TW476222B - Device and method for the simultaneous processing of global/local pixel image quality enhancement - Google Patents
Device and method for the simultaneous processing of global/local pixel image quality enhancement Download PDFInfo
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476222 _I ^。:ϋ_ 五、發明說明(1) ---------------二」二ihi 本發明係有關於一種可同時處理全域及局部點位影像 品質增顯之裝置及其方法,尤指同時利用全域影像處理與 局部點位影像品質增顯處理的觀念,交互運用於一張影像 上,以達到提升影像細節之清晰度、亮度及對比品質之目 的。 由於數位影像處理技術之提昇以及應用日廣,許多不 同來源的影像均可透過計算機的數位化處理,以提供不同 之應用。利用計算機處理影像,最常用的方法是將感測器 所記錄的影像透過輸入裝置輸入計算機,該輸入裝置係將 影像轉換為數位化之格式,即影像中之各像素以紅、綠、 藍三原色之強度值代表,儲存於記憶體中;每一像素的紅 、綠、藍之強度值以2 5 6階來表示其内容,並提供各種 數位影像處理之用。 惟,在一般感測器所記錄的影像資料,卻與我們實際 上的視覺經驗存在著很大的差距。 在感測器前的景象,包含了亮與暗的部份,感測器依 據不同的曝光量調整以擷取不同的影像,一張影像經常會 同時存在著曝光不足的陰影部份與過度曝光的部份,不同 的曝光量調整,也只能將某些畫面整體區域的曝光調整至 平均的最佳值,卻必須犧牲了畫面某些局部部位的曝光品 質,如此對追求真實原影呈現之至高技術而言有莫大之負 面影響。 再者,感測器本身存在著硬體設計的問題,不同的硬 體設計,會具有不同的光譜波段的敏感度,在技術上,感476222 _I ^. : Ϋ_ V. Explanation of the invention (1) --------------- II "IIihi The present invention relates to a device capable of simultaneously processing global and local point image quality enhancement and its Method, especially using the concepts of global image processing and local point image quality enhancement processing at the same time, interactively applied to an image to achieve the purpose of improving the sharpness, brightness and contrast quality of image details. Due to the advancement of digital image processing technology and its wide application, many images from different sources can be digitized by computers to provide different applications. The most common method for processing images using a computer is to input the image recorded by the sensor into the computer through an input device. The input device converts the image into a digital format, that is, each pixel in the image is in three primary colors: red, green, and blue. The intensity value represents and is stored in the memory; the intensity value of each pixel's red, green, and blue represents its content in steps of 25.6, and provides various digital image processing purposes. However, the image data recorded by general sensors is far from our actual visual experience. The scene in front of the sensor contains light and dark parts. The sensor adjusts according to different exposures to capture different images. An image often has both underexposed shadows and overexposed. For different exposure adjustments, you can only adjust the exposure of the entire area of the frame to the average optimal value, but you must sacrifice the exposure quality of some parts of the frame. High technology has a huge negative impact. Furthermore, the sensor itself has a hardware design problem. Different hardware designs will have different sensitivities in the spectral bands. Technically, the sensor
第5頁 476222 五、發明說明(2) 測器只能依據使用者的 的敏感度。另外,數位 限制,還有量化上的限 處理的過程中,值域與 ,在某些亮度差異很大 像與原本大腦視覺存在 像處理中即被稱為動態 Compression)的問題( 在另一方面,感測 感測器焦距的調整,只 焦,造成了感測器所擷 某些部份卻因為景深的 情況,其失真之不良影 人類的視覺,主要 三度空間的搜尋局部區 晶狀體的對焦與曈孔光 像品質,都能符合視覺 所以,當相對於三 球,經過這樣的視覺模 色或者是亮度變化,總 清晰的細節内涵,尤其 的差異更是明顯易見。 按,習知數位影像 的技術,並無一套同時 ”修正 弋一‘:》一、. -^t^er 需求設計,在某個波段上具備最佳 感測器上的記錄單元除了值域上的 制,每個類比的訊號要經過數位化 量化的限制將使得訊號的精度流失 的狀況下,會使得所記錄的數位影 著明顯的差異,這個問題在數位影 值域壓縮(Dynamic RangePage 5 476222 V. Description of the invention (2) The detector can only be based on the sensitivity of the user. In addition, in the process of digital limit and quantization limit processing, the value range and, in some cases, the brightness is very different from that of the original brain vision image processing, which is called dynamic compression. The adjustment of the focal length of the sensing sensor, focusing only, caused some parts of the sensor to be captured, but because of the depth of field, the distortion of the image affected the human vision. The focus is mainly on the three-dimensional search of the local lens. The quality of the light image with the perforated hole can meet the vision. Therefore, when compared to the three balls, after such a visual mode color or brightness change, the overall clear details and connotations, especially the differences are more obvious. Press, Learn Digital Imaging technology does not have a set of "correction at the same time": "I ..