WO2005033763A1 - 撮影レンズ位置制御装置 - Google Patents
撮影レンズ位置制御装置 Download PDFInfo
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- WO2005033763A1 WO2005033763A1 PCT/JP2004/012826 JP2004012826W WO2005033763A1 WO 2005033763 A1 WO2005033763 A1 WO 2005033763A1 JP 2004012826 W JP2004012826 W JP 2004012826W WO 2005033763 A1 WO2005033763 A1 WO 2005033763A1
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- lens position
- frequency component
- information
- focus lens
- high frequency
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
- G02B7/365—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals by analysis of the spatial frequency components of the image
Definitions
- the present invention relates to control of a focus lens position of a digital camera, a digital video camera, and the like.
- a focus lens (hereinafter, a focus lens) is used.
- the lens for matching is called a focus lens) at a certain specific position
- the derivative of all the luminance values in the shooting area is calculated
- the sum of the derivative of this luminance value is calculated
- the derivative of this luminance value is calculated.
- a curve is created by associating the sum with the corresponding focus lens position (hereinafter, the position of the focused focus lens is referred to as the focus lens position), and the in-focus position is found from the maximum value of this curve. It is a thing. This is because, in general, when the subject is out of focus, the total sum of the differential values of the luminance values of the entire screen becomes small, and when the subject comes into focus, the total sum of the differential values of the luminance values becomes large. It is.
- the brightness value is sampled while rotating and moving the focus lens with fine pitch, and further, the brightness value is sampled in real time from the brightness value sampled for each focus lens position.
- a curve is obtained in which the sum of the derivative of the focus lens position and the brightness value is plotted.
- a point at which the curve becomes a maximum hereinafter, referred to as a peak point
- this technique also has a problem. That is, there may be multiple peaks in this curve.
- Patent Document 1 Although it is only an area that indicates the range for brightness calculation, two areas, a large frame area and a small frame area, are set in the shooting area, and the sum of the differential values of the brightness values of all pixels included in each area is calculated. Then, the curves corresponding to the large frame area and the small frame area are obtained by the same procedure as the above-described contrast detection method. The two curves are used to solve the problem described above.
- the shapes of the curves are different.
- the peak point is smaller in the small frame area.
- Patent Document 1 JP-A-3-256017
- an image in which the value of the contrast data is the highest that is, an image in which the sum of the differential values of the luminance values is the highest is not necessarily an image focused on what the photographer intended.
- the video that is shot there is a subject that contains many edge components such as a cage, pillars, and forests composed of many sticks behind him as a subject.
- the contrast data becomes large in the rear cage, etc., which has many edge components, the above contrast detection method focuses on the rear cage, etc., and the photographer really wants to shoot. There is a possibility that it is not clearly reflected. This is one point using contrast data This is because only the focused focus lens position has been determined.
- the photographing lens position control device of the present invention ultimately naturally determines the focus lens position at one point.
- High frequency component distribution information at a plurality of focus lens positions is stored. Then, by selecting information considered to have an optimum distribution from among a plurality of pieces of information regarding the held distribution, the focus lens position for photographing is controlled.
- the present invention is characterized in that a plurality of high-frequency component distribution information are selectively held and laid out for each peak focus lens position.
- a peak focus lens position information acquisition unit that acquires peak focus lens position information in a predetermined area within the frame, and a peak focus lens position information acquisition unit that acquires peak focus lens position information.
- the first storage unit stores the lens position information in association with the high frequency component distribution information at the focus lens position indicated by the peak focus lens position information, and the high frequency component distribution information stored in the first storage unit.
- a selection information acquisition unit that acquires selection information that is information indicating which one of the high-frequency component distribution information accumulated in the first accumulation unit is selected; and a photographing lens based on the selection information acquired by the selection information acquisition unit.
- a first photographing lens position control device comprising: a photographing lens position determining unit that determines a position.
- an imaging lens position control device as described below has been invented. That is, a video signal acquisition unit that acquires a video signal from a large frame area in the shooting area in association with the focus lens position, and a small frame area that is a part of the large frame area, and the video signal power in association with the focus lens position.
- a contrast information acquisition unit that acquires contrast information that is information indicating contrast; and peak focus lens position information that acquires peak focus lens position information that is information indicating a focus lens position at which the contrast shows a peak based on the contrast information.
- the first photographing lens position control device holding distribution information of a plurality of high-frequency components within a frame for each peak focus lens position, and automatically or manually selects one of the candidates.
- the photographing lens position can be determined by selecting the focus lens position in advance. For example, when the photographer places an object to be photographed at the center, the distribution information is used to set the position of the focus lens at which the high-frequency component is distributed more centrally as the photographing lens position. In this way, by holding a plurality of candidate distribution information for each peak focus lens position and making it selectable, even if there is a strong edge component and a subject in addition to the subject captured in the frame and the subject. This makes it possible to focus and focus on the subject being photographed and the subject.
- the second photographing lens position control device it is possible to improve the accuracy of the focusing process in order to set the focusing lens position in focus in the small frame area as the photographing lens position.
- the processing load was heavy to find the focus lens position that can be expected and that is in focus in both the large frame area and the small frame area.However, the focus lens position that is in focus in the small frame area is determined by the photographing lens position. Because of this, the processing load is reduced, focusing is quicker, and the focusing time is shortened.
- the camera of the present invention includes not only a camera that shoots a still image, but also a general shooting device that focuses using a lens, such as a video camera that shoots a moving image.
- the present invention is not limited to these embodiments and can be implemented in various modes without departing from the scope of the invention.
- the first embodiment will mainly describe claims 1, 11, 12, 13, and 14.
- the second embodiment mainly describes claims 2, 3, 4, 5, 6, 7, 8, and 9.
- the third embodiment will mainly describe Claims 10, 11, 12, 13, and 15.
- a description will be given of the first photographing lens position control device.
- the fourth embodiment will mainly describe claim 16 and the like.
- the fifth embodiment mainly describes claim 17 and the like.
- Embodiment 6 mainly describes claims 18 and 19 and the like.
- Embodiment 7 mainly describes claim 20 and the like.
