Abstract:
A photographic apparatus and method are disclosed in which a preview of an acquired image and at least one image quality variable image are displayed in a multiview image. The image quality variable image is an image wherein the acquired image is coded, compressed and decoded according to at least one plurality of quantizing coefficients, and is displayed as part of the multiview image according to the user&#39;s selection of image quality. Upon the user&#39;s selection of image quality, the corresponding image quality variable is stored in memory thereby enabling a user to select image quality in real time before storing an image.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of the Korean Patent Application No. 10-2005-0095721, filed on Oct. 11, 2005, which is hereby incorporated by reference as if fully set forth herein. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an image photographing apparatus and method, and more particularly, to an image photographing apparatus and method which provides a multiview image by which the quality of an image compressed can be checked in real time when a subject is photographed to produce a still or moving image. 
     2. Description of the Background Art 
     A mobile communication terminal (“terminal”) providing multimedia service to which a variety of functions are added has evolved from a mobile communication technology providing voice only communications. 
     Recently, the Internet, broadcasting and an image mail service have been provided for use with terminals. Supplementary features such as an MP3 player and a camera are often provided with the terminal for playing music and photographing an image. 
     In general, the camera is fixedly positioned at an upper center on one side of the terminal, and an image acquired by the camera is displayed on an LCD screen of the terminal. When still or moving images are acquired by the terminal, a user is generally unaware of the quality of the images as they are compressed and stored by just previewing the images on the terminal&#39;s display screen. 
     Also, since the users can only check the compressed and stored images one by one, user convenience is diminished. 
     SUMMARY OF THE INVENTION 
     Therefore, an object of the present invention is to provide an apparatus and method which maximizes user convenience by providing a multiview image by which the quality of an image can be checked in real time prior to the image being compressed when a subject is photographed to produce a still or moving image. 
     To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, an image photographing apparatus is provided comprising: a camera acquiring an image; and an image processing unit processing the acquired image into an image quality variable image; and a display unit displaying the processed image quality variable image. 
     To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, an image photographing method is provided comprising acquiring an image by photographing a subject; creating a preview image by the image signal processing of the acquired image; creating an image quality variable image by quantizing the acquired image; displaying the preview image and the image quality variable image in a multiview image; and storing the image according to an image quality selected by a user. 
     The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a unit of this specification, and illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings: 
         FIG. 1  is a block diagram illustrating a mobile communication terminal having a camera therein in accordance with one embodiment of the present invention; 
         FIG. 2  is an operational flowchart of an image photographing method in a mobile communication terminal having a camera therein in accordance with embodiment of the present invention; 
         FIG. 3  is an exemplary view showing a typical single image as a preview image on a screen in  FIG. 1 ; 
         FIG. 4  is an exemplary view showing a multiview image on a screen in accordance with one embodiment of the present invention in  FIG. 1 ; and 
         FIG. 5  is an exemplary view showing a multiview image on the screen in accordance with another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the one embodiment of the present invention, examples of which are illustrated in the accompanying drawings. 
     A mobile communication terminal having a camera is described in one embodiment of the present invention. When a video or an image is acquired, the terminal displays the image quality of the video or the picture according to compression ratio prior to storing the video or image. Accordingly, selection can be made of one of a plurality of images by displaying the plurality of images according to the compression ratios. 
     To provide a selection of real-time image qualities, the terminal has a multiview image function. 
     As shown in  FIG. 1 , one embodiment of the present invention includes: a camera  100  acquiring an image of a subject; an image processing unit  200 ; a control unit  400 ; a display unit  300 ; a storage unit  500 ; a radio processing unit  600 ; a voice processing unit  700 ; a key input unit  800 ; and a temporary storage unit  900 . 
     The image processing unit  200  processes an image acquired by the camera  100  into a preview image and an image quality variable image. The image processing unit  200  separates the processed preview image from the image quality variable image and processes both images to provide a multiview image. 
     The image processing unit  200  includes a preview image processing unit  210 , an image quality variable image processing unit  220 , and an image dividing unit  230 . 
     The preview image processing unit  210  processes the image acquired by the camera  100  and reduces the size of the processed image to provide a preview image, and further includes an image processing unit  211  and a first image reducing unit  212 . 
     The image processing unit  211  processes the image acquired by the camera  100 . The first image reducing unit  212  reduces the size of the image processed in the image processing unit  211  to a predetermined size. 
     The image quality variable image processing unit  220  varies image quality of the image acquired by the camera  100  and reduces the acquired image of which image quality has been varied to provide at least one image quality variable image. 
     The image quality variable image processing unit  220  includes an image quality varying unit  221  and a second image reducing unit  222 . 
     The image quality varying unit  221  codes and compresses the acquired image by a predetermined quantizing coefficient and decodes the compressed image to provide an image quality variable image. 
     The second image reducing unit  222  reduces the image quality variable image by a predetermined size. In addition, the second image reducing unit  222 , when a plurality of image quality variable images are provided, reduces the image quality variable images to be of equal size for displaying on a portion of the display screen. 
     The image dividing unit  230  processes the preview image and the image quality variable images into a single multiview image for display on the display unit  300 . 