-^ t ^ er requirements design, the recording unit with the best sensor on a certain band in addition to the range of the system, each The limitation of digital analog quantization of an analog signal will cause a loss of signal accuracy, which will cause a significant difference in the recorded digital. This problem is compressed in the digital shadow value range (Dyn amic Range
I 器所面對的是個三度空間的世界, 能針對晝面中的某個主題來進行對 取的影像上,某些部位是清晰的, 問題,而有了對焦不準產生模糊的 響更為明顯。 是主題式的搜尋方式,相對於每個 域所映入眼球的訊號,進行眼球中 量的調整,使得空間的每個點的取 經驗中的最佳值。 度空間的每一點訊號從影像進入眼 式,在大腦重建後的影像不論是顏 是比從感測器所記錄的影像具有較 是在陰影與強光的部份,兩者表現 處理用以解決上述感測器品質問題 解決曝光、對焦與動態值域壓縮問The device is facing a three-dimensional world. On the image that can be aligned for a certain theme in the daytime, some parts are clear and problematic, and the blurry noise caused by the inaccuracy of focus is even worse. As obvious. It is a subject-based search method, which adjusts the amount of eyeballs relative to the signal of the eyeballs reflected in each domain, so that each point in space takes the best value in experience. Each point of the signal in the degree space enters the eye type from the image. The image reconstructed in the brain, whether it is a face or a face, has more parts than the image recorded from the sensor in the shadow and strong light. The aforementioned sensor quality issues address exposure, focus, and dynamic range compression issues.
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習 始數位 影像處 素三原 正,該 像素中 全域修 只可 即使 因為量 對影像 達到整 影像處 B ) 極長, 係將感 並於計 將該原 (B ) 行全域 再對像 影像處 度與動 影像平 *^全域 均的調 同時提 (R ) 理之方 錄的原 設置一 像之像 進行修 著再對 素進行 理之後 的問題 少某些 法只針 仍無法 ,且該 )、藍 之時間 π數位影 影像之資 理系統, 色紅(R 修正係先 綠色素進 正,該數 部份改善 影像整體 化而流失 的整體特 張影像每 理系統於 之強度值 不符合效 像處理的 料傳入記 該影像處 )、綠( 將像素中 行全域修 位影像經 原始影像 亮度看起 的影像細 性為依據 個部份細 處理像素 時,係採 率之原則 憶體中, 理系統係 G )、藍 紅色素進 正,最後 此一數位 中曝光亮 來較原始 節;A然此 來產生平 節的品質 三原色紅 用依序處 測器所記 算單元中 始數位影 之強度值 修正,接 素中藍色 理系統處 態值域上 均,並減 修正之方 整效果· 升之要求 、綠(G 式,花費 目前最新之數位影像處理方法,係將該影像處理系統 中處理像素三原色紅(R )、綠(G )、藍(B )之強度 值的方法,由全域修正改為局部點位修正,在每一個原色 圖中,以每一區域為一單位進行全域修正,即於每一區域 =没定一焦點,配合該焦點做局部的相對處理,區域分的 <細,影像對比清晰度就愈高,但此一方法處理後之影像 ,其像素三原色經過分別處理,再組合成的顏色向量在顏 色座標空間中將會產生肉眼可明顯識別的偏差,而失去原 476222 90. !2· 1 8 工: 一.:、 .1 . ' :卜 ' ,. }丨: 五、發明說明 (4) “ -----------------—」 有視覺經驗中的顏色,故必需再引進一調整值進行顏色還 原調整的處理,才可儘可能符合在視覺經驗上的顏色類別 。同時其在進行局部點位修正時,亦採取分別在每張原色 圖上修正後再組合之方式,同樣需花費極長之運算時間來 完成一次的處理;且此一方式,僅僅採用一個對數的亮度 轉換模式,試圖來解決整體的曝光亮度與動態值域壓縮的 調整問題,顯而易見,對於某些曝光過度的影像部位,這 樣的處理並不能達到最佳的視覺調整。 為此,本發明發展了一套演算法,模擬視覺經驗法則 ,重新修正感測器所記錄的影像訊號,同時解決曝光、對 焦與動態值域壓縮的問題,以追求符合實際人眼視覺經驗 之至高境界。 因此如何建立一種有效的影像增顯處理裝置及方法, 不僅在影像增顯處理時不會造成像素三原色的顏色向量在 色彩座標空間中的偏差,同時處理之速度更快,影像更清 晰,兼顧動態值域壓縮、曝光與對焦的最佳調整,實為使 用者殷切盼望及本發明人欲行解決之困難點所在,而本發 明人經過長久之努力,研發出一種可同時處理全域及局部 點位影像增顯之裝置及其演算法,針對上述影像增顯處理 方法之缺失加以改進,同時解決曝光、對焦與動態值域壓 縮問題,達成使數位影像之品質更加優良之目的。爰是, 本發明之主要目的,在於提供一種可同時處理全域及局部 點位影像品質增顯之裝置及其方法,以增顯影像在暗處與 亮處的細節部分,藉此以提昇真實影像之品質。The beginning of the digital image is three primes. The global correction in this pixel can only be very long because the amount of the image has reached the entire image. Because of the amount of the image, the original (B) line is considered to be the same as that of the entire image. Simultaneously with the moving image leveling, the whole set of (R) is recorded at the same time as the adjustment of the whole world, and the image of the original setting is repaired and then the element is processed. There are fewer problems. Some methods are still impossible, and). Blue time π digital video image management system, color red (R correction is the first green pigment into the positive, the number of parts to improve the integration of the image and the loss of the overall special image, the intensity value of the system does not meet the effect The processed material is