TWI407429B - Image zooming device and image zooming method - Google Patents

Abstract

An image zooming method adjusting an image in a monitor displaying area includes the steps of setting at least one focus region of the image in the monitor displaying area; obtaining a focus center in accordance with the focus region; setting a zooming rate of the image; obtaining a shift vector in accordance with a display center of the monitor displaying area, the focus center and the zooming rate; and shifting the image in the monitor displaying area in accordance with the shift vector, and setting the image size in the monitor displaying area in accordance with the zooming rate.

Description

Image zooming device and image zooming method

The present invention relates to a zooming device and a zooming method, and more particularly to an image zooming device and an image zooming method.

With the advancement of digital technology, information is easy to carry, and people can easily use digital products to create digital information, view digital information or modify digital information.

For example, the function commonly used by the user is to view the image. After the electronic product opens the image file, the image is displayed on the screen display area for the user to browse. The user can zoom in and out according to his or her preference. However, during the zooming process, the image is usually zoomed at the center of the image, or the center of the screen display area is used as the origin. Scale the image.

Referring to FIG. 1A, when an image is opened on a display 1, for example, all images are displayed in the screen display area 11, and the theme in the image is small and located on the right side of the screen display area. When the user wants to enlarge the image to view the theme, the image is enlarged with the image center as the origin, as shown in FIG. 1B. At this time, the theme in the image is not in the center of the screen display area 11, and part of the image theme has been The screen display area 11 is exceeded, and the user must move the theme to the screen display area 11 by dragging the image.

As described above, after zooming in on an image, the user often needs to drag and drop to view or view the theme in the image. This will cause the user to need complicated dragging action to view or view the theme in the image, which is quite inconvenient.

Therefore, how to provide an image zooming device and an image zooming method to enable a user to easily view or view a theme in an image after zooming the image is one of the current important topics.

In view of the above problems, an object of the present invention is to provide an image that can be automatically focused to display a theme in an image in a screen display area when the image is zoomed in the screen display area, so as to reduce the user's need to drag and drop the display screen multiple times. Image zooming device and image zooming method.

To achieve the above object, the present invention provides an image zooming method for adjusting an image in a screen display area. The image zooming method comprises the steps of: setting at least one focus area on the image in the screen display area; obtaining a focus center according to the focus area; setting a zoom ratio of the image; obtaining a center according to the center of the screen display area, the focus center, and the zoom ratio Moving the vector; and moving the image in the screen display area according to the motion vector, and setting the image size of the image in the screen display area according to the zoom ratio.

To achieve the above object, the present invention provides an image zooming device and an image matching application displayed on a screen display area. The image zooming device comprises a focus area setting module, a focus center calculation module, an enlargement ratio setting module, a motion vector calculation module and an execution module. The focus area setting module sets at least one focus area on the image in the screen display area. The focus center computing module obtains a focus center based on the focus area. The magnification ratio setting module sets the zoom ratio of the image. The motion vector calculation module obtains a motion vector according to the center position, the focus center and the zoom ratio of the display area of the screen. The execution module moves the image in the screen display area according to the motion vector, and sets the image size of the image in the screen display area according to the zoom ratio.

In a preferred embodiment of the invention, the focus area is set via an object recognition technique. The object identification technology can be face recognition technology, or mobile object recognition technology, or building identification technology, or natural landscape recognition technology.

As described above, the image zooming device and the image zooming method according to the present invention use an object recognition technology (such as face recognition technology, mobile object recognition technology, or building identification technology, or natural landscape recognition technology) to set an image. Focusing area, and according to the focus center, and after calculating the motion vector, moving the focus center to the center position of the screen display area, so that the user can automatically display the theme in the image after zooming the image. In the screen display area. In this way, the user can reduce the number of times the image is dragged, and the subject in the image can be easily browsed or viewed.

An image zooming apparatus and an image zooming method according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, in which the same elements will be described with the same reference numerals.

Referring to FIG. 2, the image scaling method according to the preferred embodiment of the present invention includes steps S01 to S05. The image zooming method adjusts an image in a screen display area.

Step S01 is to set at least one focus area on the image in the screen display area. The focus area may represent a subject in the image, which may be one or plural. In this embodiment, the focus area is obtained and set by an object recognition technology. Of course, the focus area may also be any area selected by the user and is not limited thereto. The object identification technology is, for example, face recognition technology, or animal identification technology, or building identification technology, or natural landscape recognition technology. However, if there are different themes in the image, such as having both people and buildings, the identification technique can be customized by the user.

