TW201618032A - Image processing method and display apparatus - Google Patents

Abstract

An image processing method and a display apparatus thereof are provided. The method includes: receiving a video source signal; detecting a resolution provided by the video source signal; performing a sharpness enhance process on the video source signal according to the resolution provided by the video source signal; and displaying an image of the video source signal that has undergone the sharpness enhance process on a display panel of the display apparatus.

Description

Image processing method and display device

The present invention relates to an image processing technology, and more particularly to an image processing method and display device for an ultra high resolution display panel.

4K resolution is an ultra-high resolution standard for emerging digital cinema and computer video. The name of "4K" is derived from its horizontal pixel number. At present, the resolutions conforming to the ultra-high resolution standard are 3840x2160 pixels and 4096×2160 pixels, and the display with 4K display panel is generally called ultra-high resolution display. Since the 4K display panel not only has a thin bezel on the process, but also the content of the rendered image is also high resolution, the 4K display panel can make the display thinner and provide a more detailed picture. Currently 4K displays can display up to 4 times the range of pixels in conventional displays.

Although the 4K display panel has been greatly improved in resolution specifications, in the signal source part, due to the limitation of transmission bandwidth and storage capacity, the signal source that truly provides 4K resolution is still not popular. For example, the maximum video resolution that can be stored on a Digital Video Disc (DVD) is only 720x480 pixels. The maximum resolution of the High Definition (HD) channel is only 1280x720 pixels, and the maximum resolution of Blu-ray Disc (BD) is only 1920x1080 pixels. These transmission bandwidths and storage capacities are not capable of providing a 4K resolution signal source.

When the ultra-high-resolution display receives a signal source that is less than 4K resolution, the ultra-high-resolution display needs to use an internal resolution scale function according to the received signal source to lower the resolution of the image. The resolution is magnified (for example, the resolution of 720x480 pixels is enlarged to the resolution of 4Kx2K pixels), thereby being displayed on a display panel of higher resolution. However, when the image is directly magnified, it will cause some degree of blur, which leads to a decline in display quality.

The invention provides an image processing method and a display device, which can enable different types of video input formats to have an optimal display effect on an ultra-high resolution display device.

The present invention provides an image processing method, which is applicable to a display device having a display panel. The method includes: receiving a video signal source; detecting a resolution provided by the video signal source; and detecting the video signal according to the resolution provided by the video signal source. The source performs sharpening processing; and displays an image corresponding to the sharpened video signal source on the display panel.

The invention further provides a display device comprising a receiving unit, a display panel and a control unit. The receiving unit is configured to receive a video signal source. Display panel Displays the image corresponding to the video source. The control unit is coupled to the receiving unit and the display panel, and the control unit executes the image processing module to detect the resolution provided by the video signal source, and performs sharpening on the video signal source according to the resolution provided by the video signal source. And displaying an image corresponding to the sharpened video signal source through the display panel.

Based on the above, in the image processing method and the display device, the display device can perform sharpening processing on the video signal source according to different resolution levels of the video signal source, so as to automatically adjust the displayed image to have the most appropriate display effect. . In this way, the display device can increase the sharpness of the image and provide better image quality for the user.

The above described features and advantages of the invention will be apparent from the following description.

100‧‧‧ display device

110‧‧‧ receiving unit

120‧‧‧ display panel

130‧‧‧Image Processing Module

140‧‧‧Control unit

308-1~308-5‧‧‧first order sharpening to fifth order sharpening

412‧‧‧Detection module

414‧‧‧Judgement module

416‧‧‧ Zoom Module

418‧‧‧sharp module

S202~S208, S302~S310, S502~S516‧‧‧ steps of image processing method

1 is a block diagram of a display device in accordance with an embodiment of the present invention.

2 is a flow chart of a method of an image processing method according to an embodiment of the invention.

3 is a flow chart of a method of performing a sharpening process on a video signal source in accordance with an embodiment of the invention.

4 is a block diagram of an image processing module in accordance with an embodiment of the present invention.

FIG. 5 is a flowchart of a method of an image processing method according to an embodiment of the invention.

6A is a resolution scaled portion of a video signal source according to an embodiment of the invention. Images that have been processed but not sharpened.

