JP5794475B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus suitable for a so-called digital camera, digital video camera, or the like that captures still images, movie images, and the like using an imaging element.

In recent years, not only single-lens reflex cameras such as digital single-lens reflex (single-lens reflex) cameras, but also small single-lens digital cameras that do not use a reflex mirror such as a so-called microfour SARS (trademark: Olympus Imaging) system, The attention of interchangeable lens digital cameras is increasing. In an interchangeable lens digital camera, a user can enjoy photographing by attaching various interchangeable lenses to the camera body.
In the case of an interchangeable lens of the same standard as the camera body, recently, the camera body and the interchangeable lens each have an electrical contact, and the camera body acquires lens information from the interchangeable lens via the electrical contact, and is loaded. It is possible to perform control according to the state. On the other hand, electrical contacts are used for old lenses (old lenses) used in analog cameras, such as so-called silver-salt cameras that use conventional silver-halide films, and interchangeable lenses with different standard option specifications. There are things that do not have, and those that do not fit the camera body and contacts. When such an interchangeable lens is installed, the camera body cannot properly recognize what lens is attached, and adjustment control such as zoom, focus, and aperture of the lens is manually performed by the user. It is necessary to adjust by operation (manual operation). Even when autofocus is enabled, there is a case where it is desired to focus by manual operation without relying on autofocus.

Immediate focus adjustment is required for subjects that change from moment to moment, and as a general example, in order to check whether or not the subject is in focus, a part of the image is enlarged and focused. Techniques such as making it easier to confirm are taken.
For example, Patent Document 1 (Japanese Patent Laid-Open No. 2010-114556), Patent Document 2 (Japanese Patent Laid-Open No. 2010-16783), and Patent Document 3 (Japanese Patent Laid-Open No. 9-326025) include assistance in focus adjustment by manual operation. An example of a conventional technique that reflects the focus state of an image on a display, which can be used as the above, is disclosed.
That is, in Patent Document 1, in order to facilitate focus adjustment by manual operation and improve focusing accuracy, edge pixels corresponding to the edge portion of the preview image before actual photographing are highlighted or displayed. A technique for enlarging and displaying a part of a preview image displayed by highlighting the portion is disclosed.
In Patent Document 2, an edge component image obtained by extracting an edge component from a reproduced image is generated, the generated edge component image is superimposed on the original reproduced image, the edge portion is emphasized, and the display image is focused. A technique for easily understanding the state is disclosed.
In Patent Document 3, data obtained by measuring the distance between the camera and a plurality of areas of the subject at the time of shooting is recorded in association with an image, and if a certain distance is set as an extraction distance as desired, the extraction is performed. A technique for extracting a subject area corresponding to a distance and setting a background color other than the extracted area is disclosed. In this way, the region corresponding to the extraction distance can be made conspicuous on the image, or the image can be edited based on the region corresponding to the extraction distance.

As described above, for example, the conventional technology for reflecting the focus state of an image as disclosed in Patent Literature 1, Patent Literature 2, and Patent Literature 3 on the display is used as an assist for focus adjustment by manual operation. It is thought that you can. However, in either case, the edge part is simply extracted and displayed, or the image from which the edge part is extracted is superimposed and displayed on the original image, or the edge part of the image in which the edge part is emphasized is enlarged and displayed. A region corresponding to a specific extraction distance in an image, or an editing process is applied to a region corresponding to a specific extraction distance in an image. It could not be expressed sufficiently, and focus adjustment was not so easy.
The present invention has been made in view of the above-described circumstances, and can be effectively used as a through image for confirming a subject composition before photographing as an electronic viewfinder, and easily and effectively while viewing the image. An object of the present invention is to provide an imaging apparatus capable of performing focus adjustment.

In order to achieve the above-described object, an imaging apparatus according to the present invention provides
An imaging lens for forming a subject optical image;
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
An image display device for displaying an image obtained through the image processing means,
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
Display processing means for supplying an edge extraction image whose background color has been changed by the background color changing means to the image display means;
Ri name with a,
The imaging lens is detachable, and is configured as an interchangeable lens that is selectively loaded with a plurality of imaging lenses.
The imaging device includes means for determining the type of the interchangeable lens, and
The background color changing means is means for presetting a background color corresponding to each photographing lens in the interchangeable lens as the preset condition and changing the background color corresponding to the replacement of the photographing lens. It is characterized by that.

According to the present invention, the electronic viewfinder can be effectively used for a through image for confirming a subject composition before shooting, and it is possible to easily and effectively perform a focus adjustment while viewing the image. An imaging device can be provided. That is, according to the imaging apparatus of the present invention,
An imaging lens for forming a subject optical image;
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
An image display device for displaying an image obtained through the image processing means,
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
Display processing means for supplying an edge extraction image whose background color has been changed by the background color changing means to the image display means;
Ri name with a,
The imaging lens is detachable, and is configured as an interchangeable lens that is selectively loaded with a plurality of imaging lenses.
The imaging device includes means for determining the type of the interchangeable lens, and
The background color changing means is means for presetting a background color corresponding to each photographing lens in the interchangeable lens as the preset condition and changing the background color corresponding to the replacement of the photographing lens. by, it can be performed easily and efficiently focus adjustment while viewing the image and Do Ri,
In particular, by changing the background color according to the interchangeable lens loaded at the time of lens replacement, it is possible to set a suitable background color depending on the lens characteristics, or to set the background color by color classification for each lens. Thus, it is possible to recognize which interchangeable lens is mounted by looking at the background color in the edge extraction mode.

