CN102857699A - Image capturing system and method - Google Patents

Abstract

The invention provides an image capturing system and method. The image capturing system includes a light source and an image sensor. The light source is used for generating illumination light, which at least comprises a first light ray and a second light ray, and the wavelength ranges and the light intensities of the first light ray and the second light ray are different. The image sensor is used for sensing a first light ray and a second light ray reflected or transmitted by an object and generating a first sensing image and a second sensing image with different gray-scale values. The image capturing system can obtain a plurality of images with different gray scale values in one image capturing operation so as to improve the efficiency of the image capturing operation. An image capturing method is also disclosed.

Description

Image capture system and method

technical field

The present invention relates to an image capture system and method, in particular to an image capture system and method capable of simultaneously obtaining multiple images with different gray scale values.

Background technique

The rapid popularization of image capture systems enables many objects to be stored digitally. However, when there is a large difference in brightness between the bright and dark areas of the object to be captured, such as X-ray films, the existing image capture system cannot obtain a clear image of the bright and dark areas with the same image capture parameters. Detail digital images.

For example, in order to reveal details in dark areas, the user may provide brighter lighting or longer exposure time to obtain brighter digital images. At this time, the bright areas in the digital image may be overexposed and become bright white, so the details of the bright areas in the original object cannot be presented. On the contrary, in order to reveal the details of the bright area, the user may provide a darker illumination or a shorter exposure time to obtain a darker digital image. At this time, the dark area in the digital image may be underexposed and completely dark, so the details of the dark area in the original object cannot be presented. In order to overcome the above-mentioned problems, the existing image capture system uses different image capture parameters to perform multiple image capture operations on the object to obtain multiple images showing the details of the bright area and the dark area respectively. This causes the problem of inefficiency in the operation of image digitization.

To sum up, how to obtain multiple images with different gray scale values at the same time is a goal that needs to be worked hard at present.

Contents of the invention

The present invention provides an image capture system and method, which provides illumination light including first light and a second light with different wavelength ranges and light intensities, and senses the first light and the second light to generate different A first sensing image and a second sensing image of grayscale values. Therefore, the image capture system and method of the present invention can obtain multiple images with different grayscale values in one image capture operation.

An image capturing system according to an embodiment of the present invention includes a light source and an image sensor. The light source is used to generate an illuminating light, which at least includes a first light and a second light, and the wavelength range and light intensity of the first light and the second light are different. The image sensor is used to sense the first light and the second light reflected or transmitted by an object, and generate a first sensing image and a second sensing image with different grayscale values.

An image capture method according to another embodiment of the present invention includes using a light source to generate an illumination light, which at least includes a first light and a second light, and the wavelength range and light intensity of the first light and the second light are different; And, an image sensor is used to respectively sense the first light and the second light reflected or transmitted by an object, so as to generate a first sensing image and a second sensing image with different grayscale values.

The image capture system and method of the present invention can obtain multiple images with different gray scale values in one image capture operation, greatly improving the efficiency of the image capture operation.

Description of drawings

FIG. 1 is a schematic diagram showing an image capture system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an image capture system according to another embodiment of the present invention.

FIG. 3 is a flowchart showing an image capture method according to an embodiment of the present invention.

Reference number

11 light sources

111 light emitting elements

112 filter elements

11B second light-emitting element

11R first light-emitting element

12 image sensor

13 image processing module

14 optical lens

15 drive unit

151 track

20 items

LIllumination light

LB Second Ray

LM multi-wavelength light

LR First Ray

S31～S33 image capture method

Detailed ways

In the following, specific embodiments will be described in detail in conjunction with the attached drawings, and it will be easier to understand the purpose, technical content, features and effects of the present invention.

