JP2005181602A - Mobile terminal with twin cameras - Google Patents

Mobile terminal with twin cameras Download PDF

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JP2005181602A
JP2005181602A JP2003420945A JP2003420945A JP2005181602A JP 2005181602 A JP2005181602 A JP 2005181602A JP 2003420945 A JP2003420945 A JP 2003420945A JP 2003420945 A JP2003420945 A JP 2003420945A JP 2005181602 A JP2005181602 A JP 2005181602A
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camera
luminance
light
portable terminal
light emission
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JP4543674B2 (en
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Yasuhide Higaki
康英 檜垣
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NEC Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To properly control the light quantity of a light emission means such as a back light for display part lighting and a light or an electronic flash light for camera photography while a front-side camera and a rear-side camera are used. <P>SOLUTION: Luminance information included in imaging data of the front-side camera and luminance information included in imaging data of the rear-side camera are used to calculate the luminance difference between the both, and light emission means such as the back light for display part lighting, light form camera photography, and electronic flash light for camera photography are controlled on the basis of the luminance difference. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、端末本体に正面側カメラと背面側カメラとを有する携帯電話機や簡易型携帯電話機（ＰＨＳ）や携帯情報端末等のツインカメラ付き携帯端末に関する。   The present invention relates to a mobile terminal with a twin camera such as a mobile phone, a simple mobile phone (PHS), or a personal digital assistant having a front-side camera and a rear-side camera in a terminal body.

このようなツインカメラ付き携帯端末は特許文献１（特開２００３−６０７６５号公報）で公知であるが、この特許文献１では、正面側カメラと背面側カメラの光学的な構造に関する開示はあるものの、これらカメラによる撮像データの取り扱いに関する開示はない。   Such a portable terminal with a twin camera is known in Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-60765). However, in Patent Document 1, although there is disclosure regarding the optical structure of the front camera and the rear camera. There is no disclosure regarding the handling of imaging data by these cameras.

一方、特許文献２（特開２００２−３４４５９８号公報）には、カメラの撮影時に、その露出に応じた蓄積時間をＣＰＵで算出し、その蓄積時間に基づいて液晶ディスプレイを照明するためのバックライトの照射レベルを決定することで、カメラの露光に応じてバックライトを調光する携帯電話機が開示されている。   On the other hand, in Patent Document 2 (Japanese Patent Laid-Open No. 2002-344598), a backlight for illuminating a liquid crystal display based on the accumulation time calculated by the CPU at the time of shooting with a camera is calculated. A mobile phone that adjusts the backlight according to the exposure of the camera by determining the irradiation level is disclosed.

しかし、これによると次のような問題点がある。
（１）カメラが背面のみのため、正面側（使用者側）の輝度が測定できない。
（２）カメラが背面のみのため、カメラを開いた状態で背面カメラを下にして例えば机上や床に置いてしまうと、必要以上にバックライトの輝度をあげてしまう。
（３）カメラが背面のみのため、正面側との輝度差がわからず、そのため逆光を検出できない。
特開２００３−６０７６５号公報 特開２００２−３４４５９８号公報 However, this has the following problems.
(1) Since the camera is only on the back side, the brightness on the front side (user side) cannot be measured.
(2) Since the camera is only on the back side, if the camera is opened and placed on the desk or floor with the back camera facing down, the brightness of the backlight is increased more than necessary.
(3) Since the camera is only on the back side, the difference in luminance from the front side is not known, and therefore backlight cannot be detected.
JP 2003-60765 A JP 2002-344598 A

本発明の課題は、正面側カメラと背面側カメラとを用いてこのような問題点を解決できる、つまり表示部照明用のバックライトやカメラ撮影用のライト又はフラッシュ等の発光手段を適切に調光できるようにすることにある。   An object of the present invention is to solve such a problem by using a front side camera and a rear side camera, that is, to appropriately adjust light emitting means such as a backlight for display unit illumination, a light for camera photographing, or a flash. There is to be able to light.

