WO2018028237A1

WO2018028237A1 - Image processing device and projection system

Info

Publication number: WO2018028237A1
Application number: PCT/CN2017/081259
Authority: WO
Inventors: 郭祖强; 张宝英; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2016-08-11
Filing date: 2017-04-20
Publication date: 2018-02-15
Also published as: CN107734314B; CN107734314A

Abstract

An image processing device and a projection system including same. The image processing device comprises a light emitting device, an image processing device and a light valve. The light emitting device is used for emitting at least two kinds of light that are of a first color and a second color; the image processing device is used for acquiring and analyzing image data inputted by each frame, and adjusting based on the grayscale value of the inputted image satisfying a predetermined condition; the light valve is used for modulating the light emitted by the light emitting device, on the basis of the grayscale value adjusted by the image processing device, to form a display image.

Description

Image processing device and projection system

Technical field

The present invention relates to the field of projection technologies, and in particular, to an image processing apparatus and a projection system.

Background technique

The existing projection system generally includes a light emitting device, a light valve and an image processing device, the light emitting device emits three colors of light of red, green and blue, and the image processing device acquires input image data and controls the light valve to receive the three Color light and modulate the image based on the input image data.

technical problem

However, the light-emitting device often has a problem of insufficient color light (such as insufficient red light) due to poor phosphor efficiency and aging, etc., affecting the projection screen effect of the projection system.

Technical solution

In order to solve the technical problem that the projection screen of the prior art projection system is not effective, it is necessary to provide an image processing apparatus with better picture effect.

Further, a projection system including the aforementioned image processing apparatus is provided.

An image processing apparatus, configured to acquire image data of an image to be displayed, the image data comprising a grayscale value of a first color of a pixel of the image to be displayed, and at least one type different from the first color a grayscale value of the two colors, the collection area of the first color in the image to be displayed is obtained according to the image data, and the grayscale value of the first color of the pixel in the collection area is higher than a first preset a grayscale value, and an area of the collection area is greater than a predetermined area, and a color grayscale value of a pixel of the peripheral area of the collection area in the image to be displayed is adjusted to form adjusted image data, so that the The ratio of the grayscale value of the first color after the pixel point adjustment of the peripheral region to the grayscale value of the at least one second color is smaller than that before the adjustment. The adjusted image data is used to output to a light valve to modulate an image.

Preferably, the image processing apparatus adjusts a grayscale value of the first color corresponding to a pixel point in the peripheral area to a first color adjustment grayscale value, wherein the first color adjustment grayscale value is smaller than the first a grayscale value of a color, and the first color adjustment grayscale value is a difference between a grayscale value of the first color and a first reference grayscale value.

Preferably, the image processing device gradually adjusts the grayscale value of the first color for the peripheral region in a direction away from the collection region, and the first reference grayscale value is in a direction away from the collection region Gradually become smaller.

Preferably, the first reference grayscale value of each pixel point of the peripheral region is equal.

Preferably, the first reference gray scale value is a product of an average value of the pre-adjustment gray scale values corresponding to the first color and an adjustment coefficient, and the adjustment coefficient is greater than or equal to 1/4 and less than or equal to 1/2.

Preferably, the image processing apparatus adjusts the at least one second color grayscale value corresponding to a pixel point in the peripheral area to a second color adjustment grayscale value, where an original grayscale value of the second color is greater than The at least one second color grayscale value, and the second color adjustment grayscale value is a sum of an original grayscale value of the at least one second color and a second reference grayscale value.

Preferably, the second reference gray scale value gradually becomes smaller in a direction away from the collection area.

Preferably, the second reference grayscale values of each pixel point of the peripheral region are equal.

Preferably, the second reference gray scale value is a product of an average value of the at least one second color pre-adjustment gray scale value and an adjustment coefficient, and the adjustment coefficient is greater than or equal to 1/4 and less than or equal to 1/2 .

Preferably, if the sum of the gray level value before the at least one second color adjustment and the second reference gray level value exceeds the highest gray level value of the at least one second color, the at least one The highest grayscale value of the second color is used as the second color adjustment grayscale value.

Preferably, the first color is red and the at least one second color is green or blue.

Preferably, the peripheral region abuts and surrounds the outside of the collection region, and the outer contour of the peripheral region coincides with the contour of the outer side of the collection region.

