TWI819754B - Low brightness image enhancement method, electronic chip and information processing device - Google Patents
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Abstract
本發明主要揭示一種低亮度圖像增強方法，係應用於一具有顯示器的電子裝置之中，且由該電子裝置的一電子晶片所執行，其中，該電子晶片之中整合有一伽馬變換單元用以執行一圖像增強處理從而將一輸入灰階數據轉換成一輸出灰階數據。本發明之低亮度圖像增強方法包括：找出所述圖像增強處理的一運算結束灰階值；設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益；以及利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。The present invention mainly discloses a low-brightness image enhancement method, which is applied in an electronic device with a display and is executed by an electronic chip of the electronic device, wherein the electronic chip integrates a gamma conversion unit for To perform an image enhancement process to convert an input grayscale data into an output grayscale data. The low-brightness image enhancement method of the present invention includes: finding an end-of-operation grayscale value of the image enhancement process; setting an image enhancement gain whose value gradually changes from 0 to the end-of-operation grayscale value; and Using the image enhancement gain and the operation end gray scale value, a low brightness image enhancement process is performed on a brightness data corresponding to the input gray scale data.
Description
本發明係關於影像數據處理的技術領域，尤指一種低亮度圖像增強方法。The invention relates to the technical field of image data processing, and in particular, to a low-brightness image enhancement method.
圖1顯示習知的一種平面顯示器的方塊圖。如圖1所示，習知的平面顯示器1a的架構係主要包括：一顯示面板11a(如OLED面板或LED面板)以及一顯示驅動電路12a，其中該顯示驅動電路12a包括一時序控制單元120a、一閘極(列)驅動單元121a以及一源極(行)驅動單元122a。熟悉平面顯示器之設計與製造的電子工程師都知道，習知技術經會令源極驅動單元122a同時包含一伽馬(Gamma)校正電路123a。所述伽馬校正電路123a通常包括一數位伽馬控制單元(Digital gamma control, DGC)與一伽馬電壓產生單元。FIG. 1 shows a block diagram of a conventional flat panel display. As shown in Figure 1, the architecture of a conventional flat panel display 1a mainly includes: a display panel 11a (such as an OLED panel or an LED panel) and a display driving circuit 12a, wherein the display driving circuit 12a includes a timing control unit 120a, A gate (column) driving unit 121a and a source (row) driving unit 122a. Electronic engineers who are familiar with the design and manufacture of flat-panel displays know that in conventional technology, the source driving unit 122a also includes a gamma correction circuit 123a. The gamma correction circuit 123a usually includes a digital gamma control unit (DGC) and a gamma voltage generating unit.
圖2為圖1所示之源極驅動單元122a與顯示面板11a的方塊圖。如圖2所示，該數位伽馬控制單元1231a通常係利用一程式語言編輯成一智慧財產(Intellectual property, IP)文件並嵌於該源極驅動單元122a所含有的記憶體內。另一方面，該伽馬電壓產生單元1232a則為一實體電路。FIG. 2 is a block diagram of the source driving unit 122a and the display panel 11a shown in FIG. 1 . As shown in FIG. 2 , the digital gamma control unit 1231a is usually edited into an intellectual property (IP) file using a programming language and embedded in the memory contained in the source driving unit 122a. On the other hand, the gamma voltage generating unit 1232a is a physical circuit.
在有必要進行伽馬變換時，該數位伽馬控制單元1231a會將包含紅色灰階數據Rin、綠色灰階數據Gin與藍色灰階數據Bin的一輸入顯示數據轉換成包含第一紅色灰階數據R1、第一綠色灰階數據G1與第一藍色灰階數據B1的一顯示數據。接著，該伽馬電壓產生單元1232a依據所述顯示數據產生一紅色畫素伽馬電壓GV R、一綠色畫素伽馬電壓GV G與一藍色畫素伽馬電壓GV B傳送至該源極驅動單元122a內部的一驅動電路124a，該驅動電路124a依據所述紅色畫素伽馬電壓GV R、所述綠色畫素伽馬電壓GV G與所述藍色畫素伽馬電壓GV B而產生一紅色畫素資料電壓DATA R、一綠色畫素資料電壓DATA G與一藍色畫素資料電壓DATA B。 When it is necessary to perform gamma conversion, the digital gamma control unit 1231a will convert an input display data including red grayscale data Rin, green grayscale data Gin and blue grayscale data Bin into a first red grayscale data. A display data of data R1, first green grayscale data G1 and first blue grayscale data B1. Then, the gamma voltage generating unit 1232a generates a red pixel gamma voltage GV R , a green pixel gamma voltage GV G and a blue pixel gamma voltage GV B according to the display data and sends them to the source. A driving circuit 124a inside the driving unit 122a. The driving circuit 124a generates a signal based on the red pixel gamma voltage GV R , the green pixel gamma voltage GV G and the blue pixel gamma voltage GV B A red pixel data voltage DATA R , a green pixel data voltage DATA G and a blue pixel data voltage DATA B.