It is a block diagram which shows the electromechanical system structure of the principal part of the control system of the digital camera which concerns on one embodiment of the imaging device of this invention. It is a top view which shows typically the state which looked at the external appearance structure of the digital camera of FIG. 1 from the upper surface side. FIG. 2 is a front view schematically showing a state in which the external configuration of the digital camera of FIG. 1 is viewed from the front subject side. It is a rear view which shows typically the state which looked at the external appearance structure of the digital camera of FIG. 1 from the back surface photographer side. 2 is a flowchart showing basic image processing in the digital camera of FIG. 1. FIG. 3 is a gamma correction characteristic diagram showing a gamma correction curve with the horizontal axis as an input signal and the vertical axis as an output signal for explaining the gamma correction processing in the digital camera of FIG. 1. In order to explain the gamma correction processing in the digital camera of FIG. 1, the output characteristics with respect to the input in a general image display output apparatus are shown as input / output characteristics with the horizontal axis representing the input signal and the vertical axis representing the output signal. FIG. 2 is a CbCr color space diagram showing color correction in a color space in order to explain color correction processing in the digital camera of FIG. 1. It is a principle block diagram for demonstrating the edge emphasis process in the digital camera of FIG. 6 is a flowchart for explaining background color change processing in an edge extraction mode in the digital camera of FIG. 1. FIG. 10 is a diagram illustrating an example of characteristics of a low-pass filter used in the edge enhancement processing of FIG. 9 in the digital camera of FIG. 1, (a) is a low-pass filter characteristic during normal through image display, and (b) is edge extraction. It is a figure which shows the low-pass filter characteristic at the time of a mode, respectively. FIG. 2 is a diagram illustrating an example of a display image by edge enhancement processing in the digital camera of FIG. 1, (a) is a display image during normal through image display, and (b) is an edge extraction image in edge extraction mode. It is a figure which shows a display image, respectively. A color correction process for outputting a color difference signal obtained by performing a color correction process on the input color difference signal in the color correction process in the digital camera of FIG. 1 and a color fixing process for outputting a constant color difference signal regardless of the input color difference signal are selected. It is a principle block diagram for demonstrating the process which can be applied in general. It is a figure which shows an example of the background color setting screen for setting the background color in the edge extraction mode of the digital camera of FIG. It is a figure which shows an example of the background color change condition setting screen for setting the conditions which change the background color in the edge extraction mode of the digital camera of FIG. It is a schematic diagram for demonstrating the process which changes a background color corresponding to the level (peak value or average value) of the edge extraction result in edge extraction mode of the digital camera of FIG.

Hereinafter, embodiments of an imaging apparatus according to the present invention will be described in detail with reference to the drawings.
Here, an embodiment of a digital camera as an imaging device will be described, but the present invention is not limited to this, and an image for processing an image related to an electronic device having a camera function or an imaging device is described. The present invention can be applied to general image processing such as a processing IC (integrated circuit) and image processing software.
1 to 4 show a basic configuration of a digital camera as an imaging apparatus according to an embodiment of the present invention. FIG. 1 is a block diagram schematically showing an outline of a system configuration of a control system of a digital camera. FIG. 2 is a schematic plan view of the external configuration of the digital camera of FIG. 1 as viewed from above. FIG. 3 is a schematic view of the external configuration of the digital camera of FIG. FIG. 4 is a schematic rear view of the external configuration of the digital camera of FIG. 1 as viewed from the rear photographer side.
As shown in FIGS. 2 to 4, the digital camera shown in FIGS. 1 to 4 has a sub liquid crystal display (sub LCD) 1, a release button 2, a mode switching dial 3, an optical viewfinder 4, and a strobe light emission. Unit 5, remote control light receiving unit (remote control light receiving unit) 6, lens mount 7, autofocus display light emitting diode (AF display LED) 8, strobe display light emitting diode (strobe display LED) 9, liquid crystal display monitor (LCD monitor) 10, A wide-angle (WIDE) zoom button 11, a telephoto (TELE) zoom button 12, a power switch 13, an operation button group 14, a memory card storage unit 15, a distance measuring unit 16, an electrical contact 17 and a lens unit 18 are provided. .

  Further, the digital camera shown in FIGS. 1 to 4 has the above-described sub LCD 1, strobe light emitting unit 5, remote control light receiving unit 6, lens mount 7, AF as shown in FIG. 1 mainly showing a system configuration related to electronic control. In addition to the display LED 8, the strobe display LED 9, and the LCD monitor 10, the image sensor 101, the front end unit (F / E unit) 102, the SDRAM (synchronous dynamic random access memory) 103, the camera processor 104, and the RAM (random access) Memory) 107, ROM (Read Only Memory) 108, Sub CPU (Sub Central Processing Unit) 109, Operation Unit 110, Sub LCD Driver 111, Buzzer 113, Strobe Circuit 114, Audio Recording Unit 115, Audio Playback Unit 116, LCD Driver 117, video amplifier (bidet Amplifier) 118, a video connector 119, internal memory 120, a memory card slot 121, USB (Universal Serial Bus) connector 122 and a serial interface unit 123.

Although not clearly illustrated, the lens mount 7 includes a zoom optical system including a zoom lens system and a zoom motor, a focus optical system including a focus lens system and a focus motor, and a lens including a diaphragm unit including a diaphragm and a diaphragm motor. The unit 18 is detachably mounted. The camera body in the vicinity of the lens mount 7 has a shutter unit including a shutter 19-1a and a shutter motor 19-1, and a motor driver 19-2, and an electrical contact 17 provided on the lens mount 7 is provided. Lens information is obtained from the lens unit 18 mounted on the lens mount 7, and zoom, focus, and aperture drive signals from the motor driver 19-2 are supplied to the lens unit 18, respectively. And drive the aperture motor. The shutter motor 19-1 is driven by a motor driver 19-2.
The front end unit 102 includes a CDS (correlated double sampling unit) 102-1, an AGC (automatic gain control unit) 102-2, an A / D (analog-digital) conversion unit 102-3, and a TG (timing generator) 102-. 4.

The camera processor 104 includes a first imaging signal processing block 104-1, a second imaging signal processing block 104-2, a CPU (central processing unit) block 104-3, and a local SRAM (local static random access memory) 104-4. USB processing block 104-5, serial processing block 104-6, JPEG codec (CODEC) block 104-7, resizing block 104-8, video signal display block 104-9 and memory card controller block 104-10 Have.
The operation unit 110 includes a release button 2, a mode switching dial 3 shown in FIGS. 2 and 3, a WIDE zoom button 11, a TELE zoom button 12, a power switch 13, and an operation button group 14 shown in FIG. 4.
The audio recording unit 115 shown in FIG. 1 has an audio recording circuit 115-1, a microphone amplifier (microphone amplifier) 115-2, and a microphone (microphone) 115-3. The audio reproduction unit 116 is an audio reproduction circuit 116. -1, an audio amplifier (audio amplifier) 116-2 and a speaker 116-3. The serial interface unit 123 includes a serial driver circuit 123-1 and a serial connector 123-2.