FIG. 6B is an image of a video signal source after resolution scaling processing and sharpening processing according to an embodiment of the invention.

When the image resolution of the video signal source received by the ultra-high-resolution display device is low, if the resolution is scaled internally, the sharpness, brightness, or contrast of the image can be enhanced. Outputting the video signal source to the display panel of the ultra-high-resolution display device is displayed, which is bound to increase the display effect. The present invention is an image processing method and display device proposed based on the above viewpoint. In order to make the content of the present invention clearer, the following specific embodiments are examples of the invention that can be implemented.

1 is a block diagram of a display device in accordance with an embodiment of the present invention. Referring to FIG. 1, the display device 100 is, for example, an ultra-high resolution display, but is not limited thereto. The display device 100 includes a receiving unit 110, a display panel 120, an image processing module 130, and a control unit 140. The control unit 140 executes the image processing module 130 to implement multiple steps of the image processing method.

The receiving unit 110 is, for example, a video input port (Video Input Port) for receiving a video signal source input from the outside. In addition, the resolution provided by the video signal source is, for example, 720×480 pixels, 1280×720 pixels, 1920×1080 pixels, 3840×2160 pixels, or 4096×2160 pixels, but is not limited thereto.

The display panel 120 is, for example, an ultra high resolution display panel, and the display panel The type of the 120 is, for example, a liquid crystal display panel, an electrophoretic display panel, or an organic light emitting display panel, but is not limited thereto.

The image processing module 130 is configured to detect the resolution provided by the video signal source, and perform image processing such as sharpness enhancement processing on the video signal source. The image processing module 130 is implemented, for example, as a hardware circuit composed of one or several logic gates. Alternatively, the image processing module 130 can also be implemented by computer code. For example, the image processing module 130 can be implemented by an application or a driver or the like by a code segment written in a programming language, and the code segments are stored in the storage unit and executed by the control unit 140. The storage unit is, for example, a non-volatile memory, a random access memory (RAM), or a hard disk, but is not limited thereto.

The control unit 140 is coupled to the receiving unit 110, the display panel 120, and the image processing module 130, and controls the overall operation of the explicit device 100. Specifically, the control unit 140 performs image processing according to the resolution provided by the video signal source through the image processing module 130, and displays the processed video signal source on the display panel 120. Further, the control unit 140 is, for example, a central processing unit (CPU) or a microprocessor (Microprocessor), but is not limited thereto.

The steps of the image processing method will be described in detail below with the above-described display device 100. 2 is a flow chart of a method of an image processing method according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2 simultaneously, in step S202, the receiving unit 110 receives the video signal source. In step S204, the control unit 140 executes the image processing module 130 to detect the resolution provided by the video signal source. For example, the image processing module 130 The resolution information of the video signal source can be read, or the resolution provided by the video signal source can be determined according to the pixel clock of the video signal source (ie, the number of pixels to be displayed per second).

In step S206, the image processing module 130 performs an sharpening process on the video signal source according to the resolution provided by the video signal source. Specifically, for a video signal source that provides a higher resolution (eg, a resolution greater than 3840×2160 pixels), the image processing module 130 performs a lower degree (eg, below a preset level) on the video signal source. Sharpening. For a video signal source that provides a lower resolution (for example, the resolution is less than 3840×2160 pixels), the image processing module 130 performs a resolution scaling process on the video signal source, and after amplifying the resolution of the video signal source. Sharpening the video signal source to a higher degree (for example, above a preset level). Of course, the image processing module 130 can also perform other image processing to enhance the display effect.

