TWI385593B - Display device and method for adjusting pictures - Google Patents

Description

Display device and method for adjusting picture

The present invention relates to a display device and method for adjusting a picture.

In general, since the display ratio of the picture is different from the ratio of the display screen, the picture cannot be displayed as a whole according to the display ratio of the picture during display, that is, the picture needs to be adjusted correspondingly, so that the adjusted picture can be displayed according to the display. The proportion of the curtain is displayed on the display screen as a whole.

In the prior art, there are generally two ways to adjust the picture. One is to compress the picture, and the display ratio of the picture is adjusted to be consistent with the ratio of the display screen to realize the overall display picture. However, this method will make the picture distorted and affect the picture. Another way to display the image is to cut the image. When the aspect ratio of the image is larger than the aspect ratio of the display, the width of the image is scaled to be equal to the width of the display, and then the image is cut. When the aspect ratio of the picture is smaller than the aspect ratio of the display screen, the length of the picture is scaled to be equal to the length of the display screen, and then the portion beyond the width of the picture is cut off, which ensures that the image is not Distortion, however, when there is a character in the displayed picture, it is possible to cut off the character part.

In view of the above, it is desirable to provide a display device and method for adjusting a picture. When the picture display ratio does not match the display screen ratio, the picture is cut according to the position of the face in the recognized person picture for the person picture.

In order to achieve the above object, the present invention provides a display device for adjusting a picture, the display device comprising a display unit, a reading module, and the reading The module is used to read the image to be displayed, and a comparison module is used to obtain the display ratio of a picture and the ratio of the display screen of the display unit, which is consistent with the ratio of the display ratio to the display screen; The group adjusts the picture when the display ratio of the picture is inconsistent with the display screen ratio, and includes: a picture recognition sub-module for identifying whether the picture to be displayed is a character picture; and a face recognition sub-module for identifying the picture of the person The position of the face and the number of faces; a center determining sub-module for determining the center position of the face in the character picture according to the recognized face position and the number of faces; a picture cutting sub-module When the aspect ratio of the character picture is larger than the aspect ratio of the display screen, the width of the enlarged/reduced person picture to the character picture is equal to the width of the display screen, and the distance from the center position of the face to the wide side of the close distance is greater than the length of the display screen. In the middle of the face, the center line of the face is centered, and the parallel line of the wide side of the character picture is made at the left and right sides of the display screen at the center of the face. The line cuts off the picture of the person beyond the display screen. The close-width wide side is the side closer to the left side of the face and the right wide side of the person's face; the distance from the center of the face to the wide side of the face When it is less than half of the length of the display screen, the distance to the wide side of the display is the parallel line of the wide side of the display screen length, and the picture of the person beyond the display screen is cut along the parallel line; the aspect ratio of the picture of the person When the aspect ratio of the screen is smaller than the aspect ratio of the display screen, the length of the zoomed/reduced character image to the character image is equal to the length of the display screen. When the distance from the center of the face to the long distance of the close distance is greater than half of the width of the display screen, the center position of the face is used. For the center, the parallel line of the long side of the character picture is made at half of the width of each of the upper and lower sides of the face at the center of the face, and a part of the character picture beyond the display screen is cut along the parallel line. For the center of the face to the top of the character picture The long side and the lower side of the long side are closer to each other; when the distance from the center of the face to the long side of the close distance is less than half of the width of the display screen, the distance to the long side of the close distance is the long side parallel line at the width of the display screen. , cutting off a part of the character picture beyond the display screen along the parallel line; a picture display module for displaying the cut picture of the person in the display unit as a whole.

