TWI537667B - Image capturing device and auto-focus method thereof - Google Patents
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本發明是有關於一種影像擷取裝置及其自動對焦方法，且特別是一種具有複數個不同視角之相機的影像擷取裝置及其自動對焦方法。 The present invention relates to an image capturing device and an autofocus method thereof, and more particularly to an image capturing device having a plurality of cameras of different viewing angles and an autofocusing method thereof.
隨著相機對焦技術的不斷發展，相機對焦的方式已由最初的手動對焦發展到現在的自動對焦。一般而言，習知數位相機的自動對焦方式主要有對比度檢測(Contrast Detection)對焦和相位檢測(Phase Detection)對焦兩種。以對比度檢測對焦來說，其工作原理主要是，計算相機於不同對焦距離時所生成之複數個影像的對比度，並由複數個對比度中尋找一最高對比度，將最高對比度所對應的對焦距離設為相機的最佳對焦距離，以完成自動對焦。 As camera focus technology continues to evolve, the way the camera focuses has evolved from the initial manual focus to the current autofocus. In general, the autofocus methods of the conventional digital camera mainly include Contrast Detection focus and Phase Detection focus. In contrast detection focus, the working principle is mainly to calculate the contrast of a plurality of images generated by the camera at different focusing distances, and to find a highest contrast from a plurality of contrasts, and set the focus distance corresponding to the highest contrast to The camera's best focus distance to complete autofocus.
另一方面，相位檢測對焦的工作原理是，相位對焦偵測器將一光束分光分為兩個光束，並將其兩光束分別投影至相位對焦偵測器的兩個光感應單元上獲得一組光感應訊號，利用此組光感應訊號獲得相位差異資訊來判斷對焦的方向與距離，以完成自動對焦。 On the other hand, the phase detection focus works by the phase focus detector splitting a beam into two beams and projecting the two beams onto the two light sensing units of the phase focus detector to obtain a set. The light sensing signal uses the set of light sensing signals to obtain phase difference information to determine the direction and distance of the focus to complete the auto focus.
由於對比度檢測對焦的工作原理是根據相機於不同對焦距離時所產生的影像的對比度變化，因此在尋找鏡頭的最佳對焦距離的過程中，採用對比度檢測對焦的相機於對焦時需不斷地比較複數個影像的對比度，才能決定相機的最佳對焦距離。如此，相較 於採用相位檢測對焦之相機，採用對比度檢測對焦的相機需花費較多的時間來完成對焦。 Since the contrast detection focus works according to the contrast change of the image produced by the camera at different focus distances, in the process of finding the best focus distance of the lens, the camera with contrast detection focus needs to constantly compare the plural when focusing. The contrast of the images determines the optimal focus distance of the camera. So compared For cameras that use phase-detection focus, cameras that use contrast-detection focus take more time to focus.
值得注意的是，利用相位檢測對焦的相機，因其複數個相位對焦偵測器中的光感應單元並不適合作為產生影像的一部分像素，因此若相機內所設置之對焦用的複數個相位對焦偵測器的數量過多，將會影響相機拍攝場景所獲得之影像的品質，亦即獲得的影像可能會有較大的失真。 It is worth noting that the camera that uses phase detection focus is not suitable as a part of the pixels that generate the image because the light sensing unit in its multiple phase focus detectors is not used as a part of the image. If the number of detectors is too large, it will affect the quality of the image obtained by the camera shooting scene, that is, the obtained image may have large distortion.
本發明實施例提供一種影像擷取裝置，所述影像擷取裝置包括第一影像擷取模組、第二影像擷取模組及對焦與影像處理模組。第一影像擷取模組包括第一鏡頭模組、第一影像感測器及第一對焦裝置。第一影像感測器對應第一鏡頭模組而設置，且具有複數個第一相位對焦偵測器與複數個第一影像感測像素，以分別產生複數個第一組光感應訊號與第一影像。第一對焦裝置連接第一鏡頭模組，並用以調整第一鏡頭模組的位置。第二影像擷取模組包括第二鏡頭模組、第二影像感測器及第二對焦裝置。第二鏡頭模組的視角小於第一鏡頭模組的視角。第二影像感測器對應於第二鏡頭模組而設置，且具有複數個第二相位對焦偵測器與複數個第二影像感測像素，以分別產生複數個第二組光感應訊號與第二影像。第二對焦裝置連接第二鏡頭模組，並用以調整第二鏡頭模組的位置。對焦與影像處理模組電性連接第一影像擷取模組及第二影像擷取模組，其用以選取複數個第一組光感應訊號的其中之一，以對應產生第一對焦訊號至第一對焦裝置與第二對焦裝置，第一對焦裝置及第二對焦裝置根據第一對焦訊號分別調整其第一鏡頭模組與第二鏡頭模組的對焦位置，抑或對焦與影像處理模組用以選取複數個第二組光感應訊號的其中之一，以對應產生第二對焦訊號至第一對焦裝置與第二對焦裝置，第一對焦裝置及 第二對焦裝置根據第二對焦訊號分別調整其第一鏡頭模組與第二鏡頭模組的位置。 An image capturing device includes a first image capturing module, a second image capturing module, and a focusing and image processing module. The first image capturing module includes a first lens module, a first image sensor, and a first focusing device. The first image sensor is disposed corresponding to the first lens module, and has a plurality of first phase focus detectors and a plurality of first image sensing pixels to respectively generate a plurality of first group of light sensing signals and a first image. The first focusing device is coupled to the first lens module and configured to adjust the position of the first lens module. The second image capturing module includes a second lens module, a second image sensor, and a second focusing device. The viewing angle of the second lens module is smaller than the viewing angle of the first lens module. The second image sensor is disposed corresponding to the second lens module, and has a plurality of second phase focus detectors and a plurality of second image sensing pixels to respectively generate a plurality of second groups of light sensing signals and Two images. The second focusing device is coupled to the second lens module and configured to adjust the position of the second lens module. The focusing and image processing module is electrically connected to the first image capturing module and the second image capturing module, and is configured to select one of the plurality of first group of light sensing signals to generate a first focusing signal to The first focusing device and the second focusing device, the first focusing device and the second focusing device respectively adjust the focusing positions of the first lens module and the second lens module according to the first focusing signal, or the focusing and image processing module Selecting one of the plurality of second group of optical sensing signals to generate a second focusing signal to the first focusing device and the second focusing device, the first focusing device and The second focusing device adjusts the positions of the first lens module and the second lens module according to the second focus signal.
本發明實施例提供一種自動對焦方法，適用於影像擷取裝置，並且所述自動對焦方法步驟如下。複數個第一相位對焦偵測器產生複數個第一組光感應訊號，對焦與影像處理模組選取複數個第一組光感應訊號的其中之一，以產生第一對焦訊號，以及第一影像擷取模組與第二影像擷取模組根據第一對焦訊號調整各自的對焦距離。 The embodiment of the invention provides an autofocus method, which is suitable for an image capturing device, and the steps of the autofocus method are as follows. The plurality of first phase focus detectors generate a plurality of first group of optical sensing signals, and the focusing and image processing module selects one of the plurality of first group of optical sensing signals to generate the first focusing signal and the first image The capture module and the second image capture module adjust respective focus distances according to the first focus signal.
綜上所述，本發明實施例提供了一種具有複數個不同視角的影像擷取模組的影像擷取裝置及其自動對焦方法，因此，當對焦與影像處理模組選取其中一組光感應訊號時，對焦與影像處理模組會處理此組光感應訊號以產生對應的對焦訊號。如此，所述複數個影像擷取模組可依據所述對焦訊號調整其對焦距離，以完成自動對焦。 In summary, an embodiment of the present invention provides an image capturing device having an image capturing module of a plurality of different viewing angles and an autofocusing method thereof. Therefore, when the focusing and image processing module selects one of the optical sensing signals, The focus and image processing module processes the set of light sensing signals to generate corresponding focus signals. In this way, the plurality of image capturing modules can adjust the focusing distance according to the focusing signal to complete the auto focusing.
請參閱以下有關本發明的詳細說明、圖式，其進一步地描述本發明實施例所要解決的技術問題、所採取的技術手段與所達成的效果。此領域具有通常知識者可由下述內容得以深入且具體地瞭解本發明。另外，本發明所檢附的圖式僅提供參考與說明使用，其並非用來限制本發明。 Please refer to the following detailed description and drawings of the present invention, which further describe the technical problems to be solved by the embodiments of the present invention, the technical means taken, and the effect achieved. Those skilled in the art can have an in-depth and specific understanding of the present invention from the following. In addition, the drawings attached to the present invention are provided for reference and description only, and are not intended to limit the invention.
