JP7161869B2 - VIDEO PROCESSING DEVICE AND DISPLAY MODE CHANGE METHOD - Google Patents

Description

The present invention relates to a video processing device and a display mode changing method.

2. Description of the Related Art Conventionally, for example, there is an in-vehicle display system that displays an image displayed on a main display installed in a vehicle on a sub-display installed in the rear of the vehicle. In such a display system, for example, there is a system that displays a menu for changing the display mode of the sub-display by OSD (On Screen Display) (see, for example, Patent Document 1).

JP 2009-69613 A

However, in the conventional technology, if an inexpensive microcomputer is used to control the sub-display, there is a risk that parts whose display mode is being changed may be displayed, resulting in deterioration of the visibility of the image.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a video processing apparatus and a method of changing a display mode that can prevent deterioration in the visibility of a video image due to a change in the display mode.

In order to solve the above-described problems and achieve the object, a video processing device according to an embodiment includes a calculation unit and an instruction unit. The calculation unit calculates a drawing period of a target part whose display mode is to be changed, among a plurality of parts sequentially displayed in one frame. The instruction unit instructs to change the display mode of the target part by avoiding the rendering period calculated by the calculation unit.

Advantageous Effects of Invention According to the present invention, it is possible to prevent deterioration in the visibility of an image due to a change in display mode.

FIG. 1 is a diagram showing an outline of a display mode changing method. FIG. 2 is a diagram illustrating a configuration example of a display system. FIG. 3 is a block diagram of the video processing device. FIG. 4 is a diagram showing an example of a display image. FIG. 5 is a diagram showing a configuration example of an adjusted image. FIG. 6 is a diagram showing a specific example of change timing. FIG. 7 is a schematic diagram showing a period during which one frame is rendered. FIG. 8 is a flow chart showing a processing procedure executed by the video processing device.

Hereinafter, a video processing device and a display mode changing method according to embodiments will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

First, the overview of the display mode changing method according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a display mode changing method. This display mode changing method is executed by the video processing device 1, which will be described later with reference to FIG.

A display mode changing method according to an embodiment displays an image by using a progressive method or an interlace method in which scanning lines of one frame of an image are sequentially displayed.

By the way, conventionally, some display systems that change the display mode using a progressive or interlaced display method have a backup register. In such a display system, the image display mode is changed on the register, and then the image whose display mode has been changed is displayed.

However, in the prior art, the manufacturing cost increases by the amount of the use of the backup register. On the other hand, when the display mode is changed without the backup register, an image may be displayed while the display mode is being changed, resulting in deterioration of the visibility of the image.

Therefore, in the display mode changing method according to the embodiment, the display mode is changed so as not to display the image in the process of changing the display mode without using a backup register.

That is, in the display mode changing method according to the embodiment, the display mode of the target part is changed while avoiding the drawing period in which the target part whose display mode is to be changed is drawn within one frame.

Specifically, as shown in FIG. 1, in the display mode changing method according to the embodiment, first, the drawing period dp is calculated (step S1). Here, the rendering period dp is a period during which the target part whose modification mode is to be changed is rendered on the display device. In the example shown in FIG. 1, the drawing area in which the target part is drawn is indicated by hatching. A specific example of the target parts will be described later.

Subsequently, in the display mode changing method according to the embodiment, an instruction is given to change the display mode so that the display mode of the target part is changed while avoiding the calculated drawing period dp (step S2).

That is, in the display mode changing method according to the embodiment, the display mode of the target part is changed during the non-drawing periods np1 and np2 other than the rendering period dp. In other words, the display mode of the target part is changed during a period other than the rendering period dp during which the target part is displayed.

This makes it possible to display the target part whose display mode has been completely changed. Therefore, according to the display mode changing method according to the embodiment, it is possible to prevent the visibility of the image from being deteriorated due to the change of the display mode without using a backup register.

