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A method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging

A refresh rate, grayscale technology, applied in the imaging field, can solve the problems of difficulty, increase the frame rate, and the time cannot be too short, and achieve the effect of reducing the number of planes, increasing the total accumulated time, and improving the application prospect.

Active Publication Date: 2022-07-26
XIAMEN UNIV OF TECH
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Problems solved by technology

[0005] According to the formula, the grayscale image time per frame depends on T LSB and T w ,T w It is about 50*8=400 microseconds (global reset method), in order not to lose image details (determined by the high-frequency low-level plane), T LSB The time cannot be too short, assuming 20 microseconds, then the frame time of 256 grayscale images is 5.5ms, and the frame frequency is 182Hz. This frame rate can be reduced by reducing T LSB to improve, but t LSB Taking 20 microseconds is basically close to the limit, so it is difficult to increase the frame rate

Method used

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  • A method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging
  • A method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging
  • A method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging

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[0095] Since the standard images are all 256 gray levels (8 bit pixels, 8 bit planes), this embodiment takes the standard image as the object of description, that is, the maximum gray value Y=255. This embodiment takes K=2.

[0096] For an image data source, under the determined Y, by increasing K, choose the smallest N according to formula (4) or formula (5) to keep the inequality always true.

[0097] According to formula (4), N=7 is obtained by calculation;

[0098] According to formula (5), it is calculated that N=6, Y A =4, the N obtained by this method is the smallest;

[0099] Therefore, planes 0 to 5 are generated according to formula (5), and a supplementary plane with the same time weight as that of plane 0 is added. Since the time weight of the supplementary plane is smaller than that of the plane 6, the total time weight generated according to formula (5) must be smaller than the total time weight generated according to formula (4).

[0100]After the number of ...

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Abstract

The invention provides a method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging, and relates to the field of imaging. The method of the present invention comprises the following steps: acquiring an image data source, adjusting the number of pixels to 1 / K of the number of DMD micromirrors 2 , each pixel is displayed by a set of K×K micromirrors, where K is an integer greater than 1; according to the maximum gray value Y and K of the image data source, generate N bit planes, or generate N The bit plane plus the supplementary bit plane; according to the gray value of the pixel to be displayed and the time weight value of each bit plane, calculate the on or off data of each group of K × K micromirrors on each bit plane, and use this Controls the flipping of the micromirror to display the pixel corresponding to the gray value. A pixel is displayed by splicing K×K micromirrors, which increases the accumulated light energy of each plane of the pixel, reduces the number of planes, reduces the time to complete a grayscale display, and realizes high frame rate display images. .

Description

technical field [0001] The present invention relates to the field of imaging, and in particular, to a method, device, device and storage medium for improving the refresh rate of DMD grayscale imaging. Background technique [0002] DMD (Digital Micro-mirror Devices, Digital Micro-mirror Devices) realizes a grayscale image with rich layers through the temporal light accumulation through the binary Pulse Width Modulation (PWM: Pulse Width Modulation) technology. [0003] The binary PWM technology is expressed as figure 1 shown, call it 2 N PWM method. The binary PWM modulation formula is: T PWM =T LSB *2 (N-1) , where N is the number of bits in the pixel, T PWM is the temporal weight of each bit pixel, T LSB It is the display time of the least significant bit (LSB: Least Significant Bit). Then the light accumulation time (light energy) to complete a grayscale display is: The total time to complete a grayscale display is: where N is called the bit plane, such as 256-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/20G06T1/60G02B26/08
CPCG06T1/20G06T1/60G02B26/0833
Inventor 黄新栋刘虹
Owner XIAMEN UNIV OF TECH
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