10‧‧‧影像擷取裝置 10‧‧‧Image capture device
11‧‧‧第一影像擷取模組 11‧‧‧First image capture module
12‧‧‧第二影像擷取模組 12‧‧‧Second image capture module
13‧‧‧對焦與影像處理模組 13‧‧‧Focus and Image Processing Module
111‧‧‧第一鏡頭模組 111‧‧‧First lens module
112、512‧‧‧第一影像感測器 112, 512‧‧‧ first image sensor
113‧‧‧第一對焦裝置 113‧‧‧First focusing device
121‧‧‧第二鏡頭模組 121‧‧‧Second lens module
122‧‧‧第二影像感測器 122‧‧‧Second image sensor
123‧‧‧第二對焦裝置 123‧‧‧Second focusing device
1121‧‧‧第一相位對焦偵測器 1121‧‧‧First phase focus detector
1221‧‧‧第二相位對焦偵測器 1221‧‧‧Second phase focus detector
1131‧‧‧第一對焦驅動電路 1131‧‧‧First focus drive circuit
1132‧‧‧第一對焦致動器 1132‧‧‧First focus actuator
1231‧‧‧第二對焦驅動電路 1231‧‧‧Second focus drive circuit
1232‧‧‧第二對焦致動器 1232‧‧‧Second focus actuator
A、B、C‧‧‧方框 A, B, C‧‧‧ boxes
R1、R2‧‧‧對焦區域 R1, R2‧‧‧ focus area
f1‧‧‧第一對焦訊號 F1‧‧‧first focus signal
f2‧‧‧第二對焦訊號 F2‧‧‧second focus signal
i1‧‧‧第一影像 I1‧‧‧ first image
i2‧‧‧第二影像 I2‧‧‧second image
P‧‧‧智慧型手機 P‧‧‧Smart Phone
p11‧‧‧第一光感應訊號 P11‧‧‧First light sensing signal
p12‧‧‧第二光感應訊號 P12‧‧‧Second light sensing signal
p21‧‧‧第三光感應訊號 P21‧‧‧ Third light sensing signal
p22‧‧‧第四光感應訊號 P22‧‧‧fourth optical sensing signal
S1‧‧‧第一區域 S1‧‧‧ first area
S2‧‧‧第二區域 S2‧‧‧Second area
S601、S602、S603、S604、S605、S606、S607、S608‧‧‧步驟 Steps S601, S602, S603, S604, S605, S606, S607, S608‧‧
圖1為根據本發明實施例之影像擷取裝置之方塊示意圖。 FIG. 1 is a block diagram of an image capture device according to an embodiment of the invention.
圖2為根據本發明實施例之第一影像感測器之示意圖。 2 is a schematic diagram of a first image sensor in accordance with an embodiment of the present invention.
圖3為根據本發明實施例之第二影像感測器之示意圖。 3 is a schematic diagram of a second image sensor in accordance with an embodiment of the present invention.
圖4為根據本發明實施例之影像擷取裝置之使用示意圖。 4 is a schematic diagram of the use of an image capture device according to an embodiment of the invention.
圖5為根據本發明另一實施例之第一影像感測器之示意圖。 FIG. 5 is a schematic diagram of a first image sensor according to another embodiment of the invention.
圖6為根據本發明實施例之自動對焦方法之流程圖。 6 is a flow chart of an autofocus method in accordance with an embodiment of the present invention.
在下文將參看隨附圖式更充分地描述各種例示性實施例，在隨附圖式中展示一些例示性實施例。然而，本發明概念可能以許多不同形式來體現，且不應解釋為限於本文中所闡述之例示性實施例。確切而言，提供此等例示性實施例使得本發明將為詳盡且完整，且將向熟習此項技術者充分傳達本發明概念的範疇。在諸圖式中，可為了清楚而誇示層及區之大小及相對大小。類似數字始終指示類似元件。 Various illustrative embodiments are described more fully hereinafter with reference to the accompanying drawings. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the illustrative embodiments set forth herein. Rather, these exemplary embodiments are provided so that this invention will be in the In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Similar numbers always indicate similar components.
應理解，雖然本文中可能使用術語第一、第二、第三等來描述各種元件，但此等元件不應受此等術語限制。此等術語乃用以區分一元件與另一元件。因此，下文論述之第一元件可稱為第二元件而不偏離本發明概念之教示。如本文中所使用，術語「及/或」包括相關聯之列出項目中之任一者及一或多者之所有組合。 It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, such elements are not limited by the terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the inventive concept. As used herein, the term "and/or" includes any of the associated listed items and all combinations of one or more.
請參照圖1，圖1為根據本發明實施例之影像擷取裝置之方塊示意圖。如圖1所示，影像擷取裝置10包括第一影像擷取模組11、第二影像擷取模組12及對焦與影像處理模組13。對焦與影像處理模組13電性連接第一影像擷取模組11與第二影像擷取模組12。第一影像擷取模組11及第二影像擷取模組12分別具有複數個影像感測像素與複數個相位對焦偵測器。複數個影像感測像素用以根據被拍攝場景產生多個感測訊號，且此多個感測訊號可形成第一影像i1及第二影像i2。第一影像擷取模組11與第二影像擷取模組12的各個相位對焦偵測器皆具有兩個光感應單元，用以根據被拍攝場景分別產生第一光感應訊號p11、第二光感應訊號p12、第三光感應訊號p21及第四光感應訊號p22，其中第一光感應訊號p11及第二光感應訊號p12為用以產生第一相位差異訊號的第一組光感應訊號，以及第三光感應訊號p21及第四光感應訊號p22為用以產生第二相位差異訊號的第二組光感應訊號。對焦與影像處 理裝置13用以接收由第一影像擷取模組11及第二影像擷取模組12所生成之第一影像i1及第二影像i2，以生成融合影像，並且對焦與影像處理裝置13利用複數個第一組光感應訊號的其中之一獲得第一相位差異訊號或利用複數個第二組光感應訊號的其中之一獲得第二相位差異訊號，以對應產生第一對焦訊號f1或第二對焦訊號f2。 Please refer to FIG. 1. FIG. 1 is a block diagram of an image capturing device according to an embodiment of the invention. As shown in FIG. 1 , the image capturing device 10 includes a first image capturing module 11 , a second image capturing module 12 , and a focusing and image processing module 13 . The focus and image processing module 13 is electrically connected to the first image capturing module 11 and the second image capturing module 12 . The first image capturing module 11 and the second image capturing module 12 respectively have a plurality of image sensing pixels and a plurality of phase focus detectors. The plurality of image sensing pixels are configured to generate a plurality of sensing signals according to the captured scene, and the plurality of sensing signals can form the first image i1 and the second image i2. Each of the phase inversion detectors of the first image capturing module 11 and the second image capturing module 12 has two light sensing units for generating a first light sensing signal p11 and a second light according to the captured scene. The first optical sensing signal p11 and the second optical sensing signal p12 are the first group of optical sensing signals for generating the first phase difference signal, and the first optical sensing signal p11 and the fourth optical sensing signal p22. The third optical sensing signal p21 and the fourth optical sensing signal p22 are second optical sensing signals for generating a second phase difference signal. Focus and image The processing device 13 is configured to receive the first image i1 and the second image i2 generated by the first image capturing module 11 and the second image capturing module 12 to generate a fused image, and the focusing and image processing device 13 utilizes One of the plurality of first sets of optical sensing signals obtains a first phase difference signal or obtains a second phase difference signal by using one of the plurality of second group of optical sensing signals to generate a first focus signal f1 or a second Focus signal f2.
於本發明實施例中，第一影像擷取模組11拍攝場景的視角大於第二影像擷取模組12的視角，亦即相對於第二影像擷取模組12，第一影像擷取模組11為一個廣角的相機。複數個相位對焦偵測器分別設置於第一影像擷取模組11的第一影像感測器112中以及第二影像擷取模組12的第二影像感測器122中。對焦與影像處理模組13利用其中一組光感應訊號獲得對應的相位差異訊號，並據此產生對焦訊號。因此，第一影像擷取模組11與第二影像擷取模組12可以使用同一個對焦訊號來進行對焦。 In the embodiment of the present invention, the first image capturing module 11 captures a scene having a larger viewing angle than the second image capturing module 12, that is, the second image capturing module 12, and the first image capturing module. Group 11 is a wide-angle camera. The plurality of phase focus detectors are respectively disposed in the first image sensor 112 of the first image capturing module 11 and the second image sensor 122 of the second image capturing module 12 . The focus and image processing module 13 obtains a corresponding phase difference signal by using one of the light sensing signals, and generates a focus signal accordingly. Therefore, the first image capturing module 11 and the second image capturing module 12 can use the same focusing signal to perform focusing.
舉例來說，複數個對焦偵測器可設置於第一影像感測器112與第二影像感測器122中。使用者在使用影像擷取裝置10拍攝場景時，會選取場景的其中之一處作為對焦目標，因此對應地，對應於該處之第一影像擷取模組11或第二影像擷取模組12的其中一個相位對焦偵測器所產生的一組光感應訊號會被選取，對焦與影像處理模組13利用此組光感應訊號產生相位差異訊號，並據此產生對焦訊號，以使得第一影像擷取模組11與第二影像擷取模組12使用此對焦訊號來進行對焦。 For example, a plurality of focus detectors can be disposed in the first image sensor 112 and the second image sensor 122. When the image capturing device 10 is used to capture a scene, the user selects one of the scenes as the focus target, and accordingly, corresponding to the first image capturing module 11 or the second image capturing module. A set of photo-sensing signals generated by one of the phase focus detectors of 12 is selected, and the focus and image processing module 13 uses the set of photo-sensing signals to generate a phase difference signal, and accordingly generates a focus signal to make the first The image capturing module 11 and the second image capturing module 12 use the focusing signal to perform focusing.