更詳細地說明，該數位伽馬控制單元1231a(DGC)係利用以下式(a)～式(c)將所述輸入顯示數據轉換成所述顯示數據： ……………………(a) ……………………(b) ……………………(c) To explain in more detail, the digital gamma control unit 1231a (DGC) uses the following formulas (a) to (c) to convert the input display data into the display data: ……………………(a) ……………………(b) ……………………(c)
於上述式(a)～式(c)之中，Rin、Gin和Bin分別為上位機所傳送的輸入顯示數據所包含的輸入紅色灰階數據、輸入綠色灰階數據與輸入藍色灰階數據。另一方面，R MAX為紅色畫素的預設最高灰階值，G MAX為綠色畫素的預設最高灰階值，且B MAX為藍色畫素的預設最高灰階值。舉例而言，R MAX為255，G MAX為230，且B MAX為204。並且，Rout、Gout和Bout分別為所述顯示數據所含有的紅色灰階數據、綠色灰階數據與藍色灰階數據。請參閱圖3，其顯示原始的紅色灰階數據、綠色灰階數據與藍色灰階數據相對於顯示器亮度的曲線圖。進一步地，在經過數位伽馬控制(DGC)處理之後，圖4顯示處理後的紅色灰階數據、綠色灰階數據與藍色灰階數據相對於顯示器亮度的曲線圖。 In the above formulas (a) to (c), Rin, Gin and Bin are respectively the input red grayscale data, the input green grayscale data and the input blue grayscale data included in the input display data sent by the host computer. . On the other hand, R MAX is the default highest gray level value of the red pixel, G MAX is the default highest gray level value of the green pixel, and B MAX is the default highest gray level value of the blue pixel. For example, R MAX is 255, G MAX is 230, and B MAX is 204. Moreover, Rout, Gout and Bout are respectively red grayscale data, green grayscale data and blue grayscale data contained in the display data. Please refer to Figure 3, which shows a graph of original red grayscale data, green grayscale data, and blue grayscale data versus display brightness. Further, after digital gamma control (DGC) processing, FIG. 4 shows a graph of the processed red grayscale data, green grayscale data, and blue grayscale data relative to the brightness of the display.
實務經驗指出，習知技術的數位伽馬控制單元1231a所進行的DGC處理無法兼顧低灰階圖像和高灰階圖像的優質顯示效果。因此，現有技術在該伽馬校正電路123a之中進一步設置一個伽馬變換單元，所述伽馬變換單元也是一種數位伽馬控制(DGC)技術。具體而言，該伽馬變換單元對利用冪次變換(power transformation、或稱伽馬變換)方法對該數位伽馬控制單元1231a所產生紅色灰階數據Rout、綠色灰階數據Gout和藍色灰階數據Bout進行修正，從而實現增強圖像(Sunlight readable enhancement, SRE)的效果，改善了圖像的顯示品質。具體而言，該伽馬映射單元係利用下式(d)將R/G/B伽馬曲線轉換成輸出R/G/B伽馬曲線所述顯示數據： ……………………(d) Practical experience points out that the DGC processing performed by the digital gamma control unit 1231a of the prior art cannot take into account the high-quality display effects of low-grayscale images and high-grayscale images. Therefore, in the prior art, a gamma conversion unit is further provided in the gamma correction circuit 123a, and the gamma conversion unit is also a digital gamma control (DGC) technology. Specifically, the gamma transformation unit uses a power transformation (power transformation, or gamma transformation) method to perform red grayscale data Rout, green grayscale data Gout and blue grayscale data generated by the digital gamma control unit 1231a. The first-order data Bout is corrected to achieve the effect of enhancing the image (Sunlight readable enhancement, SRE) and improving the display quality of the image. Specifically, the gamma mapping unit uses the following formula (d) to convert the R/G/B gamma curve into the display data described in the output R/G/B gamma curve: ……………………(d)
於上式(d)中，Gray_in為前述之Rout、Gout和Bout，可稱為輸入灰階值。相對地，Gray_out為所述Rout、Gout和Bout的映射值，可稱為輸出灰階值。再者，c、γ為常數。圖5顯示輸入灰階值和輸出灰階值的映射(轉換)曲線圖。In the above formula (d), Gray_in is the aforementioned Rout, Gout and Bout, which can be called the input grayscale value. In contrast, Gray_out is the mapping value of Rout, Gout and Bout, which can be called the output grayscale value. Furthermore, c and γ are constants. Figure 5 shows the mapping (conversion) curve of the input grayscale value and the output grayscale value.