本発明は、端末本体に正面側カメラと背面側カメラとを有する携帯端末において、正面側カメラの撮像データと背面側カメラの撮像データとからそれぞれの輝度を測定する輝度測定手段と、その両者の輝度に基づいて表示部照明用のバックライトやカメラ撮影用のライトやカメラ撮影用のフラッシュ等の発光手段を制御する発光制御手段とを備えたことを特徴とする。   The present invention provides a portable terminal having a front camera and a rear camera in a terminal body, a luminance measuring means for measuring respective luminances from imaging data of the front camera and imaging data of the rear camera, and both of them. And a light emission control means for controlling light emission means such as a backlight for illumination of the display unit, a light for camera photographing, and a flash for camera photographing based on the luminance.

具体的には次のような形態が挙げられる。
輝度測定手段は、正面側カメラの撮像データに含まれる輝度情報と背面側カメラの撮像データに含まれる輝度情報とから輝度差を算出する。 Specifically, the following forms are mentioned.
The luminance measuring means calculates a luminance difference from the luminance information included in the imaging data of the front camera and the luminance information included in the imaging data of the rear camera.

発光制御手段は、輝度差の大小に応じてバックライトの輝度を制御する。又は、輝度差を閾値と比較し、その結果に応じてバックライトの輝度を制御する。更には、閾値を段階的に変えて、バックライトの輝度を段階的に制御する。   The light emission control means controls the luminance of the backlight according to the magnitude of the luminance difference. Alternatively, the luminance difference is compared with a threshold value, and the luminance of the backlight is controlled according to the result. Furthermore, the brightness of the backlight is controlled in stages by changing the threshold value in stages.

発光制御手段は、輝度差の大小に応じてカメラ撮影用のライト又はフラッシュの輝度を制御する。又は、輝度差を閾値と比較し、その結果に応じてカメラ撮影用のライト又はフラッシュの輝度を制御する。或いは、輝度差に係数を乗算した輝度変化分に応じてカメラ撮影用のライト又はフラッシュの輝度を制御する。   The light emission control means controls the luminance of the camera photographing light or flash according to the magnitude of the luminance difference. Alternatively, the luminance difference is compared with a threshold value, and the luminance of the camera photographing light or flash is controlled according to the result. Alternatively, the brightness of the camera photographing light or flash is controlled in accordance with the brightness change obtained by multiplying the brightness difference by a coefficient.

本発明によれば次に記載するような効果を奏する。
第１の効果は、ツインカメラにより背面と正面の輝度の差を得られるため、表示部照明用のバックライトやカメラ撮影用のライト又はフラッシュの輝度を周囲環境の様々な状況に応じて細かく自動調整したり、自動的にオン・オフすることができることである。
第２の効果は、背面側、正面側ともにカメラの輝度を利用しているため、輝度を検出するための部品を追加することなしに、背面と正面の輝度の差を時間差なく得られることである。 The present invention has the following effects.
The first effect is that the difference in brightness between the back and front can be obtained by the twin camera, so the brightness of the backlight for the display unit, the light for shooting the camera, or the flash is automatically adjusted according to the various conditions of the surrounding environment. It can be adjusted and turned on and off automatically.
The second effect is that the luminance of the camera is used on both the back side and the front side, so that the difference in luminance between the back side and the front side can be obtained without a time difference without adding components for detecting the luminance. is there.

次に、本発明の実施例を図面に基づいて詳細に説明する。   Next, embodiments of the present invention will be described in detail with reference to the drawings.