transferred to the place where the image is recorded), green (the image detail of the pixel in the pixel's global trimming image, and the original image brightness is based on the brightness of the original image. When the pixel is processed in detail, it is based on the principle of recovery. The system is G), the blue-red pigment is positive, and the exposure in this last digit is brighter than the original segment; A then produces the quality of the flat segment. The three primary colors are red. The intensity of the first digital shadow in the unit recorded by the detector is sequentially processed. Correction: The blue color processing system in the element is uniform in the range of the state, and the correction effect of the correction is reduced. The green (G type) costs the latest digital image processing method, which is processed in the image processing system. The method of the intensity values of the three primary colors of pixels (R), green (G), and blue (B) is changed from global correction to local point correction. In each primary color map, global correction is performed with each region as a unit. That is, in each area = no focus is determined, and the relative relative processing is performed in accordance with the focus. The smaller the area is, the higher the sharpness of the contrast of the image. However, the image processed by this method has the three primary colors of pixels processed separately. The color vector that is recombined will produce a deviation that can be clearly recognized by the naked eye in the color coordinate space, and loses the original 476222 90.! 2 · 1 8 labor: a.:, .1. ': 卜',.} 丨: V. Explanation of the invention (4) "---------------------" There is a color in visual experience, so it is necessary to introduce another adjustment value for color restoration adjustment. Can be as close as possible to the color category in the visual experience. At the same time When performing local point correction, it also adopts the method of correcting and combining on each primary color map separately, which also takes an extremely long calculation time to complete the processing once; and in this way, only a logarithmic brightness conversion is used Mode, trying to solve the overall adjustment of exposure brightness and dynamic range compression, it is obvious that for some overexposed image parts, such processing cannot achieve the best visual adjustment. To this end, the present invention develops a set Algorithms, simulating the rules of visual experience, re-correcting the image signals recorded by the sensor, and simultaneously solving the problems of exposure, focus, and dynamic range compression, in order to pursue the highest realm that conforms to the actual human visual experience. Therefore, how to establish an effective image enhancement processing device and method, not only will not cause the deviation of the color vector of the three primary colors of pixels in the color coordinate space during the image enhancement processing, but the processing speed will be faster, the image will be clearer, and the dynamics will be considered. The best adjustment of the range compression, exposure and focus is really the user ’s longing hope and the difficulties that the inventor wants to solve. The inventor has developed a method that can simultaneously process the global and local points. The image augmentation device and its algorithm are improved for the lack of the above image augmentation processing methods, while solving the problems of exposure, focus, and dynamic range compression to achieve the purpose of making digital image quality better. That is, the main object of the present invention is to provide a device and method capable of simultaneously processing global and local point image quality enhancement, so as to increase the detail of the image in dark and bright places, thereby enhancing the real image. Quality.
