WO2010070791A1 - 画像処理装置および画像入力装置 - Google Patents
画像処理装置および画像入力装置 Download PDFInfo
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- WO2010070791A1 WO2010070791A1 PCT/JP2009/005221 JP2009005221W WO2010070791A1 WO 2010070791 A1 WO2010070791 A1 WO 2010070791A1 JP 2009005221 W JP2009005221 W JP 2009005221W WO 2010070791 A1 WO2010070791 A1 WO 2010070791A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/045—Control thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
- H04N25/617—Noise processing, e.g. detecting, correcting, reducing or removing noise for reducing electromagnetic interference, e.g. clocking noise
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00009—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope
- A61B1/000095—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope for image enhancement
Definitions
- the present invention relates to an image processing apparatus mounted on a device that is expected to be used in the vicinity of a generation source of a high-voltage high-frequency signal, and a technique for avoiding an adverse effect of image noise caused by the high-voltage high-frequency signal.
- the present invention relates to an image processing apparatus and an image input apparatus mounted on an endoscope with an electric knife that generates a high-voltage high-frequency signal and a camera with a built-in mobile phone that is easily affected by communication radio waves.
- Digital camera modules are being applied to a wide range of fields, such as medical care and monitoring, with the downsizing of imaging units.
- the digital camera module is an image sensor, an analog front end (hereinafter abbreviated as AFE) that converts an analog image signal obtained by the image sensor into a digital image signal, and a digital signal that performs image signal processing of the digital image signal.
- AFE analog front end
- DSP digital signal processing of the digital image signal.
- DSP digital signal processing circuitry
- an electric scalpel driven at a high voltage / high frequency is disposed in the vicinity of a camera module inserted into the body, and a high voltage / high frequency signal generated by the operation of the electric scalpel is generated.
- This causes communication errors between DSP and AFE, between DSP and image sensor, and between DSP and processor.
- a processor here functions as a control part which performs integrated control of mounted equipment (medical camera etc.).
- high-frequency radio waves generated by the mobile phone cause a communication error between the camera module and the mobile phone body or in the camera module.
- FIG. 7 is a block diagram showing the configuration of an endoscope with an electric knife in the prior art (see, for example, Patent Document 1).
- This endoscope with an electric scalpel includes an imaging unit 10 on which an imaging element 11 is mounted and inserted into the body, an operation unit 20 that receives an operation when a doctor operates the insertion of the imaging unit 10 and a processor operation,
- the endoscope camera system main body includes a processor 30 that controls the entire operation of the endoscope, and an electric knife driving unit 40.
- An imaging signal obtained by the imaging device 11 is transmitted to the AFE 22 via the insertion cable 12 and digitized.
- the digital image signal is subjected to image processing by the DSP 23 and transmitted to the processor 30 via the extension cable 31.
- the DSP 23 controls the operation of the DSP 23 according to a control signal (control signal for controlling exposure time, frame rate, etc.) obtained by communication from the processor 30 or the operation unit 20, and also performs communication with the AFE 22 or the image sensor 11 by communication. By transmitting a control signal to the endoscope, optimum control in the endoscope is always performed.
- a control signal control signal for controlling exposure time, frame rate, etc.
- the operation of the endoscope portion (consisting of the imaging unit 10, the operation unit 20, and the processor 30) and the operation of the electric knife driving unit 40 are asynchronous, and the operation state of the electric knife 42 is detected by the endoscope portion. I can't. Therefore, when image noise caused by a high-frequency signal passing through the electric female cable 41 is superimposed on a communication signal between module elements, the AFE 22 and the image sensor 11 malfunction, and in some cases, the operation is stopped. The image output cannot be obtained from the endoscope.
- an electric knife operation detection circuit 80 is provided in the operation unit 20.
- the electric knife operation detection circuit 80 directly monitors an electric signal circuit (for example, a communication circuit) in the vicinity of the DSP 23, determines the operation / non-operation of the electric knife 42 through counting of pulse signals mixed in the electric signal, and When it is determined that the knife 42 is operating, communication of the digital camera module is stopped.
- an electric signal circuit for example, a communication circuit
- Patent Document 1 stops communication of the camera module when the electric knife operation detection circuit 80 detects that the electric knife 42 is operating. However, even if the electric knife 42 is operating, it may not affect the camera module image acquisition, and it can be said that the control over the communication of the camera module is excessive in the prior art. This is because the communication of the camera module is unnecessarily stopped although it does not adversely affect normal image acquisition. In addition, the electric knife operation detection circuit 80 newly installed in the operation unit 20 leads to an increase in the size of the operation unit 20.
- the present invention was created in view of such circumstances, and has an object of enabling optimum control as much as possible.
- An image processing apparatus includes: AFE for generating a digital image signal from the image signal; A DSP for performing image processing of the digital image signal; With The DSP A first communication circuit for communicating with the AFE; An image noise detection circuit for detecting whether image noise is superimposed on the digital image signal; A communication control circuit that outputs a communication prohibition signal when the image noise detection circuit detects that image noise is superimposed on the digital image signal; With When the first communication circuit detects the communication prohibition signal, the first communication circuit stops its communication operation.