実施例１は、図１に示すように、上部筐体１と下部筐体２がヒンジ３を介して開閉可能に結合され、上部筐体１の正面にバックライト付きの液晶表示部（ＬＣＤディスプレイ）４、下部筐体２の正面に操作部５が設けられた折畳み型携帯電話機に適用した場合である。この携帯電話機には、その上部筐体１の正面上部に正面側カメラ６、上部筐体１の背面上部に背面側カメラ７が設けられ、ツインカメラ付きとなっている。また、上部筐体１の背面上部には、カメラ撮影用のライト又はフラッシュ８も設けられている。   In the first embodiment, as shown in FIG. 1, an upper casing 1 and a lower casing 2 are coupled through a hinge 3 so as to be openable and closable, and a liquid crystal display (LCD display) with a backlight is provided on the front of the upper casing 1. 4) This is a case where the present invention is applied to a foldable mobile phone in which the operation unit 5 is provided in front of the lower housing 2. This mobile phone is provided with a front camera 6 at the upper front of the upper casing 1 and a rear camera 7 at the upper rear of the upper casing 1 and is equipped with a twin camera. A light or flash 8 for camera photography is also provided on the upper back of the upper housing 1.

背面側カメラ７は、使用者と逆の側（使用者の見ている方向）を撮影でき、該カメラ７の撮像データからＹＵＶ形式のＹ（輝度情報）を得ることで、液晶表示部４と反対面の輝度情報を得ることができる。   The rear-side camera 7 can photograph the side opposite to the user (the direction the user is looking at), and obtains Y (luminance information) in YUV format from the imaging data of the camera 7. The luminance information of the opposite surface can be obtained.

正面側カメラ６は使用者の方向を撮影でき、該カメラ６の撮像データからＹＵＶ形式のＹ（輝度情報）を得ることで、液晶表示部４と同じ面の輝度情報を得ることができる。従って、このようなツインカメラによって、液晶表示部４と同じ面及び反対の面の輝度情報をほとんど時間差なく取得することが可能である。   The front-side camera 6 can capture the direction of the user, and Y (luminance information) in YUV format can be obtained from the imaging data of the camera 6 to obtain luminance information on the same surface as the liquid crystal display unit 4. Therefore, with such a twin camera, it is possible to acquire luminance information on the same surface as the liquid crystal display unit 4 and on the opposite surface with almost no time difference.

図２に本実施例のブロック図、図６にその動作例のフローチャートが示されている。
同図において、背面側カメラ７は画像撮影を行い（図６のステップＳ１）、撮像データをＣＰＵ９に送る（ステップＳ２）。
背面側カメラ７が撮像データをＣＰＵ９に送った直後に正面側カメラ６も撮影を行い（ステップＳ３）、撮像データをＣＰＵ９に送る（ステップＳ４）。 FIG. 2 is a block diagram of the present embodiment, and FIG. 6 is a flowchart of an operation example thereof.
In FIG. 6, the rear camera 7 takes an image (step S1 in FIG. 6), and sends image data to the CPU 9 (step S2).
Immediately after the rear camera 7 sends the imaging data to the CPU 9, the front camera 6 also takes a picture (step S3) and sends the imaging data to the CPU 9 (step S4).

ＣＰＵ９は、送られてきた背面側カメラ７からの撮像データ及び正面側カメラ６からの撮像データから輝度情報を取り出し（ステップＳ５及びＳ６）、それぞれの輝度の平均値を算出する（ステップＳ７及びＳ８）。そして、算出したそれぞれの輝度をもとに、ＣＰＵ９は液晶表示部４のバックライト１０の輝度を決定し（ステップＳ９）、バックライト１０の輝度を自動調整する（ステップＳ１０）。   The CPU 9 extracts luminance information from the image data received from the rear camera 7 and the image data received from the front camera 6 (steps S5 and S6), and calculates the average value of each luminance (steps S7 and S8). ). Then, based on the calculated luminances, the CPU 9 determines the luminance of the backlight 10 of the liquid crystal display unit 4 (step S9), and automatically adjusts the luminance of the backlight 10 (step S10).

