CN110636198A - Imaging method and device and endoscope equipment - Google Patents
Imaging method and device and endoscope equipment Download PDFInfo
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- CN110636198A CN110636198A CN201910979350.XA CN201910979350A CN110636198A CN 110636198 A CN110636198 A CN 110636198A CN 201910979350 A CN201910979350 A CN 201910979350A CN 110636198 A CN110636198 A CN 110636198A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
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Abstract
The invention discloses an imaging method and device, which can simultaneously image a first area and a second area of a photosensitive surface at different exposure times, wherein the first area of the photosensitive surface of an imaging part receives a part of incident light guided by a first light-emitting part of a lens part, and the second area of the photosensitive surface of the imaging part receives a part of incident light guided by a second light-emitting part of the lens part; and synthesizing the first area and the second area of the formed image according to a preset rule, and outputting the synthesized image. The imaging method and the device divide the light-sensing surface of the imaging part into a first area and a second area, respectively guide object light to enter the first area and the second area of the light-sensing surface, respectively and simultaneously image the first area and the second area of the light-sensing surface at different exposure time, and synthesize images of the first area and the second area to obtain images with proper brightness levels in different areas of the images. The invention also discloses an endoscopic device.
Description
Technical Field
The present invention relates to the field of optical imaging technology, and in particular, to an imaging method and apparatus. The invention also relates to an endoscopic apparatus.
Background
When an endoscope is used for observing an in-vivo cavity, the difference between the distances between tissues at different positions in a visual field range and a detection end is often large, so that the illumination brightness of the tissues at different positions is extremely uneven, and therefore if the acquired images are not processed, the acquired images are easy to appear in the same image, and over-exposure and over-darkness exist simultaneously, and the requirements cannot be met.
In the prior art, a High-Dynamic Range (HDR) technology is used to improve the above situation, and specifically, the method includes: images generated by the same imaging system and the same shooting position but with different average brightness levels are synthesized into one image. The high-brightness area of the image is mainly based on the content of the low-brightness level image, and the low-brightness area is mainly based on the content of the high-brightness level image, so that different areas of the image can have proper brightness levels. Therefore, the brightness response range of the imaging system can be expanded, and the situation that overexposure and over-darkness occur simultaneously in the image is eliminated.
The average brightness level of the image is determined by the lens aperture, the image sensor sensitivity and the exposure time. In endoscopic imaging systems, the lens aperture is typically a fixed value, so the average brightness level can only be adjusted by changing the image sensor sensitivity and the exposure time (shutter speed). Since changing the sensitivity of the image sensor causes a change in image noise, in order to ensure image quality, the endoscopic imaging system generally synthesizes images with different exposure times. The specific embodiments include the following two types:
the first method comprises the following steps: the frame rate of a certain model of CMOS is 60Hz, namely, 60 images are acquired per second, and the acquisition period of a single image is about 16.67 ms. The exposure time of actual image acquisition can be set to be 16ms and 8ms alternately, the image acquired by the exposure time of 16ms is a high-brightness level image, and the image acquired by the exposure time of 8ms is a low-brightness level image. Two adjacent collected images are combined into one image, and finally the HDR image of 30Hz is realized. Three or more exposure times can be used to alternately perform image acquisition, and if the exposure time class is n, the frame rate of the final HDR image is 60/n.
The second method comprises the following steps: the frame rate of a certain model of CMOS is 60Hz, and the resolution is 1920x1080p, namely, 1920 columns of pixels and 1080 rows of pixels are included. All pixel points are divided into two groups which are alternately arranged according to rows or columns, as shown in fig. 1(a) and fig. 1(b), the pixel points are alternately grouped according to the columns in fig. 1(a), a single group comprises 960 × 1080 pixel points, the pixel points are alternately grouped according to the rows in fig. 1(b), and the single group comprises 1920 × 540 pixel points. And the two groups of pixel points respectively adopt different exposure time to generate images with different brightness levels and then are synthesized. Finally, a 60Hz HDR image with half resolution is realized. The HDR image can also be divided into n groups of pixels which are alternately arranged according to rows or columns or according to rows and columns, and the number of the pixels of the final HDR image is 1/n of that of the original image.
As can be seen from the above, the existing method for obtaining images obtains a higher dynamic response range at the cost of image frame rate or image resolution loss.
Disclosure of Invention
In view of the foregoing, it is an object of the present invention to provide an imaging method and apparatus capable of obtaining an image having appropriate luminance levels in different regions of the image and maintaining an image frame rate and resolution. The invention also provides an endoscopic apparatus.
