13.80700 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種色序法，且特別有關於一種基於 ’ 焭度/色差色彩空間之分色技術的色序法。 【先前技術】 % 色序型液晶顯示器（Field Sequential Color LCD, FSC • —LCD)是一超薄且具高解析度與高色彩飽和度的次世代 顯示器。此顯示技術最常見的原理是利用三原色場（紅、 綠、藍）在人眼視覺暫留的時間内，利用時間混色法’進 行累加三原色來合成彩色圖像。此技術有下列優點：（1)場 色序型液晶顯示器不需彩色濾光片’因此提高了三倍的光 穿透率，此也意指將可減少顯示器功率損耗；（2)相較傳統 有彩色濾光片的顯示器須由三個紅、綠、藍色子晝素組成 個畫素，場色序型液晶顯示器中的晝素較小因而提高了 鲁，器解析度’或者維持原解析度而減少薄膜電晶體—液 日日顯不器（Thin Film Transistor (TFT) —LCD)的成本； P)%色序型液晶顯示器之背光由三原色的紅、綠、藍發光 —極體（Light—emitting Diode，LED)組成，其會提升影 =色心飽和度，以及（4)由於無需使用彩色濾光片因而可 M低顯不器生產成本。因此，色序法（Color Sequential ethod)顯示技術將成為新—代高晝質綠色環保顯示器的 重要技術。 j而，％色序型液晶顯示器雖具有比其他的顯示技術 5 1380700 ·_ r • 更好的顯色特性且能大大降低顯示器功率消耗，卻存在著 〆個嚴重的問題，即會發生色分離（C〇l〇r Break — up ) 〇 此規象發生在當人眼與觀看物體有一相對速度時，造成同 一畫面的各色場（例如’紅、綠、藍三色場）成像在視網 • 膜上的疊加，其影像於疊加後邊緣卻在不同位置，因而出 現邊緣有類似彩虹色帶的現象’此稱為色分離現象。色分 離規象除了降低影像品質外，長時間的觀看其影像亦有可 能造成眼睛的疲勞，這些為場色序型液晶顯示器中一個不 參玎忽視的現象。 因此，本發明提供了一種基於亮度/色差色彩空間之分 色技術的色序法，以改善傳統色序法易產生色分離的問題。 【發明内容】 基於上述目的’本發明實施例揭露了 一種基於亮度/色 差色彩空間之分色技術之色序法。將〜輪入影像之訊號從 RGB色彩空間轉換為YCbCr色彩空間，並且將YCbCr訊號 • 拆解為Y亮度訊號以及+Cb、一Cb、+cr與—Cr等四個色差 訊號。並將亮度訊號分別分配給+Cb、〜Cb、+Cr與—匕之 色差訊號，及計算每一色差訊號所需之亮度值，並且經過 冗度分配後所產生新的+cb、一 Cb、+Cr與一 cr色差訊號。 本發明實施例更揭露了一種顯示裴置，包括一螢幕、 一影像輸入模組與一影像處理單元。該影像輸入模組自一 影像來源取得一輸入影像。該影像處理單元將該輸入影像 訊號從RGB色彩空間轉換為YCbCr色彩空間，將YCbCr 訊號之γ亮度訊號進行拆解以及+cb、〜Cb、+Cr與—Cr 6 1380700 等四個色差訊號，將Y亮度訊號分別分配給+cb、一cb、 +cr與一cr之色差訊號.，並計算每一色差訊號需要的亮度 值，以及根據計算分配亮度給色差訊號，並產生新的+cb、 -cb、+cr與一cr色差訊號。 【實施方式】 為了讓本發明之目的、特徵、及優點能更明顯易懂， 下文特舉較佳實施例，並配合所附圖式第1圖至第4圖， • 做詳細之說明。本發明說明書提供不同的實施例來說明本 發明不同實施方式的技術特徵。其中，實施例中的各元件 之配置係為說明之用，並非用以限制本發明。且實施例中 圖式標號之部分重複，係為了簡化說明，並非意指不同實 施例之間的關聯性。 本發明實施例揭露了 一種基於亮度/色差色彩空間之 分色技術的色序法。 如上文所述，傳統的色序法係直接利用RGB三原色在 Φ 同一時間切換而達到所須顯示之顏色，而非使用彩色濾光 片，可達到節能與成本效益，但其缺點為晝面易產生色分 離，且侷限在RGB色彩空間而不易擴充調整及色彩調整。 本發明實施例之色序法係利用YCbCr色差訊號來達到 所須顯示之顏色。 第1圖係顯示本發明實施例之基於亮度/色差色彩空間 之分色技術之色序法的步驟流程圖。第2圖係顯示本發明 實施例之基於亮度/色差色彩空間之分色技術之色序法的 實施流程圖。 7 1380700 首先，將一輸入影像之RGB色彩空間轉麵 色彩空間（如第3圖所示）（步帮sn)，如 之21〇 與細所心YCbCr值和三原色咖值（非線性）存在著 3x3矩陣關孫，其中，γ代表影像的亮度，*表示 色差訊號H矩陣方程式將咖色彩空間轉換為 YCbCr色彩空間，該矩陣方程式表示為：13.80700 IX. Description of the Invention: [Technical Field] The present invention relates to a color sequential method, and more particularly to a color sequential method based on a color separation technique of a color/color difference color space. [Prior Art] The % Sequential Color LCD (FSC • - LCD) is an ultra-thin, next-generation display with high resolution and high color saturation. The most common principle of this display technique is to use the three primary color fields (red, green, and blue) to synthesize color images using the time-mixing method to accumulate the three primary colors during the duration of the human eye's persistence. This technology has the following advantages: (1) The field color sequential liquid crystal display does not require a color filter 'thus, thereby increasing the light transmittance by three times, which also means that the display power loss can be reduced; (2) compared with the conventional A display with color filters must consist of three red, green, and blue sub-tendins, and the pixels in the field-sequence liquid crystal display are small, thus improving the resolution of the device, or maintaining the original resolution. To reduce the cost of Thin Film Transistor (TFT)-LCD; P) The backlight of the color-sequence LCD is composed of three primary colors of red, green and blue. The