Please refer to FIG. 1 , an image capture system according to an embodiment of the present invention includes a light source 11 and an image sensor 12 . The light source 11 is used for generating an illumination light L. As shown in FIG. For example, the light source 11 can be a light emitting diode or a cold cathode fluorescent lamp (coldcathode fluorescent lamp, CCFL). In particular, the illumination light L includes at least a first light LR and a second light LB, and the wavelength ranges and light intensities of the first light LR and the second light LB are different. In one embodiment, the light source 11 may include a first light emitting element 11R and a second light emitting element 11B, which generate required first light LR and second light LB respectively. Alternatively, please refer to FIG. 2 , the light source 11 may include a light emitting element 111 and a filter element 112 . The light emitting element 111 is used for generating multi-wavelength light LM including the wavelength ranges of the first light LR and the second light LB. The filter element 112 is arranged on the light-emitting side of the light-emitting element 111 to filter the multi-wavelength light LM generated by the light-emitting element 111 to generate the required illumination light L, that is, the first light including different wavelength ranges and light intensities LR and the second light LB.

The image sensor 12 is used for sensing the first light LR and the second light LB which are reflected or transmitted by an object 20 , and generate a first sensing image and a second sensing image respectively. In one embodiment, the image sensor 12 can be a color image sensor, so it can sense red light, green light and blue light respectively. Alternatively, the image sensor may include a first image sensing element and a second image sensing element to respectively sense the first light LR and the second light LB, and generate the first sensing image and the second sensing image. image. In one embodiment, the image sensor 12 can be a charge coupled device (Charge Coupled Device, CCD), a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) sensor or a contact image sensor (Contact Image Sensor, CIS).

For example, the object 20 can be an X-ray film, a negative film or a grayscale image. The first light LR can be red light in the red wavelength range; the second light LB can be blue light in the blue wavelength range, and the light intensity of the second light LB is only 50% of the light intensity of the first light LR. When the illumination light L including the first light LR and the second light LB penetrates the object 20 and is captured by the image sensor 12, sensing the first light LR can obtain a brighter first sensing image, that is, gray A higher-level image; sensing the second light LB can obtain a darker second sensing image, that is, an image with a lower gray scale. Therefore, the image capture system of the present invention can obtain multiple images with different grayscale values in one image capture operation, thereby improving the efficiency of the image capture operation.

It should be noted that the above-mentioned embodiments only provide illumination light including red light and blue light with different light intensities, and respectively sense the red light and blue light to obtain images with two different grayscale values. However, those skilled in the art of the present invention can understand that by simultaneously providing illumination lights including multiple wavelength ranges and light intensities, such as red light, green light, and blue light, or even ultraviolet light or infrared light, more than two Images with different grayscale values.

In one embodiment, the image capture system of the present invention further includes an image processing module 13 electrically connected to the image sensor 12 . The image processing module 13 can perform various image processing on the first sensing image and the second sensing image obtained from the image sensor 12 . For example, the image processing module 13 can combine the first sensing image clearly showing the details of the dark area with the second sensing image clearly showing the details of the bright area, so as to obtain a synthesis that clearly shows the bright area and the dark area at the same time image.

In one embodiment, the image capturing system of the present invention may include an optical lens 14 disposed at the front end of the image sensor 12 . The optical lens 14 can focus the illumination light L reflected or transmitted from the object 20 to the image sensor 12 . For example, the optical lens 14 can be a rod lens or a single lens.

Please refer to FIG. 2 again, the image capturing system of the present invention may include a driving device 15 . In one embodiment, the driving device 15 can be connected to the image sensor 12 to drive the image sensor 12 to move relative to the object 20 along the track 151 to scan the object 20 . But not limited thereto, the driving device 15 can also be connected to a platform on which the object 20 is placed, and drive the platform to move the object 20 relative to the image sensor 12 , and also achieve the purpose of the image sensor 12 scanning the object 20 .

Please refer to FIG. 1 and FIG. 3 to illustrate an image capture method according to an embodiment of the present invention. First, an illumination light is generated by a light source 11 . The illumination light includes at least a first light LR and a second light LB of different wavelength ranges and light intensities ( S31 ). Next, use an image sensor 12 to respectively sense the first light LR and the second light LB reflected or transmitted by the object 20 to generate a first sensed image and a second sensed image with different grayscale values. Measure the image (S32). The detailed description of the above steps is as described above, and will not be repeated here. Preferably, the image capture method of the present invention may include an image processing step to perform image processing ( S33 ), such as image synthesis, on the first sensing image and the second sensing image with different gray scale values.

