CN108600720B - Light source, device, system and method for HDR projection of image signals - Google Patents
Light source, device, system and method for HDR projection of image signals Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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Abstract
The invention discloses a light source for HDR projection of image signals, which comprises a first light source for providing a first light beam; the first optical machine is positioned on the optical path of the first light beam and is used for forming a non-uniform light beam based on an input reference signal and the first light beam projection so as to obtain a projection light beam.
Description
Technical Field
The invention relates to the technical field of projection. And more particularly to a light source, apparatus, system and method for HDR projection of image signals.
Background
Currently, many projectors generally use a uniform light beam as a projection light beam, and the projection device controls an imaging chip to project an image corresponding to an image signal according to the image signal to be projected by irradiating the imaging chip of the projection device with the uniform light beam.
With the increasing demands of people for visual products, high contrast (High Contrast Ratio, or HCR) and high dynamic range imaging (High Dynamic Range Imaging, HDRI or HDR) technologies are proposed, where the HDR technology can achieve a larger exposure dynamic range (i.e. a larger contrast) than the conventional digital image technology, so as to improve the definition of the image bright and dark displays and improve the projection display effect. However, current film projection devices do not have HCR and HDR, and film images or videos are not produced in the HCR and HDR formats, so that the cinema cannot achieve the playback of truly high-contrast and high-dynamic range films.
Disclosure of Invention
An object of the present invention is to provide a light source for HDR projection of an image signal, which forms a non-uniform light beam based on a reference signal as a light source for projection, so that both brightness and darkness of the image signal are enhanced, and high dynamic range display of the image signal is realized. It is a further object of the present invention to provide an image signal HDR projection apparatus, and a further object of the present invention to provide an image signal HDR projection system, and a further object of the present invention to provide an image signal HDR projection method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a light source for HDR projection of image signals, which comprises
A first light source for providing a first light beam;
the first optical machine is positioned on the optical path of the first light beam and is used for forming a non-uniform light beam based on the input reference signal and the first light beam projection, so as to obtain a projection light beam.
Preferably, the method comprises the steps of,
and a second light beam which is overlapped with the non-uniform light beam to obtain a projection light beam is also formed in the light source.
Preferably, the method comprises the steps of,
a first spectroscope is arranged on the light path of the non-uniform light beam;
the non-uniform light beam is transmitted through the first spectroscope, and the second light beam is reflected by the first spectroscope and overlapped with the transmitted non-uniform light beam to obtain a projection light beam.
Preferably, the method comprises the steps of,
the light intensity of the second light beam is larger than or equal to that of the first light beam.
Preferably, the method comprises the steps of,
the light source further comprises a second light source forming a second light beam; or alternatively
The second light beam is obtained by splitting the first light beam.
Preferably, the method comprises the steps of,
the first light source comprises a first laser module for generating a first laser beam and a first light homogenizing rod for homogenizing the first laser beam to form the first beam.
Preferably, the method comprises the steps of,
the light source further comprises a second light source forming a second light beam;
the second light source comprises a second laser module for generating a second laser beam and a second light homogenizing rod for homogenizing the second laser beam to form a second beam.
Preferably, the first optical machine is an LCOS chip.
Preferably, the reference signal is a gray-scale signal of the image signal.
Preferably, the method comprises the steps of,
the reference signal is obtained by scaling the gray-scale signal of the image signal to the full brightness range.
Preferably, the range of data values in the gray-scale signal is a-b, and the scale expansion to the full brightness range is
a＝0
b＝255
c＝(a+b)(c-a)/(b-a)(a≤c≤(a+b)/2) (a≤c≤(a+b)/2)
d＝255-(b-d)(a+b)/(b-a)((a+b)/2≤d≤b) ((a+b)/2≤d≤b)
Another aspect of the invention discloses an image signal HDR projection apparatus comprising
A light source, a second light engine and a lens for HDR projection of image signals as described above;
the second optical machine is located on the optical path of the projection beam and is used for forming an HDR image based on the input image signal and the projection beam through the lens.