A projection system comprising the foregoing image processing device and a light emitting device and a light valve, wherein the light emitting device is configured to emit the light of the first color and the at least one second color, and the light valve is used for The adjusted grayscale value of the image processing device modulates the light emitted by the light emitting device to form a display image.

Beneficial effect

Compared with the prior art, the image processing apparatus adjusts a grayscale value of a pixel point of a peripheral area of the collection area such that an average value of the first color adjustment grayscale value of each pixel point of the peripheral area is The ratio between the average values of the second color adjustment gray scale values is decreased, and further the first color brightness of the peripheral region of the collection region is decreased or the second color brightness is increased, and the collection region is according to visual characteristics of the human eye. The color contrast with the peripheral area is increased, and the user will obtain a brighter visual effect of the first color of the collection area, and improve the problem that the first color light of the original light-emitting device is insufficient to affect the projection picture effect of the projection system. .

DRAWINGS

1 is a schematic view of a projection system in a first embodiment of the present invention.

2 is a schematic plan view showing the color wheel of the color wheel shown in FIG. 1.

3 is a schematic diagram of a frame of input image to be displayed.

FIG. 4 is a schematic diagram of color adjustment compensation corresponding to the corresponding red pixel shown in FIG. 3. FIG.

Main component symbol description

投影系统 Projection system	100 100
发光装置 Illuminating device	10 10
光源 light source	11 11
色轮 Color wheel	13 13
匀光装置 Homogenizer	15 15
光阀 Light valve	20 20
图像处理装置 Image processing device	30 30
控制模组 Control module	31 31
图像解析模组 Image parsing module	35 35
投影镜头 Projection lens	40 40
输入图像 Input image	a a
第一子帧图像 First sub-frame image	a1 A1
第二子帧图像 Second sub-frame image	a2 A2
第三子帧图像 Third sub-frame image	a3 A3
汇集区域 Pooling area	91 91
外围区域 Peripheral area	93 93

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

The technical solutions in the embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings in the embodiments of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a projection system 100 according to a first embodiment of the present invention. Embodiments of the present invention provide a projection system 100 that includes a light emitting device 10, a light valve 20, an image processing device 30, and a projection lens 40. The illuminating device 10 is configured to emit light and provide display light, wherein the illuminating device 10 provides at least a light of a first color and at least one light of a second color. The light valve 20 is for selectively providing light to the projection lens 40 for image display under the control of the image processing apparatus 30. In this embodiment, the projection system 100 further includes necessary or unnecessary structural features such as a projection screen, which are not described herein.

In this embodiment, the light-emitting device 10 emits light of three colors of the first color, the second color, and the third color. Specifically, the light emitting device 10 includes a light source 11, a color wheel 13, and a light homogenizing device 15. The light source 11 is used to generate an excitation light. Preferably, the excitation light is ultraviolet light. The light source 11 can be a light emitting diode, a laser diode, or other solid state light source. The color wheel 13 is for emitting light different from the wavelength of the light source 11 according to the excitation of the light emitted from the light source 11. The light homogenizing device 15 is for receiving the light emitted from the color wheel 13, thereby homogenizing the light.

Specifically, please refer to FIG. 2 , wherein FIG. 2 is a schematic plan view of the color wheel 13 of FIG. 1 . The color wheel 13 carries a wavelength converting material. The color wheel 13 is rotated by driving of a driving device (not shown).

The color wheel 13 is a substantially disk-shaped color wheel structure including a first segment 131, a second segment 133, and a third segment 135. The three segments are fan-shaped structures having the same area. .

Wherein, the three segments on the color wheel 13 are respectively provided with different wavelength conversion materials, wherein the first segment 131 can convert the incident light into the first color light; the second segment 133 can convert the incident light into the second color. Light; third segment 135 converts incident light into a third color of light. The wavelength converting material may be a phosphor, a quantum dot material, or other material that is capable of converting excitation light into a suitable color.

In this embodiment, the first color light is red light, the second color light is green light, and the third color light is blue light. In this embodiment, the first color light wavelength conversion material layer is a red phosphor, the second color light wavelength conversion material layer is a green phosphor, and the third color light wavelength conversion material layer is a blue phosphor. .