As shown in FIG. 2, the sub LCD 1, the release button 2, and the mode switching dial 3 are arranged on the upper surface of the camera body. The sub LCD 1 is used as a display unit for displaying, for example, the number of shootable images. The release button 2 can be pressed in two stages, and an automatic focusing (AF) operation can be performed by pressing the first stage, and a shooting operation can be performed by pressing the second stage. In general, pressing the first step is referred to as “half pressing”, and pressing the second step is referred to as “full pressing”. The mode switching dial 3 switches the operation mode of the digital camera such as a shooting mode and a playback mode by the operation.
Further, as shown in FIG. 3, the objective surface of the optical viewfinder 4, the strobe light emitting unit 5, the remote control light receiving unit 6, the lens mount 7 and the distance measuring unit 16 are arranged on the front side of the camera body. A memory card storage 15 for loading a memory card such as an SD card is disposed on the left side as viewed from the object (subject) side of the camera body. A memory card slot 121 is provided inside the memory card storage unit 15, and the memory card MC is loaded by inserting the memory card MC into the memory card slot 121.
Further, the eyepiece of the optical viewfinder 4, the AF display LED 8, the strobe display LED 9, the LCD monitor 10, the WIDE zoom button 11, the TELE zoom button 12, the power switch 13, and the operation button group 14 are as shown in FIG. It is arranged on the back side of the camera body.

The operation button group 14 includes a play button, a frequently used self-timer / delete button, a menu (MENU) / OK button, an up / strobe button, a down / macro button, a left / image confirmation button, a right button, and an image. Includes display buttons to display. The up / strobe button, down / macro button, left / image confirmation button, and right button constitute up / down / left / right buttons corresponding to the cross key.
In this digital camera, for example, a screen for performing various settings can be displayed by operating the MENU button, and the up, down, left, and right buttons can be operated in this state to shift to the manual focusing mode. After selecting the manual focusing mode, the through image can be displayed again by operating the MENU button. In a state in which a through image is displayed in the manual focusing mode, for example, the focusing operation can be performed by driving the position of the focus lens system of the lens unit 18 to an arbitrary position along the optical axis direction with the up and down buttons.
Next, an outline of the control system of the digital camera shown in FIG. 1 will be described. Here, the portions necessary for understanding the present invention are mainly described in detail, and portions not so important for understanding the present invention are not necessarily described in detail.

The zoom lens system of the zoom optical system and the focus lens system of the focus optical system in the lens unit 18 constitute an imaging optical system, and form an optical image of the subject on the light receiving surface of the imaging element 101. The motor driver 19-2 is controlled by the CPU block 104-3 of the camera processor 104. The zoom drive motor, the focus drive motor, the aperture motor in the lens unit 18 and the shutter motor 19- disposed near the mount 7 in the camera body. 1 is driven.
The image pickup device 101 is configured using a solid-state image pickup device such as a CMOS (complementary metal oxide semiconductor) image sensor or a CCD (charge coupled device) image sensor. Capture as an image signal. The front end unit (F / E unit) 102 is controlled by the CPU block 104-3 of the camera processor 104. The imaging device 101, the CDS 102-1, the AGC 102-2, and the A are supplied by the TG 102-4 supplied with the vertical drive signal (VD) and the horizontal drive signal (HD) from the first imaging signal processing block 104-1 of the camera processor 104. A drive timing signal for the / D conversion unit 102-3 is generated and driven at a predetermined timing. The CDS 102-1 performs correlated double sampling on the image signal output from the image sensor 101 to remove image noise. The AGC 102-2 adjusts the gain of the image signal that has been correlated and sampled by the CDS 102-1. The A / D conversion unit 102-3 converts the image signal whose gain has been adjusted by the AGC 102-2 into a digital signal.

In the camera processor 104, the first image signal processing block 104-1 performs white balance adjustment and gamma adjustment on the image data captured by the image sensor 101 and output from the front end unit 102, and as described above. The VD signal and the HD signal are supplied to the TG 102-4 of the front end unit 102. The second imaging signal processing block 104-2 performs processing for converting image data into luminance data and color difference data by filtering processing. The CPU block 104-3 controls the operation of each part of the apparatus as described above. The local SRAM 104-4 temporarily stores data necessary for the above-described control.
Further, in the camera processor 104, a USB processing block 104-5 is connected to an external device such as a PC (Personal Computer) in accordance with the USB standard, performs USB signal processing for communication with the external device, and a serial block. 104-6 is connected to an external device such as a PC in accordance with a serial communication standard such as RS-232C, and performs serial signal processing for communication with the external device. The JPEG codec block 104-7 includes image data JPEG compression / decompression is performed, the resize block 104-8 enlarges / reduces the size of the image data by an interpolation process such as extrapolation / interpolation, and the video signal display block 104-9 displays the image data on the LCD monitor 10 And video signals for display on external display devices such as TV receivers The memory card controller block 104-10 records the captured image data recorded on the memory card loaded in the memory card slot 121 in the memory card loading unit 15, and reproduces the captured image data recorded on the memory card. Memory card writing / reading control is performed.

The LCD driver 117 is a circuit for driving the LCD monitor 10, and the LCD driver 117 has a function of converting the video signal output from the video signal display block 104-9 into a signal for displaying on the LCD monitor 10. Also have. The LCD monitor 10 is a monitor mainly for displaying an image, and a through display for observing the state of a subject before photographing, a display for confirming a photographed image, and an image recorded in a memory card or a built-in memory 120. Display such as playback display for checking / appreciating data.
Next, the basic operation of the digital camera shown in FIGS. 1 and 2, the strobe light emitting unit 5 and the strobe circuit 114 are used to supplement the light amount when the amount of natural light or the like in the subject is insufficient. That is, for shooting in a dark place or shooting when the subject is dark, the strobe circuit 114 emits the strobe light emitting unit 3 to illuminate the subject by giving a strobe light emission signal from the camera processor 104 to the strobe circuit 114.

The distance measuring unit 16 measures the distance between the digital camera and the subject to obtain subject distance information. In recent autofocusing (AF) in a digital camera, generally, a contrast or the like as a focus evaluation value of a subject image formed on an image sensor 101 by an optical system of a lens unit 18 mounted on a mount 7 is detected. A so-called CCD-AF system is used in which the focus lens system of the lens unit 18 is moved to a position where the contrast is the highest to adjust the focus. However, such a CCD-AF method has a problem that the focusing operation is slow because the lens is moved little by little to search for contrast. Therefore, distance information with the subject is always acquired using the distance measuring unit 16, and the focus lens system is moved at a stroke based on this distance information to speed up the focusing operation.
The temperature sensor 124 is provided to measure the environmental temperature. The temperature sensor 124 measures the internal and external temperatures of the digital camera. If the temperature is abnormally high, the digital camera is turned off or the temperature sensor data is displayed. To change the control details of the camera.