Preferably, the second optical machine is LCOS, DLP or LCD chip.
In a further aspect the invention discloses an image signal HDR projection system comprising an image signal HDR projection apparatus as described above, a processor, a first video decoder electrically connected to a first optomachine, a second video decoder electrically connected to a second optomachine, and a synchronizer for time synchronizing the first video decoder and the second video decoder;
the processor is used for extracting a reference file from the video file and transmitting the reference file to the first video decoder, and extracting an image file from the video file and transmitting the image file to the second video decoder;
the first video decoder is used for decoding the reference file to obtain a reference signal and inputting the reference signal into a first optical machine;
the second video decoder is used for decoding the image file to obtain an image signal and inputting the image signal into a second optical machine.
Preferably, the video file is a digital cinema package, and the CPL file, the reference file and the image file are stored in the digital cinema package;
the reference file comprises a plurality of frames of reference images;
the image file comprises a plurality of frames of source images;
the CPL file includes association information associating the multi-frame reference image with the multi-frame source image.
The invention also discloses an image signal HDR projection method,
forming a first light beam;
forming a non-uniform beam based on the reference signal and the first beam projection to obtain a projected beam;
an HDR image is formed based on the image signal and the projection beam projection.
Preferably, the obtaining the projection beam further comprises
Forming a second light beam;
and superposing the second light beam and the non-uniform light beam to obtain a projection light beam.
The beneficial effects of the invention are as follows:
the light source for HDR projection of the image signals forms the non-uniform light beam as the projected light source based on the first light beam and the reference signal, the image signals are projected to form images under the condition of the non-uniform light beam light source, and the reference signal is arranged to enhance the bright and dark display areas on the image signals obtained by projection, so that the high dynamic range display of the image signals is realized, the projected light source is improved, the cost is reduced, and the expansion applicability is strong.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic diagram of an embodiment of an HDR projection apparatus of an image signal in accordance with the present invention.
Fig. 2 shows a schematic diagram of another embodiment of an HDR projection apparatus of an image signal in accordance with the present invention.
Fig. 3 shows a schematic diagram of another embodiment of an HDR projection apparatus of an image signal in accordance with the present invention.
Fig. 4 is a schematic diagram of processing a gray-scale signal according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of an image signal in an embodiment of the invention.
Fig. 6 shows a schematic view of a projected image of an image signal in an embodiment of the invention.
Fig. 7 shows a schematic diagram of an embodiment of an HDR projection system of an image signal in accordance with the present invention.
Fig. 8 shows a schematic diagram of an embodiment of an HDR projection method of an image signal in accordance with the present invention.
Fig. 9 shows a schematic diagram of another embodiment of an HDR projection method of an image signal in accordance with the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Fig. 1 shows a specific embodiment of a light source for HDR projection of an image signal, in this embodiment comprising a first light source and a first optical machine located in the optical path of the first light beam. Wherein the first light source can provide a first light beam. The first optical machine can form a non-uniform light beam based on the input reference signal and the first light beam projection, so as to obtain a projection light beam. In the invention, the non-uniform light beam is formed based on the first light beam and the reference signal to be used as a projection light source for projecting an image or video, the image signal is projected to form an image under the condition of the non-uniform light beam light source, the original image signal is enhanced, the reference signal is arranged, the bright and dark display area on the display image obtained by projection is enhanced, the high dynamic range display of the image signal is realized, the projection light source is improved, the image acquisition and processing are not required to be carried out by adopting expensive image processing equipment, the cost is reduced, and the light source can be used for various projection equipment and has strong expansion applicability.
In other embodiments, a second beam that is superimposed with the non-uniform beam to obtain a projection beam is further formed in the light source for HDR projection of the image signal. The second light beam can be a uniform light beam, the uniform light beam and the formed non-uniform light beam are overlapped to obtain a projection light beam, on one hand, the processing of a reference signal can be simplified, the brightness of a dark place of an image signal to be projected is not needed to be considered in the reference signal, only the brightness range of the image signal is needed to be adjusted, and the light beam is suitable for various projection equipment.