Alternatively, in other embodiments of the present invention, when the light source 11 is a blue excitation light source, the third segment 133 corresponding to the color wheel 13 may not need to be provided with a wavelength-converted phosphor, and only needs to be provided with a scattering material. The blue light emitted by the third segment of the color wheel 13 is relatively uniform, or the third segment 133 is directly disposed as a light transmitting layer, thereby causing the light emitted from the light source 11.

The light valve 20 is located in a transmission path of the light emitted from the color wheel 13. The light emitted from the color wheel 13 can be incident on the light valve 20. The first color light, the second color light, and the third color light modulated by the light valve 20 reach the projection lens to project a display image. It can be understood that the light valve 20 can be a liquid crystal display module (Liquid Crystal Display, LCD), liquid crystal display module and CMOS integrated circuit combined with reflective display module (Liquid Crystal on Silicon, LCoS), Digital Micromirror Device (DMD), etc.

The image processing device 30 includes a control module 31 and an image analysis module 35. The control module 31 is configured to turn on or off the light source 11, drive and control the movement of the color wheel 13, and image modulation.

The image parsing module 35 receives the image signal and performs parsing to obtain image data corresponding to each pixel in each image to be displayed, wherein the image data includes each pixel in the image to be displayed. Corresponding grayscale values for each color. Further, the image analysis module 35 further performs modulation processing on the image data according to an output signal of the control module 31.

The image analysis module 35 acquires image data, the image data includes a grayscale value of a first color of a pixel of the image to be displayed, and at least one second color different from the first color. Grayscale value. In this embodiment, the image data includes a first color of each pixel of the image, and a grayscale value corresponding to the second color and the third color.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a frame input image to be displayed. The input image a to be displayed for each frame includes a first subframe image a1, a second subframe image a2, and a third subframe image a3 of different colors. The first subframe image a1 corresponds to a red pixel of a first color, the second subframe image a2 corresponds to a green pixel of a second color, and the third subframe image a3 corresponds to a blue pixel of a third color. It can be understood that the first subframe image a1, the second subframe image a2, and the third subframe image a3 are combined to form an input image a to be displayed, and color display is realized, and at the same time, the three subframe images are respectively in time sequence. Transfer to the projection lens 40.

For further reference, please refer to FIG. 4 , where FIG. 4 is a schematic diagram of adjustment compensation for the gray scale corresponding to the first color pixel shown in FIG. 3 .

First, a collection area 91 is defined corresponding to the input image a, and the first color original gray scale value corresponding to the continuous pixel points of the input image is higher than a first preset gray scale and the area occupied by the consecutive pixel points is larger than A predetermined area, in other words, the grayscale value of the corresponding collection area 91 in the first subframe image a1 is higher than the first preset gray level.

It can be understood that the collection area 91 corresponds to the same coordinate position of the first subframe image a1, the second subframe image a2, and the third subframe image a3 in the three subframe images. It should be noted that in the present embodiment, the coordinate position of the collection region 91 in the input image a is only a schematic representation. In another embodiment of the present invention, the collection region 91 may be located at any position of the input image a, and is not limited thereto. At the same time, the number of the collection areas 91 is not limited to one, and the number may be two, three or other quantities.

Further, a region defining abutting and annularly enclosing the collection region 91 is a peripheral region 93, and an outer contour of the peripheral region 93 coincides with a contour of the outer side of the collection region 91, that is, an outer contour of the peripheral region 93 The outline of the outer side of the collection area 91 has the same shape and different size. In other words, the outline of the outer side of the collection area 91 is formed such that the outer contour of the outer peripheral area 93 is enlarged in proportion. Alternatively, in other modified embodiments of the present invention, the peripheral region 93 may surround the collection region 91 without being closed.

The image parsing module 35 performs parsing according to the input image data, so as to determine whether the aggregation region 91 satisfies the first color, and the original grayscale value is higher than the first preset grayscale and the area occupied by the continuous pixel is larger than Predicted area. When the collection area 91 satisfies the foregoing conditions, the image analysis module 35 outputs a first adjustment signal to the control module 31, and the control module 31 pairs the second and third colors in the peripheral area 93 according to the first adjustment signal. The original grayscale value is adjusted to reduce the luminance ratio between the first color and the second color and the third color in the peripheral region 93, for example, to decrease the grayscale value of the first color, or to increase the second color and the third color. The gray scale value, otherwise, when the collection area 91 does not satisfy the foregoing conditions, the control module 31 and the image analysis module 35 do not need the original gray scale of the first color, the second color, and the third color in the peripheral area 93. The value is adjusted.