然而，實務經驗顯示，即使利用所述伽馬映射單元執行冪次變換(或稱伽馬變換)方法，但是在低灰階圖像和高灰階圖像的圖像增強效果仍舊有待改進。更詳細地說明，當平面顯示器1a的整體畫面偏亮時(即，操作在高亮度顯示)，低灰階圖像會有較好的穿透率，但是高灰階圖像則會偏白，色飽和度和層次感損失較嚴重。另一方面，當平面顯示器1a的整體畫面偏暗時(即，操作在低亮度顯示)，高灰階圖像會有較好的層次感，但是低灰階圖像的畫面暗區的細節則無法清楚顯現。However, practical experience shows that even if the gamma mapping unit is used to perform a power transformation (or gamma transformation) method, the image enhancement effect on low grayscale images and high grayscale images still needs to be improved. To explain in more detail, when the overall screen of the flat-panel display 1a is bright (that is, operating in high-brightness display), the low-grayscale image will have better transmittance, but the high-grayscale image will be white. The loss of color saturation and layering is serious. On the other hand, when the overall picture of the flat-panel display 1a is dark (that is, the display is operated at low brightness), the high-grayscale image will have a better sense of layering, but the details of the dark areas of the low-grayscale image will be poor. cannot be clearly seen.
由上述說明可知，本領域亟需一種低亮度圖像增強方法。From the above description, it can be seen that a low-brightness image enhancement method is urgently needed in this field.
本發明之主要目的在於提供一種低亮度圖像增強方法，係應用於一具有顯示器的電子裝置之中，且由該電子裝置的一電子晶片所執行，其中，該電子晶片之中整合有一伽馬變換單元用以執行一增強圖像處理從而將一輸入灰階數據轉換成一輸出灰階數據。本發明之低亮度圖像增強方法由該電子晶片所執行，從而進一步地對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。The main purpose of the present invention is to provide a low-brightness image enhancement method, which is applied to an electronic device with a display and executed by an electronic chip of the electronic device, wherein a gamma is integrated into the electronic chip. The transformation unit is used to perform an enhanced image processing to convert an input grayscale data into an output grayscale data. The low-brightness image enhancement method of the present invention is executed by the electronic chip, thereby further performing a low-brightness image enhancement process on a brightness data corresponding to the input grayscale data.
簡單地說，本發明通過在現有技術的數位伽馬控制(DGC)的技術基礎上，針對低灰階數據的亮度進行增強計算，從而重新配置亮度數據來實現低灰階畫素的亮度增強。Simply put, the present invention performs enhancement calculations on the brightness of low grayscale data based on the prior art Digital Gamma Control (DGC) technology, thereby reconfiguring the brightness data to achieve brightness enhancement of low grayscale pixels.
為達成上述目的，本發明提出所述低亮度圖像增強方法的一實施例，其係應用於一具有顯示器的電子裝置之中，且由該電子裝置的一電子晶片所執行；其中，該電子晶片之中整合有一伽馬變換單元用以執行一圖像增強處理從而將一輸入灰階數據轉換成一輸出灰階數據，且該低亮度圖像增強方法包括： 找出所述圖像增強處理的一運算結束灰階值； 設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益；以及 利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。 To achieve the above object, the present invention proposes an embodiment of the low-brightness image enhancement method, which is applied in an electronic device with a display and executed by an electronic chip of the electronic device; wherein, the electronic device A gamma conversion unit is integrated into the chip to perform an image enhancement process to convert an input grayscale data into an output grayscale data, and the low-brightness image enhancement method includes: Find the grayscale value at the end of an operation of the image enhancement process; Set an image enhancement gain whose value gradually changes with the grayscale value from 0 to the end of the operation; and Using the image enhancement gain and the operation end gray scale value, a low brightness image enhancement process is performed on a brightness data corresponding to the input gray scale data.
在一實施例中，該電子晶片執行一低亮度圖像增強函式以實現所述低亮度圖像增強處理，且該低亮度圖像增強函式包含如下數學式(1)： LT ............... (1)； 其中，LT用以表示經過所述低亮度圖像增強處理之亮度數據，EP為所述運算結束灰階值，Gray_n為介於0和所述運算結束灰階值之間的該輸入灰階數據，SRE_Gain為對應Gray_n的該圖像增強增益的值，且Curve為Gray_n在由該輸入灰階數據和該輸出灰階數據所構成的一灰階數據轉換曲線上的曲率(curvature)。 In one embodiment, the electronic chip executes a low-brightness image enhancement function to implement the low-brightness image enhancement process, and the low-brightness image enhancement function includes the following mathematical formula (1): LT ............. (1); Among them, LT is used to represent the brightness data after the low-brightness image enhancement process, EP is the grayscale value at the end of the operation, and Gray_n is The input grayscale data is between 0 and the grayscale value at the end of the operation, SRE_Gain is the value of the image enhancement gain corresponding to Gray_n, and Curve is the input grayscale data and the output grayscale data of Gray_n. The curvature on the gray-scale data conversion curve formed.
在一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於0至0.99之間。In an embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between 0 and 0.99.
在一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於-0.99至0之間。In an embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between -0.99 and 0.
