KR19990017791A - Image transformation method of digital still camera - Google Patents

Abstract

The present invention relates to an image transformation method of a digital still camera that is capable of restoring and arbitrarily transforming an image stored in a memory once photographed. If less than a predetermined magnification, the second area including the first area is enlarged at an appropriate ratio to obtain an image having an original picture size or another desired size.

Description

Image transformation method of digital still camera

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital still camera, which is a digital still camera, which is capable of restoring image data already taken and input to zoom in / zoom out. It relates to an image transformation method.

In general, an electronic still camera is a general term for a next-generation still camera which converts an image signal for a still image into an electric signal and performs all processing such as processing, recording, and reproduction. It is a kind of digital still camera.

The digital still camera can instantly check the captured image. Once captured, the image information is recorded as a digital signal, which enables editing and modification, and post processing or remote transmission from a computer. As one of the expectations and attention gathered. When still images are processed digitally and stored in memory, JPEG (Joint Photographic Coding Experts Group) technology, an international standard for high resolution color still image compression technology, is applied. The size is compressed and stored in memory.

In general, the process of taking a predetermined object in the case of a silver salt camera as follows.

Conventional silver salt cameras or digital still cameras have a subject in the lens first to take a certain object, and when the shutter is pressed, the zoom automatically moves to the position of the person caught in the lens. There is a function that can be taken after being properly adjusted. Therefore, when taking a picture, you can manually adjust the zoom to take into account the size of the person before pressing the shutter, or select the function that automatically adjusts the zoom centered on the person in focus.

However, when the person who looked at the pictures already taken came out smaller than I expected, or when there was something I wanted to correct, I could not take appropriate measures.

As described above, such a conventional camera has a problem in that it cannot be performed in the case of a photo already taken when a user wants to zoom in / zoom out only a specific area of the photo later.

Accordingly, an object of the present invention is to provide an image transformation method of a digital still camera which stores an image photographed once in a memory and reads and arbitrarily transforms an image to be modified from the stored images.

1 is a block diagram showing the structure of a general digital still camera;

2A and 2B are exemplary views for explaining a process of enlarging an image in the image transformation method of the present invention;

3 is a flowchart illustrating a process of the image transformation method of the present invention.

<Explanation of symbols for main parts of drawing>

10: lens unit 20: photoelectric conversion unit

30: all signal processing section 40: main signal processing section

50: memory 70: display

80: key input unit

In order to achieve the object of the present invention, the present invention provides a method for image transformation using a digital still camera, comprising: selecting an image to be deformed among a plurality of previously photographed images; Setting a first area to be enlarged in the selected image; Determining whether the size of the first region is greater than or equal to a predetermined ratio with respect to the total size of the image; Removing a part of the second area except the first area from the image when the size of the first area is less than the predetermined ratio compared to the total size of the image; And enlarging the third area and the first area remaining after the part is removed from the second area to be equal to the total size of the image, and as a result of the enlargement, the size of the first area is the total size of the image. Compared to the removal and the enlargement step is repeated until the predetermined ratio or more.

Preferably, the predetermined ratio is characterized in that 60 to 70%.

Preferably, in the determining step, digital integration is performed on the entire data of the image and the data of the first area to perform comparison.

Preferably, in the removing step, the outer edge of the second region is removed by a predetermined length in the horizontal or vertical direction.

Hereinafter, the operation of the digital still camera used in the present invention will be described.

1 is a block diagram illustrating a general digital still camera.

As shown in FIG. 1, the digital still camera used in the present invention includes a lens unit 10 including a main lens for focusing incident light and a shutter for controlling the focused incident light; A photoelectric conversion unit 20 having a CCD (Charge Coupled Device) for photoelectric conversion of a two-dimensional optical image from the lens unit 10 into a one-dimensional electric signal and a CCD driving circuit unit for driving the CCD; An electric signal received from the photoelectric conversion unit 20, a pre-signal processing unit 30 including color separation, black and white level setting, and a gray level conversion circuit; A / D converter (Analog Digital converter) 41 which performs analog-to-digital conversion for converting the analog signal processed by the pre-signal processing unit 30 into digital and still images of the international standard organization (ISO). A main signal processor 40 comprising a digital signal processor 42 for compressing / extending data in a JPEG (Joint Photographic Coding Experts Group) method as a compression standard; A memory 50 for recording and reproducing image data of an image processed by the main signal processor 40; The key input unit 80 for key input for loading data into the memory 50 or designating a special effect mode such as image editing, and the input received from the key input unit 80 are analyzed and the main signal processing unit 40 and memory A microprocessor 60 for overall processing on image data to 50; And a display unit 70 for displaying the output of the A / D conversion unit 41 so that a user can check the display device such as a liquid crystal device (LCD).

The memory 50 includes a DRAM for storing temporary data generated in the process of processing image data input through a lens and a flash RAM for storing image data in which a still image of a predetermined subject is compressed in a JPEG method. .