Next, a configuration example of a display system including the video processing device 1 will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration example of a display system. Note that such a display system is, for example, a display system for a sub-display provided in a rear seat of a vehicle.

As shown in FIG. 2, the display system 100 according to the embodiment includes a video processing device 1, a video IC (Integrated Circuit) 50, a storage device 60, and a display device .

The video processing device 1 is a control device that controls the entire display system 100, and gives the video IC 50 instructions such as calculation of the drawing period dp and change of the display mode.

The video IC 50 outputs the video signal acquired from the storage device 60 to the display device 70 based on the control signal input from the video processing device 1 . Communication between the video processing device 1 and the video IC 50 is, for example, I2C (Inter Integrated Circuit) communication.

The storage device 60 is, for example, a NOR flash memory, and stores various image information. The video IC 50 extracts image information to be displayed on the display device 70 from the storage device 60 and sequentially outputs the image information to the display device 70 as video signals.

The display device 70 is, for example, TFT (Thin Film Transistor) liquid crystal or organic EL (Electro Luminescence) liquid crystal, and displays an image based on an image signal input from the image IC 50 .

Further, as shown in FIG. 2, the video IC 50 and the display device 70 are connected by a signal line L1 and a video line L2. The signal line L1 is a line for transmitting a vertical synchronizing signal vpp, which is a signal indicating division of one frame displayed on the display device 70 . Also, the video line L2 is a line for transmitting the video signal described above.

As shown in FIG. 2, the signal line L1 is connected to the video processing device 1 at one branched end. That is, in this embodiment, the vertical synchronization signal vpp is input from the video IC 50 to the video processing device 1 . As a result, the video processing device 1 can calculate the drawing period dp based on the vertical synchronization signal vpp. Although FIG. 2 shows the case where the branched signal line L1 is connected to the video processing device 1, the signal line L1 may be connected from the video IC 50 and to the display device 70 individually.

Next, a configuration example of the video processing device 1 according to the embodiment will be described with reference to FIG. FIG. 3 is a block diagram of the video processing device 1. As shown in FIG. As shown in FIG. 3 , the video processing device 1 includes a control section 2 and a storage section 3 .

The control unit 2 includes a calculator 21 and an instruction unit 22 . The control unit 2 includes, for example, a computer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), HDD (Hard Disk Drive), input/output ports, and various circuits.

The CPU of the computer functions as the calculation unit 21 and the instruction unit 22 of the control unit 2 by reading and executing programs stored in the ROM, for example.

Moreover, at least a part or all of the calculation unit 21 and the instruction unit 22 of the control unit 2 can be configured by hardware such as ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

Also, the storage unit 3 corresponds to, for example, a RAM or an HDD. The RAM and HDD store change period information 31 . Note that the video processing apparatus 1 may acquire the above-described programs and various types of information via another computer or portable recording medium connected via a wired or wireless network.

The calculation unit 21 of the control unit 2 calculates the drawing period dp of a target part whose display mode is to be changed among a plurality of parts sequentially displayed in one frame, and notifies the instruction unit 22 of information about the drawing period dp. do.

FIG. 4 is a diagram showing a specific example of a display image. As shown in FIG. 4, the display image di includes an adjusted image ci and a background image bi. The video IC 50 generates an adjusted image ci out of the display image di. The background image bi is, for example, an image displayed on a main display (not shown) and an image input from the main display.

As shown in FIG. 4, parts p1 to p3 for setting contrast, brightness, color tone, etc. are displayed in the adjustment image ci. The user can set the contrast, brightness, color tone, etc. by operating the parts p1 to p3 via an operation unit (not shown).

Specifically, the image processing device 1 instructs the image IC 50 to change the display mode of the parts p1 to p3 according to the user's operation. As a result, for example, the image IC 50 changes the display mode including the display position, color, size, etc. of the adjusted image ci including the parts p1 to p3.