本發明同時提供一種電子晶片，其係應用於一具有顯示器的電子裝置之中，其中，該電子晶片之中整合有一伽馬變換單元用以執行一圖像增強處理從而將一輸入灰階數據轉換成一輸出灰階數據，且該電子晶片還執行一低亮度圖像增強方法，以對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理；該低亮度圖像增強方法包括： 找出所述圖像增強處理的一運算結束灰階值； 設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益；以及 利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。 The present invention also provides an electronic chip, which is used in an electronic device with a display, wherein the electronic chip integrates a gamma conversion unit to perform an image enhancement process to convert an input grayscale data. into an output grayscale data, and the electronic chip also performs a low-brightness image enhancement method to perform a low-brightness image enhancement process on a brightness data corresponding to the input gray-scale data; the low-brightness image enhancement method includes : Find the grayscale value at the end of an operation of the image enhancement process; Set an image enhancement gain whose value gradually changes with the grayscale value from 0 to the end of the operation; and Using the image enhancement gain and the operation end gray scale value, a low brightness image enhancement process is performed on a brightness data corresponding to the input gray scale data.
在一實施例中，該電子晶片執行一低亮度圖像增強函式以實現所述低亮度圖像增強處理，且該低亮度圖像增強函式包含如下數學式(1)： LT ............... (1)； 其中，LT用以表示經過所述低亮度圖像增強處理之亮度數據，EP為所述運算結束灰階值，Gray_n為介於0和所述運算結束灰階值之間的該輸入灰階數據，SRE_Gain為對應Gray_n的該圖像增強增益的值，且Curve為Gray_n在由該輸入灰階數據和該輸出灰階數據所構成的一灰階數據轉換曲線上的曲率(curvature)。 In one embodiment, the electronic chip executes a low-brightness image enhancement function to implement the low-brightness image enhancement process, and the low-brightness image enhancement function includes the following mathematical formula (1): LT ............. (1); Among them, LT is used to represent the brightness data that has been processed by the low-brightness image enhancement process, EP is the grayscale value at the end of the operation, and Gray_n is The input grayscale data is between 0 and the grayscale value at the end of the operation, SRE_Gain is the value of the image enhancement gain corresponding to Gray_n, and Curve is the input grayscale data and the output grayscale data of Gray_n. The curvature on the gray-scale data conversion curve formed.
在一實施例中，所述電子晶片為選自於由顯示驅動晶片、顯示驅動和觸控整合(Touch and Display Driver Integration, TDDI)晶片和影像處理晶片所組成群組之中的任一者。In one embodiment, the electronic chip is any one selected from the group consisting of a display driver chip, a display driver and touch integration (Touch and Display Driver Integration, TDDI) chip, and an image processing chip.
在一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於0至0.99之間。In an embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between 0 and 0.99.
在一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於-0.99至0之間。In an embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between -0.99 and 0.
並且，本發明還提供一種資訊處理裝置，其特徵在於具有如前所述本發明之電子晶片。Furthermore, the present invention also provides an information processing device, which is characterized by having the electronic chip of the present invention as described above.
在一實施例中，該資訊處理裝置為選自於由平面顯示裝置、頭戴式顯示裝置、投影裝置、數位相機、車載娛樂系統、智慧型電視、智慧型手機、智慧型手錶、平板電腦、桌上型電腦、筆記型電腦、一體式電腦、金融交易裝置、和門禁裝置所組成群組之中的一種電子裝置。In one embodiment, the information processing device is selected from a flat display device, a head-mounted display device, a projection device, a digital camera, a car entertainment system, a smart TV, a smart phone, a smart watch, a tablet computer, An electronic device among the group consisting of desktop computers, notebook computers, all-in-one computers, financial transaction devices, and access control devices.
為使 貴審查委員能進一步瞭解本發明之結構、特徵、目的、與其優點，茲附以圖式及較佳具體實施例之詳細說明如後。In order to enable the review committee to further understand the structure, characteristics, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are attached below.
圖6顯示應用本發明之一種低亮度圖像增強方法的一電子裝置的方塊圖。由圖6可知，該電子裝置1為包含一顯示器11與一處理器12，且該顯示器11包含一顯示面板111與用以執行顯示驅動的一電子晶片112。特別地，本發明之低亮度圖像增強方法係利用一程式語言編輯成一演算法文件從而儲存在該電子晶片112的一記憶體之中，從而成為嵌在該電子晶片112之中的一低亮度圖像增強單元113。特別說明的是，本發明之一種低亮度圖像增強方法可以應用在任何一種具有顯示器11的電子裝置1，包括但不限於：平面顯示裝置、頭戴式顯示裝置、投影裝置、數位相機、車載娛樂系統、智慧型電視、智慧型手機、智慧型手錶、平板電腦、桌上型電腦、筆記型電腦、一體式電腦、金融交易裝置、和門禁裝置。 FIG. 6 shows a block diagram of an electronic device applying a low-brightness image enhancement method of the present invention. As can be seen from FIG. 6 , the electronic device 1 includes a display 11 and a processor 12 , and the display 11 includes a display panel 111 and an electronic chip 112 for executing display driving. In particular, the low-brightness image enhancement method of the present invention is edited into an algorithm file using a programming language and stored in a memory of the electronic chip 112, thereby becoming a low-brightness image embedded in the electronic chip 112. Image enhancement unit 113. In particular, the low-brightness image enhancement method of the present invention can be applied to any electronic device 1 with a display 11, including but not limited to: flat display devices, head-mounted display devices, projection devices, digital cameras, vehicle-mounted display devices, etc. Entertainment systems, smart TVs, smart phones, smart watches, tablets, desktop computers, notebook computers, all-in-one computers, financial transaction devices, and access control devices.