更進一步地說，若多個第一組光感應訊號的其中之一被選取時，對焦與影像處理模組13利用此第一組光感應訊號產生第一相位差異訊號，並據此產生第一對焦訊號f1，以使得第一影像擷取模組11與第二影像擷取模組12使用第一對焦訊號f1來進行對焦。若多個第二組光感應訊號的其中之一被選取時，對焦與影像處理模組13利用此第二組光感應訊號產生第二相位差異訊號，並 據此產生第二對焦訊號f2，以使得第一影像擷取模組11與第二影像擷取模組12使用第二對焦訊號f2來進行對焦。 Further, if one of the plurality of first group of optical sensing signals is selected, the focusing and image processing module 13 generates the first phase difference signal by using the first group of optical sensing signals, and generates a first The focus signal f1 is used to cause the first image capturing module 11 and the second image capturing module 12 to focus using the first focus signal f1. If one of the plurality of second sets of optical sensing signals is selected, the focusing and image processing module 13 generates the second phase difference signal by using the second set of optical sensing signals, and The second focus signal f2 is generated to enable the first image capture module 11 and the second image capture module 12 to focus using the second focus signal f2.
在此請注意，當第一影像擷取模組11使用第二對焦訊號f2進行對焦後所獲得的第一影像i1於對焦區域的對比度未達特定門限值或並非為最大對比度時，則第一影像擷取模組11可選擇性地改用對比度檢測對焦來取得最佳的對焦距離。當第二影像擷取模組12使用第一對焦訊號f1進行對焦後所獲得的第二影像i2於對焦區域的對比度未達特定門限值或並非為最大對比度時，則第二影像擷取模組12可選擇性地改用對比度檢測對焦來取得最佳的對焦距離。另外一方面，上述對焦與影像處理模組13可以是一種數位訊號處理電路，可由多個電晶體構成，或由微控制器搭配適當的韌體來實現，或者可以是透過CPU基於軟體來實現的軟體模組，總之本發明實施例並不限定於此。 Please note that when the contrast of the first image i1 obtained by the first image capturing module 11 after focusing using the second focus signal f2 is less than a specific threshold or not the maximum contrast, the first The image capture module 11 can selectively use contrast detection focus to achieve an optimal focus distance. The second image capturing module is used when the contrast of the second image i2 obtained by the second image capturing module 12 after focusing using the first focusing signal f1 is less than a specific threshold or not the maximum contrast. 12 Optionally use contrast detection focus to achieve the best focus distance. On the other hand, the focus and image processing module 13 can be a digital signal processing circuit, which can be composed of a plurality of transistors, or can be implemented by a microcontroller with an appropriate firmware, or can be implemented by a CPU based on a software. The software module is not limited to the embodiment of the present invention.
接著，更進一步地描述第一影像擷取模組11的細節。第一影像擷取模組11包括第一鏡頭模組111、第一影像感測器112及第一對焦裝置113，其中第一影像感測器112對應於第一鏡頭模組111而設置。第一影像感測器112電性連接對焦與影像處理模組13，第一對焦裝置113連接第一鏡頭模組111，且第一對焦裝置113電性連接對焦與影像處理模組13。 Next, the details of the first image capturing module 11 are further described. The first image capturing module 11 includes a first lens module 111 , a first image sensor 112 , and a first focusing device 113 . The first image sensor 112 is disposed corresponding to the first lens module 111 . The first image sensor 112 is electrically connected to the focus and image processing module 13 , and the first focusing device 113 is connected to the first lens module 111 , and the first focusing device 113 is electrically connected to the focusing and image processing module 13 .
在本實施例中，所述第一鏡頭模組111為透鏡組，用以將欲拍攝之場景成像於第一影像感測器112上。第一影像感測器112具有上述之複數個影像感測像素與複數個第一相位對焦偵測器，例如為互補金屬氧化物半導體(CMCS)感測器。 In this embodiment, the first lens module 111 is a lens group for imaging a scene to be captured on the first image sensor 112. The first image sensor 112 has the above plurality of image sensing pixels and a plurality of first phase focus detectors, such as a complementary metal oxide semiconductor (CMCS) sensor.
第一對焦裝置113具有第一對焦驅動電路1131與第一對焦致動器1132，其中第一對焦驅動電路1131電性連接對焦與影像處理模組13。第一對焦驅動電路1131用以接收第一對焦訊號f1或第二對焦訊號f2，以驅動第一對焦致動器1132調整第一鏡頭模組111的位置，而改變第一影像擷取模組11的對焦距離，其中第一對焦 致動器1132例如為音圈馬達(Voice Coil Motor，簡稱VCM)，但本發明並不限制致動器的種類。 The first focus device 113 has a first focus drive circuit 1131 and a first focus actuator 1132 , wherein the first focus drive circuit 1131 is electrically connected to the focus and image processing module 13 . The first focus driving circuit 1131 is configured to receive the first focus signal f1 or the second focus signal f2 to drive the first focus actuator 1132 to adjust the position of the first lens module 111, and change the first image capturing module 11 Focusing distance, where the first focus The actuator 1132 is, for example, a voice coil motor (VCM), but the invention does not limit the type of the actuator.
接著，更進一步地描述第二影像擷取模組12的細節。第二影像擷取模組12包括第二鏡頭模組121、第二影像感測器122及第二對焦裝置123，其中第二影像感測器122對應於第二鏡頭模組121而設置。第二影像感測器122電性連接對焦與影像處理模組13，第二對焦裝置123連接第二鏡頭模組121，且第二對焦裝置123電性連接對焦與影像處理模組13。 Next, the details of the second image capturing module 12 are further described. The second image capturing module 12 includes a second lens module 121 , a second image sensor 122 , and a second focusing device 123 . The second image sensor 122 is disposed corresponding to the second lens module 121 . The second image sensor 122 is electrically connected to the focus and image processing module 13 , the second focusing device 123 is connected to the second lens module 121 , and the second focusing device 123 is electrically connected to the focus and image processing module 13 .
在本實施例中，所述第二鏡頭模組121為透鏡組，用以將欲拍攝之場景成像於第二影像感測器122上。如前言所述，在本實施例中，第二鏡頭模組121之焦距大於第一鏡頭模組111之焦距，亦即第二鏡頭模組121之視角小於第一鏡頭模組111之視角。另外，第二影像感測器122具有上述之複數個影像感測像素與複數個第二相位對焦偵測器，例如為互補金屬氧化物半導體感測器。 In this embodiment, the second lens module 121 is a lens group for imaging a scene to be captured on the second image sensor 122. As described in the foregoing, in the present embodiment, the focal length of the second lens module 121 is greater than the focal length of the first lens module 111, that is, the viewing angle of the second lens module 121 is smaller than the viewing angle of the first lens module 111. In addition, the second image sensor 122 has the above plurality of image sensing pixels and a plurality of second phase focus detectors, such as complementary metal oxide semiconductor sensors.
第二對焦裝置123具有第二對焦驅動電路1231與第二對焦致動器1232，其中第二對焦驅動電路1231電性連接對焦與影像處理模組13。第二對焦驅動電路1231用以接收第一對焦訊號f1或第二對焦訊號f2，以驅動第二對焦致動器1232調整第二鏡頭模組121的位置，而改變第二影像擷取模組12的對焦距離，其中第二對焦致動器1232例如為音圈馬達，但本發明並不限制致動器的種類。 The second focus device 123 has a second focus drive circuit 1231 and a second focus actuator 1232 , wherein the second focus drive circuit 1231 is electrically connected to the focus and image processing module 13 . The second focus driving circuit 1231 is configured to receive the first focus signal f1 or the second focus signal f2 to drive the second focus actuator 1232 to adjust the position of the second lens module 121, and change the second image capturing module 12 The focus distance, wherein the second focus actuator 1232 is, for example, a voice coil motor, but the invention does not limit the type of actuator.
值得一提的是，第一對焦驅動電路1131及第二對焦驅動電路1231例如為具有多個電晶體的電壓轉換電路，用以根據第一對焦訊號f1或第二對焦訊號f2產生相應的驅動電壓或電流給各自對應的對焦致動器，而所述電壓轉換電路可以依據致動器的種類或精確度的需求而設計。 It is to be noted that the first focus drive circuit 1131 and the second focus drive circuit 1231 are, for example, voltage conversion circuits having a plurality of transistors for generating corresponding driving voltages according to the first focus signal f1 or the second focus signal f2. Or current is given to the respective focus actuators, and the voltage conversion circuit can be designed according to the type or accuracy of the actuator.
在第一影像感測器112及第二影像感測器122分別將第一影像i1及第二影像i2傳送給對焦與影像處理模組13後，對焦與影像 處理模組13可依據第一影像i1及第二影像i2來產生一融合影像作為預覽影像。若預覽影像中的其中一個對焦區域被選定進行對焦，則對應對焦區域的一相位對焦偵測器所產生的該組光感應訊號也會跟著被選取，亦即對焦與影像處理模組13依據所述對焦區域選取多個第一組光感應訊號的其中之一或多個第二組光感應訊號的其中之一。接著，對焦與影像處理模組13依據所選取的第一組光感應訊號或第二組光感應訊號產生相位差異訊號，並且對焦與影像處理模組13依據所選取的相位差異訊號產生對焦訊號，以使第一影像擷取模組11與第二影像擷取模組12可以共用同一個對焦訊號(第一對焦訊號f1或第二對焦訊號f2)執行自動對焦程序。 After the first image sensor 112 and the second image sensor 122 respectively transmit the first image i1 and the second image i2 to the focus and image processing module 13, the focus and the image are respectively The processing module 13 can generate a fused image as a preview image according to the first image i1 and the second image i2. If one of the focus areas in the preview image is selected for focusing, the set of light sensing signals generated by the one-phase focus detector corresponding to the focus area is also selected, that is, the focus and image processing module 13 is The focus area selects one of the plurality of first sets of photo-sensing signals or one of the plurality of second sets of photo-sensing signals. Then, the focus and image processing module 13 generates a phase difference signal according to the selected first group of optical sensing signals or the second group of optical sensing signals, and the focusing and image processing module 13 generates a focusing signal according to the selected phase difference signal. The first image capturing module 11 and the second image capturing module 12 can share the same focus signal (the first focus signal f1 or the second focus signal f2) to execute the auto focus program.