3 is a flow chart of a method of performing a sharpening process on a video signal source in accordance with an embodiment of the invention. Referring to FIG. 1 and FIG. 3 simultaneously, before the image processing module 130 performs the sharpening process on the video signal source, as shown in step 302, the image processing module 130 performs noise reduction processing on the video signal source. And as shown in step 304, the image processing module 130 performs deinterlace processing on the video signal source. Then, in step S306, the image processing module 130 performs segmentation processing on the image corresponding to the video signal source to divide the image into a plurality of blocks, that is, the image processing module 130 in the subsequent step The blocks respectively perform sharpening processing. In step S308, the image processing module 130 determines the degree of sharpness based on the resolution provided by the video source. For convenience of explanation, the degree of sharpening here is, for example, divided into first-order sharpening 308-1 to fifth-order sharpening 308-5, but is not limited to these orders. In other embodiments, the degree of sharpening may be Differentiate into more orders. Further, the first-order sharpening 308-1 is, for example, a sharpening process corresponding to the lowest degree, and the fifth-order sharpening 308-5 is, for example, a sharpening process corresponding to the highest degree, that is, the fifth-order sharpening 308. The image after -5 will be more clear than the image after the fifth step sharpening 308-5. In other words, when the resolution provided by the video signal source is small, the image processing module 130 selects higher order sharpening to perform. Conversely, when the resolution provided by the video signal source is larger, the image processing module 130 selects lower order sharpening to perform. Finally, in step S310, the image processing module 130 performs sharpening on the block of the image according to the selected degree of sharpening, thereby completing the image sharpening of the video signal source.

Returning to FIG. 2, in step S208, the control unit 140 displays the image of the sharpened video signal source through the display panel 120. Since the image of the video signal source is sharpened, the edges and details of the object in the display image can be enhanced, so that the image displayed by the display panel 120 has better definition.

In order to further explain the above-described image processing method, an embodiment will be described below in conjunction with the above display device 100.

4 is a block diagram of an image processing module in accordance with an embodiment of the present invention. Referring to FIG. 4 , the image processing module 130 can include a detection module 412 , a determination module 414 , a zoom module 416 , and a sharpening module 418 . The detection module 412 is configured to detect the resolution provided by the video signal source, and the determination module 414 is configured to use the detection module. The resolution detected by 412 determines whether the resolution provided by the video signal source is less than a preset resolution, so that the zoom module 416 and/or the sharpening module 418 perform its function. The zoom module 416 is configured to perform a resolution scaling process on a video signal source with a small resolution. The sharpening module 418 is configured to perform sharpening on the video signal source.

It is noted that the sharpening module 418 can perform sharpening processing according to a lookup table, wherein the lookup table is stored, for example, in a storage unit (not shown) and records the resolution and required information provided by the video signal source. The degree of sharpening. Therefore, the sharpening module 418 can find the sharpness required for the resolution according to the lookup table, and then sharpen the image provided by the video signal source according to the degree of sharpening.

FIG. 5 is a flowchart of a method of an image processing method according to an embodiment of the invention. Referring to FIG. 1 , FIG. 4 and FIG. 5 simultaneously, in step S502, the receiving unit 110 receives the video signal source. In step S504, the detection module 412 detects the resolution provided by the video signal source. In this embodiment, as shown in step S506, the determining module 414 determines whether the resolution provided by the video signal source is less than a preset resolution, wherein the preset resolution is, for example, 3840×2160 pixels or other 4K resolution. Of course, the user can set the size of the preset resolution according to the resolution of the display panel 120.

If the resolution provided by the video signal source is less than the preset resolution, the zoom module 416 performs a resolution scaling process on the video signal source as shown in step S508. Here, the zoom module 416 amplifies the resolution provided by the video signal source, for example, to a resolution that conforms to the preset resolution. Then, in step S510, the sharpening module 418 performs the first class on the video signal source after the resolution scaling process. Sharpening.

Further, the sharpening module 418 can obtain the resolution provided before the video signal source is not scaled according to the lookup table (that is, the resolution of the video signal source when the receiving unit 110 receives the video signal source). The degree of sharpening. Specifically, Table 1 is a lookup table in accordance with an embodiment of the present invention, wherein the lookup table records different resolutions, pixel clocks, and the degree of sharpening required to be increased (ie, the first order is sharpened to the fifth order). Sharpening), and the preset resolution is, for example, 3840x2160@30Hz. In addition, the first-order sharpening to the fifth-order sharpening corresponds to the degree of sharpening of "strong", "medium", "medium-low", "weak" and "micro" respectively. Here, the sharpening processing performed by the degree of sharpening corresponding to the preset resolution is the first type of sharpening processing, and the sharpening processing performed by the degree of sharpening corresponding to the preset resolution is not smaller. , belongs to the second category of sharpening.