如圖6所示，本發明之一種低亮度圖像增強方法以一低亮度圖像增強單元113的形式應用於具有顯示器11的電子裝置1之中，且由該電子裝置1的一電子晶片112所執行。更詳細地說明，該電子晶片112之中整合有一伽馬變換單元用以執行一圖像增強(Sunlight readable enhancement,SRE)處理從而將一輸入灰階數據Gray_in轉換成一輸出灰階數據Gray_out。所述輸入灰階數據Gray_in和所述輸出灰階數據Gray_out的轉換曲線可參考圖5。進一步地，電子晶片112還可執行本發明之低亮度圖像增強方法，從而進一步地對該輸入灰階數據Gray_in所對應的一亮度數據進行一低亮度圖像增強處理。簡單地說，本發明之方法係通過在現有技術的數位伽馬控制(DGC)的技術基礎上，針對低灰階數據的亮度進行增強計算，從而重新配置亮度數據來實現低灰階畫素的亮度增強。As shown in FIG. 6 , a low-brightness image enhancement method of the present invention is applied in an electronic device 1 with a display 11 in the form of a low-brightness image enhancement unit 113 , and is made of an electronic chip 112 of the electronic device 1 executed. To explain in more detail, the electronic chip 112 integrates a gamma conversion unit to perform an image enhancement (Sunlight readable enhancement, SRE) process to convert an input grayscale data Gray_in into an output grayscale data Gray_out. The conversion curves of the input grayscale data Gray_in and the output grayscale data Gray_out can be referred to FIG. 5 . Furthermore, the electronic chip 112 can also execute the low-brightness image enhancement method of the present invention, thereby further performing a low-brightness image enhancement process on a brightness data corresponding to the input grayscale data Gray_in. Simply put, the method of the present invention is based on the existing digital gamma control (DGC) technology to perform enhanced calculations on the brightness of low grayscale data, thereby reconfiguring the brightness data to achieve low grayscale pixels. Brightness enhanced.
圖7為本發明之一種低亮度圖像增強方法的流程圖。如圖6所示，在該電子晶片112利用其伽馬變換單元執行一圖像增強處理從而將一輸入灰階數據Gary_in轉換成一輸出灰階數據Gary_uot(轉換曲線如圖5所示)之後，該電子晶片112可以接著啟用該低亮度圖像增強單元113(即，執行本發明之低亮度圖像增強方法)。如圖7所示，在方法流程的步驟S1中，係先找出所述圖像增強處理的一運算結束灰階值。舉例而言，如圖5之中所標示者，所述運算結束灰階值EP=192。接著，在方法流程的步驟S2中，係設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益。以圖5中的轉換曲線6為例，由於轉換曲線6的曲率(curvature)係隨著0至所述運算結束灰階值(EP=192)漸變，因此本發明亦設定所述運算結束灰階值隨著0至所述運算結束灰階值(EP=192)漸變。從而，若以Gray_n表示介於0和所述運算結束灰階值之間的輸入灰階數據Gray_in，則可以SRE_Gain為對應Gray_n的該圖像增強增益的值。換句話說，每個Gray_n會有其對應的SRE_Gain。Figure 7 is a flow chart of a low-brightness image enhancement method according to the present invention. As shown in Figure 6, after the electronic chip 112 uses its gamma conversion unit to perform an image enhancement process to convert an input grayscale data Gary_in into an output grayscale data Gary_uot (the conversion curve is shown in Figure 5), the The electronic chip 112 can then enable the low-brightness image enhancement unit 113 (ie, perform the low-brightness image enhancement method of the present invention). As shown in FIG. 7 , in step S1 of the method flow, a grayscale value at the end of the operation of the image enhancement processing is first found. For example, as shown in Figure 5 , the operation ends with a grayscale value EP=192. Next, in step S2 of the method flow, an image enhancement gain whose value gradually changes from 0 to the grayscale value at the end of the operation is set. Taking the conversion curve 6 in Figure 5 as an example, since the curvature of the conversion curve 6 gradually changes from 0 to the gray scale value at the end of the operation (EP=192), the present invention also sets the gray scale at the end of the operation. The value gradually changes from 0 to the grayscale value at the end of the operation (EP=192). Therefore, if Gray_n represents the input grayscale data Gray_in between 0 and the grayscale value at the end of the operation, SRE_Gain can be the value of the image enhancement gain corresponding to Gray_n. In other words, each Gray_n will have its corresponding SRE_Gain.