詳細地說，若上述對焦區域對應於第一影像感測器112的複數個第一相位對焦偵測器的其中之一，則此第一相位對焦偵測器所產生的第一組光感應訊號(即第一光感應訊號p11及第二光感應訊號p12)將被對焦與影像處理模組13所選取，對焦與影像處理模組13依據所選取的第一組光感應訊號產生第一相位差異訊號，接著對焦與影像處理模組13依據第一相位差異訊號產生第一對焦訊號f1，並且對焦與影像處理模組13將所產生的第一對焦訊號f1傳送至第一對焦裝置113的第一對焦驅動電路1131及第二對焦裝置123的第二對焦驅動電路1231。接下來，第一對焦驅動電路1131依據所述第一對焦訊號f1以驅動第一對焦致動器1132調整第一鏡頭模組111的位置，並且第二對焦驅動電路1231亦會依據所述第一對焦訊號f1以驅動第二對焦致動器1232調整第二鏡頭模組121的位置。如此一來，第一影像擷取模組11與第二影像擷取模組12的對焦距離將因此被調整，以完成自動對焦。 In detail, if the focus area corresponds to one of the plurality of first phase focus detectors of the first image sensor 112, the first group of light sensing signals generated by the first phase focus detector The first optical sensing signal p11 and the second optical sensing signal p12 are selected by the focusing and image processing module 13. The focusing and image processing module 13 generates a first phase difference according to the selected first group of optical sensing signals. The first focus signal f1 is generated by the focus and image processing module 13 according to the first phase difference signal, and the focus and image processing module 13 transmits the generated first focus signal f1 to the first focus device 113. The focus drive circuit 1131 and the second focus drive circuit 1231 of the second focus device 123. Next, the first focus driving circuit 1131 adjusts the position of the first lens module 111 by driving the first focus actuator 1132 according to the first focus signal f1, and the second focus driving circuit 1231 is also according to the first The focus signal f1 drives the second focus actuator 1232 to adjust the position of the second lens module 121. As a result, the focusing distance of the first image capturing module 11 and the second image capturing module 12 will be adjusted to complete the auto focus.
反之，若上述對焦區域對應於第二影像感測器122的複數個第二相位對焦偵測器的其中之一，則此第二相位對焦偵測器所產生的第二組光感應訊號(即第三光感應訊號p21及第四光感應訊號p22)將被對焦與影像處理模組13所選取，對焦與影像處理模組13 依據所選取的第二組光感應訊號產生第二相位差異訊號，接著對焦與影像處理模組13依據第二相位差異訊號產生第二對焦訊號f2，並且對焦與影像處理模組13將所產生的第二對焦訊號f2傳送至第一對焦裝置113的第一對焦驅動電路1131及第二對焦裝置123的第二對焦驅動電路1231。接下來，第一對焦驅動電路1131依據所述第二對焦訊號f2以驅動第一對焦致動器1132調整第一鏡頭模組111的位置，並且第二對焦驅動電路1231依據所述第二對焦訊號f2以驅動第二對焦致動器1232調整第二鏡頭模組121的位置。如此一來，第一影像擷取模組11與第二影像擷取模組12的對焦距離將因此被調整，以完成自動對焦。 On the other hand, if the focus area corresponds to one of the plurality of second phase focus detectors of the second image sensor 122, the second group of light sensing signals generated by the second phase focus detector (ie, The third optical sensing signal p21 and the fourth optical sensing signal p22) are selected by the focusing and image processing module 13, and the focusing and image processing module 13 Generating a second phase difference signal according to the selected second group of optical sensing signals, and then the focusing and image processing module 13 generates a second focusing signal f2 according to the second phase difference signal, and the focusing and image processing module 13 generates the generated The second focus signal f2 is transmitted to the first focus drive circuit 1131 of the first focus device 113 and the second focus drive circuit 1231 of the second focus device 123. Next, the first focus driving circuit 1131 drives the first focus actuator 1132 to adjust the position of the first lens module 111 according to the second focus signal f2, and the second focus driving circuit 1231 is configured according to the second focus signal. F2 adjusts the position of the second lens module 121 by driving the second focus actuator 1232. As a result, the focusing distance of the first image capturing module 11 and the second image capturing module 12 will be adjusted to complete the auto focus.
接著，於第一影像擷取模組11及第二影像擷取模組12完成自動對焦後，對焦與影像處理模組13會獲得自動對焦完成後所拍攝之場景的影像。 Then, after the first image capturing module 11 and the second image capturing module 12 complete the auto focus, the focus and image processing module 13 obtains an image of the scene captured after the auto focus is completed.
請同時參照圖1、圖2及圖3，圖2為根據本發明實施例之第一影像感測器之示意圖。圖3為根據本發明實施例之第二影像感測器之示意圖。在本實施例中，第一影像感測器112的第一相位對焦偵測器1121及第二影像感測器122的第二相位對焦偵測器1221係交叉設置並均勻分布於複數個影像感測像素(未繪示)之間。 Please refer to FIG. 1 , FIG. 2 and FIG. 3 simultaneously. FIG. 2 is a schematic diagram of a first image sensor according to an embodiment of the invention. 3 is a schematic diagram of a second image sensor in accordance with an embodiment of the present invention. In this embodiment, the first phase focus detector 1121 of the first image sensor 112 and the second phase focus detector 1221 of the second image sensor 122 are cross-arranged and evenly distributed in a plurality of image senses. Measure between pixels (not shown).
接下來，將列舉多個例子以進一步的輔助說明所本發明實施例所提出之影像擷取裝置10的使用方式。 Next, a plurality of examples will be given to further explain the manner of use of the image capturing device 10 proposed by the embodiment of the present invention.
請同時參照圖1至圖4，圖4為根據本發明實施例之影像擷取裝置之使用示意圖。如圖4所示，本發明實施例所提出之影像擷取裝置10可實現於智慧型手機P。詳細地說，第一影像擷取模組11及第二影像擷取模組12可設置於智慧型手機P的右上角落，並且第一鏡頭模組111及第二鏡頭模組121部分外露於智慧型手機P，以便分別擷取場景。 Please refer to FIG. 1 to FIG. 4 simultaneously. FIG. 4 is a schematic diagram of the use of the image capturing device according to an embodiment of the invention. As shown in FIG. 4, the image capturing device 10 according to the embodiment of the present invention can be implemented in the smart phone P. In detail, the first image capturing module 11 and the second image capturing module 12 can be disposed in the upper right corner of the smart phone P, and the first lens module 111 and the second lens module 121 are partially exposed to wisdom. Type phone P to capture the scene separately.
於使用者打開相機APP程式後，第一鏡頭模組111及第二鏡頭模組121將欲拍攝場景分別成像於第一影像感測器112及第二 影像感測器122上，接著第一影像感測器112及第二影像感測器122分別對應產生第一影像i1、複數個第一組光感應訊號、第二影像i2、複數個第二組光感應訊號。接下來，對焦與影像處理模組13依據第一影像i1及第二影像i2，以初步生成預覽影像於智慧型手機P的顯示螢幕上，並且對焦與影像處理模組13依據其中一第一組光感應訊號獲得第一對焦訊號f1或依據其中一第二組光感應訊號獲得第二對焦訊號f2。 After the user opens the camera APP program, the first lens module 111 and the second lens module 121 respectively image the scene to be captured to the first image sensor 112 and the second image. The first image sensor 112 and the second image sensor 122 respectively generate a first image i1, a plurality of first group of light sensing signals, a second image i2, and a plurality of second groups. Light sensing signal. Next, the focus and image processing module 13 initially generates a preview image on the display screen of the smart phone P according to the first image i1 and the second image i2, and the focus and image processing module 13 is based on one of the first groups. The photo-sensing signal obtains the first focus signal f1 or obtains the second focus signal f2 according to one of the second group of photo-sensing signals.
進一步地說，如圖4所示，方框A所圈選之整個影像畫面對應於第一鏡頭模組111之拍攝場景，而方框B所圈選之影像畫面對應於第一鏡頭模組111及第二鏡頭模組121之成像視角重疊區域(即第一鏡頭模組111及第二鏡頭模組121之拍攝場景中屬相同之區域)。更進一步地說，方框A所圈選之畫面並除去方框B所圈選之畫面的區域(即方框C)對應於第一影像感測器112內的部分多個第一相位對焦偵測器1121，以及方框B所圈選之畫面區域對應於第二影像感測器122內所有的第二相位對焦偵測器1221以及排除上述之部分的多個相位對焦偵測器1121後剩餘的多個第一相位對焦偵測器1121。 Further, as shown in FIG. 4, the entire image frame circled by the box A corresponds to the shooting scene of the first lens module 111, and the image frame circled by the box B corresponds to the first lens module 111. The image viewing angle overlapping area of the second lens module 121 (ie, the same area in the shooting scenes of the first lens module 111 and the second lens module 121). Furthermore, the area circled by the block A and the area of the picture circled by the block B (ie, the box C) correspond to a part of the first phase focus detection in the first image sensor 112. The detector 1121, and the frame area circled by the block B correspond to all the second phase focus detectors 1221 in the second image sensor 122 and the plurality of phase focus detectors 1121 excluding the above parts. A plurality of first phase focus detectors 1121.