The lens mount 7 is for coupling the interchangeable lens unit 18 to the camera body. The lens mount 7 is a screw-in type in which the lens unit 18 and the lens mount 7 are threaded, or the lens unit 18 and the lens mount 7. A bayonet type or the like is known in which a plurality of claws are arranged and fixed by rotating the lens unit 18. The electrical contact 17 drives the lens by the camera body side acquiring lens information from the lens mounted on it, or transmitting drive signals such as zoom, focus and diaphragm from the motor driver 7-5 to the lens unit 18. It is for making it happen.
The ROM 108 stores a control program written in a code that can be decoded by the CPU block 104-3 and parameters for control. When the power of the digital camera is turned on, the above-described program is loaded into a main memory (not shown), and the CPU block 104-3 controls the operation of each part of the apparatus according to the program and is necessary for the control. Such data is temporarily stored in the RAM 107 and a local SRAM 104-4 in the camera processor 104 described later. Further, by using a rewritable flash ROM as the ROM 108, it is possible to change the control program and parameters for control, and the function can be easily upgraded.

The SDRAM 103 temporarily stores image data when the camera processor 104 described above performs various processes on the image data. The stored image data is, for example, captured from the image sensor 101 via the F / E unit 102, and RAW- in a state where white balance setting and gamma setting are performed in the first imaging signal processing block 104-1. RGB image data, YCbCr image data that has been subjected to luminance data / color difference data conversion in the second imaging signal processing block 104-2, and JPEG image data that has been JPEG compressed in the JPEG codec block 104-7 is there.
The memory card slot 121 is a connector slot for detachably loading a memory card MC for storing captured image data, and writing / reading control of the memory card MC loaded in the memory card slot 121 is performed as follows. This is done by the memory card controller block 104-10 via the memory card slot 121. The built-in memory 120 is a memory for storing captured image data, and can store captured image data even when the memory card MC is not inserted in the memory card slot 121. It is provided for. The LCD driver 117 is a drive circuit that drives the LCD monitor 10 to be described later, and has a function of converting the video signal output from the video signal display block 104-9 into a signal for display on the LCD monitor 10. Yes.

The LCD monitor 10 displays image data for monitoring the state of the subject before photographing, displays image data of the photographed image, and displays image data recorded in the memory card MC or the built-in memory 120 described above. Is provided to do. The video amplifier (video amplifier) 118 is an amplifier for converting the video signal output from the video signal display block 104-9 into a signal having an impedance of 75Ω or the like, and the video connector 119 is a television (TV). A connector for connecting to an external display device such as a receiver.
The USB connector 122 is a connector for USB connection with an external device such as a PC (personal computer). A serial interface unit 123 including a serial driver circuit 123-1 and a serial connector 123-2 is for performing serial communication with an external device such as a PC in accordance with a standardized serial communication standard such as the RS-232C standard. Configure the interface. That is, the serial driver circuit 123-1 is a circuit that converts the voltage of the output signal of the serial processing block 104-6, and the serial connector 123-2 converts the serial output voltage-converted by the serial driver circuit 123-1 to a PC or the like. It is a connector for connecting to external equipment.

The sub CPU 109 is, for example, a CPU such as a microprocessor having a built-in ROM / RAM on the same chip. The CPU block 104-of the camera processor 104 is output using the output signals from the operation unit 110 and the remote control light receiving unit 6 as user operation information. 3, or a control signal is supplied to the sub LCD 1, the AF display LED 8, the strobe display LED 9, and the buzzer 113 based on the camera state information output from the CPU block 104-3.
The sub LCD 1 is a display unit for displaying, for example, the number of shootable images, and the sub LCD driver 111 is a circuit that drives the sub LCD 1 based on an output signal of the sub CPU 109. The AF display LED 8 is an LED for displaying an in-focus state at the time of shooting, and the strobe display LED 9 is a light emission preparation state such as whether or not the strobe light emitting capacitor is fully charged and can emit light. It is LED for displaying. The AF display LED 8 and the strobe display LED 9 may be used for other display applications, for example, a display indicating that the memory card is being accessed.
The remote control light receiving unit 6 receives an optical signal such as infrared rays from a remote control transmitter (not shown) operated by the user.

In the audio recording unit 115, the user inputs an audio signal through the microphone 115-3, the audio signal input to the microphone 115-3 is amplified by the microphone amplifier 115-2, and the audio amplified by the microphone amplifier 115-2 is amplified. The signal is recorded by the voice recording circuit 115-1. The audio reproduction unit 116 converts the recorded audio signal into a signal for output reproduction from the speaker by the audio reproduction circuit 116-1, and the audio signal converted by the audio reproduction circuit 116-1 is converted into an audio amplifier. The speaker 116-3 is driven by the signal amplified by 116-2 and amplified by the audio amplifier 116-2 to output a sound signal.
Next, the configuration and operation that characterize the present invention in the digital camera according to one embodiment of the present invention configured as described above will be specifically described. Embodiment described here is not limited to it, It can implement with various corrections or deformation | transformation in the range which can be easily conceived by those skilled in the art.

〔Image processing〕
The flowchart shown in FIG. 5 shows the overall flow of basic image processing in the digital camera described above.
The flowchart in FIG. 5 shows an example of general image processing in this type of digital camera. This image processing is based on the control of the CPU block 104-3 in FIG. -1 and the second imaging signal processing block 104-2.
The image signal output from the image sensor 101 is sampled for each pixel by correlated double sampling in the CDS 102-1 and automatic gain control in the AGC 102-2, and the A / D converter 102-3 performs A / D The converted data is generally referred to as RAW data because it has not yet undergone image processing, and the first imaging signal processing block 104-1 and the second imaging signal processing block 104-2 of the camera processor 104, etc. The image data input to the image processing unit is such RAW data.

[Step S11 to White Balance (WB) Processing]
In the flowchart of FIG. 5, the RAW data is first subjected to white balance (WB) processing (step S11).
For example, when a CCD image sensor is used as the image sensor 101, red (red: R) and green (green: G) are individually provided for each pixel on the photodiode of the CCD image sensor that accumulates the amount of light from the subject. And blue (blue: B) color filters are attached, but the amount of transmitted light differs depending on the color of these color filters, so the amount of charge accumulated in the photodiode of each pixel is respectively Different for each color of the color filter. Of the three colors red (red), green (green) and blue (blue),
The most sensitive is green, and red and blue are less sensitive than green and about half. In the white balance (WB) processing in step S11, processing for increasing the gains for R (red) and B (blue) is performed in order to compensate for these sensitivity differences and make white in the captured image appear white. Also, since the color of the object changes depending on the color of the light source, it has a function of controlling the gains of R (red) and B (blue) to change so that the white color appears white even if the light source changes.