例えば、図３に示すように、この携帯電話機が液晶表示部４の表示面を下にして置かれているような場合、背面側カメラ７からの輝度にくらべ、正面側カメラ６からの輝度は著しく低い値となる。そこで、ＣＰＵ９は、開閉検出スイッチ１１で上下の筐体１・２が開状態であることが検知され、なお且つ背面側カメラ７の輝度＞＞正面側カメラ６の輝度の輝度差になっていたとき、上下の筐体１・２が開いたまま机上又は床に置かれていると判断し、バックライト１０の輝度を下げる。   For example, as shown in FIG. 3, when this mobile phone is placed with the display surface of the liquid crystal display unit 4 facing down, the luminance from the front camera 6 is higher than the luminance from the rear camera 7. Remarkably low value. Therefore, the CPU 9 detects that the upper and lower casings 1 and 2 are in the open state by the open / close detection switch 11, and the luminance difference of the rear camera 7 >>> the luminance of the front camera 6. At this time, it is determined that the upper and lower casings 1 and 2 are open and placed on the desk or the floor, and the brightness of the backlight 10 is lowered.

一方、図４に示すように上下の筐体１・２を開いて立てた状態として、背面側カメラ７の輝度が正面側カメラ６よりも高いがその差が少ない場合には、ＣＰＵ９は、正面側カメラ６の輝度をもとにバックライト１０の輝度を上げる。   On the other hand, when the upper and lower casings 1 and 2 are opened as shown in FIG. 4 and the brightness of the rear camera 7 is higher than that of the front camera 6 but the difference is small, the CPU 9 The brightness of the backlight 10 is increased based on the brightness of the side camera 6.

図７は実施例２のフローチャートで、図１及び図に示したようなツインカメラ付き携帯電話機において、カメラ撮影用ライト又はフラッシュ８をオン・オフ制御する場合である。   FIG. 7 is a flowchart of the second embodiment, in which the camera photographing light or flash 8 is controlled to be turned on / off in the twin camera mobile phone as shown in FIGS.

同図において、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ１１及びＳ１２）、両者の輝度差を予め設定されている閾値と比較し（ステップＳ１３）、輝度差が閾値より大きいときはカメラ撮影用ライト又はフラッシュ８をオンとし（ステップＳ１４）、逆に小さいときはカメラ撮影用ライト又はフラッシュ８をオフとする（ステップＳ１５）。   In the figure, the respective luminance measurements are performed from the respective imaging data of the rear side camera 7 and the front side camera 6 (steps S11 and S12), and the luminance difference between them is compared with a preset threshold value (step S13). When the brightness difference is larger than the threshold, the camera photographing light or flash 8 is turned on (step S14), and when it is smaller, the camera photographing light or flash 8 is turned off (step S15).

例えば、図５に示すように被写体が光源を背にしている状態で、背面側カメラ７で撮影しようとした場合、逆光となる。この場合、背面側カメラ７からの輝度と正面側カメラ６からの輝度差からＣＰＵ９は逆光であることを判断でき、自動的にカメラ撮影用ライト又はフラッシュ８をＯＮにすることができる。   For example, as shown in FIG. 5, when an image is taken with the rear-side camera 7 in a state where the subject is facing the light source, backlighting occurs. In this case, the CPU 9 can determine that the backlight is backlit from the luminance difference from the rear camera 7 and the luminance from the front camera 6, and can automatically turn on the camera photographing light or flash 8.

図８は実施例３のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ２１及びＳ２２）、両者の輝度を比較して（ステップＳ２３）、背面側カメラ７による測定輝度が正面側カメラ６による測定輝度より大きいときは、バックライト１０の輝度を上げ（ステップＳ２４）、そうでないときはバックライト１０の輝度を保持する（ステップＳ２５）。   FIG. 8 is a flowchart of the third embodiment. Each brightness measurement is performed from the respective imaging data of the rear camera 7 and the front camera 6 (steps S21 and S22), and the brightness of both is compared (step S23). When the brightness measured by the rear camera 7 is higher than the brightness measured by the front camera 6, the brightness of the backlight 10 is increased (step S24), and otherwise, the brightness of the backlight 10 is held (step S25).