針對智慧型手機P所顯示之預覽影像，若使用者利用手指或觸控筆隨機點選對焦區域R1(位於方框B所圈選之畫面區域內)，則對應於成像視角重疊區域之複數個第二相位對焦偵測器1221的其中之一所產生的第二組光感應訊號或複數個第一相位對焦偵測器1121的其中之一所產生的第一組光感應訊號將對應被對焦與影像處理模組13所選取，其中被選取的第二相位對焦偵測器1221或第一相位對焦偵測器1121對應於對焦區域R1於方框B所圈選之畫面區域中之所在處。 For the preview image displayed by the smart phone P, if the user randomly clicks the focus area R1 (in the picture area circled by the box B) with a finger or a stylus, it corresponds to the plurality of overlapping areas of the imaging angle of view. The first group of photo-sensing signals generated by one of the second group of photo-sensing signals or one of the plurality of first-phase focus detectors 1121 generated by one of the second phase focus detectors 1221 will be correspondingly focused and The image processing module 13 selects, wherein the selected second phase focus detector 1221 or the first phase focus detector 1121 corresponds to where the focus area R1 is located in the picture area circled by the block B.
更進一步地說，若其中一第二組光感應訊號(即第三光感應訊號p21及第四光感應訊號p22)被選取，則對焦與影像處理模組13對所選取的第二組光感應訊號進行處理，以對應產生第二對焦訊 號f2。接下來，對焦與影像處理模組13傳送第二對焦訊號f2至第一對焦驅動電路1131及第二對焦驅動電路1231。第一對焦驅動電路1131依據第二對焦訊號f2驅動第一對焦致動器1132對應調整第一鏡頭模組111的位置，以及第二對焦驅動電路1231依據第二對焦訊號f2驅動第二對焦致動器1232對應調整第二鏡頭模組121的位置，以調整第一影像擷取模組11及第二影像擷取模組12的對焦距離。 Further, if one of the second group of optical sensing signals (ie, the third optical sensing signal p21 and the fourth optical sensing signal p22) is selected, the focusing and image processing module 13 senses the selected second group of optical signals. The signal is processed to generate a second focus signal No. f2. Next, the focus and image processing module 13 transmits the second focus signal f2 to the first focus drive circuit 1131 and the second focus drive circuit 1231. The first focus drive circuit 1131 drives the first focus actuator 1132 to adjust the position of the first lens module 111 according to the second focus signal f2, and the second focus drive circuit 1231 drives the second focus actuation according to the second focus signal f2. The position of the second lens module 121 is adjusted to adjust the focus distance of the first image capturing module 11 and the second image capturing module 12 .
另一方面，若其中一第一組光感應訊號(即第一光感應訊號p11及第二光感應訊號p12)被選取，則對焦與影像處理模組13對所選取的第一組光感應訊號進行處理，以對應產生第一對焦訊號f1。接下來，對焦與影像處理模組13傳送第一對焦訊號f1至第一對焦驅動電路1131及第二對焦驅動電路1231。第一對焦驅動電路1131依據第一對焦訊號f1驅動第一對焦致動器1132對應調整第一鏡頭模組111的位置，以及第二對焦驅動電路1231依據第一對焦訊號f1驅動第二對焦致動器1232對應調整第二鏡頭模組121的位置，以調整第一影像擷取模組11及第二影像擷取模組12的對焦距離。 On the other hand, if one of the first group of optical sensing signals (ie, the first optical sensing signal p11 and the second optical sensing signal p12) is selected, the focusing and image processing module 13 selects the selected first group of optical sensing signals. Processing is performed to correspondingly generate the first focus signal f1. Next, the focus and image processing module 13 transmits the first focus signal f1 to the first focus drive circuit 1131 and the second focus drive circuit 1231. The first focus drive circuit 1131 drives the first focus actuator 1132 to adjust the position of the first lens module 111 according to the first focus signal f1, and the second focus drive circuit 1231 drives the second focus actuation according to the first focus signal f1. The position of the second lens module 121 is adjusted to adjust the focus distance of the first image capturing module 11 and the second image capturing module 12 .
於對焦程序完成後，第一影像感測器112生成對應於其對焦距離之第一影像i1，且第二影像感測器122生成對應於其對焦距離的第二影像i2，並且影像處理模組13融合對應於對焦距離的第一影像i1及第二影像i2以獲得合成影像。簡單地說，由於對焦區域R1於預覽影像內之位置屬於第一鏡頭模組111及第二鏡頭模組121的視角重疊之區域(即方框B所圈選之畫面區域)，因此依據對焦區域R1的位置，對應於視角重疊區域之一第二相位對焦偵測器1221或一第一相位對焦偵測器1121所產生的一組光感應訊號將被選取，而對焦與影像處理模組13便可依據此組光感應訊號產生對焦訊號，如此將可使進行對焦後之融合影像於具有較清晰之影像畫質。 After the focus program is completed, the first image sensor 112 generates a first image i1 corresponding to the focus distance thereof, and the second image sensor 122 generates a second image i2 corresponding to the focus distance thereof, and the image processing module 13 merging the first image i1 and the second image i2 corresponding to the focus distance to obtain a composite image. Briefly, since the position of the focus area R1 in the preview image belongs to the area where the angles of view of the first lens module 111 and the second lens module 121 overlap (ie, the area of the picture circled by the box B), the focus area is The position of R1 corresponds to a set of photo-sensing signals generated by the second phase focus detector 1221 or a first phase focus detector 1121 corresponding to one of the viewing angle overlapping regions, and the focusing and image processing module 13 is selected. The focus signal can be generated according to the group of light sensing signals, so that the fused image after focusing can be made with clear image quality.
另一方面，若使用者利用手指或觸控筆隨機點選對焦區域R2(位於方框C所圈選之畫面的區域內)，則對應於非成像視角重疊區域之其中一個第一相位對焦偵測器1121所產生的第一組光感應訊號將被選取，其中被選取的第一相位對焦偵測器1121對應於對焦區域R2於方框C所圈選之畫面區域中之所在處。對焦與影像處理模組13對所選取的第一組光感應訊號進行處理，以對應產生第一對焦訊號f1。接下來，對焦與影像處理模組13傳送第一對焦訊號f1至第一對焦驅動電路1131及第二對焦驅動電路1231。第一對焦驅動電路1131依據第一對焦訊號f1驅動第一對焦致動器1132對應調整第一鏡頭模組111的位置，以及第二對焦驅動電路1231依據第一對焦訊號f1驅動第二對焦致動器1232對應調整第二鏡頭模組121的位置，以調整第一影像擷取模組11及第二影像擷取模組12的對焦距離。於對焦程序完成後，第一影像感測器112生成對應於其對焦距離之第一影像i1，且第二影像感測器122生成對應於其對焦距離之第二影像i2，並且影像處理模組13融合對應於對焦距離之第一影像i1及第二影像i2以獲得融合影像。 On the other hand, if the user randomly clicks on the focus area R2 (in the area of the picture circled by the box C) with a finger or a stylus, one of the first phase focus detections corresponding to the non-imaged view overlap area is used. The first set of optical sensing signals generated by the detector 1121 will be selected, wherein the selected first phase focus detector 1121 corresponds to where the focus area R2 is located in the picture area circled by the block C. The focus and image processing module 13 processes the selected first group of photo-sensing signals to correspondingly generate the first focus signal f1. Next, the focus and image processing module 13 transmits the first focus signal f1 to the first focus drive circuit 1131 and the second focus drive circuit 1231. The first focus drive circuit 1131 drives the first focus actuator 1132 to adjust the position of the first lens module 111 according to the first focus signal f1, and the second focus drive circuit 1231 drives the second focus actuation according to the first focus signal f1. The position of the second lens module 121 is adjusted to adjust the focus distance of the first image capturing module 11 and the second image capturing module 12 . After the focus program is completed, the first image sensor 112 generates a first image i1 corresponding to the focus distance thereof, and the second image sensor 122 generates a second image i2 corresponding to the focus distance thereof, and the image processing module 13 merging the first image i1 and the second image i2 corresponding to the focusing distance to obtain a fused image.
簡單地說，由於對焦區域點R2於預覽影像內之位置屬於第一鏡頭模組111及第二鏡頭模組121的非視角重疊之區域，因此依據對焦區域點R2的位置，影像處理模組13將選取由對應於非視角重疊之區域之一第一相位對焦偵測器1121所產生的第一組光感應訊號，接著影像處理模組13依據所選取的第一組光感應訊號產生第一對焦訊號f1，第一對焦裝置113利用第一對焦訊號f1對應調整第一鏡頭模組111的位置，藉此產生畫質清晰之第一影像i1。另一方面，第二對焦裝置123利用第一對焦訊號f1對應調整第二鏡頭模組121的位置，藉此產生畫質清晰之第二影像i2。 In short, since the position of the focus area point R2 in the preview image belongs to the non-viewing area of the first lens module 111 and the second lens module 121, the image processing module 13 according to the position of the focus area point R2. The first group of light sensing signals generated by the first phase focus detector 1121 corresponding to one of the non-view overlapping regions is selected, and then the image processing module 13 generates the first focus according to the selected first group of light sensing signals. In the signal f1, the first focusing device 113 adjusts the position of the first lens module 111 correspondingly by using the first focusing signal f1, thereby generating the first image i1 with clear image quality. On the other hand, the second focusing device 123 adjusts the position of the second lens module 121 correspondingly by using the first focus signal f1, thereby generating a second image i2 with clear image quality.