composition of the -emitting Diode (LED), which enhances the shadow = color saturation, and (4) the low production cost due to the elimination of the use of color filters. Therefore, Color Sequential ethod display technology will become an important technology for new high-quality green displays. However, although the % color sequential liquid crystal display has better color rendering characteristics than other display technologies 5 1380700 ·_r • and can greatly reduce the power consumption of the display, there is a serious problem that color separation occurs. (C〇l〇r Break — up ) This rule occurs when the human eye has a relative velocity to the viewing object, causing the color fields of the same picture (such as 'red, green, and blue color fields') to be imaged on the screen. The superimposition on the film, the image is superimposed on the edge but at different positions, so the edge has a phenomenon similar to the iridescent color band. This is called color separation phenomenon. In addition to reducing the image quality, the color separation specification may cause eye fatigue when viewed for a long time. These are phenomena that are not neglected in the field color sequential liquid crystal display. Accordingly, the present invention provides a color sequential method based on a color separation technique of luminance/chromatic aberration color space to improve the problem that color separation is easily generated by the conventional color sequential method. SUMMARY OF THE INVENTION Based on the above objects, an embodiment of the present invention discloses a color sequential method based on a color separation technique of a luminance/chromatic aberration color space. The signal of the rounded image is converted from the RGB color space to the YCbCr color space, and the YCbCr signal is disassembled into a Y luminance signal and four color difference signals such as +Cb, Cb, +cr and -Cr. And assigning the luminance signals to the color difference signals of +Cb, ~Cb, +Cr, and -, respectively, and calculating the brightness values required for each color difference signal, and generating a new +cb, a Cb, after the redundancy allocation. +Cr and a cr color difference signal. The embodiment of the invention further discloses a display device, including a screen, an image input module and an image processing unit. The image input module obtains an input image from an image source. The image processing unit converts the input image signal from the RGB color space to the YCbCr color space, disassembles the γ brightness signal of the YCbCr signal, and four color difference signals such as +cb, ~Cb, +Cr, and -Cr 6 1380700, The Y luminance signals are respectively assigned to the color difference signals of +cb, a cb, +cr and a cr, and the luminance values required for each color difference signal are calculated, and the luminance is assigned to the color difference signals according to the calculation, and a new +cb, - is generated. Cb, +cr and a cr color difference signal. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, features, and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail with reference to Figures 1 through 4 of the drawings. The present specification provides various embodiments to illustrate the technical features of various embodiments of the present invention. The arrangement of the various elements in the embodiments is for illustrative purposes and is not intended to limit the invention. The repeated reference numerals in the embodiments are intended to simplify the description and do not imply the relationship between the different embodiments. Embodiments of the present invention disclose a color sequential method based on a color separation technique of a luminance/chromatic aberration color space. As described above, the conventional color-sequence method directly uses RGB three primary colors to switch at the same time to achieve the desired color, instead of using color filters, which can achieve energy saving and cost-effectiveness, but the disadvantage is that Produces color separation and is limited to RGB color space without easy adjustment and color adjustment. The color sequential method of the embodiment of the present invention utilizes the YCbCr color difference signal to achieve the desired color. Fig. 1 is a flow chart showing the steps of the color sequential method of the color separation technique based on the luminance/chromatic aberration color space in the embodiment of the present invention. Fig. 2 is a flow chart showing the implementation of the color sequential method based on the color separation technique of the luminance/chromatic aberration color space in the embodiment of the present invention. 7 1380700 First, the RGB color space of an input image is converted into a color space (as shown in Figure 3) (step sn), such as 21〇 and the fine center YCbCr value and the three primary color values (non-linear) exist. 3x3 matrix Guan Sun, where γ represents the brightness of the image, * represents the color difference signal H matrix equation converts the coffee color space into the YCbCr color space, and the matrix equation is expressed as:
τ' 0-2990 0.5870 〇.ll4〇-i •R = -0.1687 -0.3313 0.5000 X G 0.5000 -0.4187 -0.0813 Bτ' 0-2990 0.5870 〇.ll4〇-i •R = -0.1687 -0.3313 0.5000 X G 0.5000 -0.4187 -0.0813 B
需注意到，將像素之RGB色彩空間轉換為YCbCr色彩 空間之該矩陣方程式僅係為—實施例，其並非用以限制本 發明。 接著，將YCbCr訊號拆解為γ亮度訊號以及+cb、— Cb、+Cr與一Cr等四個色差訊號（步驟S12)(如第2圖之 230所示）’而產生具有四個象限之二維平面，其中此二 維平面的X軸表示紅綠色差訊號，而y軸表示黃藍色差訊 號。 人眼視覺特性為對亮度訊號的解析度最高，紅綠訊號 次之’黃藍訊號最低。在YCbCr色差訊號之色彩空間下（其 係修改YUV色彩空間而得），Y訊號代表亮度 (Luminance)，C“ Yellow-Blue channel)與 Cr( Red-Green channel)訊號代表彩度資訊之黃藍色差以及紅綠色差。如 果像素中只包含彩度資訊是無法呈現色彩到人眼中，因此 6 1380700 將冗度訊號女別分配給+cb、一 cb、+Cr與_ Cr這四個色差 訊號（步驟SI3) ’如第2圖之240與250所示。 在本發明實施例中，將在rGb色彩空間下之訊號最強 之紅色(255, 0, 0)、綠色（〇, 255, 〇)、藍色(0, 〇, 255)與黃色 (255，255，0)轉換到亮度/色差空間以觀察其亮度之值，分 別取其亮度值。舉例來說，Y(紅色)=3〇，γ(綠色)=59，γ(藍 色)=11，Y(黃色)=89’將影像像素之亮度依照比例分配（ex 30:59:11:89)給四個色差訊號之色頻。利用下述方程式計 算每一色差訊號需要的亮度值，其分別表示為： Pixel_YR(x,y)= Pixel_Ytotal(x,y)/(30+59+l 1+89)*3〇 ;It is noted that the matrix equation for converting the RGB color space of a pixel to the YCbCr color space is merely an embodiment, which is not intended to limit the invention. Then, the YCbCr signal is disassembled into four gamma luminance signals and four color difference signals such as +cb, -Cb, +Cr, and one Cr (step S12) (as shown by 230 in FIG. 2) to generate four quadrants. A two-dimensional plane in which the X-axis of the two-dimensional plane represents a red-green difference signal, and the y-axis represents a yellow-blue difference