Specifically, a first beam splitter may be disposed on the optical paths of the non-uniform light beam and the second light beam, where the first beam splitter may be disposed obliquely, one surface of the first beam splitter may transmit the non-uniform light beam, and the other surface of the first beam splitter may reflect the second light beam onto the optical path of the non-uniform light beam, so as to combine the non-uniform light beam to form a projection light beam, or one surface of the first beam splitter may transmit the second light beam, and the other surface of the first beam splitter may reflect the non-uniform light beam onto the optical path of the second light beam, so as to combine the second light beam to form a projection light beam.
In one embodiment, as shown in fig. 2, a second light source may be provided in the light source for HDR projection of the image signal, which second light source may be used to form the second light beam. Similarly, the first spectroscope may be disposed on the optical path of the second light beam generated by the second light source and the optical path of the non-uniform light beam, so that the second light beam emitted by the second light source may be combined with the non-uniform light beam into a projection light beam. The second beam and the non-uniform beam are combined to form the beam for projection, so that the brightness range is further increased, high dynamic range display is possible, and the variable brightness range of the image is larger.
In this embodiment, the first light source includes a first laser module that generates a first laser beam and a first light homogenizing rod that homogenizes the first laser beam generated by the first laser module to obtain a uniform first beam.
When the second light beam is obtained from the light source, the second light beam can be obtained by splitting the light emitted from the first light source. In one embodiment, as shown in fig. 3, a second beam splitter may be disposed on the optical path of the first beam generated by the first light source, and a part of the first beam is split from the first beam to form a second beam, and the first beam passing through the second beam splitter further passes through the first optical machine to form a non-uniform beam, so that the combination of the non-uniform beam and the second beam can be realized by disposing the first beam splitter, thereby saving the number of light sources and reducing the cost under the requirement of simplifying the reference signal. In other embodiments, the first beam may be homogenized by providing a first homogenizing rod to perform the first beam on the first laser beam generated by the first light source, or the second beam splitter may be provided on a light path of the first laser beam, so that the first laser beam may be split into a second laser beam having a direction different from that of the first laser beam through the second beam splitter, and further a second homogenizing rod may be provided on a light path of the second laser beam, so that the second laser beam obtained by the beam splitting is homogenized to obtain a second beam, and the second beam may be combined with the non-uniform beam to obtain the projection beam.
Further, when a second light source is employed to provide the second light beam, the second light source may preferably also include a second laser module that generates a second laser beam and a second homogenizing rod that homogenizes the second laser beam to form the second light beam to generate a uniform second light beam for projection.
In a preferred embodiment, the first optical machine may employ an LCOS chip to project an image of the reference signal to form a non-uniform beam. Of course, in the specific implementation, a projection chip such as an LCD or DLP may be used.
In a preferred embodiment, the reference signal is a gray scale signal of the image signal. The gray level signal of the image signal can keep the brightness information of the image signal, form a non-uniform light beam corresponding to the gray level signal, then the non-uniform light beam is used as a projection light beam, the display image is further obtained based on the projection of the image signal, the non-uniform light beam based on the gray level signal can be used as a light source for projection, the corresponding gray level image of the gray level signal is further synthesized on the basis of the image corresponding to the normal image signal obtained by projection, the gray level image is consistent with the brightness distribution of the image to be displayed corresponding to the image signal, the brightness area of the image to be displayed is further enhanced, the brightness range of the finally projected display image is wider relative to the brightness range of the image to be displayed of the image signal, and the high dynamic range display of the image is realized. In order to enable the display images to display different brightness, the overall brightness of the image corresponding to the reference signal needs to be increased so as to ensure that the human eyes can see the normal display images.