図９は実施例４のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ３１及びＳ３２）、両者の輝度差を予め設定されている閾値と比較し（ステップＳ３３）、輝度差が閾値より大きいときは、バックライト１０の輝度を上げてから（ステップＳ３４）、次の閾値を設定して（ステップＳ３５）、同様の動作を繰り返す。輝度差が閾値より小さいときは、バックライト１０の輝度を保持する（ステップＳ３６）。このようにすると、バックライト１０の輝度を段階的に上昇調整できる。   FIG. 9 is a flowchart of the fourth embodiment. Each luminance measurement is performed from the respective imaging data of the rear side camera 7 and the front side camera 6 (steps S31 and S32), and a difference between the two is set to a preset threshold value. (Step S33), if the luminance difference is larger than the threshold, the luminance of the backlight 10 is increased (step S34), the next threshold is set (step S35), and the same operation is repeated. When the luminance difference is smaller than the threshold value, the luminance of the backlight 10 is held (step S36). In this way, the brightness of the backlight 10 can be increased and adjusted stepwise.

図１０は実施例５のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ４１及びＳ４２）、両者の輝度を比較して（ステップＳ４３）、図８の実施例３の場合とは逆に、背面側カメラ７による測定輝度が正面側カメラ６による測定輝度より小さいときは、バックライト１０の輝度を下げ（ステップＳ４４）、そうでないときはバックライト１０の輝度を保持する（ステップＳ４５）。   FIG. 10 is a flowchart of the fifth embodiment. Each brightness measurement is performed from the respective imaging data of the rear camera 7 and the front camera 6 (steps S41 and S42), and the brightness of both is compared (step S43). Contrary to the case of the third embodiment in FIG. 8, when the measured brightness by the rear camera 7 is smaller than the measured brightness by the front camera 6, the brightness of the backlight 10 is lowered (step S44). The brightness of the backlight 10 is held (step S45).

図１１は実施例６のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ５１及びＳ５２）、両者の輝度差を予め設定されている閾値と比較し（ステップＳ５３）、図９の実施例４の場合とは逆に、輝度差が閾値より小さいときは、バックライト１０の輝度を下げてから（ステップＳ５４）、次の閾値を設定して（ステップＳ５５）、同様の動作を繰り返す。輝度差が閾値より小さいときは、バックライト１０の輝度を保持する（ステップＳ５６）。このようにすると、バックライト１０の輝度を段階的に下降調整できる。   FIG. 11 is a flowchart of the sixth embodiment. Each luminance measurement is performed from the respective imaging data of the rear side camera 7 and the front side camera 6 (steps S51 and S52), and a difference between the two is set as a preset threshold value. (Step S53), contrary to the case of the fourth embodiment in FIG. 9, when the luminance difference is smaller than the threshold value, the luminance of the backlight 10 is lowered (step S54), and the next threshold value is set. (Step S55), the same operation is repeated. When the luminance difference is smaller than the threshold value, the luminance of the backlight 10 is held (step S56). In this way, the brightness of the backlight 10 can be adjusted stepwise down.

図１２は、カメラ撮影用ライト８を使用する実施例７のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ６１及びＳ６２）、両者の輝度を比較して（ステップＳ６３）、背面側カメラ７による測定輝度が正面側カメラ６による測定輝度より大きいときは、その輝度差に係数を乗算することによりカメラ撮影用ライト８の輝度増加分を計算する（ステップＳ６４）。そして、その増加分だけカメラ撮影用ライト８の輝度を上げてこれをオンさせる（ステップＳ６５）。一方、背面側カメラ７による測定輝度が正面側カメラ６による測定輝度より大きくないときは、カメラ撮影用ライト８をオフとする（ステップＳ６６）。   FIG. 12 is a flowchart of the seventh embodiment using the camera photographing light 8, and the respective brightness measurements are performed from the respective imaging data of the rear side camera 7 and the front side camera 6 (steps S61 and S62). When the brightness is compared (step S63) and the measured brightness by the rear camera 7 is larger than the measured brightness by the front camera 6, the brightness difference of the camera photographing light 8 is calculated by multiplying the brightness difference by a coefficient. Calculate (step S64). Then, the brightness of the camera photographing light 8 is increased by the increased amount and turned on (step S65). On the other hand, when the measured brightness by the rear camera 7 is not larger than the measured brightness by the front camera 6, the camera photographing light 8 is turned off (step S66).