值得注意的是，本發明實施例所提出之影像擷取裝置10除了可應用於智慧型手機外，亦可應用於數位相機或其他攝像裝置，上述圖4實施例僅是用以輔助說明本發明影像擷取裝置10之相關 工作細節，本發明並不以此為限。 It should be noted that the image capturing device 10 of the embodiment of the present invention can be applied to a digital camera or other camera device in addition to the smart phone. The above embodiment of FIG. 4 is only for explaining the present invention. Image capture device 10 related The details of the work, the invention is not limited thereto.
值得一提的是，針對對焦區域R1來說，於影像擷取裝置10執行對焦程序的過程中，假設第一影像擷取模組11之第一對焦裝置113係依據第一對焦訊號f1來調整第一鏡頭模組111的位置，以及第二影像擷取模組12之第二對焦裝置123係依據第一對焦訊號f1來調整第二鏡頭模組121的位置，則於第二鏡頭模組121被移動至一對應位置後，對焦與影像處理模組13將進一步地判斷對應於所述位置而獲得之第二影像i2於對焦區域的對比度是否超過特定門限值或為最大對比度。 It is to be noted that, in the focus area R1, in the process of performing the focusing process by the image capturing device 10, it is assumed that the first focusing device 113 of the first image capturing module 11 is adjusted according to the first focusing signal f1. The position of the first lens module 111 and the second focusing device 123 of the second image capturing module 12 adjust the position of the second lens module 121 according to the first focus signal f1, and then the second lens module 121 After being moved to a corresponding position, the focus and image processing module 13 further determines whether the contrast of the second image i2 obtained in the focus area corresponding to the position exceeds a certain threshold or is the maximum contrast.
若上述所獲得之第二影像i2於對焦區域的對比度未超過特定門限值或非為最大對比度，則對焦與影像處理模組13驅動第二對焦裝置123調整第二鏡頭模組121的位置至另一位置，亦即對焦與影像處理模組13產生第三對焦訊號(未繪示)至第二對焦驅動電路1231，促使第二對焦驅動電路1231依據第三對焦訊號驅動第二對焦致動器1232再次調整第二鏡頭模組121的位置，以獲得對焦區域對比度超過特定門限值的第二影像i2或具有最大對比度的第二影像i2。 If the contrast of the second image i2 obtained in the focus area does not exceed a certain threshold or is not the maximum contrast, the focus and image processing module 13 drives the second focusing device 123 to adjust the position of the second lens module 121 to another A position, that is, the focus and image processing module 13 generates a third focus signal (not shown) to the second focus drive circuit 1231, causing the second focus drive circuit 1231 to drive the second focus actuator 1232 according to the third focus signal. The position of the second lens module 121 is adjusted again to obtain a second image i2 whose focus area contrast exceeds a certain threshold value or a second image i2 having a maximum contrast ratio.
反之，若上述所獲得之第二影像i2於對焦區域的對比度超過特定門限值或為最大對比度，則對焦與影像處理模組13不會驅動第二對焦裝置123來變更第二鏡頭模組121的位置，而是維持第二鏡頭模組121於目前所在的位置。 On the other hand, if the contrast of the second image i2 obtained in the focus area exceeds a certain threshold or is the maximum contrast, the focus and image processing module 13 does not drive the second focusing device 123 to change the second lens module 121. Position, but maintain the second lens module 121 at the current location.
同樣地，針對對焦區域R1來說，於執行對焦程序的過程中，假設第一影像擷取模組11之第一對焦裝置113係依據第二對焦訊號f2來調整第一鏡頭模組111的位置，以及第二影像擷取模組12之第二對焦裝置123係依據第二對焦訊號f2來調整第二鏡頭模組121的位置，則於第一鏡頭模組111被移動至一對應位置後，影像處理模組13將進一步地判斷對應於所述對應位置而獲得之第一影像i1於對焦區域的對比度是否超過特定門限值或為最大對比度。 Similarly, for the focus area R1, in the process of performing the focus process, it is assumed that the first focusing device 113 of the first image capturing module 11 adjusts the position of the first lens module 111 according to the second focus signal f2. And the second focusing device 123 of the second image capturing module 12 adjusts the position of the second lens module 121 according to the second focusing signal f2, after the first lens module 111 is moved to a corresponding position, The image processing module 13 further determines whether the contrast of the first image i1 obtained in the corresponding focus position in the focus area exceeds a certain threshold value or is the maximum contrast.
若上述所獲得之第一影像i1於對焦區域的對比度未超過特定門限值或非為最大對比度，則對焦與影像處理模組13驅動第一對焦裝置113調整第一鏡頭模組111的位置至另一位置，亦即對焦與影像處理模組13產生第三對焦訊號(未繪示)至第一對焦驅動電路1131，促使第一對焦驅動電路1131依據第三對焦訊號驅動第一對焦致動器1132再次調整第一鏡頭模組111的位置，以獲得對焦區域對比度超過特定門限值的第一影像i1或具有最大對比度的第一影像i1。 If the contrast of the first image i1 obtained in the focus area does not exceed a certain threshold or is not the maximum contrast, the focus and image processing module 13 drives the first focusing device 113 to adjust the position of the first lens module 111 to another A position, that is, the focus and image processing module 13 generates a third focus signal (not shown) to the first focus drive circuit 1131, causing the first focus drive circuit 1131 to drive the first focus actuator 1132 according to the third focus signal. The position of the first lens module 111 is adjusted again to obtain a first image i1 whose focus area contrast exceeds a certain threshold value or a first image i1 having a maximum contrast.
反之，若上述所獲得之第一影像i1於對焦區域的對比度超過特定門限值或為最大對比度，則對焦與影像處理模組13不會驅動第一對焦裝置113來變更第一鏡頭模組111的位置，而是維持第一鏡頭模組111於目前所在的位置。 On the other hand, if the contrast of the first image i1 obtained in the focus area exceeds a certain threshold or is the maximum contrast, the focus and image processing module 13 does not drive the first focusing device 113 to change the first lens module 111. Position, but maintain the first lens module 111 at the current location.
簡單地說，針對對焦區域R1來說，即使第一影像擷取模組11係依據第二對焦訊號f2來調整第一鏡頭模組111的位置，或第二影像擷取模組12係依據第一對焦訊號f1來調整第二鏡頭模組121的位置，經由對焦與影像處理模組13於對焦後進一步地判斷第一影像i1或第二影像i2於對焦區域之對比度是否超過特定門限值或為最大對比度後且進一步決定是否變更第一鏡頭模組111或第二鏡頭模組121的位置，對焦與影像處理模組13可以藉此確保於對焦後之第一影像i1及第二影像i2所生成之融合影像具有較佳的畫質。 Briefly, for the focus area R1, even if the first image capturing module 11 adjusts the position of the first lens module 111 according to the second focus signal f2, or the second image capturing module 12 is based on the first A focus signal f1 is used to adjust the position of the second lens module 121. After focusing, the focus and image processing module 13 further determines whether the contrast of the first image i1 or the second image i2 in the focus area exceeds a certain threshold or After the maximum contrast and further determining whether to change the position of the first lens module 111 or the second lens module 121, the focus and image processing module 13 can thereby ensure that the first image i1 and the second image i2 are generated after focusing. The fused image has a better picture quality.
又，值得一提的是，在本實施例中，影像擷取裝置10雖然僅包括第一影像擷取模組11及第二影像擷取模組12，但本實施例並不限制影像擷取裝置10所包含之影像擷取模組的數量，即影像擷取裝置10可進一步地包括第三至第N影像擷取模組，亦即影像擷取裝置10可包括至少兩個以上影像擷取模組，並且多個影像擷取模組間具有不同視角之鏡頭模組，而當多組光感應訊號的其中之一被選取時，所述多個影像擷取模組內之對焦裝置皆可依據此組光感應訊號調整所述多個鏡頭模組的位置，以達成自動對焦。於 完成對焦後，影像擷取裝置10的對焦與影像處理模組13融合多個影像擷取模組所產生的多個影像，以對應產生具較佳畫質的融合影像。在此請注意，若所述多個影像擷取模組進行對焦後所產生的多個影像於對焦區域之對比度未達特定門限值或非為最大對比度時，則對焦與影像處理模組13驅使所述多個影像擷取模組改用對比度檢測對焦來取得最佳的對焦距離，以確保融合影像具有較高的影像品質。值得注意的是，關於包括至少兩個以上影像擷取模組之影像擷取裝置的其他相關細節，已在上述圖1~圖4實施例做詳細說明，在此恕不贅述。 In addition, in this embodiment, the image capturing device 10 includes only the first image capturing module 11 and the second image capturing module 12, but the embodiment does not limit the image capturing. The image capture device 10 can further include a third to Nth image capture module, that is, the image capture device 10 can include at least two image captures. a module, and a plurality of image capturing modules having different viewing angles between the modules, and when one of the plurality of optical sensing signals is selected, the focusing devices in the plurality of image capturing modules are Adjusting the positions of the plurality of lens modules according to the group of light sensing signals to achieve auto focus. to After the focus is completed, the focus and image processing module 13 of the image capturing device 10 combines the plurality of images generated by the plurality of image capturing modules to generate a fused image with better image quality. Please note that if the contrast of the plurality of images generated by the plurality of image capturing modules after focusing in the focus area does not reach a certain threshold or is not the maximum contrast, the focus and image processing module 13 drives The plurality of image capturing modules use contrast detection focusing to obtain an optimal focusing distance to ensure a high image quality of the fused image. It should be noted that other related details of the image capturing device including at least two image capturing modules have been described in detail in the above embodiments of FIG. 1 to FIG. 4 and will not be described herein.