- Embodiment 8 mainly describes claim 21 and the like.
- the ninth embodiment will mainly describe claim 22 and the like.
- the tenth embodiment will mainly describe Claim 23 and the like.
- the eleventh embodiment will mainly describe claim 24 and the like.
- Embodiment 12 mainly describes claim 25 and the like.
- Embodiment 13 mainly describes claim 26 and the like.
- the second imaging lens position control device will be described.
- the first photographing lens position control device will be described below with reference to examples.
- FIG. 1 shows a photograph (a) focused and photographed by a photographing lens position control device of the present example and a conventional autofocus.
- FIG. 7B is a diagram showing a photograph (b) in which a mechanism focuses on an incorrect object not intended by the photographer.
- the photographing lens position control device of this embodiment allows the photographer to take a photograph that the photographer wants to photograph, such as the photograph in FIG. As in the case of a), it is possible to take a photograph in which the desired subject is firmly focused.
- FIG. 2 is a diagram illustrating functional blocks of the photographing lens position control device of the present embodiment.
- the photographing lens position control device (0200) of the present embodiment performs control for focusing based on the distribution of the high frequency components of the video signal in the frame, which is obtained according to the focus lens position.
- Lens position determining unit (0204).
- the "video signal” means that the lens is captured by the first photographing lens position control device. These signals indicate the color and brightness generated by camera devices such as CCDs, CMOS imagers, and color filters that convert the intensity of light into electrical signals.
- This video signal is, for example, a YUV signal that represents a color with three pieces of information: a luminance signal (Y), a difference between the luminance signal and the blue component (U), and a difference between the luminance signal and the red component (V).
- RGB signals that represent signals and colors as a combination of the three primary colors of red (R), green (G), and blue (B), and complementary colors such as Cyan (indigo), Magenta (red), Yellow (yellow), Green (CMYG) signal indicating four colors.
- the video signal is obtained by using a device such as a CCD or a CMOS imager as described above, and a photodiode or the like measures the light intensity at each pixel of the subject, such as a luminance signal (Y). This is done by converting it to a video signal and acquiring it.
- the “high-frequency component” of the video signal is a component that takes a value equal to or greater than a predetermined value when the video signal is represented by a frequency, and is obtained, for example, by passing the video signal through a band-pass filter. .
- the reason why the distribution of the high frequency component is obtained in this manner is as follows.
- the contrast is strong in order to accurately represent the details of the subject.
- a waveform with a short wavelength is required to approximate this, that is, a high-frequency component is required.
- the image becomes blurred as a whole, so that it has a long wavelength waveform, that is, a low frequency component. Therefore, if only the high-frequency component of the video signal is extracted through the band-pass filter and the above-mentioned curve is obtained using only this high-frequency component, a curve in which the peak point clearly appears can be obtained. In other words, by adopting the high frequency component of the video signal, it can be said that a curve with sharper focusing can be obtained.
- the degree of contrast of the shooting region can be indicated by the integrated value of the high-frequency component in the frame. Therefore, the integral value of the high-frequency component of the video signal is an example of information indicating a contrast in a frame described later.
- the "focus lens” is a lens group that moves the position of the camera in order to focus on the subject. Is also good.
- “Focus lens position” refers to the position The position of the focus lens in the camera, for example, the number of pulses and the number of rotations of the motor include information represented by numerical values such as the actual moving distance of the lens.
- the term “frame” refers to a region where a video signal is acquired for photographing, and is substantially synonymous with the “photographing region” in the second photographing lens position control device.
- the “peak focus lens position information acquisition unit” (0201) has a function of acquiring peak focus lens position information.
- Peak focus lens position information refers to a focus lens position at which the integrated value of the high-frequency component in a predetermined area in the frame (of course, the predetermined area may be the same as the frame) has a peak.
- FIG. 3 is a diagram for explaining an example of a flow of obtaining the peak focus lens position information.
- This figure shows a method of Fourier transforming and processing a luminance signal of a pixel as a frequency component.
- a luminance signal which is a video signal
- an image sensor such as a CCD
- a video signal and a luminance signal acquired by the CCD are extracted as frequency components by a frequency extraction circuit (indicated by 1 in FIG. 3. The same applies hereinafter).
- a Fourier transform circuit Fourier-transforms the frequency component of the luminance signal (2).
- the Fourier-transformed luminance signal is passed through a band-pass filter (3), and the high-frequency component of the frequency component is extracted (4). Then, the integrated value in the range (vertical line portion) extracted by the range integrated value calculating circuit is obtained (5), and the integrated value is plotted in association with the lens position (6).
- the integrated value has a peak at two positions: a focus lens position at which the person in front is in focus and a focus lens position ⁇ at which the back house is in focus.
- the focus lens position at which the integrated value becomes the maximum value is defined as the photographing lens position, and thus the focus lens position focused on the house behind may be determined.
- the focus lens position information regarding both peak points is obtained by the peak focus lens position information acquisition unit. It can be acquired and automatically or arbitrarily selectable (because it is stored in association with high-frequency component distribution information described later).
- the "first accumulation unit” (0202) includes the peak focus lens position information acquired by the peak focus lens position information acquisition unit (0201), and the high frequency at the focus lens position indicated by the peak focus lens position information. It has a function to accumulate and store component distribution information.
- “High-frequency component distribution information” refers to information indicating the distribution of high-frequency components, such as information indicating the position of a pixel in an image frame (an identification number uniquely assigned to a pixel, or a vertical or horizontal pixel at which the pixel is located). Number) and the value of the strength of the high frequency component of the video signal.
- the distribution state of the high frequency component at each peak focus lens position that is, the contrast of the frame within the frame is reduced.
- the distribution state can be determined.
- selection information acquisition unit (0203) has a function of acquiring selection information based on the high frequency component distribution information accumulated in the first accumulation unit (0202).
- Selection information is information that is automatically generated or arbitrarily selected by a photographer or the like to determine a photographing lens position that is a focus lens position suitable for photographing, and is, for example, stored in the first storage unit. Information indicating which force is selected from the high frequency component distribution information. Alternatively, information having the same meaning, for example, information indicating the position of the selected focus lens, information for identifying the information, and the like can also be given. Note that acquisition of selection information includes generation of selection information as described later.