最終，在方法流程的步驟S3中，係利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。具體而言，該電子晶片112執行一低亮度圖像增強函式以實現所述低亮度圖像增強處理，且該低亮度圖像增強函式包含如下數學式(1)： LT .................. (1) Finally, in step S3 of the method flow, the image enhancement gain and the operation end gray scale value are used to perform a low brightness image enhancement process on a brightness data corresponding to the input gray scale data. Specifically, the electronic chip 112 executes a low-brightness image enhancement function to implement the low-brightness image enhancement process, and the low-brightness image enhancement function includes the following mathematical formula (1): LT .................. (1)
在上式(1)中，LT用以表示經過所述低亮度圖像增強處理之亮度數據，EP為所述運算結束灰階值，Gray_n為介於0和所述運算結束灰階值之間的該輸入灰階數據，SRE_Gain為對應Gray_n的該圖像增強增益的值，且Curve為Gray_n在由該輸入灰階數據和該輸出灰階數據所構成的一灰階數據轉換曲線(如圖5所示，轉換曲線1～6)上的曲率(curvature)。在一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於0至0.99之間。並且，在另一實施例中，對該亮度數據執行正向的所述低亮度圖像增強處理時，所述圖像增強增益(SRE_Gain)的值介於-0.99至0之間。In the above formula (1), LT is used to represent the brightness data that has been processed by the low-brightness image enhancement process, EP is the grayscale value at the end of the operation, and Gray_n is between 0 and the grayscale value at the end of the operation. The input gray-scale data, SRE_Gain is the value of the image enhancement gain corresponding to Gray_n, and Curve is the gray-scale data conversion curve of Gray_n composed of the input gray-scale data and the output gray-scale data (as shown in Figure 5 As shown, the curvature on the conversion curves 1 to 6). In an embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between 0 and 0.99. And, in another embodiment, when performing the forward low-brightness image enhancement process on the brightness data, the value of the image enhancement gain (SRE_Gain) is between -0.99 and 0.
圖8為輸入灰階數據相對於完成所述低亮度圖像增強處理之亮度數據的第一曲線圖。具體而言，在令上式(1)之中的Curve=1的情況下，利用式(1)完成對於圖5所示之轉換曲線1～6的運算後，即獲得圖8之中的數據曲線1～6。值得注意的是，對應最低灰階值的亮度(LT)會獲得最大的增強補償，原因在於式(1)之中的Curve-(SRE_Gain×(EP-Gray_n)/EP)在最低灰階值(即，Gray_n = 0)會變成1－SRE_Gain×((192－0)/192)= 1－(SRE_Gain*1)。相反地，對應最高灰階值的亮度(LT)會獲得最小的增強補償，原因在於式(1)之中的Curve-(SRE_Gain×(EP-Gray_n)/EP)在最高灰階值(即，Gray_n = 192)會變成1－SRE_Gain×((192－192)/192)= 1－(SRE_Gain*0)。FIG. 8 is a first graph of input grayscale data relative to brightness data after completing the low-brightness image enhancement process. Specifically, when Curve=1 in the above equation (1), after using equation (1) to complete the calculation of the conversion curves 1 to 6 shown in Figure 5, the data in Figure 8 is obtained. Curves 1 to 6. It is worth noting that the brightness (LT) corresponding to the lowest gray level value will obtain the largest enhancement compensation. The reason is that Curve-(SRE_Gain×(EP-Gray_n)/EP) in equation (1) is at the lowest gray level value ( That is, Gray_n = 0) will become 1-SRE_Gain×((192-0)/192)= 1-(SRE_Gain*1). On the contrary, the brightness (LT) corresponding to the highest gray level value will obtain the smallest enhancement compensation, because Curve-(SRE_Gain×(EP-Gray_n)/EP) in equation (1) is at the highest gray level value (i.e., Gray_n = 192) will become 1-SRE_Gain×((192-192)/192)= 1-(SRE_Gain*0).
進一步地，圖9為輸入灰階數據相對於完成所述低亮度圖像增強處理之亮度數據的第二曲線圖。具體而言，圖9和圖8都是利用 上式(1)完成對於圖5所示之轉換曲線1～6的運算之後所獲得。不同的是，圖9係設定運算精度在小數點0位，而圖8則設定運算精度在小數點2位。因此，在比較圖8與圖9的數據曲線之後，可以明顯看出圖8的數據曲線顯示出高度的平滑度。換句話說，提高運算精度有助於增加增強處理後的亮度(LT)的數據曲線之平滑度。Further, FIG. 9 is a second graph of the input grayscale data relative to the brightness data that completes the low-brightness image enhancement process. Specifically, both Figures 9 and 8 are obtained by using the above equation (1) to complete the calculation of the conversion curves 1 to 6 shown in Figure 5. The difference is that Figure 9 sets the calculation accuracy to 0 decimal places, while Figure 8 sets the calculation accuracy to 2 decimal places. Therefore, after comparing the data curves of Figure 8 and Figure 9, it can be clearly seen that the data curve of Figure 8 shows a high degree of smoothness. In other words, improving the calculation accuracy helps to increase the smoothness of the data curve of the enhanced luminance (LT).