The operation of the digital still camera configured as described above will be described in more detail with reference to the accompanying drawings.

First, when a user takes a picture with a digital still camera on a subject that is a specific object, the image of the subject is converted into image data, which is digital data, and corresponding data is continuously stored at a predetermined address of the memory 50 in order. do. The stored image data is converted into one and one still images in the memory 50 by the main signal processor 40 according to the Joint Photographic Coding Experts Group (JPEG) which is a compression standard of still images. Stored in RAM.

In this way, the still image stored once in the memory 50 can be reproduced at any time if the user desires, so that one of the still images stored in the memory 50 can be selected while viewing the screen of the display unit 70.

Hereinafter, the operation of the image transformation method of the present invention in the digital still camera operating as described above will be described with reference to the accompanying drawings.

2A and 2B are exemplary views for explaining a process of enlarging an image in the image transformation method of the present invention.

3 is a flowchart illustrating a process of the image transformation method of the present invention.

Usually, after taking a picture with a digital still camera, there are many cases in which the desired size of the picture does not come up, such as the person in the picture or the specific subject is too small.

As shown in FIG. 2A, first, a user checks a plurality of images already taken through the display unit 70, and then selects a predetermined image to be dual-modified (step S10).

Thereafter, the first area to be enlarged in the selected image is selected by manipulating a predetermined key and up, down, left, and right keys provided in the key input unit 80, so that the first area is selected by the microprocessor 60 and the main signal processor 40. ) Can be recognized (step S20).

When the first area selected in the image is a person, it is common to make the size of the area occupied by the person 60 to 70% of the total size of the picture. Therefore, it is necessary to compare the size of the first area to be enlarged with a predetermined size of the picture having a standard size.

Therefore, it is determined whether the size of the area occupied by the person to be enlarged is about 60-70% of the entire size of the picture (step S30). This determination process is performed by calculating the digital integral value calculated from the data of the entire image and the digital integral value calculated from the data of the first region as a percentage since the image is composed of digital data.

As a result of the comparison judgment in step S30, if the ratio is smaller than the total size of the photo, for example, less than 70%, it is not yet a photo having a desired size. Accordingly, the display unit 70 uses a predetermined key of the key input unit 80. While viewing, the unnecessary portion is removed from the outer edge of the second area excluding the first area by a predetermined length in the horizontal or vertical direction (step S40).

Thereafter, the remaining area from which the unnecessary edge is removed, that is, the third area and the first area which are partially removed from the second area are enlarged by a predetermined ratio so as to be equal to the entire picture size (step S50).

Thereafter, in the enlarged image at a predetermined ratio, the comparison step S30 is repeated to again compare the first enlarged and deformed picture total size with the size of the first area so that the size of the first area, that is, the area occupied by the person is equal to the size of the picture. Check that it is 60-70%.

On the other hand, if the comparison result of step S30 is greater than a certain ratio, i.e., 70% of the total size of the photo, it is no longer necessary to modify the overall size of the photo, and finally outputs the finished photo (step S50).

As described above, when it is determined that the previously photographed predetermined image has not been taken as originally intended by the photographer, an area of the predetermined image occupied by the person to be enlarged is enlarged at a predetermined ratio to have an original photo size or another desired size. You can get an image.

Since the present invention has been described through the above-described preferred examples, in view of the technical difficulty aspects of the present invention, a person having ordinary skill in the art may easily add other variations to another embodiment of the present invention. It is apparent that all other embodiments and other modifications citing the spirit of one description and the drawings are all belonging to the claims of the present invention.

As described in detail above, in the present invention, when the area size occupied by a person to be enlarged in a previously taken image is smaller than a predetermined ratio compared to the entire picture size, the present invention enlarges the person area at an appropriate ratio and enlarges the original picture size Alternatively, there is an advantage of obtaining an image having a different size desired.

Claims (4)

An image transformation method using a digital still camera, the method comprising: selecting an image to be modified from a plurality of previously photographed images; Setting a first area to be enlarged in the selected image; Determining whether the size of the first area is equal to or greater than the predetermined ratio relative to the total size of the image; If the size of the first area is less than or equal to a predetermined ratio relative to the total size of the image, removing a portion of the second area except the first area from the image; And enlarging the third area and the first area remaining after the part is removed from the second area to be equal to the total size of the image, and as a result of the enlargement, the size of the first area is the total size of the image. The image transformation method of the digital still camera, characterized in that for repeating the removal and the enlargement step until the predetermined ratio or more. The method of claim 1, wherein the predetermined ratio is 60 to 70%. The image transformation method of claim 1, wherein in the determining step, digital integration is performed on all data of the image and data of the first region. The method of claim 1, wherein in the removing step, the outer edge of the second area is removed by a predetermined length in a horizontal or vertical direction.