- the above-mentioned peak focus lens position information acquisition unit acquires two points of peak focus lens position information. Then, the high frequency component distribution information at the two points is stored in the first storage unit in association with each peak focus lens position. Therefore, the selection processing is performed based on the high-frequency component distribution information accumulated in the first accumulation unit.
- the selection may be obtained by being input manually. Alternatively, the selection may be made automatically by the machine. The selection by this machine is determined by a determination mechanism of the photographing lens position control device itself of this embodiment, for example.
- the selection information acquisition unit Connected to another computer or camera via an Internet network or cable, etc., and some information to select from there (for example, distance information on the distance measuring device power or weather from a server on the Internet). Information, etc.).
- the other example of the selection information acquisition by the selection information acquisition unit will be described in the second embodiment, including the acquisition by generation.
- the “photographing lens position determination unit” (0204) is associated with the high frequency component distribution information indicating that the selection has been made by the selection information obtained by the selection information obtaining unit (0203), and is stored in the first storage unit. It has the function of determining the position of the taking lens based on the accumulated peak focus lens position information. As described above, the selection information is obtained based on the high-frequency component distribution information, and the position of the photographing lens is determined based on the selection information, so that the focus at which the subject desired by the photographer is located is located. The lens position can be determined.
- the “photographing lens position” refers to a focus lens position suitable for photographing, and is synonymous with the “photographing focus lens position control device” of the second photographing lens position control device.
- a luminance signal is used as a video signal. This is because the luminance signal is considered to be a signal in which the peak of the integrated value appears most frequently.
- a color signal represented by RGB or a CMYG signal may be used as the video signal as described above.
- FIG. 4 is a diagram for explaining CMYG signals.
- Cyan (indigo) is Blue-Green
- Magenta (red) is Red-Blue
- Yellow (yellow) is Green_Red.
- each color can be subtracted (subtracted) from the combination of the three colors of CMY plus Green (green) to determine RGB.
- Red Yellow-Green
- Complementary color CCDs for acquiring CMYG signals and performing photographing have good sensitivity to light, so they are sometimes used in digital cameras that value sensitivity. Therefore, The present invention also assumes that this CMYG signal is obtained as a video signal.
- FIG. 5 is a flowchart illustrating an example of a processing flow of the present embodiment.
- the following process flow can be implemented as a method, a program to be executed by a computer, or a readable recording medium on which the program is recorded.
- peak focus lens position information is obtained (step S0501).
- the peak focus lens position information acquired in step S0501 and the high frequency component distribution information at the focus lens position indicated by the peak focus lens position information are stored in association with each other (step S0502).
- selection information is obtained based on the high frequency component distribution information accumulated in step S0502 (step S0503).
- the photographing lens position is determined based on the selection information obtained in step S0503 (step S0504).
- the high frequency component distribution information at the peak focus lens position is stored in the first storage unit.
- other focuses other than the peak force lens position are used.
- the position of the focus lens can be determined according to more various situations, for example, a photograph that is entirely blurred (out of focus) or a photograph that focuses only on a subject far away from the corner of the screen.
- Second Embodiment (Concept of Second Embodiment)
- the selection information is generated by the selection information acquisition unit of the imaging lens position control device of the first embodiment described above. explain.
- the “selection information acquisition unit” includes “high frequency component index calculation means” and “high frequency component index dependent selection information generation means”. .
- the "high-frequency component index calculating means” has a function of calculating a high-frequency component index.
- the "high-frequency component index” indicates a distribution of high-frequency components in relation to a predetermined position in the frame, and is, for example, a value related to a distance from the predetermined position (for example, a value of the distance minus the first power). And the value of the strength of the high-frequency component at that position (for example, a value indicating the magnitude of the high-frequency component). Therefore, for example, if the distance from the center of the image, which is a predetermined position, and the strength of the high-frequency component at that distance are known, the high-frequency component is often located near the center of the image, or at a portion far from the center. It is possible to judge the state such as high frequency components. Then, the “high-frequency component index dependent selection information generating means” generates selection information based on the high-frequency component index. Hereinafter, an example of generation of this selection information will be described.
- the high frequency component index calculating means has a scanning device.
- the “scanner” has a function of scanning the intensity of the high-frequency component with a predetermined position in the frame as a scan start position. Then, as shown in FIG. 6, if the “center point of the frame” is set as the predetermined position as the scanning start position, for example, the scanner acquires the high-frequency component distribution information spirally from the center point. This makes it possible to calculate the high frequency component index from the center point, and to know the distribution state of the high frequency component from the center point.
- the peak focus lens position having the large value is the focus lens position to be selected.
- an image in which the subject is focused and focused can be taken.
- a method may be adopted in which the scanning device sequentially scans from the upper left end in the frame as a predetermined position.
- the image sensor pixel
- the image sensor detects (outputs) a video signal acquired in a bucket brigade type for each line due to its structure. Good to adopt.
- the predetermined position that is, the position at which the scanner starts scanning (scanning start position) is set.
- the taking lens control device may have a “predetermined position setting unit” for setting.
- the predetermined position setting unit allows the photographer or the like to arbitrarily specify the scanning start position, whereby the photographing lens position control device of the present embodiment allows the photographer to select the subject at the position in the frame that matches the photographer's preference. Can be focused.
- the predetermined position setting unit includes a plurality of preset and prepared modes such as a “center focusing mode” and a “left end focusing mode”, which are set by the photographer by selecting a mode, The user operates the pointer on the display and specifies the pointer.
- the setting may be automatically performed by the microprocessor using stored data, setting conditions based on empirical rules, setting conditions that change due to weather, and the like.
- the high frequency component index calculation unit calculates the integration amount increase information.
- “Integration amount increase information” refers to information indicating, as a high frequency component index, an increase in the integral value of the high frequency component of the video signal along the scanning path of the scanner, such as the slope of the integral value of the high frequency component of the video signal. Is mentioned.