如此，上述已完整且清楚地說明本發明之低亮度圖像增強方法；並且，經由上述可得知本發明具有下列優點：In this way, the low-brightness image enhancement method of the present invention has been completely and clearly explained above; and, from the above, it can be known that the present invention has the following advantages:
(1)本發明揭示一種低亮度圖像增強方法，係應用於一具有顯示器的電子裝置之中，且由該電子裝置的一電子晶片所執行，其中，該電子晶片之中整合有一伽馬變換單元用以執行一增強圖像處理從而將一輸入灰階數據轉換成一輸出灰階數據。本發明之低亮度圖像增強方法由該電子晶片所執行，從而進一步地對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。簡單地說，本發明通過在現有技術的數位伽馬控制(DGC)的技術基礎上，針對低灰階數據的亮度進行增強計算，從而重新配置亮度數據來實現低灰階畫素的亮度增強。(1) The present invention discloses a low-brightness image enhancement method, which is applied to an electronic device with a display and is executed by an electronic chip of the electronic device, wherein the electronic chip integrates a gamma transform The unit is used to perform an enhanced image processing to convert an input grayscale data into an output grayscale data. The low-brightness image enhancement method of the present invention is executed by the electronic chip, thereby further performing a low-brightness image enhancement process on a brightness data corresponding to the input grayscale data. Simply put, the present invention performs enhancement calculations on the brightness of low grayscale data based on the prior art Digital Gamma Control (DGC) technology, thereby reconfiguring the brightness data to achieve brightness enhancement of low grayscale pixels.
(2)本發明同時提供一種電子晶片，其係應用於一具有顯示器的電子裝置之中，其中，該電子晶片之中整合有一伽馬變換單元用以執行一圖像增強處理從而將一輸入灰階數據轉換成一輸出灰階數據；其特徵在於，該電子晶片還執行本發明之低亮度圖像增強方法，以對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理。(2) The present invention also provides an electronic chip, which is used in an electronic device with a display, wherein the electronic chip integrates a gamma conversion unit to perform an image enhancement process to convert an input grayscale The gray-scale data is converted into output gray-scale data; it is characterized in that the electronic chip also executes the low-brightness image enhancement method of the present invention to perform a low-brightness image enhancement process on a brightness data corresponding to the input gray-scale data.
(3)並且，本發明還提供一種種資訊處理裝置，其特徵在於具有如前所述本發明之電子晶片。在一實施例中，該資訊處理裝置為選自於由平面顯示裝置、頭戴式顯示裝置、投影裝置、數位相機、車載娛樂系統、智慧型電視、智慧型手機、智慧型手錶、平板電腦、桌上型電腦、筆記型電腦、一體式電腦、金融交易裝置、和門禁裝置所組成群組之中的一種電子裝置。(3) Furthermore, the present invention also provides an information processing device, characterized by having the electronic chip of the present invention as described above. In one embodiment, the information processing device is selected from a flat display device, a head-mounted display device, a projection device, a digital camera, a car entertainment system, a smart TV, a smart phone, a smart watch, a tablet computer, An electronic device among the group consisting of desktop computers, notebook computers, all-in-one computers, financial transaction devices, and access control devices.
必須加以強調的是，前述本案所揭示者乃為較佳實施例，舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者，俱不脫本案之專利權範疇。It must be emphasized that the foregoing disclosed in this case are preferred embodiments. Any partial changes or modifications derived from the technical ideas of this case and easily inferred by those familiar with the art do not deviate from the patent of this case. category of rights.
綜上所陳，本案無論目的、手段與功效，皆顯示其迥異於習知技術，且其首先發明合於實用，確實符合發明之專利要件，懇請 貴審查委員明察，並早日賜予專利俾嘉惠社會，是為至禱。To sum up, regardless of the purpose, means and effects of this case, it shows that it is completely different from the conventional technology, and that the invention is practical first, and indeed meets the patent requirements for inventions. I sincerely ask the review committee to take a clear look and grant the patent as soon as possible for your benefit. Society is a prayer for the Supreme Being.