在接下來的多個實施例中，將描述不同於上述圖1實施例之部分，且其餘省略部分與上述圖1實施例之部分相同。此外，為說明便利起見，相似之參考數字或標號指示相似之元件。 In the following various embodiments, portions different from the above-described embodiment of Fig. 1 will be described, and the remaining omitted portions are the same as those of the above-described embodiment of Fig. 1. In addition, for the sake of convenience, like reference numerals or numerals indicate similar elements.
請同時參照圖1、圖3與圖5，圖5為根據本發明另一實施例之第一影像感測器之示意圖。如圖5所示，相較於圖2實施例所示之第一影像感測器112，第一影像感測器512所具有的第一相位對焦偵測器1121之數量相對較少，並且多個第一相位對焦偵測器1121於第一影像感測器512內具有特定的分布位置。 Please refer to FIG. 1 , FIG. 3 and FIG. 5 simultaneously. FIG. 5 is a schematic diagram of a first image sensor according to another embodiment of the invention. As shown in FIG. 5, the first image sensor 512 has a relatively small number of first phase focus detectors 1121 compared to the first image sensor 112 shown in the embodiment of FIG. The first phase focus detectors 1121 have specific distribution locations within the first image sensor 512.
詳細地說，多個第一相位對焦偵測器1121於第一影像感測器512內之分布位置係相關於第一鏡頭模組111及第二鏡頭模組121的非視角重疊區域，非視角重疊區域即指於第一鏡頭模組111之拍攝場景中排除第一鏡頭模組111及第二鏡頭模組121之拍攝場景中屬相同之區域。如圖5所示，多個第一相位對焦偵測器1121僅分布於第一影像感測器512內屬外圍區域之第一區域S1，並且於第一影像感測器512內屬中心區域之第二區域S2並未設置有第一相位對焦偵測器1121，其中第一區域S1對應於第一鏡頭模組111及第二鏡頭模組121的非視角重疊區域，並且第二區域S2對應於第一鏡頭模組111及第二鏡頭模組121的視角重疊區域。 In detail, the distribution positions of the plurality of first phase focus detectors 1121 in the first image sensor 512 are related to the non-viewing overlap regions of the first lens module 111 and the second lens module 121, and the non-viewing angles. The overlapping area refers to the same area in the shooting scene in which the first lens module 111 and the second lens module 121 are excluded from the shooting scene of the first lens module 111. As shown in FIG. 5, the plurality of first phase focus detectors 1121 are only distributed in the first region S1 of the peripheral region of the first image sensor 512, and are in the central region of the first image sensor 512. The second area S2 is not provided with the first phase focus detector 1121, wherein the first area S1 corresponds to the non-view angle overlapping area of the first lens module 111 and the second lens module 121, and the second area S2 corresponds to The viewing angle overlap area of the first lens module 111 and the second lens module 121.
於此實施例中，由於第一影像擷取模組11之第一鏡頭模組111的視角大於第二影像擷取模組12之第二鏡頭模組121，因此針對第一鏡頭模組111及第二鏡頭模組121之視角重疊區域所對應之成像畫面，可透過第二影像感測器122提供對應於視角重疊區域之一組光感應訊號，如此於對焦程序完成後，對焦與影像處理模組13依舊可產生畫質清晰之融合影像。 In this embodiment, since the first lens module 111 of the first image capturing module 11 has a larger viewing angle than the second lens module 121 of the second image capturing module 12, the first lens module 111 and The imaging image corresponding to the overlapping area of the viewing angle of the second lens module 121 can provide a group of light sensing signals corresponding to the overlapping areas of the viewing angle through the second image sensor 122, so that after the focusing process is completed, the focusing and image processing modes are performed. Group 13 still produces a fused image with clear picture quality.
簡單地說，第一相位對焦偵測器1121於第一影像感測器512內之分布位置相關於第一鏡頭模組111及第二鏡頭模組121的非視角重疊區域，並且第二相位對焦偵測器1221於第二影像感測器122內之分布位置相關於第一鏡頭模組111及第二鏡頭模組121的視角重疊區域。如此，將可以減少相位對焦偵測器的數量，而降低影像擷取裝置10的成本，並且在有限的相位對焦偵測器的設置數目下，還能具有高畫質的融合影像。 Briefly, the distribution position of the first phase focus detector 1121 in the first image sensor 512 is related to the non-view overlap area of the first lens module 111 and the second lens module 121, and the second phase is in focus. The position of the detector 1221 in the second image sensor 122 is related to the overlapping area of the first lens module 111 and the second lens module 121. In this way, the number of phase focus detectors can be reduced, and the cost of the image capturing device 10 can be reduced, and a high-quality fused image can be obtained with a limited number of phase focus detectors.
於其他實施例中，對應於第一鏡頭模組111及第二鏡頭模組121的非視角重疊區域，可設置有數量較多之第一相位對焦偵測器1121於第一影像感測器512之第一區域S1內。對應於第一鏡頭模組111及第二鏡頭模組121的視角重疊區域，可設置有數量較少的第一相位對焦偵測器1121於第一影像感測器512之第二區域S2內。換言之，第一相位對焦偵測器1121於第一區域S1內的分布密度大於第一相位對焦偵測器1121於第二區域S2內的分布密度。 In other embodiments, a plurality of first phase focus detectors 1121 may be disposed on the first image sensor 512 corresponding to the non-view overlapping regions of the first lens module 111 and the second lens module 121. In the first area S1. A plurality of first phase focus detectors 1121 are disposed in the second region S2 of the first image sensor 512 corresponding to the viewing angle overlapping regions of the first lens module 111 and the second lens module 121. In other words, the distribution density of the first phase focus detector 1121 in the first region S1 is greater than the distribution density of the first phase focus detector 1121 in the second region S2.
請同時參照圖1至圖6，圖6為根據本發明實施例之自動對焦方法之流程圖。圖6之物件定位方法可以執行於影像擷取裝置10中，且其步驟說明如下。 Please refer to FIG. 1 to FIG. 6 simultaneously. FIG. 6 is a flowchart of an autofocus method according to an embodiment of the present invention. The object positioning method of FIG. 6 can be performed in the image capturing device 10, and the steps thereof are explained below.
於步驟S601中，選取一個對焦區域。 In step S601, a focus area is selected.
於步驟S602中，依據對焦區域於預覽影像(尚未進行對焦)的位置，對焦與影像處理模組13選取多組光感應訊號的其中之一。詳細地說，依據上述多個實施例，多組光感應訊號分別為複數個 第一組光感應訊號及複數個第二組光感應訊號，而所述複數個第一組光感應訊號為第一影像擷取模組11的複數個第一相位對焦偵測器1121根據被拍攝場景所產生，以及所述複數個第二組光感應訊號為第二影像擷取模組12的複數個第二相位對焦偵測器1221根據被拍攝場景所產生。在此步驟中，對焦與影像處理模組13依據所述對焦區域於預覽影像中的所在處，選取複數個第一組光感應訊號或第二組光感應訊號的其中之一。 In step S602, the focus and image processing module 13 selects one of the plurality of sets of photo-sensing signals according to the position of the focus area in the preview image (not yet focused). In detail, according to the above multiple embodiments, multiple sets of optical sensing signals are respectively plural The first set of optical sensing signals and the plurality of second optical sensing signals, and the plurality of first optical sensing signals are the first first phase focusing detectors 1121 of the first image capturing module 11 according to the image being captured. The plurality of second phase focus detectors 1221 generated by the scene and the plurality of second group of optical sensing signals being the second image capturing module 12 are generated according to the captured scene. In this step, the focus and image processing module 13 selects one of the plurality of first group of photo-sensing signals or the second group of photo-sensing signals according to where the focus area is located in the preview image.
於步驟S603中，對焦與影像處理模組13依據此組光感應訊號產生對焦訊號f，亦即對焦與影像處理模組13依據第一組光感應訊號產生第一相位差異訊號，並且對焦與影像處理模組13依據所述第一相位差異訊號產生第一對焦訊號f1，接著對焦與影像處理模組13將所產生的第一對焦訊號f1傳送至第一對焦裝置113及第二對焦裝置123，抑或對焦與影像處理模組13依據第二組光感應訊號產生第二相位差異訊號，並且對焦與影像處理模組13依據所述第二相位差異訊號產生第二對焦訊號f2，接著對焦與影像處理模組13將所產生的第二對焦訊號f2傳送至第一對焦裝置113及第二對焦裝置123。 In step S603, the focus and image processing module 13 generates a focus signal f according to the set of light sensing signals, that is, the focus and image processing module 13 generates a first phase difference signal according to the first group of light sensing signals, and focuses and images. The processing module 13 generates a first focus signal f1 according to the first phase difference signal, and then the focus and image processing module 13 transmits the generated first focus signal f1 to the first focusing device 113 and the second focusing device 123. Or the focus and image processing module 13 generates a second phase difference signal according to the second group of light sensing signals, and the focus and image processing module 13 generates the second focus signal f2 according to the second phase difference signal, and then the focus and image processing. The module 13 transmits the generated second focus signal f2 to the first focusing device 113 and the second focusing device 123.