- the high frequency component index dependent selection information generating means is characterized by generating selection information for selecting high frequency component distribution information having the largest increase in the integrated value based on the integration amount increase information.
- FIG. 7 is a diagram showing an example of this integration amount increase information.
- the inclination of the graph (the amount of change in the integrated value) is large. That is, as the scanning position moves away from the center, which is a predetermined position, for example, the integration of the high-frequency component is performed. The value of the value has also increased significantly.
- the inclination of the graph is small (compared to X), that is, as the scanning position moves away from the center, the value of the integrated value of the high-frequency component increases only small. This is also performed at other focus lens positions, and the one with the largest increase is generated as selection information.
- scanning amount information refers to information indicating the amount of scanning by the scanning device until the maximum value of the high frequency component of the video signal appears.For example, the maximum value of the high frequency component of the video signal appears. The value of the number of pixels scanned before scanning is performed.
- FIG. 8 is a diagram showing running amount information in an image at a focus lens position where a person to be photographed is focused.
- the relationship between the amount of scanning and the strength of the high-frequency component is represented by a graph shown in the figure below.
- FIG. 9 is a diagram showing travel distance information in an image at a focus lens position where a house that is not a target to be focused is focused.
- the relationship between the scanning amount and the strength of the high-frequency component is represented by a graph shown in the following figure.
- the contrast is strong, that is, the high-frequency component appears strongly in the object portion (image portion) where the focus is in focus and the edge component is strong.
- the maximum value of the high-frequency component appears earlier, that is, at a stage where the scanning amount is small. Therefore, also in this generation example, it is possible to generate the selection information for determining the focus lens position focused on an object close to the predetermined position.
- a predetermined position which is the scanning start position may be set at the upper left end.
- the maximum value is determined in advance by setting the maximum value to an appropriate value derived from empirical rules, or by once scanning the entire frame and knowing the maximum value based on the result. get.
- the high-frequency component index is the center-of-gravity deviation information
- the “high-frequency component index-dependent selection information generating means” determines that the center-of-gravity deviation information has the smallest value. Generating selection information for selecting high-frequency component distribution information indicating the following.
- the “center-of-gravity deviation information” refers to information indicating the distance between the position of the center of gravity of a high-frequency component and a predetermined position.
- An example of calculating the center-of-gravity deviation information is that the value Pi indicating the direction of each point (pixel) is This is a method in which the integral value of (Mi X Pi) is divided by the integral value of Mi as the value Mi indicating the value.
- FIG. 10 is a diagram showing the distance between the position of the center of gravity of the high-frequency component and a predetermined position.
- the center of gravity of the image is the position indicated by the point bl in FIG. 10 (1).
- the position of the center of gravity is the position shown by point b2 in Fig. 10 (2). Therefore, if the predetermined position is the center point a, the barycenter deviation information indicating the distance between a_b shows a smaller value in FIG. 10 (1). Therefore, also in this generation example, it is possible to generate selection information for determining a focus lens position focused on an object close to a predetermined position.
- a desired focus lens position is selected by presenting an image at each focus lens position to a photographer or the like as an operator. And obtain the selection information.
- the selection information acquisition unit has “high-frequency component distribution image display means” that displays the high-frequency component distribution information stored in the first storage unit as an image. Then, at the "selection input means", the selection information is obtained from the operator based on the high frequency component distribution image displayed on the high frequency component distribution image display means.
- FIG. 11 is a diagram illustrating an example in which the high frequency component distribution information stored in the first storage unit is displayed as an image.
- a binarized image obtained by inversely calculating the magnitude of the high-frequency component for each position in a predetermined area in the frame indicated by the high-frequency component distribution information at various focus lens positions is converted to a high-frequency image. It is displayed on the liquid crystal display of the camera, which is the component distribution image display means. The photographer looks at this image and inputs (a) if he wants to focus on the person and (b) if he wants to focus on the house into the selection input means. This allows the photographer to visually judge the focus state of the focus lens position and select a desired focus lens position.
- the displayed image may not be a binarized image but may be an image in which the same color expression as that actually taken is performed.
- the high frequency component distribution information can be realized by including and storing the color information at each position. Therefore, by using this acquisition example, it is easy to take a photograph in which the focus is defocused easily, and it is possible to provide a function not available in the conventional autofocus camera. (Brief Description of Effect of Second Embodiment) As described above, selection information can be generated and obtained by various means, and therefore, imaging suited to various needs and situations becomes possible. .
- the imaging lens position control device of Embodiment 1 uses the information indicating the distribution of the high-frequency component according to the position in the frame, that is, the two-dimensional information.
- the information indicating the distribution of high frequency components in relation to a predetermined position in the frame, that is, the high frequency component index, which is one-dimensional information is stored, thereby reducing the amount of storage memory. It is further characterized by having a function of performing In the first embodiment, it is necessary to accumulate high frequency component distribution information at a plurality of peak focus lens positions or predetermined predetermined focus lens positions for comparison. Therefore, the amount of memory is cumulatively increased. By reducing the amount of stored memory, it is possible to reduce the size, weight, and cost of the device.
- FIG. 12 is a diagram illustrating functional blocks of the photographing lens position control device of the present embodiment.
- the photographing lens position control device (1200) of the present embodiment includes a “peak focus lens position information acquisition unit” (1201), a “high frequency component index calculation unit” (1202), and a “ It has a “two storage units” (1203), a “selection information acquisition unit” (1204), and a “photographing lens position determination unit” (1205).
- the “peak focus lens position information acquisition unit” (1201), the “selection information acquisition unit” (1204), and the “photographing lens position determination unit” (12005) have already been described in the first embodiment. Therefore, the description is omitted.
- the “high-frequency component index calculation unit” (1202) is the same as that described in the second embodiment, and the “second storage unit” (1203) is the first storage unit described in the first embodiment. It has a function of storing the high frequency component index calculated by the high frequency component index calculation unit in association with the peak focus lens position, instead of the high frequency component distribution information in step (1).
- FIG. 13 is a graph showing an example of the relationship between the high-frequency component index stored in the second storage unit and the position of the peak focus lens. As described above, the high-frequency component index draws a peak when being focused on some subject, and the high-frequency component index indicating the peak is acquired as selection information by, for example, the selection information acquisition unit.