FIG. 5 is a diagram showing a configuration example of an adjusted image ci. As shown in FIG. 5, the adjusted image ci is composed of a plurality of scanning lines. First, the calculation unit 21 calculates the number of scanning lines from the start scanning line (first scanning line) where drawing of one frame starts to the drawing scanning line (fifth scanning line) where drawing of the target part starts. A drawing timing at which the drawing period dp starts is calculated.

In the example shown in FIG. 5, the number of scanning lines up to the drawing scanning line is 5, and the target part is drawn from the fifth scanning line after the start of drawing of one frame. Also, the time ta required for writing one scanning line is a known value.

Therefore, the calculation unit 21 can calculate the drawing timing by calculating the number of scanning lines up to the drawing scanning line×time ta. Further, the calculation unit 21 calculates the length of the drawing period dp based on the number of scanning lines in which the target part is included in the drawing area. That is, the length of the drawing period dp is the number of scanning lines included in the drawing area×time ta.

Returning to the description of FIG. 3, the instruction unit 22 will be described. The instruction unit 22 instructs to change the display mode of the target part by avoiding the rendering period dp calculated by the calculation unit 21 .

Specifically, the instruction unit 22 determines the change timing at which the change of the display mode is started so that the change period cp during which the display mode of the target part is changed does not overlap with the drawing period dp.

Information related to the change period cp is pre-stored in the storage unit 3 as change period information 31 . The change period information 31 is information indicating the time required to change the display mode. For example, the time required to complete rendering of one frame is approximately 17 msec, and the change period cp is approximately 3 msec.

FIG. 6 is a diagram showing a specific example of change timing. As shown in FIG. 6, the instruction unit 22 can detect the start timing st at which drawing of one frame is started based on the vertical synchronization signal vpp.

In this way, the instruction unit 22 can accurately grasp the start timing st by acquiring the vertical synchronization signal vpp, and thus can accurately recognize the drawing period dp. In addition to the vertical synchronizing signal vpp, a horizontal synchronizing signal indicating the input timing of one scanning line may be acquired. In such a case, for example, it is possible to recognize the start timing st of one frame by counting the number of pulses of the horizontal synchronizing signal.

If the period from the start timing st to the start of the drawing period dp is longer than the change period cp, the instruction unit 22 immediately instructs to change the display mode during the period before the start of the drawing period dp. .

That is, if the display mode of the target part can be changed from the start timing st to the drawing period dp, the instruction unit 22 instructs the display mode to be changed by the drawing period dp. This makes it possible to quickly display the target part whose display mode has been changed.

On the other hand, if the period from the start timing st to the start of the drawing period dp is shorter than the change period cp, the instruction unit 22 instructs to change the display mode of the target part after the drawing period dp ends.

That is, if the change in the display mode of the target part is not in time from the start timing st to the drawing period dp, the instruction unit 22 waits until the drawing period dp ends before changing the display mode.

In such a case, for example, the instruction unit 22 may instruct the display mode to be changed at the timing when the drawing period dp ends, or alternatively, the display mode may not be changed until the next drawing period dp. Once completed, an instruction may be given to start changing the display mode at an arbitrary timing.

In this way, the instruction unit 22 determines the change timing so that the change period cp in which the display mode is changed does not overlap with the drawing period dp. As a result, the display mode of the target part is changed while avoiding the drawing period dp, and it is possible to prevent the target part whose display mode is being changed from being drawn.

Note that the instruction unit 22 may always instruct the image IC 50 to change the display mode of the target part immediately after the drawing period dp ends. That is, by changing the display mode promptly after the end of the drawing period dp, it is possible to complete the change of the display mode by the next drawing period dp. Even in such a case, it is possible to prevent the target part whose display mode is being changed from being constantly displayed.

Alternatively, the instruction unit 22 may divide the period during which one frame is rendered into a plurality of periods, and instruct the display mode to be changed during periods that do not overlap with the rendering period dp.

FIG. 7 is a schematic diagram showing a period during which one frame is rendered. As shown in FIG. 7, for example, the period required for drawing one frame is divided into a first half period t1 and a second half period t2.