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五、發明說明(5) 月邱明之次要目# ’在於提供-種可η * 局°卩點伋影像增顯之裝置及Α 了同時處理全域及 ”的曝光狀態與整體的動態 :個影像部位調整 内容。 建到提升影像記錄 本發明之又一目的,在於提供一種可 ”:位影像增顯之裝置及其方法,$到】日:J理:域及 里逮度’致使可大幅節省訊號之處理時間。豕《 效丄U審?委員更能瞭解本發明之目的特徵及功 ,對= 貫施例,…所附之圖示及圖號說明 對本發明做一詳細說明,說明如后: 月 請參閱第1圖,為本發明一較佳實施例之構造方塊圖 丨如圖所示,本發明為一可同時處理全域及局部點位影像 增顯之裝置及其方法,其主要結構係包括有··一數值轉換 系統1 2 ,該數值轉換系統1 2係將輸入之原始影像i 〇 的數位影像像素三原色紅、綠、藍強度(I n t e n s i t y )值 轉換為以亮度(Illuminati〇n)及色彩座標表示之亮度數 值,並將該亮度數值轉換為對數平面之數值;反之,亦可V. Description of the invention (5) Qiu Mingming's secondary project # 'is to provide-a device that can increase and display the image of the point and point of view, and to simultaneously process the global and "exposure status and overall dynamics: an image The content of the site adjustment is built to improve the image recording. Another object of the present invention is to provide a device and method that can increase and display the image, from $ to [Day]: J: The domain and the degree of capture can lead to significant savings. Signal processing time. "Effective U trial? The members can better understand the purpose, features and functions of the present invention, and explain the present invention in detail through the following examples and illustrations. The explanation is as follows: Please refer to FIG. 1 for the first month. Structure block diagram of the preferred embodiment 丨 As shown in the figure, the present invention is a device and method capable of simultaneously processing global and local point image augmentation and display. Its main structure includes a numerical conversion system 1 2, The numerical conversion system 12 converts the three primary color red, green, and blue intensity values of the digital image pixels of the input original image i 〇 into luminance values represented by brightness (Illuminati) and color coordinates, and The brightness value is converted to a logarithmic plane value; conversely, it can also be
將一經過全域修正及局部點位修正之對數平面之數值轉換 為以亮度及色彩座標表示之亮度數值,再將該亮度數值轉 換為數位影像像素三原色之強度值。一影像處理系統1 4 ,其中包含一全域修正單元1 4 0及一局部點位修正單元 1 4 2,嗜全域修正單元1 4 〇係將取自該數值轉換系統 1 2之對數平面之數值進行全域修正,致使影像整體亮度 看起來較原始影像平均,並減少某些因為量化而流失的影A logarithmic plane value after global correction and local point correction is converted into a luminance value represented by luminance and color coordinates, and then the luminance value is converted into the intensity values of the three primary colors of the digital image pixels. An image processing system 14 includes a global correction unit 14 0 and a local point correction unit 14 2. The global correction unit 1 4 0 performs the calculation from the logarithmic plane of the numerical conversion system 12 Global correction, making the overall brightness of the image look more average than the original image, and reducing some lost images due to quantization
第9頁 五、發明說明 像細節。 換系統1 該對數平 進行全域 點做局部 就愈高; 2係為同 後轉送至 再將資料 處理後影 請參 圖;如圖 之強度值 彩座標表 轉換為對 面上之數 2 3,係 較原始影 另一為局部點 面之數值進行局 分為若干區域, 於每一區域中設 當然區域分的 正及該局部點位 部點位修正單 數平面之數值 值區分為若干 首先於每一區 處理,故區域 修正單元1 4 ’之後再將修 轉換系統1 2 素三原色之強 元1 4 2則將取自該數值轉 進行局部點位修正,亦即將 區域,以部一區域為一單位 域中設定一焦點,配合該焦 分的愈細,影像對比清晰度 0及局部點位修正單元1 ^ 正完之對數平面之數值合成 ’於該數值轉換系統1 2内 度值,如此即可得到較佳之 圖,為 首先輸 驟2 0 度數值 上之數 兩部份 點進行 ,並減 位修正 部點位 以每一 定一焦 愈細, 修正係Page 9 5. Description of the invention Like details. Change system 1 The higher the logarithmic level is, the higher the local point is, the higher it becomes; 2 is for the subsequent