- FIG. 14 shows an example of the processing flow of the third embodiment.
- FIG. 14 shows an example of the processing flow of the third embodiment.
- peak focus lens position information is obtained (step S1401). Further, a high frequency component index is calculated (step S1402).
- the peak focus lens position information obtained in step S1401 and the high frequency component index calculated in step S1402 are stored in association with the focus lens position indicated by the peak focus lens position information. (Step S1403).
- selection information is obtained based on the high frequency component index accumulated in step S1403 (step S1404).
- the photographing lens position is determined based on the selection information acquired in step S1404 (step S1405).
- the imaging lens position control device of the third embodiment reduces the amount of storage memory by storing high-frequency component indexes that are one-dimensional information. Therefore, for example, it is possible to reduce the size and weight of the device, reduce the cost, and the like.
- the first photographing lens position control device has been described above.
- FIGS. 15 and 16 are diagrams showing the concept of the present example.
- the present embodiment relates to an autofocus technique for focusing on a video camera or the like.
- FIG. 16 shows a curve indicating the relationship between the sum of the differentials of the luminance values of the video signal and the focus lens position.
- the curve (a) that represents the sum of the differential brightness values is three. It has peaks at some places.
- the curve (c) representing the sum of the differentials of the luminance values is obtained. Also has only one peak.
- the differentiation of the luminance value may be a difference between the luminance values.
- FIG. 17 is a functional block diagram of the photographing lens position control device according to the present embodiment.
- the “large frame area” is a part of the photographing area, and there is a “small frame area” as a part of the large frame area. Further, the shape of the large frame area and the small frame area is not limited to a rectangle, a square, a circle, or the like.
- the “video signal acquisition unit” has a function of acquiring a video signal from a large frame area in a shooting area and a small frame area that is a part of the large frame area in association with the focus lens position.
- “Focus lens” refers to a lens used for focusing, like the focus lens in the first photographing lens position control device, and “focus lens position” Similarly, it refers to the position of a focus lens in a shooting mechanism such as a video camera or a digital camera as a shooting device.
- the video signal is associated with the focus lens position.
- the "contrast information acquisition unit” has a function of acquiring contrast information, which is information indicating contrast, in association with the focus lens position from the video signal.
- “Contrast information” is information indicating contrast.
- the contrast information includes, as described below, “information consisting of a video signal obtained by CCD”, “information consisting of the result of Fourier transform of the video signal”, and “information consisting of the result of Fourier transform thereof”. This is a concept that can include any of “information obtained through a band-pass filter” and “a predetermined integration result of information obtained through the band-pass filter”.
- “Acquiring contrast information” refers to acquiring information indicating contrast.
- the acquisition process is, for example, after performing a Fourier transform (2 in FIG. 18) on the video signal (1 in FIG. 18) acquired by the video signal acquisition unit, and using a bandpass filter. Only the high-frequency component is extracted (3 in Fig. 18), and the integrated value of this high-frequency component (4 in Fig. 18) is taken as the horizontal axis of the focus lens position and the integrated value of the high-frequency component corresponding to the vertical axis By plotting (5 in Fig. 19), it is possible to obtain contrast information.
- the video signal before the Fourier transform may be a "processed video signal” created from a difference between values of the video signal between adjacent pixels.
- the reason for this is that the “processed video signal” generally tends to extract the edges of the subject more easily than the “unprocessed video signal”.
- the edge of the subject is an outline.
- the luminance value of most images changes rapidly, that is, the differential of the luminance value increases.
- the focus is determined when the differential value is maximized at the outline. May be.
- the contour and the position of the subject are not equal, they can be considered to be almost equal. Therefore, when it is determined that the subject is in focus at the outline, it is considered that the subject is also in focus. Therefore, the signal before performing the Fourier transform may be a “processed video signal”.
- Another method of acquiring contrast information is to calculate the difference between the luminance values of adjacent pixels, and calculate the difference between the focus lens position and the sum of the differences between the luminance values in each region in each of the small frame region and the large frame region. Seeking a relationship.
- the peak point can also be obtained from the curve obtained by such processing.
- a curve having more distinct peak points can be obtained by determining a threshold value and calculating the sum in each region only for a difference in luminance value larger than the threshold value. This is because the brightness value of the contour portion of the subject changes greatly, so that the difference between the brightness values increases. If only the difference of the luminance value larger than this is adopted by using the appropriately specified threshold value, only the information on the difference of the luminance value regarding this contour portion is extracted. In general, if the subject is in focus at the contour, the subject will also be in focus.Accordingly, the information on the sum of the differences in the luminance values of the contour is acquired to obtain contrast information. Can be.
- the “peak focus lens position information acquisition section” has a function of acquiring peak focus lens position information, similarly to the peak focus lens position information acquisition section in the first photographing lens position control device.
- Peak focus lens position information refers to the Information indicating the focus lens position where the contrast shows a peak according to the trust information
- peak focus lens position information information indicating the focus lens positions corresponding to peak 1, peak 2, and peak 3 is called peak focus lens position information.
- the “photographing focus lens position determining unit” determines the photographing focus lens position.
- the shooting focus lens position is a focus lens position suitable for shooting. That is, when the peak focus lens position information is obtained in the small frame area, the photographing focus lens position is determined based on the peak focus lens position information, and the peak focus lens position is determined in the small frame area. In the case where information is not obtained, a function is provided for determining the photographing focus lens position based on the peak focus lens position information of the large frame area.
- the peak focus lens position information in the small frame region has priority over the peak focus lens position information in the large frame region.
- the peak focus lens position obtained based on the peak focus lens position information may be set as the shooting focus lens position. If there is a plurality of pieces of peak focus lens position information in the small frame area, the peak focus lens position obtained based on the foremost peak focus lens position information may be used as the shooting focus lens position. Also, if the peak focus lens position information cannot be obtained in the / J, frame area, that is, if the curve obtained from the association between the value of the contrast information and the focus lens position does not form a clear peak, Prioritize the peak focus lens position and determine the shooting focus lens position. When there is a plurality of pieces of peak focus lens position information in the large frame area, as an example, the peak focus lens position corresponding to a state where the image present in front of the image is in focus may be determined as the shooting focus lens position.