[Step S12-Gamma (γ) Correction Process]
FIG. 6 shows an example of the γ correction curve. In FIG. 6, the horizontal axis represents an input signal and the vertical axis represents an output signal, and nonlinear input / output conversion is performed as shown. In general, in a display output device such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), as shown in FIG. 7, the output is output with nonlinear characteristics with respect to the input. For example, in the case of a non-linear output as shown in FIG. 7, since the gradation is poor in brightness and the image tends to be dark, a person cannot read the image properly. Accordingly, in step S12, in consideration of the characteristics of the display output device, an input / output characteristic (gamma curve) that cancels the non-linear output characteristic is previously applied to the input signal so that the output is linear. This is the gamma correction process.

[Step S13-Interpolation Process]
When the image sensor 101 is, for example, a CCD image sensor, a color filter of any one of R (red), G (green), and B (blue) is attached to each pixel in an array called a Bayer array. In RAW data, there is only one color information per pixel. However, in order to realize an image suitable for observation from RAW data, information of three colors R (red), G (green), and B (blue) is necessary for each pixel, and there is not enough for each pixel. In order to supplement the information of the two colors, an interpolation process for generating color information by interpolating from surrounding pixels is performed.

[Steps S14 to YCbCr conversion processing]
The image data is in the RGB data format of three colors of R (red), G (green) and B (blue) at the RAW data stage. However, in YCbCr conversion, the RGB data is converted into the luminance signal Y and the color difference signal Cb. And YCbCr data format with Cr. In a JPEG image of a file format generally used in a digital camera or the like, an image is created from YCbCr data, and therefore RGB data is converted to YCbCr data. The conversion formula in this case is as follows, for example.
Y = 0.299 × R + 0.587 × G + 0.114 × B
Cb = −0.299 × R−0.587 × G + 0.886 × B
Cr = 0.701 × R−0.587 × G−0.114 × B
[Step S15-Color Correction Processing]
Color correction includes saturation setting, hue setting, partial hue change setting, and color suppression setting. The saturation setting is a parameter setting that determines the color intensity. For example, FIG. 8 shows the CbCr color space. For example, in the second quadrant, red is set from the origin to the red color. The longer the vector length to the (red) dot is, the darker the red color is. Next, the hue setting is a parameter for determining the hue. For example, in the third quadrant of FIG. 8, even if the vector length is the same as the green color, the hue changes if the vector direction is different. The partial hue change setting is a setting for rotating a partial color region as shown in the fourth quadrant of FIG. When the saturation is strong, the color becomes dark while the color noise tends to become strong. Therefore, in the color suppression setting, for example, a threshold value is provided for the luminance signal, and control for suppressing color noise is performed by suppressing the saturation in a region lower or higher than the threshold value.

[Step S16-Edge Enhancement Processing]
The edge emphasis processing can be described as an outline of processing as a block diagram shown in FIG. As shown in FIG. 9, the configuration of the edge enhancement processing is an edge extraction filter unit B1 that extracts an edge portion of an image from the luminance signal Y, and amplifies the edge extracted by the edge extraction filter unit B1 by applying a gain. A gain multiplication unit B2, a low pass filter (LPF) unit B3 for removing image noise components in parallel with the edge extraction unit B1, and an addition unit for adding the edge extraction data after gain multiplication and the image data after LPF processing B4. The strength of the edge is determined by the gain of the gain multiplication unit B2, and the edge becomes strong when the gain is large, and the edge becomes weak when the gain is small. In addition, the edge detection direction and the amount of edge extraction change depending on the filter coefficient of the edge extraction filter B1, and thus are important parameters. With the filter coefficient of the LPF part B3, the image is smoothed to reduce the noise of the image. However, when the LPF is applied strongly, the noise is reduced, but on the other hand, the fine part is crushed by the smoothing and the resolution tends to be lost. It is in.

[Other image processing]
In addition to the above-described processes, the image process includes a resizing process for changing the image size to an image size for saving, a JPEG compression process for compressing the information amount, and the like. May be inserted at an appropriate location in the flow.
Next, in the digital camera configured as described above, the background color change in the edge extraction mode, which is a feature of the present invention, will be specifically described. This process is also executed in the first imaging signal processing block 104-1 and the second imaging signal processing block 104-2 based on the control of the CPU block 104-3 in FIG .
[Background color change processing in edge extraction mode]
With reference to the flowchart shown in FIG. 10, the flow of processing for changing the background color in the edge extraction mode of the digital camera according to this embodiment will be described. Note that the background color change processing routine in the edge extraction mode is executed periodically every predetermined time from the standby state or whenever an operation related to the mode change is performed, or the user performs an edge change. It is executed each time an operation for selecting the extraction mode is performed.
First, it is determined whether or not the edge extraction mode has been selected by the user (step S21). If the edge extraction mode has not been selected, the process is terminated and the process returns to the standby state.
If it is determined in step S21 that the edge extraction mode is selected, it is determined whether or not a background color setting change is requested (step S22), and it is determined that a background color setting change is requested. If so, the background color setting screen is displayed (step S23), and the background color is set (step S24).
After the background color is set in step S24, or if it is determined in step S22 that the background color setting change is not requested, the background color change condition evaluation value is acquired (step S25). It is determined whether or not the condition evaluation value acquired in step S25 satisfies the background color change condition (step S26). If it is determined that the condition evaluation value satisfies the background color change condition, the background color is determined. Is changed (step S27).

After the background color is changed in step S27, or when it is determined in the preceding step S26 that the condition evaluation value does not satisfy the background color change condition, edge extraction processing is performed (step S28), and edge extraction is performed. An image is displayed (step S29).
When the edge extraction image is displayed in step S29, it is determined whether or not the end of the edge extraction mode is requested (step S30). If it is determined that the end of the edge extraction mode is requested, End the process and return to the standby state. If it is determined in step S30 that termination of the edge extraction mode is not requested, the process returns to step S22, and it is determined whether or not a background color setting change is requested.

[Edge extraction mode]
Here, each process related to the background color change process in the edge extraction mode described above will be described in more detail.
The edge extraction mode is a mode in which image processing of a so-called through image, which is used for confirming the composition of the subject before photographing, is changed and an image obtained by extracting the edge of the through image is displayed. When the user selects the edge extraction mode by operating the operation unit 110, the digital camera shifts to the edge extraction mode. In edge extraction from a through image, part of the processing is different from the edge enhancement processing described with reference to FIG. 9. Edge extraction filter processing and gain multiplication processing are performed on the luminance signal, and the filtering result by the LPF unit B3 is output. Do not be.
For example, when displaying a normal through image, processing is performed with the filter coefficient of the LPF unit B3 as shown in FIG. 11A, and when in the edge extraction mode, the filter coefficient of the LPF is all zero as shown in FIG. 11B. Process with. By doing so, the output result from the LPF part B3 becomes 0, and only the edge of the through image can be extracted. For example, a through image as shown in FIG. 12A is an image in which only an edge is extracted as shown in FIG. 12B in the edge extraction mode.