In order to achieve the purpose, the invention provides the following technical scheme:
an imaging method, comprising:
the first area of the photosensitive surface of the imaging part receives a part of incident light guided by the first light-emitting part of the lens part, and the second area of the photosensitive surface of the imaging part receives a part of incident light guided by the second light-emitting part of the lens part;
and synthesizing the first area and the second area of the formed image according to a preset rule, and outputting the synthesized image.
Preferably, the first region of the photosensitive surface is a left region of the photosensitive surface, and the second region of the photosensitive surface is a right region of the photosensitive surface.
The lens part comprises a light splitting part, a first light emitting part and a second light emitting part, the light splitting part is used for dividing entering object light into one path of light entering the first light emitting part and the other path of light entering the second light emitting part, the first light emitting part is used for guiding light to enter a first area of a photosensitive surface of the imaging part, the second light emitting part is used for guiding light to enter a second area of the photosensitive surface of the imaging part, the imaging part is used for simultaneously imaging the first area and the second area of the photosensitive surface at different exposure times, and the image processing part is used for synthesizing the first area and the second area of the formed image according to a preset rule and outputting the synthesized image.
Preferably, the light splitting part is a prism, and the cross section of the light splitting part is a polygon formed by symmetrically combining two parallelograms.
Preferably, the length of the spectroscopic part is equal to or greater than the diameter of the light beam incident on the spectroscopic part.
Preferably, the lens part further includes a light inlet part disposed on a light incident side of the light splitting part and used for collecting the object light.
An endoscopic apparatus comprising the imaging device described above.
According to the foregoing technical solution, in the imaging method provided by the present invention, the first area of the photosensitive surface of the imaging portion receives a part of incident light guided by the first light-emitting portion of the lens portion, the second area of the photosensitive surface of the imaging portion receives a part of incident light guided by the second light-emitting portion of the lens portion, the first area of the photosensitive surface and the second area of the photosensitive surface are simultaneously imaged at different exposure times, and the first area and the second area of the formed image are further synthesized according to a preset rule to output a synthesized image. The imaging method divides the light-sensitive surface of the imaging part into a first area and a second area, leads object light to enter the first area and the second area of the light-sensitive surface respectively, images the first area and the second area of the light-sensitive surface simultaneously at different exposure time respectively, images the first area and the second area of the formed image at different exposure time respectively, and combines the images of the first area and the second area to obtain the image with proper brightness level in different areas of the image, and the method can not lose image frame rate and resolution.
The imaging device provided by the invention can achieve the beneficial effects.
The endoscope apparatus provided by the present invention can achieve the above advantageous effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1(a) is a schematic diagram of a prior art method for alternately grouping pixels of a photosensitive surface in columns;
FIG. 1(b) is a schematic diagram of a prior art method for alternately grouping pixels on a photosensitive surface in rows;
FIG. 2 is a flow chart of an imaging method provided by an embodiment of the invention;
FIG. 3(a) is a schematic view of the photosensitive surface of the imaging device and the imaging area of the lens of a conventional endoscope apparatus;
FIG. 3(b) is a schematic diagram of the photosensitive surface of the imaging portion and the imaging area of the lens portion according to the embodiment of the invention;
FIG. 4 is a schematic view of an imaging device according to an embodiment of the present invention;
fig. 5 is a schematic view of an imaging device according to another embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a flowchart of an imaging method according to an embodiment of the present invention, and it can be seen that the imaging method includes the following steps:
s10: the first area of the photosensitive surface and the second area of the photosensitive surface are imaged simultaneously with different exposure time respectively, the first area of the photosensitive surface of the imaging part receives a part of incident light guided by the first light-emitting part of the lens part, and the second area of the photosensitive surface of the imaging part receives a part of incident light guided by the second light-emitting part of the lens part.
In the imaging method of this embodiment, the imaging system includes a first light-emitting portion and a second light-emitting portion, the first light-emitting portion guides a part of the object light entering the lens portion to be incident on a first area of the photosensitive surface of the imaging portion, the second light-emitting portion guides another part of the object light entering the lens portion to be incident on a second area of the photosensitive surface of the imaging portion,
the first area and the second area of the photosensitive surface of the imaging part are imaged simultaneously, but the first area and the second area of the photosensitive surface acquire images with different exposure times. In practical application, the exposure time of the first area of the photosensitive surface and the second area of the photosensitive surface when the imaging part acquires the image can be set according to the actual situation of the scene and the imaging requirement.