於步驟S604中，第一對焦裝置113及第二對焦裝置123依據對焦訊號(第一對焦訊號f1或第二對焦訊號f2)分別對應調整第一鏡頭模組111及第二鏡頭模組121的位置，亦即第一對焦裝置113及第二對焦裝置123根據第一對焦訊號f1或第二對焦訊號f2調整第一鏡頭模組111及第二鏡頭模組121的位置至一對應位置。 In step S604, the first focusing device 113 and the second focusing device 123 respectively adjust the positions of the first lens module 111 and the second lens module 121 according to the focus signal (the first focus signal f1 or the second focus signal f2). The first focusing device 113 and the second focusing device 123 adjust the positions of the first lens module 111 and the second lens module 121 to a corresponding position according to the first focusing signal f1 or the second focusing signal f2.
於步驟S605中，在第一鏡頭模組111或第二鏡頭模組121的位置被移動後，對焦與影像處理模組13進一步判斷所選取的對焦區域是否位於第一鏡頭模組111及第二鏡頭模組121之拍攝場景中屬相同之區域內，即所選取的對焦區域是否對應於第一鏡頭模組111及第二鏡頭模組121之成像視角重疊區域。 In step S605, after the position of the first lens module 111 or the second lens module 121 is moved, the focus and image processing module 13 further determines whether the selected focus area is located in the first lens module 111 and the second. In the shooting area of the lens module 121, the selected focus area corresponds to the overlapping imaging area of the first lens module 111 and the second lens module 121.
若步驟S605中對焦與影像處理模組13判斷所選取的對焦區域 位於第一鏡頭模組111及第二鏡頭模組121之拍攝場景中屬相同之區域內，則執行步驟S606；反之，則執行步驟S607。 If the focus and image processing module 13 determines the selected focus area in step S605 If the imaging scenes of the first lens module 111 and the second lens module 121 are in the same area, step S606 is performed; otherwise, step S607 is performed.
於步驟S606中，對焦與影像處理模組13更進一步判斷對應於步驟S605所述之對應位置而獲得的第一影像i1或第二影像i2於對焦區域的對比度是否為最大對比度或超過特定門限值。若上述對焦訊號為第一對焦訊號f1，則步驟S606比對的是第二影像i2於對焦區域的對比度；若上述對焦訊號為第二對焦訊號f2，則步驟S606比對的是第一影像i1於對焦區域的對比度。 In step S606, the focus and image processing module 13 further determines whether the contrast of the first image i1 or the second image i2 obtained in the focus area corresponding to the corresponding position in step S605 is the maximum contrast or exceeds a certain threshold. . If the focus signal is the first focus signal f1, the step S606 compares the contrast of the second image i2 with the focus area; if the focus signal is the second focus signal f2, the step S606 compares the first image i1. Contrast in the focus area.
於步驟S607中，維持第一鏡頭模組111與第二鏡頭模組121目前所在的位置，以完成對焦。 In step S607, the current position of the first lens module 111 and the second lens module 121 is maintained to complete the focus.
若步驟S606中對焦與影像處理模組13判斷第一影像i1或第二影像i2於對焦區域的對比度非為最大對比度或未超過特定門限值，則執行步驟S608；反之，則執行步驟S607，以完成對焦。 If the focus and image processing module 13 determines in step S606 that the contrast of the first image i1 or the second image i2 in the focus area is not the maximum contrast or does not exceed the specific threshold, step S608 is performed; otherwise, step S607 is performed to Finish the focus.
於步驟S608中，對焦與影像處理模組13驅動第一對焦裝置113調整第一鏡頭模組111的位置(即調整第一影像擷取模組11的對焦距離)直至第一影像感測器112所產生的第一影像i1於對焦區域的對比度為最大對比度或超過特定門限值，或者對焦與影像處理模組13驅動第二對焦裝置123調整第二鏡頭模組121的位置(即調整第二影像擷取模組12的對焦距離)直至第二影像感測器122所產生的第二影像i2於對焦區域的對比度為最大對比度或超過特定門限值。若上述對焦訊號為第一對焦訊號f1，則步驟S608驅動的是第二對焦裝置123；若上述對焦訊號為第二對焦訊號f2，則步驟S608驅動的是第一對焦裝置113。 In step S608, the focus and image processing module 13 drives the first focusing device 113 to adjust the position of the first lens module 111 (ie, adjust the focusing distance of the first image capturing module 11) until the first image sensor 112 The contrast of the first image i1 generated in the focus area is the maximum contrast or exceeds a certain threshold, or the focus and image processing module 13 drives the second focusing device 123 to adjust the position of the second lens module 121 (ie, adjust the second image) The focus distance of the module 12 is captured until the contrast of the second image i2 generated by the second image sensor 122 in the focus area is the maximum contrast or exceeds a certain threshold. If the focus signal is the first focus signal f1, the step S608 drives the second focus device 123; if the focus signal is the second focus signal f2, the step S608 drives the first focus device 113.
另外，須說明的是，圖6實施例之各步驟僅為方便說明之須要，本發明實施例並不以各步驟彼此間的順序作為實施本發明各個實施例的限制條件。 In addition, it should be noted that the steps of the embodiment of FIG. 6 are only for convenience of description, and the embodiments of the present invention do not use the steps of the steps as the limitation of implementing the embodiments of the present invention.
綜上所述，本發明實施例所提出的影像擷取裝置及其自動對焦 方法，在影像擷取裝置上裝設複數個不同視角的影像擷取模組，當多組光感應訊號的其中之一被選取時，對焦與影像處理模組處理此組光感應訊號以產生對應的相位差異訊號，並且對焦與影像處理模組依據所述相位差異訊號產生對焦訊號，藉此不同的影像擷取模組能共用同一對焦訊號，因此可減少相位對焦偵測器的設置數目以降低成本，並可提高對焦後之融合影像的畫質。 In summary, the image capturing device and the auto focus thereof are provided in the embodiments of the present invention. The image capturing device is provided with a plurality of image capturing modules of different viewing angles. When one of the plurality of optical sensing signals is selected, the focusing and image processing module processes the set of optical sensing signals to generate a corresponding image. The phase difference signal, and the focus and image processing module generates a focus signal according to the phase difference signal, so that different image capture modules can share the same focus signal, thereby reducing the number of phase focus detectors to reduce the number of phase focus detectors Cost, and improve the quality of the fused image after focusing.
惟上述所揭露之圖式及說明，僅為本發明之實施例而已，然其並非用以限定本發明，任何熟習此技藝者，當可依據上述之說明做各種之更動與潤飾，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。 The drawings and the descriptions of the present invention are only examples of the present invention, and are not intended to limit the present invention. Anyone skilled in the art can make various changes and refinements according to the above description. The simple equivalent changes and modifications made by the scope of the invention and the description of the invention are still within the scope of the invention.
10‧‧‧影像擷取裝置 10‧‧‧Image capture device
11‧‧‧第一影像擷取模組 11‧‧‧First image capture module
12‧‧‧第二影像擷取模組 12‧‧‧Second image capture module
13‧‧‧對焦與影像處理模組 13‧‧‧Focus and Image Processing Module
111‧‧‧第一鏡頭模組 111‧‧‧First lens module
112‧‧‧第一影像感測器 112‧‧‧First Image Sensor
113‧‧‧第一對焦裝置 113‧‧‧First focusing device
121‧‧‧第二鏡頭模組 121‧‧‧Second lens module
122‧‧‧第二影像感測器 122‧‧‧Second image sensor
123‧‧‧第二對焦裝置 123‧‧‧Second focusing device
1131‧‧‧第一對焦驅動電路 1131‧‧‧First focus drive circuit
1132‧‧‧第一對焦致動器 1132‧‧‧First focus actuator
1231‧‧‧第二對焦驅動電路 1231‧‧‧Second focus drive circuit
1232‧‧‧第二對焦致動器 1232‧‧‧Second focus actuator
i1‧‧‧第一影像 I1‧‧‧ first image
i2‧‧‧第二影像 I2‧‧‧second image
p11‧‧‧第一光感應訊號 P11‧‧‧First light sensing signal
p12‧‧‧第二光感應訊號 P12‧‧‧Second light sensing signal
p21‧‧‧第三光感應訊號 P21‧‧‧ Third light sensing signal
p22‧‧‧第四光感應訊號 P22‧‧‧fourth optical sensing signal
f1‧‧‧第一對焦訊號 F1‧‧‧first focus signal
f2‧‧‧第二對焦訊號 F2‧‧‧second focus signal
Claims (8)
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| TW103130116A TWI537667B (en) | 2014-09-01 | 2014-09-01 | Image capturing device and auto-focus method thereof |
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| TW103130116A TWI537667B (en) | 2014-09-01 | 2014-09-01 | Image capturing device and auto-focus method thereof |
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| TW201610544A TW201610544A (en) | 2016-03-16 |
| TWI537667B true TWI537667B (en) | 2016-06-11 |
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| US10375286B2 (en) | 2017-04-26 | 2019-08-06 | Pegatron Corporation | Imaging device and imaging method |
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| US10375286B2 (en) | 2017-04-26 | 2019-08-06 | Pegatron Corporation | Imaging device and imaging method |
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