- FIG. 20 is a functional block diagram illustrating the present embodiment.
- the feature point is that the video signal is a luminance signal.
- the video signal acquiring unit, the contrast information acquiring unit, the peak focus lens position information acquiring unit, and the photographing focus lens position determining unit are basically the same as those of the fourth embodiment. Since the functions are common, detailed description is omitted.
- the “video signal” in this embodiment is a luminance signal as described above.
- the luminance signal is a luminance signal that is a component of the video signal.
- a derivative of a luminance signal value of an adjacent pixel is called a “processed luminance signal” and is included in the luminance signal.
- the present embodiment has an effect that the number of variations for obtaining the peak focus lens position increases.
- Embodiment 6 The present embodiment is mainly based on Embodiment 4, and the feature is that the video signal in Embodiment 4 is any one or a combination of two or more of RGB signals, or cm
- One or more of the YG signals is a combination.
- FIGS. 21 and 22 are functional block diagrams showing the present embodiment.
- the characteristic point is that the video signal is one of RGB signals (FIG. 21 (A)) or A point that is a combination of two or more, or a point that is a combination of any one or more of the CMYG signals (FIG. 22 (A)) can be given.
- the video signal acquisition unit, the contrast information acquisition unit, the peak focus lens position information acquisition unit, and the shooting focus lens position determination unit are basically the same as in the fourth embodiment. Since the functions are common, detailed description is omitted.
- the “RGB signals” are the respective signals of the three primary colors of red, green and blue, which are the three elements of the image signal.
- “One or more combinations of RGB signals” means a single signal of red, green, and blue, or a combination of two signals of red-green, red-blue, and blue-green, among the three primary colors, or It is a signal of a combination of the three primary colors of red, blue and green. In the case of the combination, weighting is performed on the value indicated by each signal, and the values are added together.
- CMYG signals are signals of four colors of cyan, magenta, yellow and green, which are complementary colors to RGB.
- One or more combinations of CMYG signals refers to a single signal of cyan, magenta, yellow, and green, or cyan magenta, cyan yellow, cyan green, magenta yellow, magenta green, and yellow among the above four colors. It is a signal of two combinations of green, three signals of cyan magenta yellow, cyan magenta green, cyan yellow green, and magenta yellow green, or a signal of four colors of cyan magenta yellow green. In the case of the combination, the values indicated by the respective signals are weighted and added.
- the feature point is that the small frame region described in Embodiment 4 is arranged at the center of the large frame region. I can raise the point.
- FIG. 23 is a conceptual diagram showing a small frame region and a large frame region of the present embodiment.
- the present embodiment is an imaging lens position control device including a video signal acquisition unit, a contrast information acquisition unit, a peak focus lens position information acquisition unit, and an imaging focus lens position determination unit.
- the feature point may be that the small frame area (2302) is located at the center of the large frame area (2301).
- the “small frame area” is located at the center of the large frame area.
- the small frame area is rectangular, and the intersection 2305 of the diagonal line 2303 is a force M and the center 2305 of the frame area. It is also assumed that the large area 2301 is rectangular, and the intersection 2305 of the diagonal 2304 is the center 2305 of the large area.
- the force small frame region is said to be at the center of the large frame region.
- this includes installation in the approximate center.
- the position of the large area is not defined here.
- the large frame area does not need to be at the center of the shooting area because the force existing in the shooting area is not necessarily defined as being at the center of the shooting area.
- the small frame area is not always located at the center of the shooting area.
- This embodiment is based on any one of the fourth to seventh embodiments, and the feature point is that an arrangement change unit that changes the arrangement of the small frame area and / or the large frame area is provided. The ability to raise further points S is possible.
- FIG. 24 is a diagram showing a combination of whether or not the arrangement of the small frame area and the large frame area is changed.
- the present embodiment is an imaging lens position control device including a video signal acquisition unit, a contrast information acquisition unit, a peak focus lens position information acquisition unit, and an imaging focus lens position determination unit.
- the feature point may include a point that further includes an arrangement changing unit that changes the arrangement of the small frame area and / or the large frame area.
- the arrangement change unit has a function of changing information for associating a video signal acquired from a CCD with a large frame area or a small frame area, for example.
- the area shape changing unit of the sixth embodiment is also specifically realized by the same function.
- the video signal acquisition unit, the contrast information acquisition unit, the peak focus lens position information acquisition unit, and the photographing focus lens position determination unit are basically the same as in the fourth embodiment. Since the functions are common, detailed description is omitted.
- the “arrangement changing unit” changes the arrangement of the small frame area and / or the large frame area.
- the case where the small frame region is fixed and the large frame region is variable includes the case where the small frame region is fixed in the photographing region and the case where the relative positional relationship with the large frame region is fixed. In other words, the position of the small frame area changes as the layout of the large frame area changes.
- the case 2406 where the small frame region is variable and the large frame region is fixed includes the case where the relative positional relationship between the small frame region and the large frame region is fixed. In other words, this includes the case where the position of the large frame area is also changed in arrangement with the change in arrangement of the small frame area.
- the large frame area may protrude from the shooting area.
- the protruding portion may be used. If the image is ignored, or if the image is outside the frame, return the large frame to the shooting area. It is possible. In this embodiment, the case where this is considered as exception processing is also included.
- the focus can be adjusted by changing the locations of the small frame area and the large frame area. To play.
- Example 9 This example is based on one of Example 7 and Example 8, and the feature point is the size or / and aspect ratio of the small frame area or / and large frame area. And a region shape changing unit for changing the shape.
- FIG. 25 is a conceptual diagram relating to the aspect ratio of the small frame region and the large frame region.
- the present embodiment is an imaging lens position control device including a video signal acquisition unit, a contrast information acquisition unit, a peak focus lens position information acquisition unit, and an imaging focus lens position determination unit.
- the feature point may include a point having a region shape changing unit for changing the size or / and the aspect ratio 2506 of the small frame region 2502 and / or the large frame region 2501.