1a:平面顯示器 11a:顯示面板 12a:顯示驅動電路 120a:時序控制單元 121a:閘極驅動單元 122a:源極驅動單元 123a:伽馬校正電路 1231a:數位伽馬控制單元 1232a:伽馬電壓產生單元 1:電子裝置 11:顯示器 111:顯示面板 112:電子晶片 113:低亮度圖像增強 S1:低找出所述圖像增強處理的一運算結束灰階值 S2:設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益 S3:利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理 1a: Flat screen display 11a:Display panel 12a:Display drive circuit 120a: Timing control unit 121a: Gate drive unit 122a: Source driver unit 123a: Gamma correction circuit 1231a: Digital gamma control unit 1232a: Gamma voltage generating unit 1: Electronic devices 11:Display 111:Display panel 112: Electronic chip 113: Low brightness image enhancement S1: Find the grayscale value at the end of an operation of the image enhancement process S2: Set an image enhancement gain whose value gradually changes with the grayscale value from 0 to the end of the operation. S3: Use the image enhancement gain and the operation end grayscale value to perform a low brightness image enhancement process on a brightness data corresponding to the input grayscale data.
圖1為習知的一種平面顯示器的方塊圖； 圖2為圖1所示之源極驅動單元與顯示面板的方塊圖； 圖3為原始的紅色灰階數據、綠色灰階數據與藍色灰階數據相對於顯示器亮度的曲線圖； 圖4為處理後的紅色灰階數據、綠色灰階數據與藍色灰階數據相對於顯示器亮度的曲線圖； 圖5為輸入灰階數據和輸出灰階數據的轉換曲線圖； 圖6為應用本發明之一種低亮度圖像增強方法的一電子裝置的方塊圖； 圖7為本發明之一種低亮度圖像增強方法的流程圖； 圖8為輸入灰階數據相對於完成所述低亮度圖像增強處理之亮度數據的第一曲線圖；以及 圖9為輸入灰階數據相對於完成所述低亮度圖像增強處理之亮度數據的第二曲線圖。 Figure 1 is a block diagram of a conventional flat panel display; Figure 2 is a block diagram of the source driving unit and display panel shown in Figure 1; Figure 3 is a graph of the original red grayscale data, green grayscale data and blue grayscale data relative to the brightness of the display; Figure 4 is a graph of the processed red grayscale data, green grayscale data and blue grayscale data relative to the brightness of the display; Figure 5 is a conversion curve diagram of input grayscale data and output grayscale data; Figure 6 is a block diagram of an electronic device applying a low-brightness image enhancement method of the present invention; Figure 7 is a flow chart of a low-brightness image enhancement method of the present invention; Figure 8 is a first graph of input grayscale data relative to brightness data that completes the low-brightness image enhancement process; and FIG. 9 is a second graph of the input grayscale data relative to the brightness data after completing the low-brightness image enhancement process.
S1:低找出所述圖像增強處理的一運算結束灰階值 S1: Find the grayscale value at the end of an operation of the image enhancement process
S2:設定其值隨著0至所述運算結束灰階值漸變的一圖像增強增益 S2: Set an image enhancement gain whose value gradually changes with the grayscale value from 0 to the end of the operation.
S3:利用所述圖像增強增益和所述運算結束灰階值對該輸入灰階數據所對應的一亮度數據進行一低亮度圖像增強處理 S3: Use the image enhancement gain and the operation end grayscale value to perform a low brightness image enhancement process on a brightness data corresponding to the input grayscale data.
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Citations (5)
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|---|---|---|---|---|
| TW200627336A (en) * | 2005-01-25 | 2006-08-01 | Samsung Electronics Co Ltd | Gamma correction device, display apparatus including the same, and method of gamma correction therein |
| CN101667416A (en) * | 2008-09-05 | 2010-03-10 | 深圳Tcl新技术有限公司 | Method for adjusting and analyzing color temperature and GAMMA of display |
| CN102903329A (en) * | 2012-10-12 | 2013-01-30 | 西安诺瓦电子科技有限公司 | Light emitting diode (LED) display screen brightness regulating method without loss of low gray scale |
| US20180102091A1 (en) * | 2016-03-31 | 2018-04-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Method of eliminating oled display panel mura |
| US20220139298A1 (en) * | 2020-10-30 | 2022-05-05 | Samsung Display Co., Ltd. | Display device and method of driving the same |
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|---|---|---|---|---|
| TW200627336A (en) * | 2005-01-25 | 2006-08-01 | Samsung Electronics Co Ltd | Gamma correction device, display apparatus including the same, and method of gamma correction therein |
| CN101667416A (en) * | 2008-09-05 | 2010-03-10 | 深圳Tcl新技术有限公司 | Method for adjusting and analyzing color temperature and GAMMA of display |
| CN102903329A (en) * | 2012-10-12 | 2013-01-30 | 西安诺瓦电子科技有限公司 | Light emitting diode (LED) display screen brightness regulating method without loss of low gray scale |
| US20180102091A1 (en) * | 2016-03-31 | 2018-04-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Method of eliminating oled display panel mura |
| US20220139298A1 (en) * | 2020-10-30 | 2022-05-05 | Samsung Display Co., Ltd. | Display device and method of driving the same |
| CN114530116A (en) * | 2020-10-30 | 2022-05-24 | 三星显示有限公司 | Display device |
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| TW202410016A (en) | 2024-03-01 |
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