transfer to the data processing and the shadows please refer to the picture; the intensity value color coordinate table in the figure is converted to the opposite number 2 3, the system Compared with the original shadow, another value is a local point and surface. It is divided into several areas. In each area, the positive value of the regional division and the numerical value of the local correction point singular plane are divided into several areas. Zone processing, so after the area correction unit 1 4 ', the conversion system 12 will be repaired. The strong element of the three primary colors 1 4 2 will be taken from this value for local point correction, which is also the area, with the unit of the area as a unit. Set a focal point in the domain. With the finer of the focal point, the image contrast sharpness 0 and the local point correction unit 1 ^ the numerical synthesis of the positive logarithmic plane 'in the numerical conversion system 12 within the degree value, so you can To get a better picture, first enter the number of 20 points on the value of 20 degrees, and reduce the point of the correction part to make it finer with each focus. The correction system
(6) 而该局 2之對 面之數 修正。 的相對 該全域 步進行 該數值 轉為像 像1 6 閱第2 所示, ,如步 示之亮 數平面 值分為 以一焦 像平均 本發明 入數位 ;經一 ’如步 值,如 處理, 全域修 少某些 部分, 修正, 區域為 點’配 影像对 為同步 一較佳 影像像 色彩轉 驟2 1 步驟2 一為全 I ’使 因為量 如步驟 亦即將 —單位 合該焦 比清晰 進行, 實施例 素三原 換轉換 ;再經 2 ;接 域修正 影像整 化而流 2 4, 該對數 進行全 點做局 度就愈 之後再 影像處 色紅、 為以免 過一對 著將該 部分, 體亮度 失的影 係將該 平面之 域修正 部的相 高;該 將兩修 理流程 綠、藍 度及色 數轉換 對數平 如步驟 看起來 像細節 對數平 數值區 ’首先 對處理 全域修 正後之 _(6) The opposite number of Board 2 is corrected. Relative to the global step, the value is converted into an image like the one shown in Figure 2, as shown in Figure 2. As shown in the figure, the plane value of the number is divided into a focal image to average the number of the present invention; after a 'such as the step value, such as processing , Remove some parts in the whole area. Correct. The area is points. The image pair is synchronized. A better image is color. Step 2 1 Step 2 is full I ”so that the amount is as the steps are about to come—the unit and the focus ratio are clear. In the embodiment, the original three conversions are performed; then 2; the field correction image is normalized and streamed 2, and the logarithm is performed at the full point, and then the image is red, so as not to cross the part in a pair. , The volume loss of the film is the same as the field correction part of the plane; the two repair process of the green, blueness and color number conversion logarithmically as steps look like details logarithmic value area 'First after the global correction process Of _
476222476222
五、發明說明(7) 數值合成,如 及色彩座標表 數值經該色彩 之強度值,如 2 8 ;如此 當然,在 將該亮度數值 影像其精度損 請參閱第 正之處理流程 上之數值通過 2 4 2及低通 到三種取樣值 部點位影像品 低階信號與輸 0 及 2 4 4 0 分別通過異常 要是以一般正 ,再分別以W 加權2 4 4 4 後之數值做内 尺度調整2 4 數),致使完 步驟2 5 ,·再經由該對數鐘仏 一七> ☆ ▲ 丁数褥換轉換為以亮度 ,如步驟2 6 ;接著將該亮度 為數位影像像素三原色紅、、綠、藍 V = 7 ;最後再經由輸出影像輸出,如步 即元成整個影像處理作業之流程。 上述步驟2 2中亦可不經該對數轉換,直接 分為兩部份處理,惟於對數平面上處理數位 失較以亮度數值直接處理小。 3圖’為本發明一較佳實施例中局部點位修 方塊圖;如圖所示,首先對輸入該對數平面 不同之低通濾波(I )2 4 0、低通濾波) 濾波(E ) 2 4 4 ’亦即輸入一組信號可得 ’其主要是將該對數平面上之數值中,對巧 質增顯處理不需要之低階信號取出,並將該 入之對數平面之數值相減2400、242^ ,如此便可將該低階信號濾掉,再將其結果 過濾2402、2422及2442 ,其主 常之影像資料範圍為基準,除去異常之部分 1加權2404,W2加權2424及wg ’藉此凸顯某部分之特質,將經由加權凸顯 部合成2 4 6,合成之數值最後進行_τ· 8 (其中該7禕為一局部點位修正之尺度來 成之數值即為一局部點位修正之數值。 > 值得一提的是,本發明之主要精神(影像增顯處理系V. Description of the invention (7) Numerical synthesis, such as the value of the color coordinate table and the intensity value of the color, such as 2 8; so of course, for the accuracy loss of the brightness numerical image, please refer to the value on the positive processing flow. Pass 2 4 2 and low-pass to the three sample values of low-level signals and input 0 and 2 4 4 0 If the abnormality is generally positive, then W-weighted 2 4 4 4 is used to adjust the internal scale 2 4 number), so that step 2 5 is completed, and then through the logarithmic clock 仏 七 gt ▲ ▲ change the number of mattresses to the brightness, as in step 2 6; then the brightness is the digital image pixel three primary colors red, green And blue V = 7; finally, it is output through the output image, and the whole image processing operation flow is completed in one step. In the above step 22, it is also possible to directly divide into two parts without performing the logarithmic conversion, but processing the digits on the logarithmic plane has less loss than processing directly with the brightness value. Figure 3 is a block diagram of local point modification in a preferred embodiment of the present invention; as shown in the figure, the low-pass filtering (I) 2 4 0, low-pass filtering) input to the logarithmic plane is first filtered (E) 2 4 4 'that is, by inputting a set of signals', it is mainly to take out the low-order signals that are not needed for the quality enhancement display from the values on the logarithmic plane, and subtract the values from the logarithmic plane. 2400, 242 ^, so that the low-order signal can be filtered out, and then the results are filtered 2402, 2422, and 2442. The main image data range is used as the basis. Except for the abnormal part, the weight is 2404, and the weight is 2424 and wg. 'In order to highlight the characteristics of a part, 2 4 6 will be synthesized through the weighted highlights, and the synthesized value is finally _τ · 8 (where 7 祎 is a local point correction scale. The value formed is a local point. Bit correction value.> It is worth mentioning that the main spirit of the present invention (image enhancement processing system
476222 90.12. 18 年 :, 五、發明說明(8) 統)係可用如下之方程式表示 η476222 90.12. 18 years :, 5. Description of the invention (8) system) can be expressed by the following equation η
I rc ΊϊΤΓΤυ W: ·)) LPF^I) 其中I為輸入之亮度,I’為輸出之亮度;k為一常數 ;r為一全域修正之參數,r為一局部點位修正之尺度 參數,可自動調整或依使用者需要自行調整;w為一加權 參數,其總合為1; LPF為一低通濾波,。 因此,本發明中主要以局部點位修正搭配全域修正之 方式來處理影像,於處理影像之前先將數位影像像素三原 色之強度值轉換為以亮度及色彩座標表示之亮度數值,再 對該亮度數值進行對數轉換,將轉換後之對數平面上之數 值進行局部點位修正,而非個別以三原色之強度值進行點 位修正,且此同時亦進行全域修正,如此不僅可節省許多 時間,亦不需再進行其他修正之步驟,實為一優於習用技 術之發明。 綜上所述,本發明不僅可縮短工作之時間,且處理後 之影像更清晰,在亮度與對比上的品質更佳,亦不會有色 彩偏離之困擾,實為一具有新穎性、進步性及可供產業上 利用者,應符合我國專利法專利申請要件無疑,爰依法提 出發明專利申請,祈 鈞局早曰賜准專利,至為感禱。 惟以上所述者,僅為本發明之一較佳實施例而已,並 非用來限定本發明實施之範圍,舉凡依本發明申請專利範 圍所述之方法、構造、特徵及精神所為之均等變化與修飾I rc ΊϊΤΓΤυ W: ·)) LPF ^ I) where I is the brightness of the input and I 'is the brightness of the output; k is a constant; r is a parameter for global correction, and r is a scale parameter for local point correction. It can be adjusted automatically or according to the user's needs; w is a weighting parameter, which is 1 in total; LPF is a low-pass filter. Therefore, in the present invention, the image is mainly processed by local point correction and global correction. Before processing the image, the