The ratio between the average of the original grayscale values of the first color and the average of the other grayscale values of the second color or the third color is defined as the first initial value. When the control module 31 receives the first adjustment signal, the first initial value is adjusted to a first adjustment value, wherein the first adjustment value is smaller than the first initial value.

Specifically, the first color original grayscale value of the at least one pixel corresponding to the peripheral region 93 is adjusted to the first color adjustment grayscale value, so that the first color of each pixel of the peripheral region 93 adjusts the grayscale value. The ratio between the average value of the second color and the average value of the second color adjustment grayscale value is the first adjustment value.

The first color adjustment grayscale value is smaller than the first color original grayscale value, and the first color adjustment value may be a difference between the first color original grayscale value and a first reference grayscale value, wherein the first A reference gray scale value is a positive integer. Therefore, the adjusted grayscale value of the first color in the peripheral area 93 is smaller than the grayscale value before the adjustment, so that the first color in the peripheral area 93 is compared with the second color and the third color. When the brightness ratio is relatively reduced, the brightness value of the first color in the collection area 91 is increased with respect to the peripheral area 93 to achieve visual compensation of the first color to the collection area 91, thereby improving the visual effect of the first color.

In this embodiment, the first reference grayscale value gradually becomes smaller in a direction away from the collecting region 91, so that the first color visual effect is smoothly compensated for the transition.

Optionally, the corresponding first reference grayscale values in the peripheral area 93 are equal, and the size of the first reference grayscale value may be selected according to an actual adjustment effect of the image, where the first reference grayscale value is the first 1/2, 1/3, or 1/4 of the average grayscale value of the color original grayscale value. In other words, if the average grayscale value of the first color original grayscale value is Y1, the first reference grayscale value is the product of the average value Y1 of the first color original grayscale value and an adjustment coefficient, the adjustment coefficient It is 1/4 or more and 1/2 or less. Since the corresponding first reference grayscale values in the peripheral area 93 are equal, the data processing complexity of the image parsing module 35 can be effectively reduced.

Optionally, in the second embodiment of the present invention, the second color original grayscale value of the at least one pixel corresponding to the peripheral region 93 is adjusted to the second color adjustment grayscale value, so that each of the peripheral regions 93 The ratio between the average of the first color adjustment grayscale value of the pixel and the average of the second color adjustment grayscale value is the first adjustment value. The second color adjustment grayscale value is greater than the second color original grayscale value, and the second color adjustment value may be a sum of the second color original grayscale value and a second reference grayscale value. It can be understood that the second reference gray scale value is also a positive integer.

Therefore, the grayscale value corresponding to the adjusted second color in the peripheral area 93 is larger than the grayscale value before the adjustment, so that the brightness of the first color and the second color ratio in the peripheral area 93 are relatively decreased. Then, the brightness value of the first color in the collection area 91 is increased relative to the peripheral area 93 to achieve visual compensation of the first color to the collection area 91, and to improve the visual effect of the first color.

In this embodiment, the second reference grayscale value gradually becomes smaller in a direction away from the collecting region 91, so that the first color visual effect is smoothly compensated for the transition.

Preferably, when the sum of the second color original grayscale value and the second reference grayscale value is greater than the second color highest grayscale value, ie, 255 grayscale, the second color highest grayscale is adjusted as the second color Grayscale value.

Preferably, the second reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, and the size of the second reference grayscale value may be selected according to an actual adjustment effect of the image, where the second reference grayscale value is 1/2, 1/3 or 1/4 of the average grayscale value of the original grayscale value of the second color. If the average grayscale value of the original grayscale value of the second color is Y2, the second reference grayscale value is The product of the average value Y2 of the original gray scale value of the second color and an adjustment coefficient, the adjustment coefficient being greater than or equal to 1/4 and less than or equal to 1/2. The second reference gray scale values corresponding to each pixel point in the peripheral area 93 are equal to reduce the data processing complexity of the image parsing module 35.

Optionally, in the third embodiment of the present invention, the third color original grayscale value of the at least one pixel corresponding to the peripheral region 93 is adjusted to the third color adjustment grayscale value, so that each of the peripheral regions 93 The ratio between the average of the first color adjustment grayscale value of the pixel and the average of the third color adjustment grayscale value is the first adjustment value. The third color adjustment grayscale value is greater than the third color original grayscale value, and the third color adjustment value may be a sum of the third color original grayscale value and a third reference grayscale value. It can be understood that the third reference gray scale value is also a positive integer.

