertical coordinate, and interpolating null value areas which appear after the pixel units are arranged in a conversion way to obtain a target image.

Further, the coordinates of the n row and m column array units in the rectangular coordinate system are (n x a-w x a, m x b-h x b), wherein m and n are positive integers.

Further, the coordinate of the array unit P point in the polar coordinate system is (

）。

In a second aspect, the present invention provides a capsule endoscope, comprising a lens, a light-sensing portion, a substrate, an image processing unit, a power supply portion and a radio frequency unit, wherein the capsule endoscope captures an image by using the image acquisition method according to any one of the first aspect.

Further, the capsule endoscope further comprises a reflection part, the reflection part is arranged on the surface of the substrate, and the reflection part refracts light.

Further, the reflecting portion may be a conical mirror or a circular mirror.

Further, the capsule endoscope further comprises a magnetic unit, and the magnetic unit is arranged at the upper end of the reflecting part.

By adopting the image acquisition method and the capsule endoscope thereof, the shooting visual angle is improved, the shooting blind area is reduced, the stomach examination comfort level and the examination efficiency are improved, and the digestive tract is shot more comprehensively.

Drawings

FIG. 1: the invention discloses an optical path schematic diagram of an image acquisition method.

FIG. 2: the capsule endoscope of the first embodiment of the invention has a schematic structure.

FIG. 3: the capsule endoscope of the second embodiment of the invention has a schematic structure.

FIG. 4: the image acquisition method of the invention is used for shooting the annular image.

FIG. 5: fig. 4 is a tiled expanded view of a ring image.

FIG. 6: FIG. 4 is a projected view of the annular image after reflection.

FIG. 7: the invention discloses a sampling schematic diagram of image pixel points.

FIG. 8: the invention discloses a polar coordinate conversion schematic diagram of an image sampling point.

FIG. 9: the invention discloses an interpolation schematic diagram of image pixel points.

Each serial number and corresponding name are respectively: a reflection part 101, a lens 102, a light sensing part 103, a substrate 104, an image processing unit 105, a power supply part 106, a radio frequency unit 107 and a magnetic unit 108.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a schematic diagram of an optical path of an image capturing method according to the present invention is shown, in which a capsule endoscope converts an angle of view of the capsule endoscope to a side annular region of the capsule endoscope by a reflection unit 101, the image capturing angle of a lens 102 is converted to the side annular region by adding the reflection unit 101 to the front of the lens, the image is projected to a light sensing unit 103 to form an annular distorted image, and the image of the light sensing unit 103 is further corrected to a rectangular undistorted image by an image processing algorithm, and the light sensing unit 103 is disposed on a surface of a substrate 104.

Referring further to fig. 2 and 3, the capsule endoscope of the first embodiment of the present invention and the capsule endoscope of the second embodiment of the present invention both include a reflection portion 101, a lens 102, a light sensing portion 103, a substrate 104, an image processing unit 105, a power supply portion 106 and a radio frequency unit 107, wherein fig. 3 is different from fig. 2 in that a magnetic unit 108 is further disposed on a top portion of the lens 102 of the second embodiment of fig. 3, the magnetic unit 108 is used for an external magnetic control device to control an advancing direction of the capsule endoscope, and a connection relationship between the above components belongs to common knowledge of persons skilled in the art, and is not repeated herein.

Referring to fig. 4, fig. 5 is a tiled expanded view of the ring image of fig. 4, fig. 6 is a projection view of the ring image of fig. 4 after reflection, the ring image is reflected by the reflection portion 101 and further projected onto the light sensing portion 103 through the lens 102, and the image projected onto the light sensing chip after reflection by the reflection portion 101 is distorted compared with the ring image of fig. 4, so that the image acquired by the light sensing portion 103 needs to be corrected.

The image acquisition method of the invention has the following principle: referring to fig. 7, in the schematic image pixel sampling diagram of the present invention, a rectangular coordinate system is first established on the photosensitive array, the size of the array units of the rectangular photosensitive array is set to be a × b, the number of the array units is 2w × 2h, and the rectangular coordinate system is established with the center of the photosensitive array as the origin, so that the coordinates of the m rows of photosensitive array units in the nth row can be expressed as (n × a-w × a, m × b-h b), where m and n are positive integers.

Referring to fig. 8, a schematic diagram of polar coordinate transformation of image sampling points according to the present invention, the coordinates of the array unit in the rectangular coordinate system are transformed into the coordinates of the polar coordinate system, the point P of the array unit on the photosensitive array in the polar coordinate system can be represented as (r, θ), where r is the distance from the point P to the pole O, θ is the angle from the OP to the polar axis in the clockwise direction, and the coordinates of the photosensitive array unit in the nth row and the m columns of the rectangular coordinate system in the polar coordinate system can be represented as (b)

）。

Referring to fig. 9, the image pixel interpolation diagram of the present invention further rearranges the array units according to the polar coordinate system, and expresses all the pixel units sensed by the photosensitive array unit by polar coordinates (R, θ), where R is greater than or equal to 0 and less than or equal to R, R is greater than or equal to R- (K-1) a and less than or equal to R-K a, where K is a positive integer, and arranges the pixel units according to the magnitude of θ, and then places the pixel units in a coordinate system with θ as the abscissa and R as the ordinate, and after the pixel units are arranged in a conversion manner according to the above method, null areas appear, and the complete image is obtained after the null areas are interpolated.

The null value filling principle of the present solution is to fill the valid pixel closest to the null value region, and if there are a plurality of pixels with the same distance in the null value region, then fill the average value of nearby color information, and a specific algorithm for image interpolation has been described in detail in a plurality of prior art documents, for example, chinese patents CN201911121851.0, CN202010214137.2, and CN201910188662.9, which is not limited by the present invention.

Preferably, the reflecting portion 101 of the present invention may be any one of a conical mirror and a circular mirror, but the present invention is not limited thereto.

The invention also provides a capsule endoscope which adopts the image acquisition method to shoot images.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An image acquisition method, characterized by comprising the steps of:

2. The image acquisition method of claim 1, wherein the coordinates of the n row and m column array elements of the rectangular photosensitive array in the rectangular coordinate system are (na-wa, mb-hb), where m and n are positive integers.

3. The image capturing method of claim 1, wherein the coordinates of the array unit P point of the rectangular photosensitive array in the polar coordinate system are (

）。

4. A capsule endoscope comprising a lens, a light-sensing section, a substrate, an image processing unit, a power supply section and a radio frequency unit, wherein the capsule endoscope captures an image by the image capturing method according to any one of claims 1 to 3.

5. The capsule endoscope of claim 4, further comprising a reflective portion disposed on a surface of the substrate, the reflective portion refracting light.

6. The capsule endoscope of claim 5, wherein the reflecting portion is any one of a cone-shaped reflecting mirror and a circular reflecting mirror.

7. The capsule endoscope of claim 5, further comprising a magnetic unit disposed at an upper end of the reflection portion.