Step S02 obtains a focus center according to the focus area. In the present embodiment, when the image has only one focus area, the focus center will be preset as the center position of the focus area. If the image has a plurality of focus regions, the focus center is based on the focus regions and a point on the image is obtained according to a calculation program, for example, the center of the circumscribed rectangle of the focus regions, or The center of gravity of the focus area. The weight calculated by the center of gravity is the area of the effective focus area, and the effective focus area refers to the focus area displayed in the display area of the screen.

Step S03 sets a zoom ratio of one of the images. In this embodiment, the zoom ratio may be a preset value or may be set by the user.

Step S04 obtains a motion vector according to one of the display center, the focus center, and the zoom ratio of the display area of the screen. In this embodiment, the motion vector represents a parameter value of a direction in which the focus center of the image moves in the screen display area and a moving distance. It should be noted that, in addition to the fact that the display center is the center of the screen, in another embodiment, the display center may be changed to any position set by the user in the screen display area. In addition, it is worth mentioning that the meaning represented by the display center can be the image position displayed by the display center. In other words, the image position displayed by the display center before the image zoom is the other image position after zooming. Furthermore, the motion vector has a preset zoom-panning-rate, which is described later.

Step S05 moves the position of the image in the screen display area according to the motion vector, and sets the image size of the image in the screen display area according to the zoom ratio. In this embodiment, the image is moved according to the movement vector to a set point direction of the screen display area, wherein the set point is, for example, a user-customized position or a center position of the screen display area.

In the following, two examples will be used to further illustrate the image zooming method of the preferred embodiment of the present invention, and an enlarged image will be taken as an example. First, please refer to FIG. 3, FIG. 4A, FIG. 4B, and FIG. 4C to explain the first example. FIG. 3 is a flowchart of execution of one of the image scaling methods.

As shown in FIG. 4A, first, step S11 is to open the image in the screen display area 11 of the display 1, and the entire image is displayed in the screen display area 11, and the image size at this time is, for example, 25%.

Step S12 sets a focus area FR ₀₁ in the screen display area 11. Step S13 calculates the focus center FC ₀₁ based on the focus area FR _01. In the present embodiment, since it is a single focus area, the focus center FC ₀₁ is the center position of the focus area FR ₀₁ .

Step S14 pre-sets the motion vector. The direction of the preset motion vector is from FC ₀₁ to SC ₀₁ , and the motion vector length is delta/50, where delta is the distance from FC ₀₁ to SC ₀₁ . The zoom ratio setting module sets the zoom ratio, and determines the actual motion vector based on the zoom ratio and the preset motion vector.

In this embodiment, the scaling-displacement parameter of the motion vector is as follows:

(delta/50) × (zoom ratio difference), where delta is the distance from the display center SC ₀₁ to the focus center FC ₀₁ , and the zoom ratio difference is the difference between the zoom ratio before and after the image is scaled. In the present embodiment, for example, the image is enlarged from 25% to 50%, and the zoom-displacement parameter is (delta/50)×(50-25)=delta/2.

Step S15 performs a zooming movement, which moves the position of the image in the screen display area 11 according to the motion vector, and sets the image size of the image in the screen display area 11 according to the zoom ratio. As shown in FIG. 4B, since the zoom-displacement parameter is delta/2, the display center SC ₀₂ at this time is at the midpoint of the line connecting the original display center SC ₀₁ and the focus center FC ₀₂ , and since it is enlarged by 25%. Up to 50%, the focus area FR ₀₁ in the screen display area 11 is set to be twice as large as the focus area FR ₀₂ , and the original focus center FC ₀₁ is also relatively changed to FC ₀₂ .

Then, in step S16, it is judged whether or not the zooming is ended. When the result is "YES", the program ends. When the result is "NO", the process proceeds to step S17.

Step S17 updates the focus area, which resets the focus area FR ₀₂ . In this embodiment, a single focus area is taken as an example, and thus the position of the focus area and the focus center in the image is always unchanged. However, since the zoom ratio of the image in the screen display area changes, the position of the focus center in the screen display area changes after zooming.

Next, in step S18, it is determined whether the focus area is modified. When the result is YES, step S13 is performed to calculate the focus center FC ₀₂ , and when the result is "NO", step 14 is performed.