Then, if the drawing period dp is included in the first half period t1, the instruction unit 22 gives an instruction to change the change mode in the second half period t2, and if the drawing period dp is included in the second half period t2, Instructs that the change mode is changed.

This makes it possible to set the change period cp for changing the display mode while avoiding the drawing period dp. Further, by dividing the period in advance, it becomes possible to easily determine the change period.

Although the case where the period during which one frame is drawn is divided into two periods, the first half period t1 and the second half period t2, has been described here, it may be divided into three or more periods. Also, here, the period in which one frame is drawn is from the start timing st to the next start timing st, but it may be the period from the start timing st to the end timing et.

Next, a processing procedure executed by the video processing device 1 according to the embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing a processing procedure executed by the video processing device 1. As shown in FIG.

As shown in FIG. 8, the control unit 2 of the video processing device 1 determines whether or not an instruction to change the display mode has been acquired (step S101). , a drawing period dp during which the target part is drawn is calculated (step S102).

Subsequently, the instruction unit 22 sets a display mode change period so that the display mode of the target part is changed while avoiding the drawing period dp (step S103). Subsequently, the instruction unit 22 instructs to change the display mode so that the display mode of the target part is changed during the change period (step S104), and ends the process.

On the other hand, when the control unit 2 does not acquire the change instruction (step S101, No), the process ends as it is.

As described above, the video processing device 1 according to the embodiment includes the calculator 21 and the instruction unit 22 . The calculation unit 21 calculates a drawing period dp during which a target part whose display mode is to be changed, among a plurality of parts sequentially displayed within one frame, is drawn.

The instruction unit 22 instructs to change the display mode of the target part by avoiding the rendering period dp calculated by the calculation unit 21 . Therefore, according to the image processing apparatus 1 according to the embodiment, since the target part whose display mode is being changed is not drawn, it is possible to prevent deterioration of the visibility of the image due to the change of the display mode.

By the way, in the above-described embodiment, the case where there is one target part has been described, but there may be a plurality of target parts at the same time. Further, in the above-described embodiment, the case where the display system 100 is a display system for a sub-display installed behind the vehicle has been described, but the display system 100 can also be applied to display systems such as smartphones and personal computers. It is possible.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments so shown and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

REFERENCE SIGNS LIST 1 video processing device 21 calculation unit 22 instruction unit 50 video IC
60 storage device 70 display device 100 display system dp drawing period vpp vertical synchronization signal

Claims (6)

a calculation unit for calculating a drawing period in which a target part whose display mode including at least one of display position, color, and size is to be changed among a plurality of parts sequentially displayed in one frame is drawn;
and an instruction unit that instructs to perform processing for changing the display mode of the target part while avoiding the rendering period calculated by the calculation unit. The instruction unit
A change timing for starting the process for changing the display mode is determined so that a change period in which the process for changing the display mode is actually performed does not overlap with the rendering period. 1. The video processing device according to 1. The instruction unit
If the period from the start of drawing of one frame to the start of the drawing period is longer than the change period , the processing for changing the display mode is performed within the period until the start of the drawing period. and if the period until the start of the drawing period is shorter than the change period, the process for changing the display mode is started after the drawing period ends. 3. The video processing device according to claim 2, wherein the instruction is given. The instruction unit
The period required for rendering one frame is divided into a plurality of periods, and an instruction is given so that the process for changing the display mode is performed during a period that does not overlap with the rendering period. The video processing device described. The instruction unit
The video processing device according to any one of claims 1 to 4, wherein timing at which drawing of said one frame is started is detected based on a vertical synchronization signal. a calculation step of calculating a drawing period in which a target part whose display mode including at least one of display position, color and size is to be changed among a plurality of parts sequentially displayed in one frame is drawn;
and an instruction step of instructing to perform processing for changing the display aspect of the target part while avoiding the rendering period calculated by the calculating step.

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