Therefore, the grayscale value corresponding to the adjusted third color in the peripheral region 93 is larger than the grayscale value before the adjustment, so that the luminance of the first color and the third color ratio in the peripheral region 93 are relatively decreased. The brightness value of the first color in the collection area 91 is increased relative to the peripheral area 93, thereby visually compensating the collection area 91 for the first color, improving the visual effect of the first color.

In this embodiment, the third reference gray scale value gradually decreases along a direction away from the collection area.

Preferably, when the sum of the third color original grayscale value and the third reference grayscale value is greater than the third color highest grayscale value, ie, 255 grayscale, the third color highest grayscale is adjusted as the third color Grayscale value.

Preferably, the third reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, and the size of the third reference grayscale value may be selected according to an actual adjustment effect of the image, where the third reference grayscale value is 1/2, 1/3 or 1/4 of the average grayscale value of the original grayscale value of the third color. If the average grayscale value of the original grayscale value of the third color is Y3, the third reference grayscale value is The product of the average value Y3 of the original grayscale value of the third color and an adjustment coefficient, the adjustment coefficient being greater than or equal to 1/4 and less than or equal to 1/2. The third reference grayscale values corresponding to each pixel point in the peripheral area 93 are equal to reduce the data processing complexity of the image parsing module 35.

Optionally, in the fourth embodiment of the present invention, the second color original gray scale value corresponding to the at least one pixel point of the peripheral area 93 is adjusted to the second color adjustment gray scale value, and the third color original gray scale value is used. Adjusting to the third color adjustment grayscale value such that the ratio between the average of the first color adjustment grayscale value of each pixel point of the peripheral region 93 and the average of the second and third color adjustment grayscale values Is the first adjustment value. The second color adjustment grayscale value is greater than the second color original grayscale value, and the second color adjustment value may be a sum of the second color original grayscale value and the second reference grayscale value, the third The color adjustment grayscale value is greater than the third color original grayscale value, and the third color adjustment value may be a sum of the third color original grayscale value and the third reference grayscale value.

Therefore, the adjusted grayscale values of the second and third colors in the peripheral region 93 are larger than the grayscale values before the adjustment, so that the brightness of the first color in the peripheral region 93 is the second and third colors. The ratio is relatively reduced such that the luminance value of the first color in the collection region 91 is increased relative to the peripheral region 93, thereby visually compensating the collection region 91 for the first color, improving the visual effect of the first color.

In this embodiment, the second and third reference grayscale values gradually decrease along a direction away from the collection region.

Preferably, when the sum of the second color original grayscale value and the second reference grayscale value is greater than the second color highest grayscale value, ie, 255 grayscale, the second color highest grayscale is adjusted as the second color Grayscale value. Meanwhile, when the sum of the third color original grayscale value and the third reference grayscale value is greater than the third color highest grayscale value, that is, 255 grayscale, the third color highest grayscale is used as the third color adjustment gray. Order value.

Preferably, the second reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, the third reference grayscale value corresponding to each pixel point is equal, and the size of the second and third reference grayscale values may be according to the image. The actual adjustment effect is selected, for example, 1/2, 1/3 or 1/4 of the average grayscale value of the first, second, and third color original grayscale values, respectively, to reduce the image resolution mode. Group 35 data processing complexity.

In a fifth embodiment of the present invention, the first color original grayscale value corresponding to at least one pixel corresponding to the peripheral area 93 is adjusted to the first color adjustment grayscale value, and the second color original gray is grayed out. Adjusting the step value to the second color adjustment gray scale value such that the ratio between the average value of the first color adjustment gray scale value of each pixel point of the peripheral region 93 and the average value of the second color adjustment gray scale value is The first adjustment value. The first color adjustment grayscale value is smaller than the first color original grayscale value, and the first color adjustment value may be a difference between the first color original grayscale value and the first reference grayscale value, and the second color adjustment The grayscale value is greater than the second color original grayscale value, and the second colortone adjustment value may be the sum of the second color original grayscale value and a second reference grayscale value.