[Principle of Background Color Change] (Step S27)
When only normal edges are extracted, as shown in FIG. 12B, the edge portion is white (the luminance signal Y corresponds to the extracted edge amount) and the background other than the edges is black (the luminance signal Y is 0). In the present invention, the color of the background portion other than the edge (hereinafter referred to as “background color”) can be changed. That is, the background color can be changed by fixing the luminance signal Y and the color difference signals Cb and Cr of the background portion other than the edges to specified values.
(Luminance signal Y control)
In the processing for generating the edge extraction image as shown in FIG. 12B described above, the luminance signal Y becomes 0 and the background color becomes black in the background portion other than the edge. Therefore, when the LPF filter coefficient described in FIG. 11B is used, a luminance signal offset set in advance as desired is added to the image after the edge enhancement processing.

(Color difference signal Cb / Cr control)
As described above, in the edge enhancement process, the luminance signal Y is processed, whereas in the color correction process, the color difference signals Cb and Cr are processed. That is, in the color correction process, it is necessary to perform control to fix the color difference signals Cb and Cr to the designated color difference. In this way, the control for fixing the color difference signals Cb and Cr to the designated color difference can be realized by the following configuration, for example.
FIG. 13 schematically shows a configuration in which a color fixing process is added to the background color correction process. A conventional color correction processing unit B11 and a color fixing processing unit B12 are coupled in parallel to the input color difference signals Cb / Cr. A switch B13 is provided in the output portion so that the output of the color correction processing result and the output of the color fixing processing result can be selectively switched and output regardless of the input color difference signals Cb and Cr. Then, processing is performed so as to output color difference signals Cb and Cr having fixed values designated in advance. The color correction processing unit B11 and the color fixing processing unit B12 are not limited to the configuration in which the color correction processing unit B11 and the color fixing processing unit B12 are coupled in parallel as shown in FIG. The color fixing processing unit may be positioned before the final output so that the color fixing processing of the color fixing processing unit can be turned on / off.

[Background color setting screen] (Step S23 and Step S24)
The data of the background color setting screen advance prepared in the digital camera, in such a background color setting screen, not to desirable to allow the user to set any color using the operation unit 110 . For example, when setting the background color using the background color setting screen as shown in FIG. 14, with the background color setting screen displayed, the hue and saturation are set on the left side of the screen. Operate the slide bar on the right side to set the brightness.
That is, in the screen of FIG. 14, the mixed density of each color of M (magenta), R (red), G (green), and B (blue) is shown on the left side of the screen, and Y (luminance) is displayed by the slide bar on the right side of the screen. Represents. The display of “R: 3, M: 2” at the top of the screen in FIG. 14 indicates that red is 3 and magenta is 2, and the display of “Y: 6” is 6 as the luminance. It shows that it is selected. Here, conversion of each value into an actual set value will be described. For example, when the signals Y, Cb, and Cr are 8-bit signals, the signal Y takes values from 0 to 255, and the signals Cb and Cr take values from -127 to 128, respectively. In the case of FIG. 14, since the luminance signal Y is set in 10 steps, Y = 255/10 × (set value of Y). The color difference signal Cb is converted from the set values of B (blue) and R (red) and becomes Cb = 128/5 × (B set value) or Cb = −127 / 5 × (R set value). . Similarly, the color difference signal Cr is also converted from the set values of M (magenta) and G (green), and Cr = 128/5 × (set value of M) or Cr = −127 / 5 × (set value of G) ) If the selected color is displayed on the entire background of the setting screen, the selection operation can be performed while checking the actual color.

Conventionally, the background color of the edge extraction image in the edge extraction mode may have been achromatic and poor in color and difficult to see depending on the situation. By making it possible to change the background color of an image, the user can set an arbitrary background color for which an edge can be easily confirmed according to the situation. In addition, because it can be set to the background color of your choice, customization is also enhanced.
[Hold multiple background color settings]
As described above, once the background color setting set, to be able to plural holding have to desirable within this digital camera. For example, the set values of the signals Y, Cb, and Cr are stored as data in the built-in memory 120 or in the ROM 108 when the ROM 108 is rewritable, and can be read and selected when setting the background color. . It should be noted that a history of setting values may be automatically retained as in the past five times.
As described above, by enabling the setting information of a plurality of background colors to be stored in the imaging apparatus, the user can select and use a background color as desired from the previously set background colors. This eliminates the need to recreate the background color. Therefore, it is possible to easily change the background color according to the shooting environment and the situation such as mood.

[Background color change according to conditions] (Step S25, Step S26 and Step S27)
It is more desirable to change the background color change setting described above depending on conditions.
When the background color is changed depending on the condition, the condition for changing to the background color setting is also set. For example, a condition selection screen for changing the background color as shown in FIG. 15 is prepared in advance, and the user selects it by operating the operation unit 110. For example, FIG. 15 shows a state in which the zoom position of the lens information is selected as a condition. When a condition for changing the background color is set, an evaluation value for determining the condition is acquired. Next, examples of changing the background color under various conditions are shown.
[Background color changed according to lens replacement]
When the main body of the digital camera, that is, the camera body side, includes, for example, means for determining the lens type of the mounted lens unit 18 in the CPU block 104-3 of the camera processor 104 via the electrical contact 17 of FIG. the, but it may also be so associated background color for each interchangeable lens. That is, a background color is set for each interchangeable lens in advance, and when the interchangeable lens is mounted, the background color corresponding to the lens is automatically set with the type of the mounted lens as an evaluation value. Like that.
As described above, by changing the background color according to the interchangeable lens loaded at the time of lens replacement, a suitable background color can be set depending on the lens characteristics, or the background color can be color-coded for each lens. By setting this, it is possible to recognize which interchangeable lens is mounted by looking at the background color in the edge extraction mode.

[Change background color according to edge extraction result]
Further, as an evaluation value of the edge extraction result, but it may also be possible to change the background color according to the edge extraction result. As an edge extraction result to be used, the peak value may be an average value. For example, as shown in FIG. 16, level classification is set with some threshold values (threshold values Th1 to Th3) for edge extraction results such as peak values or average values, and edge extraction is performed. The background color (for example, background color 1 to background color 4) set in advance for each level category is changed depending on which level category (for example, 0 to Th1, Th1 to Th2, Th2 to Th3) is included. Like that. By changing the background color, it becomes possible to more easily recognize the degree of focus.
As described above, when the focus is in focus, the level of the edge extraction result becomes high. Therefore, by changing the background color according to the value of the edge extraction result, the level of the focus degree of focus Can be confirmed just by looking at the background color.