     The control unit  400  controls image processing and image size of the preview image, selects a quantizing coefficient, codes and compresses the image by the selected quantizing coefficient, and controls the size of the compressed image quality variable image. 
     In addition, the control unit  400 , according to a user&#39;s selection, selects one or more quantizing coefficients and compresses an image by the selected one or more quantizing coefficients to thereby vary the image quality according to the selected quantizing coefficient. 
     In addition, the control unit  400  temporarily stores the acquired image and each compression image which is coded and compressed by one or more quantizing coefficients, and stores the image compressed according to compression ratio selected by the user. 
     In addition, the control unit  400  displays the remaining memory according to storage of the compression image selected by the user, and also displays a level bar to adjust image quality of the image by stages. 
     The storage unit  500 , according to the present invention, stores a table of quantizing coefficients corresponding to image compression ratios. 
     The temporary storage unit  900 , temporarily stores the acquired image and the images coded and compressed by one or more quantizing coefficients. 
     In addition, the control unit  400  performs the overall control of the terminal. The storage unit  500  stores applications programs operating the features of the terminal and additional supplementary information such as telephone numbers and text message. 
     The key input unit  800  receives user&#39;s commands, and more particularly, commands a multiview image mode selection and a compression image selection. 
     The voice processing unit  700  processes a voice signal by radio for radio communication. The radio processing unit  600  transmits the voice signal processed in the voice processing unit  700  to a receiving side. 
     The operation and effect in accordance with the embodiment of the present invention will be described in accordance with an operational flowchart of  FIG. 2 . 
     The storage unit  500  stores a table of quantizing coefficients corresponding to image compression ratios in which the higher value a quantizing coefficient has, the more the compression ratio increases and accordingly, the more the image quality of the image is deteriorated. 
     First, the camera  100  photographs a subject and acquires an image (SP 1 ). 
     The control unit  400  determines whether or not a multiview image mode is selected (SP 2 ). If the multiview image mode is not selected, the control unit  400  processes the image acquired by the camera  100  (SP 3 ) and displays a single image on the display unit  300  as a preview image as shown in  FIG. 3  (SP 4 ). 
     When the multiview image mode is selected (SP 2 ), the control unit  400 , performs a preview image processing procedure (SP 5 , SP 6  and SP 7 ) and an image quality variable image processing procedure (SP 5 , SP 8  to SP  10 ) to display a multiview image. 
     The preview image processing procedure and the image quality variable image processing procedure will be described below. First, the preview image processing procedure will be described. The image acquired by the camera  100  is processed (SP 6 ) and the size of the processed image is reduced by half with respect to the screen to produce a preview image (SP 7 ). 
     The image quality variable image processing procedure is described as follows: First, according to a user&#39;s command provided by the key input unit  800 , the control unit  400  selects one or more quantizing coefficients which have been previously stored in the storage unit  500  (SP 8 ). 
     Next, the image quality varying unit  221  codes the acquired image by the one or more quantizing coefficients and compresses each coded image, and then decodes each of the compressed images to produce one or more image quality variable images (SP 9 ). The control unit  400  stores the one or more compression images in the temporary storage unit  900 . Then, the second image reducing unit  222  reduces the one or more image quality variable image signals provided by the image quality varying unit  221 . 
     When one image quality variable image is provided by the image quality varying unit  221 , the second image reducing unit  222  reduces the image quality variable image in half and provides the reduced image quality variable image (SP 10 ). 
     In addition, when a plurality of image quality variable image signals are inputted from the image quality varying unit  221 , the second image reducing unit  222 , reduces the plurality of image quality variable image signals to be of equal size for display on a screen divided in half, and provides the plurality of image quality variable images having been reduced to equal size. 
     The image processing unit  200  compresses the preview image and the image quality variable image on one screen (SP 11 ), and displays a multiview image as shown in  FIG. 4  on the display unit  300  (SP 12 ). 
     Also, the image processing unit  200  displays the preview image and the plurality of image quality variable images on one screen as a multiview image as shown in  FIG. 5  on the display unit  300 . 
     A level bar  401  as shown in  FIG. 4  is displayed on the multiview image to allow the user to adjust image quality of a compression image by stages. The remaining memory is displayed on the screen, according to storage of the compression image selected by the user. 
     Accordingly, the user adjusts image quality of the image quality variable image from the multiview image using the level bar  501  as shown in  FIG. 5  and checks the remaining memory depending upon storage of the compression image in advance of actually storing the compressed image. 
     If the available memory is sufficient, the selected (SP 13 ) image quality variable image is stored in the storage unit  500  (SP 14 ). 
     Accordingly, the control unit  400  moves the image quality variable image previously stored in the temporary storage unit  900  to the storage unit  500 . The image stored in the storage unit  500  is stored as a picture or a video according to a user&#39;s selection. 
     In the present invention when a subject is photographed to produce a still or moving image and displayed on the screen, a multiview image by which the quality of a compressed image can be checked in advance of storing the image. 
     As so far described, the present invention provides a multiview image through which image quality of a compressed image can be checked in order to maximize user convenience when a subject is photographed to produce a still or moving image in the terminal having a camera. 
     As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.