signal. The visual characteristics of the human eye have the highest resolution for the luminance signal, and the red and green signals have the lowest 'yellow blue signal'. In the color space of the YCbCr color difference signal (which is modified by the YUV color space), the Y signal represents Luminance, C "Yellow-Blue channel" and Cr (Red-Green channel) signals represent the yellow and blue of the chroma information. The color difference and the red-green color difference. If the pixel only contains the chroma information, the color cannot be presented to the human eye. Therefore, 6 1380700 assigns the redundancy signal to the four color difference signals of +cb, one cb, +Cr and _Cr ( Steps SI3)' are shown as 240 and 250 in Fig. 2. In the embodiment of the present invention, the strongest signal (255, 0, 0), green (〇, 255, 〇), and the signal in the rGb color space are Blue (0, 〇, 255) and yellow (255, 255, 0) are converted to the luminance/color difference space to observe the value of their luminance, and their luminance values are respectively taken. For example, Y (red) = 3 〇, γ (green) = 59, γ (blue) = 11, Y (yellow) = 89' The brightness of the image pixels is assigned proportionally (ex 30:59:11:89) to the color frequency of the four color difference signals. The equation calculates the brightness values required for each color difference signal, which are expressed as: Pixel_YR(x, y) = Pixel_Ytotal(x, y) / (30 + 59 + l 1 + 89) * 3 〇;
Pixel_YG(x?y)=Pixel_Ytotal(x,y)/(30+59+ll+89)*59 ； Pixel_YB(x，y)=Pixel_Ytotal(x，y)/(30+59+ll+89)*ll;#& Pixel_YY(x,y)= Pixel_Ytotal(x,y)/(30+59+l l+89)*89 ; 其中，Pixel_Ytotal(x，y)表示該輸入影像之每個像素的 原始亮度，Pixel_YR(x，y)表示計算出+cr色差（色頻）訊號 值需要多少亮度值’？匕61一丫<3(\，7)表示計算出一(^色差（色 頻）訊號值需要多少亮度值，而Pixel_YB(x，y)表示計算出 -Cb色差（色頻）訊號值需要多少亮度值，而pixei_YY(x，y) 表示計算出+Cb色差（色頻）訊號值需要多少亮度值。 如此一來’利用上述方程式即可計算出四個色差訊號 分別所需之亮度值，並且根據計算所得的亮度值產生新的 +(：1)、一(：1)、+(^與一(^色差訊號（步驟814)，如第2圖 之260所示。 第4圖係顯示本發明實施例之顯示裝置的架構示意 9 1380700 本發明實施例之顯示裝置400至少包括一影像輸入模 組410、一影像處理單元430與一螢幕450。 影像輸入模組410自一影像來源取得一輸入影像，影 像處理單元430將該輸入影像之RGB色彩空間轉換為 YCbCr色彩空間（如第3圖所示），接著將YCbCr訊號拆 解為Y焭度訊號以及+Cb、一 Cb、+Cr與一cr等四個色差訊 號，並且將亮度訊號分別分配給+Cb、一 Cb、+Cr與一Cr這 四個色差訊號。 在本發明實施例中，將訊號最強之紅色(255, 0,0)、綠 色(0, 255, 0)、藍色(0, 〇, 255)與黃色(255, 255, 0)轉換到亮 度/色差空間以觀察其亮度之值。舉例來說，γ(紅色)=3〇， Y(綠色)=59 ’ Y(藍色)=11，Y(黃色)=89，將影像像素之亮 度依照比例分配給四個色差訊號之色頻。利用下述方程式 計算每一色差訊號需要的亮度值，其分別表示為： pixel_YR(x，y)= Pixel—Ytotal(x，y)/(30+59+l 1+89)*30 Pixel_YG(x，y)= Pixel一Ytotal(x，y)/(30+59+l 1+89)*59 PiXel_YB(x，y)= Pixel_Ytotal(x，y)/(30+59+l 1+89)* 11 PixelYY(x，y)= Pixel—Ytotal(x，y)/(30+59+ll+89)*89Pixel_YG(x?y)=Pixel_Ytotal(x,y)/(30+59+ll+89)*59 ; Pixel_YB(x,y)=Pixel_Ytotal(x,y)/(30+59+ll+89)* Ll;#& Pixel_YY(x,y)= Pixel_Ytotal(x,y)/(30+59+l l+89)*89 ; where Pixel_Ytotal(x,y) represents the original of each pixel of the input image Brightness, Pixel_YR(x, y) indicates how much brightness value is needed to calculate the +cr color difference (color frequency) signal value?