- the video signal acquisition unit, the contrast information acquisition unit, the peak focus lens position information acquisition unit, and the photographing focus lens position determination unit are basically the same as in the fourth embodiment. Since the functions are common, detailed description is omitted.
- the “region shape changing unit” changes the size or / and aspect ratio of the small frame region and / or the large frame region.
- the parameters of the small frame area and the large frame area are not limited to the arrangement of the eighth embodiment. Further, there are two parameters of the size and the aspect ratio of each frame area. In the present embodiment, the size and the aspect ratio include a case where they are correlated with each other. For example, when the area is determined and the aspect ratio is determined.
- the small frame may exceed the large frame.
- a case is also included in which this is prohibited and a restriction is added so that the small frame does not exceed the large frame.
- the present embodiment includes a case where the small frame area and the large frame area can be freely determined without making such a restriction.
- Embodiment 10 is mainly based on any one of Embodiments 4 to 6, and is characterized in that a plurality of the small frame regions are arranged in one large frame region. Can be raised.
- FIG. 26 is a conceptual diagram of the present embodiment in which a plurality of small frame regions are arranged in a large frame region.
- the present embodiment is an imaging lens position control device including a video signal acquisition unit, a contrast information acquisition unit, a peak focus lens position information acquisition unit, and an imaging focus lens position determination unit.
- the feature point is that the small frame areas 2602 to 2609 are It is possible to point out a plurality of points arranged in the large frame area 2601 or the large frame area 2610.
- the video signal acquisition unit, the contrast information acquisition unit, the peak focus lens position information acquisition unit, and the photographing focus lens position determination unit are basically the same as those of the fourth embodiment. Since the functions are common, detailed description is omitted.
- a plurality of “small frame areas” are arranged in one large frame area. When a plurality of small frames are arranged, the aspect ratio, size, and arrangement of each small frame are free. In the present embodiment, a case where small frames having the same regular shape are arranged is also included.
- Example 10 can also be considered a different form of Example 9.
- Embodiment 11 The present embodiment is mainly based on Embodiment 10, and the feature point is that a plurality of the large frame regions of Embodiment 10 are arranged in a photographing region.
- FIG. 27 is a conceptual diagram illustrating an example of the shape of a large frame area arranged in the imaging area according to the present embodiment.
- the present embodiment is a photographing lens position control device including a video signal acquiring unit, a contrast information acquiring unit, a peak focus lens position information acquiring unit, and a photographing focus lens position determining unit.
- the feature point may be a point where a plurality of the large frame areas are arranged in the photographing area.
- the video signal acquisition unit, the contrast information acquisition unit, the peak focus lens position information acquisition unit, and the photographing focus lens position determination unit are basically the same as in Embodiment 4. Since the functions are common, detailed description is omitted.
- a plurality of “large frame areas” are arranged in the shooting area. The fact that a plurality of large frames are arranged means that various large frames are prepared. This configuration has the shape shown in Figure 27. Various things may be included.
- a large frame area 2701 having a large aspect ratio, a large frame area 2702 having a small aspect ratio, an elliptical large frame area 2703, a large frame area 2704 having a star shape, and the like are also included.
- a large frame region 2705 in which the large frame is annular and the center is missing is included.
- a large frame area divided into two areas is included.
- the present embodiment includes a case where the small frame area is not a part of the large frame area. In such a case, a case where a part of the small frame region overlaps the large frame region, and a case where the entire small frame region is not included in the large frame region are also included.
- Example 12 The present example includes the small frame region and a middle frame region included in the large frame region, and the acquisition unit, the high-frequency video signal extraction unit, and the integration signal generation unit
- the video signal of the middle frame area is processed in the same manner as the video signals of the small frame area and the large frame area, and the photographing focus lens position determination unit determines the priority of the photographing lens position determination in the small frame area, the middle frame area, , A photographing lens position control device that determines the order of large frame areas.
- FIG. 28 is a functional block diagram of the present embodiment.
- FIG. 29 is a conceptual diagram of the middle frame area.
- the “video signal acquisition unit” (2802), the “contrast information acquisition unit” (2803), the “peak focus lens position information acquisition unit” (2804), and the “ A camera lens position control device (2801) comprising: a force lens position determination unit (2805); a feature point having a middle frame area 2902; the acquisition unit; a high-frequency video signal extraction unit;
- the integration signal generation unit processes the video signal of the middle frame area 2902 in the same manner as the video signals of the small frame area 2903 and the large frame area 2901, and the shooting focus lens position determination unit 2805
- the point that the priority of the position determination is determined in the order of the small frame area 1103, the middle frame area 1102, and the large frame area 1101 can be given.
- the "middle frame area” includes the small frame area and is included in the large frame area. Also in the middle frame region, the acquisition unit, the high-frequency video signal extraction unit, and the integration signal generation unit process the video signal in the middle frame region in the same manner as the video signal in the small frame region and the large frame region. You.
- the imaging lens position determination unit determines the priority of determining the imaging lens position in the order of the small frame area, the middle frame area, and the large frame area.
- the middle frame area in the present embodiment can be defined as the limited case of the eighth embodiment. By using three stages, if the focus lens position cannot be calculated in the small frame area, the focus lens position is calculated in the middle frame area. Become. Further, the size of the middle frame, the arrangement of the middle frame, and the shape of the middle frame include various forms as described in the eleventh embodiment.
- the middle frame area is newly defined, and is used as an auxiliary when the small frame area is out of focus. This has the effect of facilitating alignment.
- Embodiment 13 The present embodiment is mainly based on Embodiment 12, and the feature point is that the above-described middle frame region is formed of a plurality of middle frame regions having a further inclusive relation.
- FIG. 30 is a conceptual diagram of a plurality of middle frame areas.
- the video signal acquiring unit, the contrast information acquiring unit, the peak focus lens position information acquiring unit, the photographing focus lens position determining unit, and the middle frame area further include an inclusion relationship.
- the acquisition unit, the high-frequency video signal extraction unit, and the integration signal generation unit are configured to convert the video signal of the middle frame region into the small frame region and the large frame region.