Optionally, the first region of the photosensitive surface may be a left region of the photosensitive surface, and the second region of the photosensitive surface may be a right region of the photosensitive surface.
The imaging method of the embodiment can be applied to an endoscope apparatus, the lens of the existing endoscope apparatus can only utilize a part of pixel points of the photosensitive surface of the imaging device for imaging, as shown in fig. 3(a), fig. 3(a) is a schematic diagram of the photosensitive surface of the imaging device and the imaging area of the lens of the existing endoscope apparatus, and it can be seen that the imaging area 100 of the lens can only utilize the middle area of the photosensitive surface 101 of the imaging device, and the utilization rate is low. In the imaging method of the present embodiment, the imaging system is provided with the first light emitting portion and the second light emitting portion, as shown in fig. 3(b), fig. 3(b) is a schematic diagram of the imaging area of the imaging portion and the light sensing surface of the imaging portion in the present embodiment, a part of the entering object light is guided to enter the first area 103 of the light sensing surface 102 of the imaging portion, and a part of the entering object light is guided to enter the second area 104 of the light sensing surface 102 of the imaging portion.
S11: and synthesizing the first area and the second area of the formed image according to a preset rule, and outputting the synthesized image.
The first area image and the second area image of the formed image are collected in different exposure time respectively and have different brightness levels respectively, and the first area image and the second area image of the formed image are synthesized according to a preset rule, so that the images with the proper brightness levels in different areas of the image can be obtained.
Therefore, in the imaging method of the embodiment, the light-sensing surface of the imaging part is divided into the first area and the second area, the object light is respectively guided to enter the first area and the second area of the light-sensing surface, the first area and the second area of the light-sensing surface are respectively imaged at different exposure times at the same time, the first area and the second area of the formed image are respectively imaged at different exposure times, the images of the first area and the images of the second area are combined to obtain the image with the proper brightness level in different areas of the image, and the method can not lose the frame rate and the resolution of the image.
Compared with the existing endoscope equipment imaging method, the imaging method can fully utilize redundant pixels of the photosensitive surface of the endoscope imaging device, expand the effective information amount of each image acquisition, and realize the HDR function without losing the image frame rate and the resolution ratio on the premise of basically not changing the existing structure.
Accordingly, an embodiment of the present invention further provides an imaging device, including a lens portion, an imaging portion, and an image processing portion, where the lens portion includes a light splitting portion, a first light emitting portion, and a second light emitting portion, the light splitting portion is configured to split an incoming object light into one light path entering the first light emitting portion and another light path entering the second light emitting portion, the first light emitting portion is configured to direct light to enter a first area of a photosensitive surface of the imaging portion, the second light emitting portion is configured to direct light to enter a second area of the photosensitive surface of the imaging portion, the imaging portion is configured to image the first area of the photosensitive surface and the second area of the photosensitive surface at the same time and with different exposure times, respectively, and the image processing portion is configured to combine the first area and the second area of the formed image according to a preset rule, and output the combined image.
The lens part is used for collecting object light to enable the object light to enter, the light splitting part divides the entering object light into one path of light entering the first light emitting part and the other path of light entering the second light emitting part, the first light emitting part guides the light to enter a first area of a light sensing surface of the imaging part, and the second light emitting part guides the light to enter a second area of the light sensing surface of the imaging part. In the imaging device of the embodiment, the light-sensing surface of the imaging part is divided into a first area and a second area, the object light is respectively guided to enter the first area and the second area of the light-sensing surface, the first area and the second area of the light-sensing surface are respectively imaged at the same time in different exposure time, the first area and the second area of the formed image are respectively imaged at different exposure time, the images of the first area and the images of the second area are synthesized to obtain the image with the proper brightness level in different areas of the image, and the method can not lose the frame rate and the resolution of the image.
The present image forming apparatus will be described in detail below with reference to the accompanying drawings and specific embodiments. Referring to fig. 4, fig. 4 is a schematic view of an imaging device according to the present embodiment, and as can be seen from the figure, the imaging device includes a lens portion 20, an imaging portion 21 and an image processing portion. The lens portion 20 includes a light splitting portion 200, a first light emitting portion 201, and a second light emitting portion 202, where the light splitting portion 200 is configured to split an incident object light into one light entering the first light emitting portion 201 and the other light entering the second light emitting portion 202, the first light emitting portion 201 is configured to guide and incident light to a first area of a light sensing surface of the imaging portion 21, and the second light emitting portion 202 is configured to guide and incident light to a second area of the light sensing surface of the imaging portion 21.