The present invention also provides a method for adjusting a picture, comprising the steps of: reading a picture to be displayed; obtaining a display ratio of the picture and a display screen ratio of the display unit, and comparing the display ratio with the display screen ratio; When the aspect ratio is inconsistent with the aspect ratio of the display screen, the picture is adjusted; whether the picture is a person picture; and when the picture is a person picture, the position of the face in the picture of the person and the number of faces are recognized; The center position of the face in the character picture is determined according to the position of the face and the number of faces; when the aspect ratio of the person picture is larger than the aspect ratio of the display screen, the method includes: enlarging/reducing the width of the person picture to the width of the person picture is equal to The width of the display screen; whether the distance from the center position of the face to the wide side of the close distance is greater than half of the length of the display screen, the close wide side is the distance from the center of the face to the left wide side and the right wide side of the character picture. One side; when the distance from the center of the face to the wide side of the close is greater than half the length of the display, centering on the center of the face, in the distance from the face The left side of the heart position and the half of the length of each display screen are parallel lines of the wide side of the character picture, and the picture of the person beyond the display screen portion is cut along the parallel line; the distance between the wide side of the face at the center of the face is smaller than When half of the length of the screen is displayed, the distance to the wide side of the display is the parallel line of the wide side of the display screen length, and the picture of the person beyond the display screen portion is cut along the parallel line; the cut picture is displayed as a whole; The aspect ratio of the picture is smaller than the length of the display screen The width ratio includes: enlarging/reducing the length of the person picture to the length of the character picture is equal to the length of the display screen; whether the distance from the center position of the face to the long side of the close distance is greater than half of the width of the display screen, the long distance of the short distance is a person The center of the face is located closer to the long side of the figure and the longer side of the lower side; when the distance from the center of the face to the long side of the close is greater than half of the width of the display, the center of the face is centered at the distance At the upper and lower sides of the face center position, the parallel line of the long side of the character picture is made at half of the width of the display screen, and the part of the character beyond the display screen is cut along the parallel line; at the center of the face to the long side of the close distance When the distance is less than half of the width of the display screen, the distance to the long side of the close distance is the long side parallel line at the width of the display screen, and the part of the character beyond the display screen is cut along the parallel line; the overall displayed character is cut. image.

Compared with the prior art, the present invention can adjust the character picture according to the recognized face position for the person picture when the display ratio of the picture is inconsistent with the ratio of the display screen, and try to prevent the character in the character picture from being cut. Drop it.

As shown in FIG. 1, it is a hardware structure diagram of a display device for adjusting a picture. The display device includes an interface 100, a storage unit 200, a processing unit 300, and a display unit 400. The interface 100 is used to connect an external storage device (not shown), such as a digital camera, a USB flash drive, a mobile hard disk, a camera phone, and the like, which can store pictures. The interface 100 can be a USB interface, a 1394 interface, or the like. The storage unit 200 is for storing pictures in the display device. The display unit 400 is for displaying a picture.

The processing unit 300 includes a reading module 310, a comparison module 320, a picture adjustment module 330, and a picture display module 340. The reading module 310 is configured to read a picture to be displayed from the storage unit 100 or an external storage device. The comparison module 320 is configured to obtain a display ratio of the to-be-displayed image and a display screen ratio of the display unit, and compare the display ratio of the image with the display screen ratio of the display unit 400, and determine whether the display device can display the overall The picture is displayed if the display ratio of the picture matches the display screen ratio of the display unit 400. If not, the picture adjustment module 330 adjusts the picture and displays it.

The picture adjustment module 330 includes a picture recognition sub-module 332, a face recognition sub-module 333, a center determination sub-module 334, and a picture-cut sub-module 335. The picture recognition sub-module 332 is configured to identify whether the picture to be displayed contains a character, and if a picture contains a character, it is a character picture. The face recognition sub-module 333 is configured to identify the position of the face in the person's picture and the number of faces. In the present embodiment, when detecting the position of a face, a face detection technique based on the Adaboost algorithm is preferentially used, but other face detection methods may be used. The center determining sub-module 334 is configured to determine the center position of the face according to the location of the face recognized in the picture and the number of faces. Here, when the number of faces is one, the center position of the face is determined according to the contour of the recognized face; when the number of faces is plural, the center position of each face is first determined, The center position of each face is connected. When the number of faces is two, the center point of the connection line is taken as the center position of the face. When the number of faces is three or more, the solution is obtained. The center point of the area formed by each connecting line serves as the center position of the face.