Step 14 resets the motion vector. The direction of the motion vector is from FC ₀₂ to SC ₀₂ , the length of the motion vector is delta/50, and delta is the distance between the current display center and the focus center, that is, the distance between SC ₀₂ and FC ₀₂ .

Here, for example, the image will continue to be enlarged to 100%, then the zoom-displacement parameter is (delta/50)×(100-50)=delta, so after performing the zooming movement, the focus center FC _{03 of the} focus area will be The display center SC ₀₃ overlaps as shown in FIG. 4C.

Referring to FIG. 5A to FIG. 5D below, a second example will be described. This embodiment is described by taking a plurality of focus areas as an example.

As shown in FIG. 5A, the image is first turned on in the screen display area 11, and the entire image is displayed in the screen display area 11, and the image size at this time is, for example, 25%.

Next, the focus areas FR ₁₁ , FR ₁₂ , FR ₁₃ , FR ₁₄ , FR _{15 are set} , and the focus center FC _{11 is} calculated in accordance with the focus areas FR ₁₁ , FR ₁₂ , FR ₁₃ , FR ₁₄ , FR ₁₅ . In this embodiment, the face recognition technology is used as an example to illustrate that the focus area is a human face in the image. The face recognition technology has been scattered in many public documents, for example, according to Adaboost operation, Haar wavelet feature (feature) and OpenCV face detection software designed by related identification technology. The detection software has Haar wavelet features and face classifiers that are effective for face face, eyes, nose and mouth, which have been trained for a large number of face image samples. (ie, a classifier for judging a face or not belonging to a human face), the face, eyes, nose, and mouth in the digital image can be detected and quickly recognized.

Re-set the motion vector. The direction of the motion vector is from FC ₁₁ to SC ₁₁ . The length of the motion vector can be adjusted according to the actual application, where the length of the motion vector is preset to be (delta/50), where delta is the distance from FC ₁₁ to SC ₁₁ .

The zoom module sets the magnification (for example, to 50%), then the scale-displacement parameter of the actual motion vector required for this zoom is (delta/50)×(50-25)=delta/2, so move and zoom After the image, as shown in FIG. 5B, the display center SC ₁₂ of the screen display area 11 is located at the midpoint of the line connecting the original display center SC ₁₁ and the focus center FC ₁₁ .

Since the image after the movement and zooming has been changed, the focus areas FR ₂₁ , FR ₂₂ , FR ₂₃ , FR _{24 are} re-updated, and some areas of FR ₂₁ and FR ₂₂ fall outside the screen, so only the part inside the screen The area is valid. The original FR ₁₅ falls entirely outside the screen so the entire FR ₁₅ is invalid and there is no longer FR ₂₅ . The new focus center FC _{12 is} recalculated according to the new focus areas FR ₂₁ , FR ₂₂ , FR ₂₃ , FR ₂₄ .

Next, reset the motion vector. The direction of the motion vector is from FC ₁₂ to SC ₁₂ . The length of the motion vector is delta/50, and delta is the distance between FC ₁₂ and SC ₁₂ .

Then, continue to set the magnification (for example, to 66%) and decide to move the vector. The scaling-displacement parameter of the motion vector is (delta/50)×(66-50)=delta/3 (in this case, an integer is taken as an example). Therefore, after moving and zooming the image, as shown in FIG. 5C, the display center SC ₁₃ of the screen display area 11 is located at one third of the line connecting the original display center SC ₁₂ and the focus center FC ₁₂ . The focus area is renewed and a new focus center FC _{13 is} calculated based on the new focus areas FR ₃₃ , FR ₃₄ .

Reset the motion vector. The direction of the motion vector is from FC ₁₃ to SC ₁₃ . The length of the motion vector is delta/34, and delta is the distance between FC ₁₃ and SC ₁₃ .

When the magnification is continuously set (for example, to 100%), the actual motion vector is calculated as (delta/34) × (100 - 66) = delta. 5D, when the image is magnified to 100%, the display center SC ₁₄ and the focus center FC ₁₄ overlap.

Referring to FIG. 6, the image zooming device 2 of the preferred embodiment of the present invention is coupled to an image displayed in a screen display area. The image zooming device 2 includes a focus area setting module 21, a focus center calculation module 22, an enlargement ratio setting module 23, a motion vector calculation module 24, and an execution module 25. The focus area setting module 21 sets at least one focus area for the image in the image. The focus center calculation module 22 obtains a focus center based on the focus area. The enlargement ratio setting module 23 sets the zoom ratio of the image. The motion vector calculation module 24 obtains a motion vector according to the center position, the focus center, and the zoom ratio of the display area of the screen. The execution module 25 moves the image in the screen display area according to the motion vector, and sets the image size of the image in the screen display area according to the zoom ratio. The related description has been described in the above embodiments, and thus will not be described herein.