To sum up the above, the image capture system and method of the present invention can be generated by providing illumination light of various light sources including different wavelength ranges and light intensities to irradiate the object, and then sensing the light reflected from or transmitted by the object in different wavelength ranges respectively. Multiple sensing images with different grayscale values. Therefore, the image capture system and method of the present invention can obtain multiple images with different grayscale values in one image capture operation, greatly improving the efficiency of the image capture operation.

The above-described embodiments are only to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. When it is impossible to limit the patent scope of the present invention, that is, All equivalent changes or modifications made according to the spirit disclosed in the present invention should still fall within the patent scope of the present invention.

Claims (18)

1. An image capture system, characterized in that the image capture system comprises: A light source, which is used to generate an illumination light, the illumination light at least includes a first light and a second light, and the wavelength range and light intensity of the first light and the second light are different; and An image sensor, which is used to sense the first light and the second light reflected or transmitted by an object, and generate a first sensing image and a second image with different grayscale values Sensing image. 2. The image capture system according to claim 1, wherein the light source comprises: a first light emitting element, which is used to generate the first light; and A second light emitting element is used to generate the second light. 3. The image capture system according to claim 1, wherein the light source comprises: a light emitting element, which is used to generate multi-wavelength light including the wavelength range of the first light and the second light; and A filter element, which is arranged on the light-emitting side of the light-emitting element, is used to filter the multi-wavelength light to generate the illumination light. 4. The image capture system as claimed in claim 1, wherein the light source comprises a light emitting diode or a CCFL. 5. The image capture system according to claim 1, wherein the image sensor comprises: a first image sensing element, which is used to sense the first light and generate the first sensing image; and A second image sensing element is used for sensing the second light and generating the second sensing image. 6 . The image capture system according to claim 1 , wherein the image sensor comprises a charge-coupled device, a CMOS sensor, or a contact image sensor. 7. The image capture system according to claim 1, further comprising: An optical lens, which is arranged at the front end of the image sensor, is used to focus the first light and the second light reflected or transmitted by the object on the image sensor. 8. The image capture system according to claim 1, further comprising: An image processing module, which is electrically connected to the image sensor, is used for performing image processing on the first sensing image and the second sensing image. 9. The image capture system according to claim 1, further comprising: A driving device, which is used to drive the image sensor and the object to move relative to each other, so that the image sensor scans the object. 10. An image capture method, characterized in that the image capture method comprises: Using a light source to generate an illumination light, which at least includes a first light and a second light, and the wavelength range and light intensity of the first light and the second light are different; and An image sensor is used to respectively sense the first light and the second light reflected or transmitted by an object, so as to generate a first sensing image and a second sensing image with different grayscale values image. 11. The image capture method according to claim 10, wherein the light source comprises: a first light emitting element, which is used to generate the first light; and A second light emitting element is used to generate the second light. 12. The image capture method according to claim 10, wherein the light source comprises: a light emitting element, which is used to generate multi-wavelength light including the wavelength range of the first light and the second light; and A filter element, which is arranged on the light-emitting side of the light-emitting element, is used to filter the multi-wavelength light to generate the illumination light. 13. The image capture method according to claim 10, wherein the light source comprises a light emitting diode or a cold cathode fluorescent lamp. 14. The image capture method according to claim 10, wherein the image sensor comprises: a first image sensing element, which is used to sense the first light and generate the first sensing image; and A second image sensing element is used for sensing the second light and generating the second sensing image. 15. The image capturing method according to claim 10, wherein the image sensor comprises a charge coupled device, a CMOS sensor or a contact image sensor. 16. The image capture method according to claim 10, further comprising: Focusing the first light and the second light reflected or transmitted by the object on the image sensor. 17. The image capture method according to claim 10, further comprising: Image processing is performed on the first sensing image and the second sensing image. 18. The image capture method according to claim 10, further comprising: The image sensor and the object are driven to move relative to each other, so that the image sensor scans the object.

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