The picture cutout sub-module 334 is configured to cut the picture according to the determined face center position, so that the face part is not cut off as much as possible when the picture is cut.

Figure 2a is a schematic view of a display screen having a length a and a width b.

2b and 2c are schematic views of the picture when the aspect ratio of the picture is larger than the aspect ratio of the display screen. First, the picture cutout sub-module 335 enlarges/reduces the picture to be wider than the width of the display screen. Since the aspect ratio of the picture is larger than the aspect ratio of the display screen, the length of the picture is longer than the length of the display screen, that is, You need to cut the horizontal picture. The center position of the face recognized by the face recognition sub-module 333 is point E, and the distance from the point E to the left and right sides of the left side (hereinafter referred to as a short distance side) is c, if c>a/2, then As shown in FIG. 2b, the picture cutout sub-module 334 is centered on the E point, and is a parallel line of the wide side of the picture at a/2 degrees from the left and right sides thereof, as indicated by the dotted line in the figure, along the dotted line. Cut off the part of the picture beyond the display screen; if c<a/2, as shown in Fig. 2c, the picture cutting sub-module 334 makes a parallel line from the short side to a distance from the short side, such as As indicated by the dotted line in the figure, the image is cut along the dotted line beyond the portion of the display.

2d and 2e are schematic views of the picture when the aspect ratio of the picture is smaller than the aspect ratio of the display screen. First, the picture cutting sub-module 334 enlarges/reduces the picture to the length of the picture equal to the length of the display screen. Since the aspect ratio of the picture is smaller than the aspect ratio of the display screen, the width of the picture is larger than the width of the display screen, that is, The vertical picture needs to be cut. The center position of the face recognized by the face recognition sub-module 333 is point E, and the distance from the point E to the upper and lower sides of the upper side (hereinafter referred to as a short distance side) is d, if d>b/2, then As shown in Figure 2d, the picture is cut The module 334 is centered on the E point, and is a parallel line of the long side of the picture at the upper and lower b/2 points, as shown by the dotted line in the figure, and the part of the picture is cut along the dotted line beyond the display screen; d<b/2, as shown in FIG. 2e, the picture-cutting sub-module 334 cuts the parallel line of the long side with the distance to the short-distance side as b, as shown by the dotted line in the figure, and cuts along the dotted line. The picture is beyond the portion of the display.

In another embodiment, the picture adjustment module 330 further includes a form recognition sub-module 331 for using the length and width of the picture (long parallel to the horizontal direction, perpendicular to the horizontal direction) Width) determines its display form. Two display forms are defined here: when the length of the picture is larger than the width of the picture, the picture is called a horizontal picture, and when the length of the picture is smaller than the width of the picture, it is called a straight picture. Here, when the picture is a straight picture, the center position of the face recognized by the center determining sub-module 334 is moved downward by a predetermined distance, and then the picture is cut.

The cut picture can be displayed by the picture display module 340.

As shown in FIG. 3, it is a flowchart of a method for adjusting a picture. First, the reading module 310 reads a picture to be displayed from the storage unit 100 or an external storage device (step S10).

The comparison module 320 acquires the display ratio of a picture and the display screen ratio of the display unit (step S20).

The comparison module 320 compares the display ratio of the acquired image with the display screen ratio of the display unit (step S30).

If the results of the comparison match, the picture display module 340 displays the picture as a whole through the display unit 400 (step S40).

If the results of the comparison are inconsistent, the picture adjustment module 330 displays the picture after adjustment, and the adjustment process includes the following steps: the picture recognition sub-module 332 identifies whether the picture to be displayed is a person picture (step S50).

If the picture is not a person picture, it is generally processed (step S60).

If the picture is a person picture, the face recognition sub-module 333 identifies the position of the face in the person picture and the number of faces (step S70).

The center determination sub-module 334 determines the center position of the face in the person picture based on the recognized face position and the number of faces (step S80).

The picture cutout sub-module 335 cuts the person picture according to the recognized face center position, and the specific cutting process can refer to the description of FIGS. 3a-3d (step S90).

The picture display module 340 displays the cut picture of the person on the display unit as a whole (step S100).