When the sharpening module 418 performs the first type of sharpening processing, please refer to Table 1, and assume that the resolution of the video signal source when the receiving unit 110 receives the video signal source. For 720x480@60Hz, the sharpening module 418 will process the image corresponding to the video signal source with the fifth-order sharpening. Alternatively, if the resolution of the video signal source when the receiving unit 110 receives the video signal source is 1280×720@60 Hz, the sharpening module 418 will process the image corresponding to the video signal source with the fourth-order sharpening. Alternatively, if the resolution of the video signal source when the receiving unit 110 receives the video signal source is 1920×1080@60 Hz, the sharpening module 418 will process the image corresponding to the video signal source with the third-order sharpening.

It is worth mentioning that when the resolution provided by the video signal source is between the first resolution and the second resolution, wherein the first resolution is smaller than the second resolution, the sharpening module 418 compares The degree of sharpening corresponding to the large second resolution performs sharpening on the video signal source. For example, when the resolution of the video signal source detected by the detection module 412 is between 720x480@60Hz and 1280x720@60Hz, the sharpening module 418 will have a larger resolution (ie, 1280x720@ 60Hz) corresponds to the degree of sharpening (ie, the fourth-order sharpening) to perform sharpening on the video signal source. For example, when the resolution of the video signal source detected by the detection module 412 is between 1280x720@60Hz and 1920x1080@60Hz, the sharpening module 418 will have a larger resolution (ie, 1920x1080@60Hz). The corresponding degree of sharpening (ie, the third-order sharpening) is performed to perform sharpening on the video signal source.

FIG. 6A is an image after the video signal source is subjected to resolution scaling processing, but is not sharpened, according to an embodiment of the invention. FIG. 6B is an image of a video signal source after resolution scaling processing and sharpening processing according to an embodiment of the invention. Comparing FIG. 6A with FIG. 6B, it can be seen that the image of the video signal source that has been sharpened (ie, FIG. 6B) is more clear than the image that has not been sharpened (ie, FIG. 6A).

It should be noted that after the sharpening module 418 performs sharpening on the video signal source, the image processing module 130 can also enhance the color saturation, brightness, or contrast of the image to coordinate the color of the image.

Finally, returning to FIG. 5 , the control unit 140 selects the image processed by the image processing module 130 on the display panel 120 . In this way, for the video signal source that provides lower resolution (ie, less than the preset resolution), the image processing module 130 automatically enhances the video signal source in addition to performing the resolution scaling process on the video signal source. Sharpness, to avoid blurring after the image is scaled by resolution, and to achieve a display effect that more closely matches the user's needs.

On the other hand, if the resolution provided by the video signal source is not less than the preset resolution, then as shown in step S514, the sharpening module 418 performs a second type of sharpening processing on the video signal source, wherein the second The degree of sharpening of the class sharpening process is less than the sharpness of the first type of sharpening process described above. Here, since the resolution provided by the video signal source is close to 4K resolution, the image processing module 130 can selectively save the zoom module 416 from performing the resolution scaling process.

Further, in order to increase the display effect, the sharpening module 418 can obtain the sharpening degree required for the resolution of the video signal source according to the lookup table 420, thereby performing the second type of sharpening processing. For example, as shown in Table 1 above, if the resolution of the video signal source when the receiving unit 110 receives the video signal source is 3840×2160@30 Hz, the sharpening module 418 will process the second-order sharpening. The image corresponding to the source of the frequency signal. Alternatively, if the resolution of the video signal source when the receiving unit 110 receives the video signal source is 3840×2160@60 Hz, the sharpening module 418 will process the image corresponding to the video signal source with the first-order sharpening. In addition, when the resolution of the video signal source detected by the detection module 412 is between 3840x2160@30Hz and 3840x2160@60Hz, similarly, the sharpening module 418 will also have a larger resolution (ie, 3840x2160). @60Hz) corresponds to the degree of sharpening (ie, the first-order sharpening) to perform sharpening on the video signal source. In addition, the image processing module 130 can also enhance the color saturation, brightness, contrast, and the like of the image. Then, in step S516, the control unit 140 displays the video signal source processed by the image processing module 130 through the display panel 120. In other words, for the video signal source whose resolution meets the preset resolution, the image processing module 130 also fine-tunes the sharpness of the image of the video signal source, thereby improving the display effect.

