Display apparatus to detect letter-box boundary and method of displaying image using the same

A display apparatus comprising:

• a color space transformer to transform a color space of an input image into a color space representing a predetermined color of a letter-box area;
• a color detector to detect whether each pixel of each line of sequentially input frames of the input image is a pixel of the predetermined color;
• a counter to count a number of pixels of the predetermined color detected in the each line;
• a determiner to determine a maximum value of consecutive pixels of the predetermined color in each line;
• a letter-box detector to detect a boundary of the letter-box area in each frame of the input image using the number of pixels counted by the counter in each line and the maximum value of consecutive pixels determined by the determiner in each line;
• a boundary determiner to determine final boundaries the letter-box area of the input image by determining a line to be one of the final boundaries of the letter-box area if the letter-box detector detects the line as the boundary of the letter-box area a predetermined number of times or more in the frames of the input image;
• and
• an adjuster to adjust a size of the input image such that an image area within the final boundaries of the letter-box area is fit to a size of a screen.

A display apparatus to display sequentially input frames of an input image on a screen, comprising:

• a letter-box detecting unit to determine whether each line of pixels of each frame is in a letter-box area based on a color of each pixel and to determine lines of each frame as local letter-box boundaries defining the letter-box area of each frame according to the lines of pixels determined to be in the letter-box area;
• a boundary detecting unit to determine global letter-box boundaries of the letter-box area of the input image based on the local letter-box boundaries defining the letter-box areas of the frames of the input image;
• and
• an adjustment unit to define an image area of each frame according to the determined global letter-box boundaries of the input image and to resize the defined image area to be displayed on the screen.

A display apparatus to display an input image having an image area and a letter-box area on a screen, comprising:

• a computer graphics interface (CGI) detecting unit to detect a position of a CGI in a letter-box area of an input image;
• a letter-box detector to detect boundaries separating the letter-box area of the input image from the image area of the input image and to adjust the detected boundaries of the letter-box area according to the detected position of the CGI to include a portion of the letter-box area having the CGI in the image area;
• and
• an adjustment unit to adjust a size of the image area including the portion of the letter-box area having the CGI to fit on the screen.

A display apparatus to display sequentially input frames of an input image, comprising:

• a letter-box area detector to detect a letter-box area in each frame by detecting at least one of a number pixels in each line of each frame of a predetermined letter-box color and a number of consecutive pixels in each frame of the predetermined letter-box color;
• a computer graphics interface detecting unit to detect whether a computer graphics interface (CGI) exists in the detected letter-box area of each frame and to determine a position of the CGI in each frame;
• and
• a display unit to define a common image area for all of the frames of the input image based on the detected letter-box area in each frame and the determined position of the CGI in each frame and to display the common image area of each frame.

A method of displaying an image, comprising:

• detecting whether each pixel of each line of sequentially input frames of an input image is a black pixel of a letter-box area;
• counting a number of black pixels detected in each line;
• detecting a maximum value of consecutive black pixels in each line;
• detecting a boundary of the letter-box area in each frame using the number of black pixels counted and the maximum value detected in each line;
• determining final boundaries of the letter box-area by determining a line of the input image to be one of the boundaries of the letter-box area if the line is detected as a boundary of the letter-box area a predetermined number of times or more in the frames of the input image;
• and
• adjusting a size of the input image such that an image area within the finals boundaries of the letter-box area is fit to a size of a screen.

A method of displaying an image, comprising:

• transforming a color space of an input image into a color space representing a predetermined color of a letter-box area;
• detecting whether each pixel of each line of sequentially input frames of the input image is a pixel of the predetermined color;
• counting a number of pixels of the predetermined color detected in each line;
• detecting a maximum value of consecutive pixels of the predetermined color in each line;
• detecting a boundary of the letter-box area in each frame using the number of pixels counted and the maximum value of consecutive pixels of the predetermined color detected in each line;
• determining final boundaries of the letter-box area by determining a line to be one of the final boundaries of the letter-box area if the line is detected as the boundary of the letter-box area a predetermined number of times or more in the frames of the input image;
• and
• adjusting a size of the input image such that an image area within the final boundaries of the letter-box area is fit to a size of a screen.

A method of displaying an image having an image area and a letter-box area, comprising:

• detecting a position of a computer graphics interface in the letter-box area of the image;
• detecting boundaries separating the letter-box area and the image area of the image;
• adjusting the detected boundaries to include the position of the computer graphics interface in the image area;
• and
• adjusting a size of the image area including the position of the computer graphics interface to fit a size of a screen and displaying the adjusted image area including the position of the computer graphics interface on the screen.