Therefore, the grayscale value corresponding to the adjusted first color in the peripheral area 93 is smaller than the grayscale value before the adjustment, and the grayscale value corresponding to the second color is larger than the grayscale value before the adjustment. Thereby, the brightness of the first color in the peripheral area 93 is relatively reduced from the second color ratio, so that the brightness value of the first color in the collection area 91 is increased with respect to the peripheral area 93, thereby visually achieving the first to the collection area 91. The color compensation compensates for the visual effect of the first color.

In this embodiment, the first and second reference grayscale values gradually decrease along a direction away from the collection region.

Preferably, the first reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, the second reference grayscale value corresponding to each pixel point is equal, and the size of the first and second reference grayscale values may be according to the image. The actual adjustment effect is selected, for example, 1/2, 1/3 or 1/4 of the average grayscale value of the first and second color original grayscale values, respectively, to reduce the image analysis module 35. Data processing complexity.

In a sixth embodiment of the present invention, the first color original grayscale value corresponding to at least one pixel corresponding to the peripheral region 93 is adjusted to the first color adjustment grayscale value, and the third color original gray is grayed out. Adjusting the step value to the third color adjustment grayscale value such that the ratio between the average value of the first color adjustment grayscale value of each pixel point of the peripheral region 93 and the average value of the third color adjustment grayscale value is The first adjustment value. The first color adjustment grayscale value is smaller than the first color original grayscale value, and the first color adjustment value may be a difference between the first color original grayscale value and the first reference grayscale value, and at the same time, the third color adjustment The grayscale value is greater than the third color original grayscale value, and the third colortone adjustment value may be the sum of the third color original grayscale value and a third reference grayscale value.

Therefore, the grayscale value corresponding to the adjusted first color in the peripheral area 93 is smaller than the grayscale value before the adjustment, and the grayscale value corresponding to the third color is larger than the grayscale value before the adjustment. Thereby, the brightness of the first color in the peripheral area 93 is relatively reduced with the third color ratio, so that the brightness value of the first color in the collection area 91 is increased with respect to the peripheral area 93, thereby visually achieving the first to the collection area 91. The color compensation compensates for the visual effect of the first color.

In this embodiment, the first and third reference gray scale values gradually decrease along a direction away from the collection region.

Preferably, the first reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, the third reference grayscale value corresponding to each pixel point is equal, and the size of the first and third reference grayscale values may be according to the image. The actual adjustment effect is selected, for example, 1/2, 1/3 or 1/4 of the average grayscale value of the first and third color original grayscale values, respectively, to reduce the image analysis module 35. Data processing complexity.

In a seventh embodiment of the present invention, the first color original grayscale value corresponding to at least one pixel corresponding to the peripheral region 93 is adjusted to the first color adjustment grayscale value, and the second color original gray is grayed out. Adjusting the step value to the second color adjustment grayscale value, and adjusting the third color original grayscale value to the third color adjustment grayscale value, so that the first color of each pixel of the peripheral region 93 adjusts the grayscale value The ratio between the average value of the second and third color adjustment grayscale values is the first adjustment value. The first color adjustment grayscale value is smaller than the first color original grayscale value, and the first color adjustment value may be a difference between the first color original grayscale value and the first reference grayscale value, and the second color adjustment The grayscale value is greater than the second color original grayscale value, and the second color adjustment value may be a sum of the second color original grayscale value and the second reference grayscale value, and the third color adjusted grayscale value is greater than The third color original grayscale value, the third color adjustment value may be a sum of the third color original grayscale value and the third reference grayscale value.

Therefore, the grayscale value corresponding to the adjusted first color in the peripheral area 93 is smaller than the grayscale value before the adjustment, and the grayscale value corresponding to the second and third colors is compared with the grayscale before the adjustment. The value is large such that the luminance of the first color in the peripheral region 93 is relatively reduced from the ratio of the second and third colors, so that the luminance value of the first color in the collection region 91 is increased relative to the peripheral region 93, thereby visually concentrating The area 91 reaches the compensation for the first color, improving the visual effect of the first color.

In this embodiment, the first, second, and third reference grayscale values gradually decrease along a direction away from the collection region.