[Background color change based on lens information]
As shown in FIG. 1, the lens unit 18 and the camera body side of the digital camera each have communication means such as an electrical contact 17 or the like, and the camera body side is mounted via the electrical contact 17 or the like. focus position, in the case of a configuration capable of recognizing at least one zoom position and aperture setting, but it may also be possible to change the background color on the basis of the lens information.
For example, the focus position of the lens unit 18 is acquired as an evaluation value, information on the distance at which the subject is in focus with respect to the focus position is held in advance on the camera body side, and the focus position is converted into the subject focus distance. but it may also be to change the background color depending on the focus distance.
As described above, by changing the background color according to the focus position of the attached interchangeable lens, it is possible to recognize the focus position, that is, the subject in-focus distance only by looking at the background color.
Further, when the lens unit 18 is a zoom lens with a variable focal length, information on the zoom magnification with respect to the zoom position is held in advance on the camera body side in the same manner as in the above-described focus position. from the zoom position to obtain a zoom magnification, but it may also be so changed the background color in accordance with the zoom magnification.

As described above, by changing the background color according to the zoom position of the mounted interchangeable lens, the zoom position, that is, the zoom magnification can be recognized only by looking at the background color.
As for the aperture setting value, the larger the aperture setting value (F value) (the smaller the aperture opening), the deeper the subject depth becomes, and it becomes difficult to grasp the focus position. in the case was, even so as to be in dark background color, such as edge stand out not good.
As described above, by changing the background color according to the aperture setting of the mounted interchangeable lens, it is possible to recognize the aperture setting state only by looking at the background color. In addition, when the aperture value is set large and the aperture is narrowed down, it becomes difficult to visually recognize the edge because the depth of the subject becomes deep, but the edge visibility is improved by changing the background color according to the aperture setting value. It becomes possible.

[Background color change based on time / date]
A digital camera is generally provided with time measuring means such as a so-called calendar clock timer that outputs time and date information, and the background color may be changed according to at least one of time and date.
When changing the background color according to the time, for example, the time zone is divided into four time zones, such as morning, noon, evening, and night, and the background color corresponding to each is set in advance. time you to use the background color that corresponds to the belonging time zone.
As described above, by changing the background color according to the time at the time of shooting, the time can be recognized simply by confirming the background color, or the background color of the optimum color for each time is set. It becomes possible to do.
When the background color is changed according to the date, for example, the background color is set in advance corresponding to each season of spring, summer, autumn and winter, and the day when the digital camera is used belongs. Display the background color corresponding to the season. Furthermore, a background color for only a special day such as a birthday may be set in advance and held in the digital camera, and the background color used only for that special day may be changed .
As described above, by changing the background color according to the date of shooting, it is possible to change the background color for each month, day of the week, special day, etc. The feeling at the time of shooting can be raised by feeling the day of the week or the day of the week.

[Change the background color depending on the output device]
Furthermore, the image in the edge extraction mode as described above can be output and displayed on an external display device connected via the video connector 119 in addition to being output and displayed on the LCD monitor 10 mounted on the digital camera. It is. In addition, some recent digital cameras can be equipped with an external electronic view finder (EVF). Thus, LCD monitor output which is mounted in a digital camera, respectively corresponding to the display apparatus such as a video jack output and EVF output but it may also be possible to change the background color. That is, the background color corresponding to each of the LCD monitor output, the video jack output, and the EVF output is stored in advance, and when the output display device is switched, the background color corresponding to the output device is read and displayed. By doing in this way, the difference of the color expression by the difference of the characteristic of a display apparatus can be eliminated, and it can set to the color which is easy to see for every display apparatus.
As described above, by changing the background color according to the display device that displays the edge extraction image in the edge extraction mode, it is possible to reduce or eliminate the difference in color expression due to the difference in the characteristics of the display device. Thus, it is possible to set a background color that is easy to see for each display device.

[Change background color according to subject brightness]
Also, but it may also be possible to change the background color according to the object luminance. Processing for changing the background color according to the subject luminance will be described. The average luminance value of the subject is calculated from the through image. A background color corresponding to each of the divided luminance areas divided by the threshold value with respect to the luminance value average is set in advance. If the brightness of the through image changes when the composition is changed by moving the imaging field of view of the digital camera, the background color is changed because the average brightness value changes. The background color setting corresponding to the average luminance value may be a different background color, but the average luminance value easily changes due to composition changes, so the screen color changes frequently. Is expected. Therefore, if the values of the color difference signals Cb and Cr are not changed with respect to the set values of the background color signals Y, Cb and Cr but only the luminance signal Y is changed, only the lightness changes with the same hue of the background color. According to the subject brightness, the brightness is high when it is bright, and the brightness is low when it is dark, so that the visibility of the edge in the edge extracted image can be improved.
As described above, by changing the background color according to the subject brightness, even if the subject is the same background color, the brightness is increased for bright subjects, and the brightness is decreased for dark subjects. It is possible to display the edge so that it is easy to visually recognize each time.

[Background color changed according to the gain of the image sensor]
Furthermore, but it may also be possible to change the background color according to the value of the gain of the imaging element (gain). In a through image in a digital camera, the gain of the image sensor 101, that is, the sensitivity, is changed according to the subject brightness, and when the subject brightness is dark, a high gain value is set to control the brightness so that the image is brightened. Is often raised. Therefore, a background color corresponding to each threshold gain area divided by the threshold value is set in advance in the gain value of the image sensor 101. As in the case of the background color according to the subject brightness, if the brightness of the through image changes when the composition is changed by moving the imaging field of view of the digital camera, the gain of the image sensor 101 is controlled accordingly. Since the gain value is changed, the background color is changed. The background color corresponding to the gain value of the image sensor 101 may be set to a different background color. However, since the gain value of the image sensor 101 easily changes due to a composition change, the screen is frequently displayed. The color of is expected to change. Therefore, if the values of the color difference signals Cb and Cr are not changed with respect to the background color signals Y, Cb, and Cr, and only the luminance signal Y is changed, the hue of the background color is the same and only the brightness changes, and the image sensor When the gain value of 101 is low (subject brightness is high), the brightness is high, and when the gain value of the image sensor 101 is high (subject brightness is low), the brightness is low, and the visibility of the edge in the edge extracted image is set. The increase in noise when the subject brightness is low and the gain value of the image sensor 101 is high can be reduced.
As described above, by changing the background color in accordance with the gain setting value set in the image sensor 101, if the gain value is high, the brightness of the background color is lowered, thereby causing noise generated in the through image. You can reduce the appearance of.