- the communication control circuit outputs a communication prohibition signal and is detected by the first communication circuit when the image noise detection circuit detects image noise.
- the configuration of the present invention in which the communication control circuit outputs a communication prohibition signal based on the detection of the image noise, and the operation of the electric knife ⁇ the occurrence of image noise and the electric knife based on the high frequency signal of the electric knife drive The configuration is completely different from the configuration in which the communication with the AFE is stopped when the operation of the electric knife is detected.
- the DSP A second communication circuit that communicates with a processor that controls the DSP;
- the second communication circuit detects the communication prohibition signal, the second communication circuit stops its communication operation. There is a mode. According to this aspect, it is possible to further ensure the control of the AFE.
- the communication control circuit preferably transmits the output of the communication prohibition signal to the processor via the second communication circuit. Then, the second communication circuit can inform the processor that image noise caused by the high frequency signal driven by the electric knife has occurred before the communication is stopped.
- the image noise detection circuit sets one or a plurality of target pixels and peripheral pixels located around each of the target pixels in the digital image signal, and then sets a pixel value of the target pixel and the peripheral pixels.
- a preset difference threshold it is determined that image noise is superimposed on the target pixel. There is a mode.
- the image noise detection circuit sets a plurality of the peripheral pixels for one target pixel, and calculates an average pixel value of the plurality of peripheral pixels as a pixel value of the peripheral pixels.
- the image noise detection circuit includes: A peripheral pixel averaging circuit for calculating a pixel value average value of the peripheral pixels; A difference circuit for calculating a difference between a pixel value of the target pixel and the pixel value average value; With The image noise detection circuit determines that image noise is superimposed on the target pixel when a difference between a pixel value of the target pixel and the average pixel value is equal to or greater than the difference threshold value. Is preferred.
- the digital image signal is periodically updated.
- the image noise detection circuit calculates the difference every time the digital image signal is updated, and then counts the number of times the calculated difference is equal to or greater than the difference threshold over a preset period, When the count value is equal to or greater than a preset count threshold value, it is determined that image noise is superimposed on the target pixel. There is a mode. According to this aspect, the reliability of the communication prohibition signal can be further increased.
- the DSP further includes a noise removal circuit
- the image noise detection circuit detects whether or not image noise is superimposed on each of a plurality of pixels of interest set in the digital image signal;
- the noise removal circuit replaces the pixel value of the pixel of interest, which is detected by the image noise detection circuit as having image noise superimposed thereon, with a pixel value of a peripheral pixel located around the pixel of interest, Remove the image noise, There is a mode.
- the image noise on the digital image signal caused by the high frequency signal driven by the electric knife can be removed by the noise removing circuit. If the image noise is successfully removed, the communication does not have to be stopped, and the workability can be improved.
- the communication control circuit stops generating the communication prohibition signal and the first communication circuit There is a mode in which communication with the AFE and communication with the processor by the second communication circuit are resumed.
- the operation of the first communication circuit and the second communication circuit can be resumed at the same time as the operation of the electric knife is stopped.
- the control of the digital camera module imaging device / AFE / DSP
- the image includes an AFE that digitizes an image signal obtained by the image sensor and a DSP that performs communication between the AFE and performs image processing on the digital image signal by the AFE.
- the present invention has been implemented in the processing apparatus, the object of implementing the present invention is not limited to such a configuration.
- an image input apparatus including a DSP excluding the configuration of the AFE is also included in the present invention. It becomes the object of.
- the effectiveness against image noise caused by electric knife drive is given as an example.
- the present invention is also effective against image noise caused by high-frequency radio waves generated by a mobile phone in a camera with a built-in mobile phone. is there.
- the communication is not stopped when the high-frequency signal has a level that does not affect the image signal. Therefore, optimal control is performed as much as possible. Can do. Further, it is not necessary to mount a circuit other than the camera module, and the image processing apparatus including the camera module can be downsized.
- FIG. 1 is a block diagram showing a schematic configuration of an endoscope with an electric knife in the first embodiment of the present invention.
- FIG. 2 is a block diagram showing a detailed configuration of the DSP according to the first embodiment.
- FIG. 3 is a diagram of a pixel of interest and peripheral pixels in the image noise detection circuit according to the first embodiment.
- FIG. 4 is a diagram of the difference between the target pixel value and the peripheral pixel average value in the image noise detection circuit according to the first embodiment.
- FIG. 5 is a conceptual diagram of a display monitor image during operation of the electric knife in the embodiment of the present invention.
- FIG. 6 is a block diagram showing a detailed configuration of the DSP according to the second embodiment of the present invention.
- FIG. 7 is a block diagram showing a schematic configuration of an endoscope with an electric knife in the prior art.
- FIG. 1 is a block diagram showing a schematic configuration of an endoscope with an electric knife (hereinafter, simply referred to as an endoscope) in which the camera module according to Embodiment 1 of the present invention is configured as a medical endoscope.