In summary, the image processing method and the display device of the present invention can dynamically enhance image sharpness according to different resolutions of the video signal source. When the display device receives the video signal source with a lower resolution, the image signal source is automatically sharpened after the resolution scaling process is performed, and then the video signal source is output to the display panel for display, thereby enhancing the sharpness of the image. And avoid blurry images. In addition, for a video signal source that meets ultra-high resolution, the display device can also perform sharpening processing to make the image clearer. In this way, different types of video signal source input formats can have the best display effect on the ultra-high resolution display device, so as to better meet the needs of users.

Although the present invention has been disclosed above by way of example, it is not intended to limit the present invention. The scope of the present invention is defined by the scope of the appended claims, which are defined by the scope of the appended claims, without departing from the spirit and scope of the invention. quasi.

S202~S208‧‧‧Steps of image processing method

Claims (12)

An image processing method is applicable to a display device having a display panel, comprising: receiving a video signal source; detecting a resolution provided by the video signal source; and according to the resolution provided by the video signal source, Performing an sharpening process on the video signal source; and displaying the image corresponding to the sharpened video signal source on the display panel. The image processing method of claim 1, wherein the step of detecting the resolution provided by the video signal source comprises: determining a source of the video signal according to a pixel clock of the video signal source. The resolution provided. The image processing method of claim 1, wherein before the step of performing the sharpening process on the video signal source, the method further comprises: performing a resolution scaling process on the video signal source. The image processing method of claim 1, wherein the step of performing the sharpening process on the video signal source according to the resolution provided by the video signal source comprises: transmitting the video through a lookup table The degree of sharpening required by the signal source to perform the sharpening process, wherein the lookup table records the resolution provided by the video signal source and the degree of sharpening. The image processing method of claim 4, wherein the step of performing the sharpening process on the video signal source according to the resolution provided by the video signal source further comprises: determining the video signal source Whether the resolution provided is less than a preset resolution; if the resolution is less than the preset resolution, performing a first type of sharpening processing on the video signal source; and if the resolution is not less than the preset resolution And performing a second type of sharpening processing on the video signal source, wherein the degree of sharpening of the second type of sharpening processing is less than the degree of sharpening of the first type of sharpening processing. The image processing method of claim 4, wherein the step of performing the sharpening process on the video signal source according to the resolution provided by the video signal source further comprises: when the video signal source When the resolution is between a first resolution and a second resolution, wherein the first resolution is smaller than the second resolution, the degree of sharpening corresponding to the second resolution is This sharpening process is performed on the video signal source. A display device includes: a receiving unit for receiving a video signal source; a display panel for displaying an image corresponding to the video signal source; and a control unit coupled to the receiving unit and the display panel, The control unit executes an image processing module to detect a resolution provided by the video signal source. And performing an sharpening process on the video signal source according to the resolution provided by the video signal source, and displaying the image corresponding to the sharpened video signal source through the display panel. The display device of claim 7, wherein the image processing module determines the resolution provided by the video signal source according to a pixel clock of the video signal source. The display device of claim 7, wherein the image processing module performs a resolution scaling process on the video signal source before the image processing module performs the sharpening process on the video signal source. The display device of claim 7, wherein the image processing module performs a sharpening degree required for the sharpening process on the video signal source through a lookup table, wherein the lookup table records the video signal The resolution provided by the source and the degree of sharpening. The display device of claim 10, wherein the image processing module determines whether the resolution provided by the video signal source is less than a predetermined resolution, and if the resolution is less than the preset resolution, The image processing module performs a first type of sharpening processing on the video signal source, and if the resolution is not less than the preset resolution, the image processing module performs a second type of sharpening on the video signal source. Processing, wherein the degree of sharpening of the second type of sharpening processing is less than the degree of sharpening of the first type of sharpening processing. The display device of claim 10, wherein the resolution provided by the video signal source is between a first resolution and a second resolution When the first resolution is less than the second resolution, the image processing module performs the sharpening process on the video signal source according to the degree of sharpening corresponding to the second resolution.