intensity values of the three primary colors of the digital image pixels are converted into brightness values expressed by brightness and color coordinates, and then the brightness values are converted. Logarithmic conversion, local point correction of the values on the logarithmic plane after the conversion, instead of individual point correction of the intensity values of the three primary colors, and global correction at the same time, which not only saves a lot of time, but also eliminates the need for It is an invention that is superior to the conventional technique to perform other correction steps. To sum up, the invention can not only shorten the working time, but also make the processed image clearer and better in terms of brightness and contrast, and it will not be plagued by color deviation. It is novel and progressive. And those who can be used in the industry should comply with the patent application requirements of China's patent law. No doubt, the invention patent application was submitted in accordance with the law. However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of implementation of the present invention. For example, all methods, structures, features, and spirits described in the scope of patent application for the present invention are equally changed and Embellish
第12頁 80. 12, ί 8. 476222 五、發明說明(9)Page 12 80. 12, ί 8. 476222 V. Description of the invention (9)
均 應 包括於 本 發 明 之 申請專利範 圍 内 〇 圖 號 簡 單說明 • 1 0 原 始 影 像 1 2 數 值 轉 換 系統 1 4 影 像 處 理 系 統 1 4 0 全 域 修 正 口口 一 早兀 1 4 2 局 部 點 位 修 正單元 1 6 處 理 後 影 像 2 0 入 影 像 2 1 色 彩 轉 換 2 2 對 數 轉 換 2 3 全 域 修 正 2 4 局 部 點 位 修 正 2 4 0 低 通 濾 波 (I ) 2 4 0 0 相 減 2 4 0 2 異 常 過 濾 2 4 0 4 W 1 加 權 2 4 2 低 通 濾 波 (Π ) 2 4 2 0 相 減 2 4 2 2 異 常 過 濾 2 4 2 4 W 2 加 權 2 4 4 低 通 遽 波 (Π ) 2 4 4 0 相 減 2 4 4 2 異 常 過 濾、 2 4 4 4 W 3 加 權 2 4 6 内 部 合 成 2 4 8 尺 度 調 整 2 5 出 影 像 第13頁 476222 π」All should be included in the scope of patent application of the present invention. 0 Brief description of drawing number • 1 0 Original image 1 2 Numerical conversion system 1 4 Image processing system 1 4 0 Global correction mouth early 1 4 2 Local point correction unit 1 6 Processed image 2 0 Into image 2 1 Color conversion 2 2 Logarithmic conversion 2 3 Global correction 2 4 Local point correction 2 4 0 Low-pass filtering (I) 2 4 0 0 Subtraction 2 4 0 2 Abnormal filtering 2 4 0 4 W 1 Weighted 2 4 2 Low-pass filtering (Π) 2 4 2 0 Subtraction 2 4 2 2 Abnormal filtering 2 4 2 4 W 2 Weighted 2 4 4 Low-pass chirp (Π) 2 4 4 0 Subtraction 2 4 4 2 Anomaly filtering, 2 4 4 4 W 3 Weighted 2 4 6 Internal synthesis 2 4 8 Scale adjustment 2 5 Out of the image Page 13 476222 π "
第14頁Page 14
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US8199257B2 (en) | 2008-10-31 | 2012-06-12 | Novatek Microelectronics Corp. | Video filter and video processor and processing method using the same |
CN113225486A (en) * | 2021-04-29 | 2021-08-06 | 深圳市阿达视高新技术有限公司 | Processing method, device, equipment and medium for shot picture |
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US8199257B2 (en) | 2008-10-31 | 2012-06-12 | Novatek Microelectronics Corp. | Video filter and video processor and processing method using the same |
CN113225486A (en) * | 2021-04-29 | 2021-08-06 | 深圳市阿达视高新技术有限公司 | Processing method, device, equipment and medium for shot picture |
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