匕61丫<3(\,7) indicates how many luminance values are needed to calculate a (color difference) signal value, and Pixel_YB(x, y) indicates that the -Cb color difference (color frequency) signal value is needed. How many brightness values, and pixei_YY(x,y) indicates how much brightness value is needed to calculate the +Cb color difference (color frequency) signal value. Thus, using the above equation, the brightness values required for the four color difference signals can be calculated. And generating a new + (: 1), a (: 1), + (^ and a (^ color difference signal (step 814) according to the calculated brightness value, as shown in Figure 260 of Figure 2. Figure 4 shows The display device 400 of the embodiment of the present invention includes at least an image input module 410, an image processing unit 430 and a screen 450. The image input module 410 obtains a video source. Input image, the image processing unit 430 converts the RGB color space of the input image into a YCbCr color space (as shown in FIG. 3), and then disassembles the YCbCr signal into a Y-degree signal and +Cb, a Cb, a +Cr and One cr and four color difference signals, and the brightness signals are respectively The four color difference signals are assigned to +Cb, a Cb, +Cr and a Cr. In the embodiment of the present invention, the strongest red (255, 0, 0), green (0, 255, 0), blue (0, 〇, 255) and yellow (255, 255, 0) are converted to the luminance/color difference space to observe the value of its brightness. For example, γ (red) = 3 〇, Y (green) = 59 'Y ( Blue) = 11, Y (yellow) = 89, the brightness of the image pixels is proportionally assigned to the color frequency of the four color difference signals. The brightness values required for each color difference signal are calculated by the following equation, which are respectively expressed as: pixel_YR (x,y)= Pixel—Ytotal(x,y)/(30+59+l 1+89)*30 Pixel_YG(x,y)= Pixel-Ytotal(x,y)/(30+59+l 1 +89)*59 PiXel_YB(x,y)= Pixel_Ytotal(x,y)/(30+59+l 1+89)* 11 PixelYY(x,y)= Pixel—Ytotal(x,y)/(30+ 59+ll+89)*89
以及 其中，Pixel_Ytotal(x，y)表示該輸入影像之每個像素的 原始亮度，Pixel—YR(x，y)表示計算出+Cr色差訊號值需要多 少亮度值，Pixel_YG(x，y)表示計算出-Cr色差訊號值需要 多少亮度值，而Pixel_YB(x，y)表示計算出一Cb色差訊號值 需要多少亮度值，而Pixel一YY(x，y)表示計算出+cb色差訊 10 1380700 號值需要多少亮度值。 影像處理單元430利用上述方程式即可計算出四個色 差訊號分別所需之亮度值，並且根據計算所得的亮度值產 生新的+Cb、— Cb、+Cr與一Cr色差訊號，然後將處理過之 該輸入影像顯示在螢幕450上。 本發明實施例之基於亮度/色差色彩空間之分色技術 的色序法將YCbCr色差訊號中之cb色差訊號作為藍色與黃 色訊號值，並將Cr色差訊號作為紅色與綠色訊號值，並且And wherein Pixel_Ytotal(x, y) represents the original brightness of each pixel of the input image, Pixel_YR(x, y) represents how much brightness value is needed to calculate the value of the +Cr color difference signal, and Pixel_YG(x, y) represents the calculation How much brightness value is required for the -Cr color difference signal value, and Pixel_YB(x,y) indicates how much brightness value is needed to calculate a Cb color difference signal value, and Pixel-YY(x,y) indicates that +cb color difference signal 10 1380700 is calculated. How many brightness values are needed for the value. The image processing unit 430 can calculate the brightness values required for the four color difference signals by using the above equation, and generate new +Cb, -Cb, +Cr, and a Cr color difference signals according to the calculated brightness values, and then process the processed signals. The input image is displayed on the screen 450. The color sequential method based on the color separation technique of the luminance/chromatic aberration color space in the embodiment of the present invention uses the cb color difference signal in the YCbCr color difference signal as the blue and yellow signal value, and uses the Cr color difference signal as the red and green signal values, and