It is within the scope of the present invention that the light splitting part 200 may be a prism, or the light splitting part 200 may be other light splitting elements. In one embodiment, referring to fig. 5, fig. 5 is a schematic diagram of an imaging device according to another embodiment, wherein the light splitting part 200 is a prism, a cross section of the light splitting part 200 is a polygon formed by two parallelograms which are symmetrically combined, the object light enters the light splitting part 200 and is split into two parts, one part of the light exits from the light splitting part 200 and enters the first light exiting part 201, and the other part of the light exits from the light splitting part 200 and enters the second light exiting part 202. The inclined angle of the oblique side of the parallelogram of the cross section of the prism (the included angle between the oblique side of the parallelogram and the adjacent side of the oblique side of the parallelogram) determines the distance between the two beams of light, and the smaller the inclined angle of the oblique side of the parallelogram of the cross section is, the larger the distance between the two beams of light is. Preferably, the length of the light splitting part 200 is greater than or equal to the diameter of the light beam incident to the light splitting part 200, so as to ensure that the light splitting part can effectively split all incident light and avoid light loss.
Further, referring to fig. 5, in the present embodiment, the lens portion 20 further includes a light inlet portion 203 disposed on the light incident side of the light splitting portion 200 and used for collecting the object light. The light entrance section 203 preferably collimates the entering object light into parallel light, and makes the parallel light incident on the spectroscopic section 200.
The imaging section 21 is configured to simultaneously image the first region of the photosensitive surface and the second region of the photosensitive surface at different exposure times, respectively. The image processing unit is configured to combine the first region and the second region of the formed image according to a predetermined rule and output the combined image. Optionally, the first region of the photosensitive surface is a left region of the photosensitive surface, and the second region of the photosensitive surface is a right region of the photosensitive surface.
Correspondingly, the embodiment of the invention also provides an endoscope device which comprises the imaging device.
The endoscope device of the embodiment adopts the imaging device, the light-sensing surface of the imaging part is divided into the first area and the second area, the object light is respectively guided to be incident to the first area and the second area of the light-sensing surface, the first area and the second area of the light-sensing surface are respectively imaged at the same time in different exposure time, the first area and the second area of the formed image are respectively imaged in different exposure time, the images of the first area and the second area are synthesized, the image with proper brightness level in different areas of the image can be obtained, and the method can not lose the frame rate and the resolution of the image.
The imaging method and device and the endoscope device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. An imaging method, comprising:
the first area of the photosensitive surface of the imaging part receives a part of incident light guided by the first light-emitting part of the lens part, and the second area of the photosensitive surface of the imaging part receives a part of incident light guided by the second light-emitting part of the lens part;
and synthesizing the first area and the second area of the formed image according to a preset rule, and outputting the synthesized image.
2. A method as defined in claim 1, wherein the first region of the photosensitive surface is a left region of the photosensitive surface and the second region of the photosensitive surface is a right region of the photosensitive surface.
3. The lens part comprises a light splitting part, a first light emitting part and a second light emitting part, the light splitting part is used for splitting incident object light into one path of light entering the first light emitting part and the other path of light entering the second light emitting part, the first light emitting part is used for guiding light to enter a first area of a photosensitive surface of the imaging part, the second light emitting part is used for guiding light to enter a second area of the photosensitive surface of the imaging part, the imaging part is used for imaging the first area and the second area of the photosensitive surface simultaneously at different exposure times, and the image processing part is used for combining the first area and the second area of the formed image according to a preset rule and outputting the combined image.
4. An imaging device according to claim 3, wherein the light-splitting part is a prism, and a cross section of the light-splitting part is a polygon symmetrically combined by two parallelograms.
5. An imaging apparatus according to claim 4, wherein the length of the spectroscopic portion is equal to or greater than a diameter of a light beam incident to the spectroscopic portion.
6. An imaging device according to claim 3, wherein the lens section further includes a light entrance section provided on a light incidence side of the spectroscopic section for collecting entrance of object light.
7. An endoscopic apparatus comprising the imaging device of any one of claims 3 to 6.
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| CN201910979350.XA CN110636198A (en) | 2019-10-15 | 2019-10-15 | Imaging method and device and endoscope equipment |
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Application publication date: 20191231 |
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