1 Sub liquid crystal display (sub LCD)
2 Release button 3 Mode switching dial 4 Optical viewfinder 5 Strobe light emitting unit 6 Remote control light receiving unit (remote control light receiving unit)
7 Lens mount 8 Autofocus display light-emitting diode (AF display LED)
9 Strobe display light emitting diode (strobe display LED)
10 Liquid crystal display monitor (LCD monitor)
DESCRIPTION OF SYMBOLS 11 Wide-angle side (WIDE) zoom button 12 Telephoto side (TELE) zoom button 13 Power switch 14 Operation button group 15 Memory card storage part 16 Distance measuring unit 17 Electrical contact 18 Lens unit 101 Image pick-up element 102 Front end part (F / E part) )
103 SDRAM (Synchronous dynamic random access memory)
104 Camera processor 107 RAM (Random access memory)
108 ROM (Read Only Memory)
109 Sub CPU (Sub central processing unit)
110 Operation Unit 111 Sub LCD Driver 113 Buzzer 114 Strobe Circuit 115 Audio Recording Unit 116 Audio Playback Unit 117 LCD Driver 118 Video Amplifier (Video Amplifier)
119 Video Connector 120 Built-in Memory 121 Memory Card Slot 122 USB (Universal Serial Bus) Connector 123 Serial Interface Unit 19-1a Shutter 19-1 Shutter Motor 19-2 Motor Driver 102-1 CDS (Correlated Double Sampling Unit)
102-2 AGC (Automatic Gain Control Unit)
102-3 A / D (Analog-Digital) Converter 102-4 TG (Timing Generator)
104-1 First imaging signal processing block 104-2 Second imaging signal processing block 104-3 CPU (central processing unit) block 104-4 Local SRAM (local static random access memory)
104-5 USB processing block 104-6 Serial processing block 104-7 JPEG codec (CODEC) block 104-8 Resize block 104-9 Video signal display block 104-10 Memory card controller block 115-1 Audio recording circuit 115 -2 Microphone amplifier 115-3 Microphone (microphone)
116-1 Audio reproduction circuit 116-2 Audio amplifier (audio amplifier)
116-3 Speaker 123-1 Serial Driver Circuit 123-2 Serial Connector

JP 2010-114556 A JP 2010-16783 A JP 9-326025 A

Claims (8)

An imaging lens for forming a subject optical image;
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
An image display device for displaying an image obtained through the image processing means,
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
Display processing means for supplying an edge extraction image whose background color has been changed by the background color changing means to the image display means;
Ri name with a,
The imaging lens is detachable, and is configured as an interchangeable lens that is selectively loaded with a plurality of imaging lenses.
The imaging device includes means for determining the type of the interchangeable lens, and
The background color changing means is means for presetting a background color corresponding to each photographing lens in the interchangeable lens as the preset condition and changing the background color corresponding to the replacement of the photographing lens. An imaging apparatus characterized by that. An imaging lens for forming a subject optical image;
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
Image display means for displaying an image obtained via the image processing means;
An imaging device comprising:
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
Display processing means for supplying an edge extraction image whose background color has been changed by the background color changing means to the image display means;
With
Further comprising a time measuring means for obtaining the time,
The background color changing means is a means for presetting a background color corresponding to the time of operation as the preset condition and changing the background color corresponding to the time of operation. An imaging device. An imaging lens for forming a subject optical image;
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
Image display means for displaying an image obtained via the image processing means;
An imaging device comprising:
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
Display processing means for supplying an edge extraction image whose background color has been changed by the background color changing means to the image display means;
With
Further comprising a timekeeping means for obtaining a date;
The background color changing means is a means for presetting a background color corresponding to an operation date as the preset condition, and changing a background color corresponding to the operation date. An imaging device. An imaging lens that includes a focusing adjustment mechanism for focus adjustment, and forms an optical image of the subject; and
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
An image display device for displaying an image obtained through the image processing means,
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
When the captured image acquired by the imaging unit is supplied as a through image to the image display unit and used for real-time through image display, an edge extracted image whose background color has been changed by the background color changing unit is displayed as the image. Display processing means including an edge extraction mode supplied to the means;
Ri name with a,
The imaging lens is detachable, and is configured as an interchangeable lens that is selectively loaded with a plurality of imaging lenses.
The imaging device includes means for determining the type of the interchangeable lens, and
The background color changing means is means for presetting a background color corresponding to each photographing lens in the interchangeable lens as the preset condition and changing the background color corresponding to the replacement of the photographing lens. An imaging apparatus characterized by that. An imaging lens that includes a focusing adjustment mechanism for focus adjustment, and forms an optical image of the subject; and
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
Image display means for displaying an image obtained via the image processing means;
An imaging device comprising:
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
When the captured image acquired by the imaging unit is supplied as a through image to the image display unit and used for real-time through image display, an edge extracted image whose background color has been changed by the background color changing unit is displayed as the image. Display processing means including an edge extraction mode supplied to the means;
With
Further comprising a time measuring means for obtaining the time,
The background color changing means is a means for presetting a background color corresponding to the time of operation as the preset condition and changing the background color corresponding to the time of operation. An imaging device. An imaging lens that includes a focusing adjustment mechanism for focus adjustment, and forms an optical image of the subject; and
An imaging means for obtaining a captured image by converting an optical image of a subject formed by the imaging lens into image data by an imaging element;
Image processing means for performing image processing on the captured image acquired by the imaging means;
Image display means for displaying an image obtained via the image processing means;
An imaging device comprising:
The image processing means includes
Edge extraction means for extracting an edge of the captured image to obtain an edge extracted image;
Background color changing means for changing the color of the background, which is a region other than the edge, with respect to the edge extracted image by the edge extracting means, according to a preset condition;
When the captured image acquired by the imaging unit is supplied as a through image to the image display unit and used for real-time through image display, an edge extracted image whose background color has been changed by the background color changing unit is displayed as the image. Display processing means including an edge extraction mode supplied to the means;
With
Further comprising a timekeeping means for obtaining a date;
The background color changing means is a means for presetting a background color corresponding to an operation date as the preset condition, and changing a background color corresponding to the operation date. An imaging device. Any of claims 1 to 6, further comprising a means for setting in advance according to the desired user background color after changes in background color change of the edge extraction image by the background color changing means 1 The imaging device according to item . According to any one of claims 1 to 7, characterized in that it comprises further means for holding a plurality of setting the background color of the changed in the background color change of the edge extraction image by the background color changing means Imaging device.