將亮度分配給這四個色差訊號值。因此，較不易產生色分 離’較易以亮度/色差訊號進行色彩調整，可節省頻寬並提 高影像資料壓縮率’以及和傳統電視訊號相容。此外， YCbCr色彩空間可擴充至廣色域xvYCC色彩空間。 本發明之方法，或特定型態或其部份，可以以程式碼 的型態存在。程式碼可以包含於實體媒體，如軟碟、光碟 片、硬碟、或是任何其他機器可讀取（如電腦可讀取）儲 存媒體，其中，當程式碼被機器，如電腦載入且執行時， 此機器變成用以參與本發明之裝置。程式碼也可以透過一 些：送媒=如：線或電鐵、光纖、或是任何傳輸型態進 灯达/、中，當程式碼被機器，如電腦接收 行時’此機器變成用以參與本發明之裝置。載且執 處理單元實作時，程式碼結合處理單元提供：=用途 應用特定邏輯電路之獨特裝置。 、#作類似於 雖…、本發明已以較佳貫施例揭露如 陬中女级BH ,, 然其ji非用以 限疋本發明，任何熟習此技藝者，在 社个脱離本發明之精神 1380700 和範圍内，當可作各種之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。The brightness is assigned to these four color difference signal values. Therefore, color separation is less likely to be performed, and color adjustment by brightness/color difference signal is easier, which saves bandwidth and improves image data compression rate' and is compatible with conventional television signals. In addition, the YCbCr color space can be expanded to the wide color gamut xvYCC color space. The method of the invention, or a particular version or portion thereof, may exist in the form of a code. The code can be included in a physical medium such as a floppy disk, a CD, a hard disk, or any other machine readable (eg computer readable) storage medium in which the code is loaded and executed by a machine such as a computer. At this time, the machine becomes a device for participating in the present invention. The code can also be passed through some: media: such as: line or electric iron, fiber optic, or any transmission type into the lights, /, when the code is received by the machine, such as a computer, 'this machine becomes used to participate The device of the invention. When the processing unit is implemented and implemented, the code combination processing unit provides: = Use A unique device that applies a specific logic circuit. ,# is similar to the present invention, the present invention has been disclosed in a preferred embodiment, such as the female BH, but it is not limited to the present invention, and any one skilled in the art may deviate from the present invention. In the spirit of 1380700 and the scope of the invention, the scope of protection of the present invention is defined by the scope of the appended claims.
12 1380700 【圖式簡單說明】 第1圖係顯示本發明實施例之基於亮度/色差色彩空間 之分色技術之色序法的步驟流程圖。 第2圖係顯示本發明實施例之基於亮度/色差色彩空間 之分色技術之色序法的實施流程圖。 第3圖係顯示一輸入影像之RGB色彩空間轉換為 YCbCr色彩空間的示意圖。 第4圖係顯示本發明實施例之顯示裝置的架構示意 圖。 【主要元件符號說明】 511.. 514〜流程步驟 210.. 260〜實施流程 400〜顯示裝置 410〜影像輸入模組 430〜影像處理單元 450〜螢幕450 1312 1380700 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing the steps of the color sequential method based on the color separation technique of the luminance/chromatic aberration color space in the embodiment of the present invention. Fig. 2 is a flow chart showing the implementation of the color sequential method based on the color separation technique of the luminance/chromatic aberration color space in the embodiment of the present invention. Figure 3 is a schematic diagram showing the conversion of an RGB color space of an input image into a YCbCr color space. Fig. 4 is a block diagram showing the structure of a display device of an embodiment of the present invention. [Description of main component symbols] 511.. 514~ Flowchart 210.. 260~ Implementation flow 400~Display device 410~Image input module 430~Image processing unit 450~Screen 450 13