In other embodiments, to further optimize the HDR display effect of the image, the reference signal may be obtained by scaling the gray scale signal of the image signal to the full luminance range. Wherein, the full brightness range is between 0 and 255.
In a preferred embodiment, as shown in fig. 4, when the range of data values in the gray-scale signal is a to b, the reference signal obtained by scaling the gray-scale signal to the full brightness range can be obtained by the following formula:
a＝0
b＝255
c＝(a+b)(c-a)/(b-a)(a≤c≤(a+b)/2) (a≤c≤(a+b)/2)
d＝255-(b-d)(a+b)/(b-a)((a+b)/2≤d≤b) ((a+b)/2≤d≤b)
fig. 5 and 6 show an original image projected by the image signal HDR projection light source in the present embodiment and a projected image obtained by projection, respectively, the projected image having a higher display range than the original image. The gray scale signal of the image signal can be further optimized through the formula, the brightness range of the gray scale signal is expanded, the non-uniform light beam corresponding to the gray scale signal is formed, a larger brightness range can be realized, and when the second light source is adopted to provide the second light beam, the highest brightness value which can be achieved by the display image can exceed the existing projection display image, so that the maximum brightness value is achieved.
According to another aspect of the invention, a specific embodiment of an image signal HDR projection apparatus is also disclosed, said apparatus comprising a light source for HDR projection of an image signal, as described above, a second light engine and a lens.
The second optical machine is located on the optical path of the projection beam and is used for forming an HDR image based on the input image signal and the projection beam through the lens. Preferably, the second optical machine may be an LCOS, DLP or LCD chip. And the original image signal input by the second optical machine is normally projected under the non-uniform projection beam of the projection light source, so as to obtain an HDR image. According to the image signal HDR projection device, the reference signal is obtained through simple processing of the image and is input into the HDR projection light source, so that HDR display of the image signal can be realized, the operation is simple, and the viewing experience of a user is greatly improved.
According to yet another aspect of the present invention, an image signal HDR projection system is disclosed, comprising an image signal HDR projection apparatus as described above, a processor, a first video decoder electrically connected to a first optical machine, a second video decoder electrically connected to a second optical machine, and a synchronizer for time synchronizing the first video decoder and the second video decoder.
The processor stores or receives externally transmitted video files, extracts reference files from the video files and transmits the reference files to the first video decoder, and extracts image files from the video files and transmits the image files to the second video decoder.
The first video decoder is used for decoding the reference file to obtain a reference signal and inputting the reference signal into a first optical machine. The second video decoder is used for decoding the image file to obtain an image signal and inputting the image signal into a second optical machine. Meanwhile, the synchronicity of signals transmitted by the first video decoder and the second video decoder is realized through the synchronizer, so that a projection light source comprising the first optical machine generates a non-uniform projection light beam corresponding to an image to be projected as a projection light source of the second optical machine, and the second optical machine projects the image to be projected on the basis of the projection light beam to obtain an HDR image.
In a preferred embodiment, the video file is a digital cinema package in which the CPL file, the reference file, and the image file are stored. The CPL file comprises association information for associating the multi-frame reference image with the multi-frame source image. The invention expands the content in the existing digital film package, the multi-frame source image of the basic video file corresponds to obtain multi-frame reference image, and the source image and the reference image corresponding to each frame are connected in parallel to obtain CPL file, the processor can respectively obtain the source image and the reference image of the corresponding frame through the CPL file, and respectively input the source image and the reference image into a first video decoder and a second video decoder, and the first video decoder and the second video decoder form reference signals after decoding and image signals are respectively input into a first optical machine and a second optical machine.
According to the same principle, according to a further aspect of the present invention, the present embodiment also discloses an image signal HDR projection method, as shown in FIG. 8, which10Comprising the following steps:
s100: forming a first light beam;
s110: a non-uniform beam is formed based on the reference signal and the first beam projection to obtain a projected beam.