In another implementation manner of the present invention, the method further includes the following steps: when the form recognition sub-module 331 identifies that the picture is a straight picture, the center determining module 334 moves the determined face center position by a predetermined distance, and then the picture The position of the cutting sub-module 335 after the movement is cut as the center position of the face to cut the straight picture.

Interface ‧‧100

Storage unit ‧‧200

Processing unit ‧ ‧ 300

Reading module ‧‧ ‧310

Comparison module ‧ ‧ 320

Picture Adjustment Module ‧‧330

Form recognition sub-module ‧‧331

Picture recognition sub-module ‧‧ 332

Face recognition sub-module ‧‧ 333

Center to determine the sub-module ‧ ‧ 334

Picture cutting submodule ‧ ‧ 335

Picture display module ‧ ‧ 340

Display unit ‧‧400

Read the picture to be displayed ‧‧‧S10

Get the aspect ratio of the image and the screen ratio of the display unit ‧‧‧S20

Compare the display ratio to the screen ratio. ‧‧‧S30

Direct display ‧‧‧S40

Identify if the picture is a character picture ‧‧‧S50

General treatment ‧‧‧S60

Identify the position of the face in the person's picture and the number of faces ‧‧‧S70

Determine the center position of the face based on the position of the face and the number of faces ‧‧S80

Adjust the picture of the person and cut it. ‧‧S90

The overall picture of the person after the cut is displayed.‧‧S100

FIG. 1 is a diagram showing a hardware structure of a display device for adjusting a picture.

2a-2e are schematic diagrams showing the process of cutting a person's picture in an embodiment.

Figure 3 is a flow chart of a method of adjusting a person picture.

Read the picture to be displayed ‧‧‧S10

Get the aspect ratio of the image and the screen ratio of the display unit ‧‧‧S20

Compare the display ratio to the screen ratio. ‧‧‧S30

Direct display ‧‧‧S40

Identify if the picture is a character picture ‧‧‧S50

General treatment ‧‧‧S60

Identify the position of the face in the person's picture and the number of faces ‧‧‧S70

Determine the center position of the face based on the position of the face and the number of faces ‧‧S80

Adjust the picture of the person and cut it. ‧‧S90

The overall picture of the person after the cut is displayed.‧‧S100

Claims (6)