- a photographing lens position control device that processes in the same manner as a video signal, wherein the photographing lens position determining unit determines the priority of determining the photographing lens position in the order of a small frame region, a middle frame region, and a large frame region;
- the middle frame region 3002 can be given a point consisting of a plurality of middle frame regions 3003, 3004, 3005, and 3006 forces having an inclusion relation system as an example.
- the acquisition unit, the high-frequency video signal extraction unit, and the integration signal generation unit process the video signal in the middle frame region in the same manner as the video signal in the small frame region and the large frame region, and determine a photographic lens position determination unit. Since the functions are basically the same as those of the fourth, fifth, and tenth embodiments, detailed descriptions thereof are omitted.
- the “middle frame area” in the present embodiment includes a plurality of middle frame areas having an inclusive relation.
- a plurality of middle frames have an inclusive relation means that there are a plurality of middle frames that are part of a large frame, and the middle frame further has a middle frame as a part thereof.
- the middle frame has a middle frame in a part thereof and a small frame is included in a part of the n-th middle frame.
- the second photographing lens position control device has been described above.
- FIG. 1 is a diagram showing a photograph focused by a photographing lens position control device of Example 1 and a photograph focused by a conventional autofocus mechanism.
- FIG. 2 is a diagram illustrating functional blocks of a photographing lens position control device according to a first embodiment.
- FIG. 3 is a diagram for explaining an example of a flow of acquiring peak focus lens position information in a peak focus lens position information acquisition unit of the photographing lens position control device according to the first embodiment.
- FIG. 5 is a flowchart illustrating an example of a processing flow in the photographing lens position control device according to the first embodiment.
- FIG. 6 is a diagram for explaining the concept of a scanner of the photographing lens position control device according to the second embodiment.
- FIG. 7 is a diagram illustrating an example of integration amount increase information of the photographing lens position control device according to the second embodiment.
- FIG. 8 is a diagram showing scanning amount information in an image at a focus lens position where a person to be photographed is focused in Embodiment 2
- FIG. 9 is a diagram showing scanning amount information in an image at a force lens position where a house that is not a target to be focused is focused in the second embodiment.
- Garden 10 A diagram showing the distance between the position of the center of gravity of the high frequency component and the predetermined position in Embodiment 2.
- Garden 11 The image of the high frequency component distribution information accumulated in the first accumulation unit of the imaging lens position control device of Embodiment 2 Diagram showing an example to be displayed
- FIG. 15 is a conceptual diagram showing the relationship between a camera equipped with a photographing lens position control device of Embodiment 4 and a subject to be photographed.
- Garden 17 A diagram showing an example of a functional block in the photographing lens position control device of the fourth embodiment.
- Garden 18 A conceptual diagram up to acquisition of video signal strength and contrast information in the contrast information acquisition section of the photographing lens position control device of the fourth embodiment.
- FIG. 23 is a conceptual diagram showing a small frame area and a large frame area in the photographing lens position control device of the seventh embodiment.
- FIG. 24 is a diagram of an example of a combination of the presence or absence of a change in the arrangement of the small frame region and the large frame region in the photographing lens position control device according to the eighth embodiment.
- FIG. 25 Aspect ratio of the small frame area and the large frame area in the photographing lens position control device of the ninth embodiment
- FIG. 26 Conceptual diagram in which a plurality of small frame regions are arranged in a large frame region in the photographing lens position control device of the tenth embodiment.
- FIG. 27 is a conceptual diagram showing an example of a shape of a large frame region arranged in a photographing region in the photographing lens position control device of the embodiment 11
- FIG. 30 is a conceptual diagram of a plurality of middle frame regions in the photographing lens position control device according to the fourteenth embodiment.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/571,614 US20070109660A1 (en) | 2003-09-10 | 2004-09-03 | Imaging lens position control device |
JP2005514373A JP4764169B2 (ja) | 2003-09-10 | 2004-09-03 | 撮影レンズ位置制御装置 |
EP04772775A EP1669787A4 (en) | 2003-09-10 | 2004-09-03 | PICTURE LENS POSITION CONTROL DEVICE |
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JP2003-319084 | 2003-09-10 | ||
JP2003319084 | 2003-09-10 | ||
JP2003-333760 | 2003-09-25 | ||
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JP (1) | JP4764169B2 (ja) |
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JP2009069996A (ja) * | 2007-09-11 | 2009-04-02 | Sony Corp | 画像処理装置および画像処理方法、認識装置および認識方法、並びに、プログラム |
JP2013080248A (ja) * | 2012-12-13 | 2013-05-02 | Canon Inc | 撮像装置とその制御方法 |
WO2013153666A1 (ja) * | 2012-04-13 | 2013-10-17 | キヤノン株式会社 | 焦点調節装置及びそれを用いた撮像装置 |
JP2014149540A (ja) * | 2014-03-28 | 2014-08-21 | Canon Inc | 焦点調節装置、撮像装置、及びその制御方法 |
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JP5347717B2 (ja) * | 2008-08-06 | 2013-11-20 | ソニー株式会社 | 画像処理装置、および画像処理方法、並びにプログラム |
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JP5977591B2 (ja) * | 2012-06-20 | 2016-08-24 | オリンパス株式会社 | 画像処理装置及びそれを備えた撮像装置、画像処理方法、並びに画像処理プログラムを記録したコンピュータ読み取り可能な記録媒体 |
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JP2013080248A (ja) * | 2012-12-13 | 2013-05-02 | Canon Inc | 撮像装置とその制御方法 |
JP2014149540A (ja) * | 2014-03-28 | 2014-08-21 | Canon Inc | 焦点調節装置、撮像装置、及びその制御方法 |
Also Published As
Publication number | Publication date |
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KR20080000686A (ko) | 2008-01-02 |
KR20060058118A (ko) | 2006-05-29 |
EP1669787A1 (en) | 2006-06-14 |
JP4764169B2 (ja) | 2011-08-31 |
JPWO2005033763A1 (ja) | 2007-11-15 |
EP1669787A4 (en) | 2009-12-30 |
US20070109660A1 (en) | 2007-05-17 |
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