When calculating the focus center and the displacement vector, the following rules are followed:

a, when there is only one focus area, regardless of whether or not the focus area is outside the screen, the focus center is always the center of the focus area.

b, each focus area has a center, and the screen should accommodate as many of the center of the focus area as possible.

c. At least one center of the focus area should fall on the screen at any time.

In summary, the image zooming device and the image zooming method according to the present invention use object recognition technology (such as face recognition technology, mobile object recognition technology, or building identification technology, or natural landscape recognition technology) to set the screen display. The focus area in the area, and the focus center is obtained, and after the motion vector is calculated, the focus center is moved to the center position of the screen display area, so that the user can automatically zoom the subject in the image after zooming the image. Presented in the screen display area. In this way, the user can reduce the number of times the image is dragged, and the subject in the image can be easily browsed or viewed.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . monitor

11. . . Screen display area

2. . . Image zooming device

twenty one. . . Focus area setting module

twenty two. . . Focus center computing module

twenty three. . . Magnification ratio setting module

twenty four. . . Mobile vector computing module

25. . . Execution module

FR ₀₁ , FR ₀₂ , FR ₁₁ ~ FR ₁₅ , FR ₂₁ ~ FR ₂₄ , FR ₃₃ ~ FR ₃₄ . . . Focus area

FC ₀₁ , FC ₀₂ , FC ₀₃ , FC ₁₁ , FC ₁₂ , FC ₁₃ , FC ₁₄ . . . Focus center

SC ₀₁ , SC ₀₂ , SC ₀₃ , SC ₁₁ , SC ₁₂ , SC ₁₃ , SC ₁₄ . . . Display center

S01~S05, S11~S18. . . Steps for image scaling

1A and 1B are schematic diagrams showing a conventional image zooming action;

2 is a flow chart of an image zooming method according to a preferred embodiment of the present invention;

3 is a flow chart showing a method for image zooming according to a preferred embodiment of the present invention;

4A-4C are schematic diagrams showing an image zooming action of a single focus area according to a preferred embodiment of the present invention;

5A-5D are schematic diagrams showing image zooming operations of a plurality of focus regions according to a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of an image zooming device according to a preferred embodiment of the present invention.

S01~S05. . . Steps for image scaling

Claims (8)

An image zooming method is to adjust an image in a screen display area, the image zooming method includes the steps of: setting at least one focus area on the image in the screen display area; obtaining a focus center according to the focus area; setting the image The zoom ratio of the image; according to one of the display areas of the screen display center, the focus center and the zoom ratio, and a motion vector; and moving the image in the screen display area according to the motion vector, and according to the zoom ratio The image size of the image in the display area of the screen is set, wherein the focus area is obtained and set by an object recognition technology, and the focus area represents a theme. The image zooming method according to claim 1, wherein the object recognition technology is a face recognition technology, or an animal identification technology, or a mobile object recognition technology, or a building identification technology, or a natural landscape recognition technology. The image zooming method of claim 1, wherein the image is moved according to the moving vector to a set point direction of the screen display area. The image zooming method of claim 3, wherein the set point is a center position of the screen display area or any position set according to an application requirement. The image zooming method of claim 1, wherein the image scaling method The focus center is the center of the focus area. The image zooming method of claim 1, wherein when the image is set to have a plurality of focus areas, the focus center is obtained according to the focus areas. The image zooming method of claim 6, wherein the focus center is a position of a center of gravity of the focus areas. An image zooming device is matched with an image displayed on a screen display area, the image zooming device includes: a focus area setting module, and at least one focus area is set for the image, the focus area setting module is An object recognition technology sets the focus area, and the focus area represents a theme; a focus center calculation module obtains a focus center according to the focus area in the screen display area; an enlargement ratio setting module sets the image a zoom ratio; a motion vector calculation module, according to a display center of the screen display area, the focus center and the zoom ratio, and a motion vector; and an execution module, the image is moved according to the motion vector on the screen display The position in the area, and the image size of the image in the screen display area is set according to the zoom ratio.