Parallel time-space domain joint compression imaging method and device adopting DMD

A compressed imaging, space-time domain technology, applied in image communication, color TV parts, TV system parts, etc., can solve the problems of difficult image acquisition and high cost of imaging equipment

Active Publication Date: 2019-12-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that it is difficult to obtain images with high temporal resolution and high spatial resolution or the cost of imaging equipment is high, and proposes a method and device for compressing imaging in both time domain and space domain

Method used

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  • Parallel time-space domain joint compression imaging method and device adopting DMD
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Experimental program
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Embodiment 1

[0052] like figure 1 As shown, 8 frames of images with a resolution of 256×256, a pixel depth of 8 bits, and continuous slight changes are modulated using a spatiotemporal domain modulation template, and a frame of low-resolution images with a resolution of 64×64 is obtained after down-sampling. Finally, use the restoration algorithm to recover 2 frames of restored images with a resolution of 256×256 from the 64×64 low-resolution images, so as to achieve a 16-fold spatial resolution from the collected low-speed low-resolution images to the restored images (4 ×4), the time resolution is improved by 2 times.

[0053] Step 1: The moving target or dynamic scene is imaged on the DMD through the optical system.

[0054] The object used in this embodiment is the original image X with 8 frames of continuous slight changes, the resolution is 256×256, and the pixel depth is 8 bits. Divide X into two groups, and record the first four frames as P 1 , and the group of the last four fram...

Embodiment 2

[0085] The operation step of embodiment 2 is the same as figure 1 As shown in , the difference is that the time domain compression ratio is improved and the shooting target is changed. The target resolution is changed to 128×128, the air domain compression ratio is 4:1, and the time domain compression ratio is 12:1, that is, k1=4, k2=12. Since k2 / k1=3, finally 3 frames of high-resolution images will be recovered from the modulated low-resolution images. which is figure 1 X should be 12 frames of images, divided into 3 groups, and finally recover 3 frames of high-resolution images ( figure 1 Add 4 frames of images after P2 in X as P3, Also add a frame P3). In addition, the control signals of DMD and camera should also change accordingly, such as Figure 4 As shown in b, DMD should contain 12 high levels, and the exposure time of the camera should be lengthened accordingly. All the other steps are the same as in Example 1. Figure 8 a is a low-speed low-resolution image ...

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Abstract

The invention provides a parallel time-space domain joint compression imaging method and device adopting a DMD. A space domain compression imaging technology and a time domain compression imaging technology are combined, a digital micromirror device DMD is utilized to carry out time domain modulation on target light information while space domain modulation is carried out, and a detector only needs to receive a low-speed low-resolution image subjected to time domain and space domain modulation; finally, the original high-speed high-resolution image is recovered from the modulated image by using a recovery algorithm. According to the method, the spatial resolution and the temporal resolution of the camera can be expanded at the same time, and an image sequence with higher temporal resolution and spatial resolution can be obtained on the premise of not changing the camera. Meanwhile, time-space domain compression imaging has a very high compression ratio, so that the acquired data volumecan be remarkably reduced, the requirement of a high-speed high-resolution video on the transmission bandwidth is reduced, and a high-speed high-resolution imaging system is lower in cost and easierto realize.

Description

technical field [0001] The present invention relates to a parallel time-space-domain combined compressed imaging method and device using DMD, in particular to an imaging method and implementation system using digital micromirror array DMD and low-speed and low-resolution camera combined time-space-domain compressed sensing imaging method and implementation system, which belongs to compression imaging and high-speed high-resolution imaging. Background technique [0002] High temporal resolution and high spatial resolution have always been the goal pursued tirelessly in the field of imaging. High spatial resolution can obtain more detailed information of the target scene; high temporal resolution can obtain more detailed change process of dynamic targets. However, there are technical difficulties or high costs in the manufacture of image acquisition devices with high temporal resolution and high spatial resolution. This is mainly because under the condition of certain data r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/235H04N5/353
CPCH04N23/60H04N23/73H04N25/53
Inventor 柯钧张临夏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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