S120: an HDR image is formed based on the image signal and the projection beam projection.
In another embodiment, as shown in FIG. 9, the S110 further may include
S111: a non-uniform beam is formed based on the reference signal and the first beam projection.
S112: forming a second beam.
S113: and superposing the second light beam and the non-uniform light beam to obtain a projection light beam.
The step numbers in the present embodiment are not limited to the order of steps, and the order of steps may be changed on the premise of implementing the technical scheme of the present embodiment in practical application.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (12)
1. An HDR projection system for an image signal, comprising a first projection device, a second projection device, a processor, a first video decoder electrically connected to a first optical machine, a second video decoder electrically connected to a second optical machine, and a synchronizer for time synchronizing the first video decoder and the second video decoder;
the first projection device includes:
a first light source for providing a first light beam;
the first optical machine is positioned on the optical path of the first light beam and is used for forming a non-uniform light beam based on the input reference signal and the projection of the first light beam, so as to obtain a projection light beam;
the first light source comprises a first laser module for generating a first laser beam and a first light homogenizing rod for homogenizing the first laser beam to form a first beam; the first light source is also provided with a second light beam which is overlapped with the non-uniform light beam to obtain a projection light beam;
the reference signal is a gray scale signal of the image signal;
the second projection device comprises a projection light source, a second optical machine and a lens,
the second optical machine is positioned on the optical path of the projection beam and is used for forming an HDR image based on an input image signal and the projection beam through the lens;
the processor is used for extracting a reference file from the video file and transmitting the reference file to the first video decoder, and extracting an image file from the video file and transmitting the image file to the second video decoder;
the first video decoder is used for decoding the reference file to obtain a reference signal and inputting the reference signal into a first optical machine;
the second video decoder is used for decoding the image file to obtain an image signal and inputting the image signal into a second optical machine.
2. An image signal HDR projection system in accordance with claim 1, characterized in that,
a first spectroscope is arranged on the light path of the non-uniform light beam;
the non-uniform light beam is transmitted through the first spectroscope, and the second light beam is reflected by the first spectroscope and overlapped with the transmitted non-uniform light beam to obtain a projection light beam.
3. An image signal HDR projection system in accordance with claim 1, characterized in that,
the light intensity of the second light beam is larger than or equal to that of the first light beam.
4. An image signal HDR projection system in accordance with claim 1, characterized in that,
the first light source further includes a second light source forming a second light beam; or alternatively
The second light beam is obtained by splitting the first light beam.
5. The image signal HDR projection system of claim 4, wherein,
the second light source comprises a second laser module for generating a second laser beam and a second light homogenizing rod for homogenizing the second laser beam to form a second beam.
6. The HDR projection system of claim 1, wherein said first optical engine is an LCOS chip.
7. An image signal HDR projection system in accordance with claim 1, characterized in that,
the reference signal is obtained by scaling the gray-scale signal of the image signal to the full brightness range.
8. The HDR projection system of claim 7, wherein the range of data values in the grayscale signals is a-b, and the scaling extends to a full luminance range of 0-255.
9. The HDR projection system of claim 1, wherein the second light engine is an LCOS, DLP, or LCD chip.
10. The HDR projection system of image signals in accordance with claim 1, wherein said video files are digital cinema packages having CPL files, reference files, and image files stored therein;
the reference file comprises a plurality of frames of reference images;
the image file comprises a plurality of frames of source images;
the CPL file includes association information associating the multi-frame reference image with the multi-frame source image.
11. An image signal HDR projection method applied to the system of any of the claims 1-10, characterized in that,
forming a first light beam;
forming a non-uniform beam based on the reference signal and the first beam projection to obtain a projected beam;
an HDR image is formed based on the image signal and the projection beam projection.
12. The method of HDR projection of an image signal in accordance with claim 11, wherein obtaining a projection beam further comprises
Forming a second light beam;
and superposing the second light beam and the non-uniform light beam to obtain a projection light beam.
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