図１３は、カメラ撮影用ライト８を使用する実施例８のフローチャートで、背面側カメラ７及び正面側カメラ６のそれぞれの撮像データから、それぞれの輝度測定を行い（ステップＳ７１及びＳ７２）、両者の輝度差を予め設定されている閾値と比較し（ステップＳ７３）、輝度差が閾値より大きいときは、その輝度差に係数を乗算することによりカメラ撮影用ライト８の輝度増加分を計算する（ステップＳ７４）。そして、その増加分だけカメラ撮影用ライト８の輝度を上げてこれをオンさせる（ステップＳ７５）。一方、輝度差が閾値よりも大きくないときは、カメラ撮影用ライト８をオフとする（ステップＳ７６）。   FIG. 13 is a flowchart of the eighth embodiment in which the camera photographing light 8 is used. The respective luminance measurements are performed from the respective imaging data of the rear side camera 7 and the front side camera 6 (steps S71 and S72). The luminance difference is compared with a preset threshold value (step S73). If the luminance difference is larger than the threshold value, the luminance difference of the camera photographing light 8 is calculated by multiplying the luminance difference by a coefficient (step S73). S74). Then, the brightness of the camera photographing light 8 is increased by the increased amount and turned on (step S75). On the other hand, when the luminance difference is not larger than the threshold value, the camera photographing light 8 is turned off (step S76).

本発明は、図１に示したような折畳み型携帯電話機に限らず、上部筐体が下部筐体に対してヒンジ軸の回りを回転できる回転型携帯電話機や、上部筐体と下部筐体とが相対的にスライドするスライド型携帯電話機や、一体型携帯電話機等の他の型の携帯電話機に適用できるばかりでなく、携帯情報端末などの他の携帯端末にも適用できる。   The present invention is not limited to the foldable mobile phone as shown in FIG. 1, but a rotary mobile phone in which the upper housing can rotate around the hinge axis with respect to the lower housing, and the upper housing and the lower housing. The present invention can be applied not only to other types of mobile phones such as a mobile phone that slides relatively, but also to other mobile terminals such as a portable information terminal.

本発明を適用した折畳み型携帯電話機の斜視図で、（Ａ）は正面側、（Ｂ）は背面側である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a foldable mobile phone to which the present invention is applied, in which (A) is a front side and (B) is a back side. その構成を示すブロック図である。It is a block diagram which shows the structure. 液晶表示部の表示面を下にして置いた状態を示す側面図である。It is a side view which shows the state which put the display surface of the liquid crystal display part down. 上下の筐体を開いて立てた状態でカメラ撮影するときの状態を示す斜視図である。It is a perspective view which shows the state at the time of camera photography in the state which opened and stood the upper and lower cases. 逆光でカメラ撮影するときの状態を示す斜視図である。It is a perspective view which shows a state when camera photography is performed with backlight. 実施例１の動作を示すフローチャートである。3 is a flowchart illustrating the operation of the first embodiment. 実施例２の動作を示すフローチャートである。10 is a flowchart showing the operation of the second embodiment. 実施例３の動作を示すフローチャートである。10 is a flowchart illustrating the operation of the third embodiment. 実施例４の動作を示すフローチャートである。10 is a flowchart illustrating the operation of the fourth embodiment. 実施例５の動作を示すフローチャートである。10 is a flowchart showing the operation of the fifth embodiment. 実施例６の動作を示すフローチャートである。10 is a flowchart showing the operation of the sixth embodiment. 実施例７の動作を示すフローチャートである。10 is a flowchart showing the operation of the seventh embodiment. 実施例８の動作を示すフローチャートである。10 is a flowchart illustrating the operation of an eighth embodiment.

