Method for determining environment brightness and method for controlling display brightness using said method

A technology for ambient brightness and display control, which is applied to color TV components, TV system components, TVs, etc., and can solve problems such as incorrect determination of ambient brightness as a dark state
CN1426228AInactive Publication Date: 2003-06-25SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Publication Date
2003-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

Disclosed is a method for determining environmental brightness to appropriately control display brightness according to variations of the environmental brightness in different places in a mobile communication terminal including a camera having an automatic gain control (AGC) function, and a method for controlling the display brightness using the same, including the steps of calculating a luminance average of a center region of a photographed screen corresponding to an AGC reference region and a luminance average of an edge region except for the center region as brightness values from an image signal generated by photographing of the camera, comparing the brightness value of the edge region with a previously-set dark environmental critical value, comparing the brightness value of the center region with the brightness value of the edge region according to the comparison result, and determining that the environmental brightness is one of the bright state and the dark state, calculating a histogram of the luminance elements, and performing brightness contrast stretching, controlling the display brightness by adding or subtracting a previously-set control value to / from the brightness contrast stretched pixels according to environmental brightness determined by the method for determining the environmental brightness, and replacing the brightness-controlled luminance elements by the luminance elements of the image signal which will be transmitted to the display.
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Description

technical field

[0001] The invention relates to a mobile communication terminal, which includes a camera with an automatic gain control (AGC) function, in particular to a method for judging ambient brightness and controlling display brightness. Background technique

[0002] Recently, mobile communication terminals that not only display moving images but also transmit / receive images through cameras have been developed. The camera of such a mobile communication terminal is an image pickup device such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and has an AGC function. The AGC function automatically controls the light so that the average value of the brightness of the image of the reference area of ​​the AGC established in the central area of ​​the screen being photographed can be within a predetermined range. Therefore, it is possible to determine objects in bright or dark environments. Now briefly explain the AGC function. Calcula...

Claims

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