A display device for adjusting a picture, the display device comprising a display unit, a reading module, the reading module for reading a picture to be displayed, wherein the display device further comprises: a comparison The module is configured to obtain a display ratio of a picture and a display screen ratio of the display unit, which is consistent with the display ratio and the display screen ratio; and a picture adjustment module, when the display ratio of the picture is inconsistent with the display screen ratio, The image is adjusted, including: a picture recognition sub-module, which is used to identify whether the picture to be displayed contains a character, and if a picture contains a character, it is a character picture; a face recognition sub-module is used to identify the position of the face in the picture of the person The number of faces; a center determining sub-module for determining the center position of the face in the character picture according to the recognized face position and the number of faces; a picture cutting sub-module, in the picture of the character When the aspect ratio is larger than the aspect ratio of the display screen, the width of the zoomed/reduced character image to the character image is equal to the width of the display screen, and the center position of the face to the wide side of the close distance When the distance is greater than half of the length of the display screen, center the position of the face, and make the parallel lines of the wide sides of the figure of the characters on the left and right sides of the display screen at the distance from the center of the face, and cut along the parallel lines. Cut off the picture of the person beyond the display screen. The short side of the face is the side closer to the left side of the face and the right side of the picture. The distance between the center of the face and the wide side is smaller than the display screen. At half the length, the width to the wide side of the display is wide at the length of the display screen. Parallel lines, cut off the picture of the person beyond the display screen along the parallel line; when the aspect ratio of the character picture is smaller than the aspect ratio of the display screen, the length of the enlarged/reduced person picture to the character picture is equal to the length of the display screen, When the distance from the center of the face to the long side of the close distance is greater than half of the width of the display screen, the length of the character image is made at the center of the face and at half the width of each of the upper and lower sides of the face. Parallel lines on the sides, cut off part of the picture of the person beyond the display screen along the parallel line, the long side of the close distance is the side of the face from the center of the person's face to the long side of the figure and the distance from the long side of the figure; in the center of the face When the distance from the position to the long side of the close distance is less than half of the width of the display screen, the distance to the long side of the close distance is a long parallel line at the width of the display screen, and a part of the character picture beyond the display screen is cut along the parallel line; A picture display module is configured to display the cut picture of the person in the display unit as a whole. The display device for adjusting a picture according to the first aspect of the invention, wherein the picture adjustment module further comprises a form identification sub-module, wherein the form identification sub-module determines the display form of the picture according to the aspect ratio of the picture, When the picture is a straight picture, the center position of the face is moved downward by a preset distance, and then the picture is cut by the picture cutting sub-module. The display device for adjusting a picture according to claim 1, wherein: the center determining sub-module determines the center position of the face according to the recognized face contour when the number of faces is one; When the number of faces is plural, the center position of each face is first determined, and the center position of each face is connected. When the number of faces is two, the center point of the connection line is taken. As the center position of the face, when the number of faces is three or more, the center point of the area formed by each connection line is obtained as the face center position. A method for adjusting a picture, the method comprising the steps of: reading a picture to be displayed; obtaining a display ratio of the picture and a display screen ratio of the display unit, comparing the display ratio of the comparison picture with the ratio of the display screen; When the display ratio is inconsistent with the ratio of the display screen, the picture is adjusted. The adjustment process includes the following steps: identifying whether the picture contains a character, and if the picture contains a character, the picture of the person; identifying the position of the face in the picture of the person and the face of the person The number of the face is determined according to the position of the face and the number of faces; when the aspect ratio of the character image is larger than the aspect ratio of the display screen, the width of the person image to the width of the character image is enlarged/reduced It is equal to the width of the display screen; when the distance from the center position of the face to the wide side of the close distance is greater than half of the length of the display screen, the close wide side is the distance from the center of the face to the left wide side and the right wide side of the character picture. Near side; when the distance from the center of the face to the wide side of the close is greater than half the length of the display, the center of the face Set as the center, make the parallel line of the wide side of the character picture at half the length of the display screen on the left and right sides of the face center position, cut off the picture of the person beyond the display part along the parallel line; at the center of the face The distance from the wide side of the position is less than half the length of the display screen When the distance to the wide side of the close distance is the parallel line of the wide side of the display screen length, the picture of the person beyond the display screen portion is cut along the parallel line; the aspect ratio of the character picture is smaller than the length and width of the display screen. The ratio includes: enlarging/reducing the character picture to the length of the character picture is equal to the length of the display screen; comparing the distance from the center position of the face to the long side of the close distance is greater than half of the width of the display screen, the long distance of the close side is the face The center position is closer to the long side of the character picture and the longer side of the lower side; when the distance from the center of the face to the long side of the close distance is greater than half of the width of the display screen, the center of the face is centered at the distance from the face. At the upper and lower sides of the center position, the parallel line of the long side of the character picture is made at half the width of the display screen, and the part of the character beyond the display screen is cut along the parallel line; the distance from the center of the face to the long side of the close distance When the width is less than half of the width of the display screen, the distance to the long side of the display is the long side parallel line at the width of the display screen, and the part of the character beyond the display screen is cut along the parallel line; The body displays the picture of the person after the cut. A method for adjusting a picture according to claim 4, further comprising the steps of: determining a display form of the picture according to an aspect ratio of the picture, and when the picture is a straight figure picture, the face center position is used. After moving down a preset distance, the person's picture is cut. A method for adjusting a picture according to claim 4, wherein, in the step of determining a center position of a face in a person picture, when the number of faces is one, according to the recognized face The contour determines the center position of the face. When the number of faces is plural, the center of each face is first determined. Position, the center position of each face is connected. When the number of faces is two, the center point of the connection line is taken as the center position of the face, and when the number of faces is three or more, Then, the center point of the area formed by each connecting line is obtained as the center position of the face.