符号の説明Explanation of symbols

１ 上部筐体
２ 下部筐体
３ ヒンジ
４ 液晶表示部
５ 操作部
６ 正面側カメラ
７ 背面側カメラ
８ カメラ撮影用のライト又はフラッシュ
９ ＣＰＵ
１０ バックライト
１１ 開閉検出スイッチ DESCRIPTION OF SYMBOLS 1 Upper housing | casing 2 Lower housing | casing 3 Hinge 4 Liquid crystal display part 5 Operation part 6 Front side camera 7 Back side camera 8 Light or flash 9 for camera photography 9 CPU
10 Backlight 11 Open / close detection switch

Claims (10)

端末本体に正面側カメラと背面側カメラとを有する携帯端末において、前記正面側カメラの撮像データと前記背面側カメラの撮像データとからそれぞれの輝度を測定する輝度測定手段と、その両者の輝度に基づいて発光手段を制御する発光制御手段とを備えたことを特徴とするツインカメラ付き携帯端末。   In a portable terminal having a front-side camera and a rear-side camera in the terminal body, luminance measuring means for measuring the respective luminances from the imaging data of the front-side camera and the imaging data of the rear-side camera, and the luminance of both A portable terminal with a twin camera, comprising: a light emission control means for controlling the light emission means on the basis thereof. 輝度測定手段は、正面側カメラの撮像データに含まれる輝度情報と背面側カメラの撮像データに含まれる輝度情報とから両者間の輝度差を算出し、発光制御手段はその輝度差に基づいて発光手段を制御することを特徴とする請求項１に記載のツインカメラ付き携帯端末。   The luminance measuring unit calculates a luminance difference between the luminance information included in the imaging data of the front camera and the luminance information included in the imaging data of the rear camera, and the light emission control unit emits light based on the luminance difference. The portable camera-equipped mobile terminal according to claim 1, wherein the means is controlled. 発光手段が端末本体の表示部照明用のバックライトであることを特徴とする請求項１又は２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 1 or 2, wherein the light emitting means is a backlight for illuminating the display section of the terminal body. 発光制御手段は、輝度差の大小に応じてバックライトの輝度を制御することを特徴とする請求項２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 2, wherein the light emission control means controls the luminance of the backlight according to the magnitude of the luminance difference. 発光制御手段は、輝度差を閾値と比較し、その結果に応じてバックライトの輝度を制御することを特徴とする請求項２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 2, wherein the light emission control means compares the luminance difference with a threshold value and controls the luminance of the backlight according to the result. 発光制御手段は、閾値を段階的に変えて、バックライトの輝度を段階的に制御することを特徴とする請求項５に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 5, wherein the light emission control means changes the threshold value stepwise to control the luminance of the backlight stepwise. 発光手段がカメラ撮影用のライト又はフラッシュであることを特徴とする請求項１又は２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 1 or 2, wherein the light emitting means is a light or flash for photographing a camera. 発光制御手段は、輝度差の大小に応じてカメラ撮影用のライト又はフラッシュの輝度を制御することを特徴とする請求項２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 2, wherein the light emission control means controls the brightness of the light or flash for photographing the camera according to the brightness difference. 発光制御手段は、輝度差を閾値と比較し、その結果に応じてカメラ撮影用のライト又はフラッシュの輝度を制御することを特徴とする請求項２に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 2, wherein the light emission control means compares the luminance difference with a threshold value and controls the luminance of the light or flash for photographing the camera according to the result. 発光制御手段は、輝度差に係数を乗算した輝度変化分に応じてカメラ撮影用のライト又はフラッシュの輝度を制御することを特徴とする請求項８又は９に記載のツインカメラ付き携帯端末。   The portable terminal with a twin camera according to claim 8 or 9, wherein the light emission control means controls the brightness of the camera photographing light or flash according to a luminance change obtained by multiplying the luminance difference by a coefficient.
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