Preferably, the first reference grayscale value corresponding to each pixel point in the peripheral area 93 is equal, the second reference grayscale value corresponding to each pixel point is equal, and the third reference grayscale value corresponding to each pixel point is equal, and The size of the first, second, and third reference grayscale values may be selected according to an actual adjustment effect of the image, for example, may be an average grayscale value of the first, second, and third color original grayscale values, respectively. /2, 1/3 or 1/4 to reduce the data processing complexity of the image analysis module 35.

Compared with the prior art, the projection system 100 adjusts the grayscale value of the pixel points of the peripheral region 93 of the collection region 91 such that the first color of each pixel of the peripheral region 93 adjusts the grayscale value. The ratio between the average value and the average value of the second color adjustment gray scale value decreases, and the first color brightness of the peripheral region 93 of the collection region 91 decreases or the brightness of the second color increases, according to the visual characteristics of the human eye. The color matching degree between the collection area 91 and its peripheral area 93 is increased, and the user will obtain a brighter visual effect of the first color of the collection area 91, improving the influence of the first color light in the light-emitting device 10. The problem of the projected picture effect of the projection system 100 is described.

Claims

1. An image processing apparatus characterized by:

The image processing device is configured to acquire image data of an image to be displayed, the image data comprising a grayscale value of a first color of a pixel of the image to be displayed and at least one second different from the first color a grayscale value of the color, the collection area of the first color in the image to be displayed is obtained according to the image data, and the original grayscale value of the first color of the pixel in the collection area is higher than a first preset a grayscale value, and an area of the collection area is greater than a predetermined area, and a color grayscale value of a pixel of the peripheral area of the collection area in the image to be displayed is adjusted to form adjusted image data, so that the The ratio of the grayscale value of the first color of the peripheral region to the grayscale value of the at least one second color is smaller than that before the adjustment;

The adjusted image data is used to output to a light valve to modulate an image.

The image processing device according to claim 1, wherein the image processing device adjusts a grayscale value of the first color corresponding to a pixel point in the peripheral region by a first color original grayscale value Adjusting a grayscale value for the first color, the first color adjustment grayscale value is smaller than the first color original grayscale value, and the first color adjustment grayscale value is the first color original grayscale value and The difference between the first reference gray scale values.

The image processing device according to claim 2, wherein the image processing device gradually adjusts the grayscale value of the first color for the peripheral region in a direction away from the collection region, and The first reference gray scale value tapers in a direction away from the pooling region.

4. The image processing apparatus according to claim 2, wherein the first reference gray scale value of each pixel point of the peripheral area is equal.

The image processing device according to claim 2, wherein the first reference gray scale value is a product of an average value of the pre-adjustment gray scale values corresponding to the first color and an adjustment coefficient, The adjustment factor is greater than or equal to 1/4 and less than or equal to 1/2.

The image processing device according to claim 1, wherein the image processing device adjusts a grayscale value of the at least one second color corresponding to a pixel point in the peripheral region to a second color adjustment a grayscale value, the second color adjustment grayscale value is greater than an original grayscale value of the at least one second color, and the second color adjustment grayscale value is an original of the at least one second color The sum of the grayscale value and a second reference grayscale value.

7. The image processing apparatus according to claim 6, wherein the second reference gray scale value gradually becomes smaller in a direction away from the collection area.

8. The image processing apparatus according to claim 6, wherein the second reference grayscale value of each pixel point of the peripheral region is equal.

9. The image processing apparatus according to claim 6, wherein said second reference gray scale value is a product of an average value of said at least one second color pre-adjustment gray scale value and an adjustment coefficient, said adjustment The coefficient is greater than or equal to 1/4 and less than or equal to 1/2.

The image processing device according to claim 6, wherein if the sum of the grayscale value before the at least one second color adjustment and the second reference grayscale value exceeds the at least one The highest grayscale value of the two colors, the highest grayscale value of the at least one second color is used as the second color adjustment grayscale value.

11. The image processing apparatus according to claim 1, wherein the first color is red and the at least one second color is green or blue.

The image processing apparatus according to any one of claims 1 to 11, wherein the peripheral area is adjacent to and surrounds the outside of the collection area, and an outer contour of the peripheral area is identical to an outer contour of the collection area. .

A projection system comprising the image processing device according to any one of claims 1 to 12, and a light-emitting device and a light valve, the light-emitting device for emitting the first color and at least one a light of two colors, wherein the light valve is configured to modulate light emitted by the light emitting device according to the adjusted grayscale value of the image processing device to form a display image.