- This endoscope includes an image pickup unit 10 including an image pickup element 11, an operation unit 20 for operating each part of the endoscope, and a processor 30 that performs various types of image processing on image signals obtained by the image pickup element 11. And an electric knife drive unit 40.
- the image sensor 11 captures an optical image of a subject and converts it into an electrical signal indicating image information.
- the image sensor 11 is composed of a CCD (Charge-Coupled Device) or MOS (Metal-Oxide Semiconductor) image sensor.
- the operation unit 20 includes an operation member 21 for operating each part of the endoscope, an analog front end (hereinafter abbreviated as AFE) 22 that converts an analog image signal obtained by the image sensor 11 into a digital image signal, and the like. And a digital signal processor (hereinafter abbreviated as DSP) 23 for controlling the AFE 22 and the image sensor 11.
- the DSP 23 incorporates an image noise detection circuit 50.
- the operation unit 20 and the processor 30 are connected by an extension cable 31.
- the DSP 23 constitutes an image input device, and the AFE 22 and the DSP 23 constitute an image processing device.
- the processor 30 Control the DSP 23 to output an image signal to a display monitor (not shown). -Record image data on a recording medium (not shown), Is configured to perform control.
- the imaging unit 10 and the operation unit 20 are connected by an insertion cable 12.
- a signal line connecting the image sensor 11 and the AFE 22 is connected to the insertion cable 12.
- the electric female cable 41 extended from the electric knife driving unit 40 is connected to the imaging unit 10 through the insertion cable 12 and further has an electric part for cutting the affected part provided in a shape protruding beyond the imaging unit 10. Connected to the knife 42.
- the electric female cable 41 transmits a high frequency signal from the electric knife driving unit 40 to the electric knife 42.
- the electric knife drive unit 40 generates a high-voltage high-frequency signal of several hundred kilovolts by operating a switch (not shown) such as a foot pedal, and guides it to the electric knife 42 via the electric knife cable 41. .
- the DSP 23 always communicates with the AFE 22, processes the digital image signal output from the image sensor 11 via the AFE 22, and controls the AFE 22 so as to keep the image signal from the image sensor 11 in an optimal state. .
- the DSP 23 controls the gain circuit built in the AFE 22 so that the signal level of the image signal increases.
- the DSP 23 controls the AFE 22 and the image sensor 11 so that the charge accumulation time of the image sensor 11 is shortened. Control signals for the AFE 22 and the image sensor 11 may be generated by the processor 30 and transmitted to the DSP 23 via the extension cable 31.
- the operation of the electric knife driving unit 40 is asynchronous with the operation of the endoscope part including the imaging unit 10, the operation unit 20, and the processor 30, and the operation state of the electric knife 42 cannot be known from the endoscope part.
- image noise is generated in the communication signal of the endoscope portion due to the high-voltage high-frequency signal passing through the electric female cable 41, the AFE 22 and the image sensor 11 malfunction, and in some cases, the operation is stopped.
- the image noise detection circuit 50 is built in the DSP 23 as a countermeasure against such inconvenience.
- the image noise detection circuit 50 monitors whether or not image noise is mixed in the image signal being processed due to the high-voltage high-frequency signal generated by the operation of the electric knife driving unit 40, and the detection result of the image noise is obtained. Accordingly, the communication circuit of the DSP 23 is controlled.
- FIG. 2 is a block diagram showing a detailed configuration of the DSP 23 in the first embodiment.
- the DSP 23 includes a CPU (Central Processing Unit) 24, an image processing circuit 25, a first communication circuit 26, a second communication circuit 27, a peripheral pixel averaging circuit 51, a difference circuit 52, and a communication control circuit 53.
- CPU Central Processing Unit
- the image processing circuit 25 generates display data and recording code data from the digital image signal.
- the first communication circuit 26 communicates with the AFE 22.
- the second communication circuit 27 communicates with the processor 30.
- the peripheral pixel averaging circuit 51 and the difference circuit 52 constitute the image noise detection circuit 50.
- the peripheral pixel averaging circuit 51 sets one or a plurality of target pixels in one frame of the digital image signal (usually a plurality of target pixels), and then sets a plurality of pixels (hereinafter referred to as “peripheral pixels”) positioned around the set target pixels.
- the pixel value average value of the peripheral pixels is calculated.
- the difference circuit 52 generates a signal representing the difference between the pixel value of the target pixel and the average pixel value of the surrounding pixels.
- the communication control circuit 53 controls the generation of the communication prohibition signal according to the level of the difference signal. As described above, it is preferable to set a plurality of peripheral pixels for one target pixel and calculate an average value of the pixel values. However, at least one peripheral pixel may be set for one target pixel. . When a single peripheral pixel is set for one pixel of interest, the average value calculation process is not necessary.
- the digital image signal supplied from the AFE 22 to the DSP 23 is supplied to the processor 30 via the image processing circuit 25.
- This digital image signal is also supplied to the image noise detection circuit 50 at the same time.
- the image noise detection circuit 50 detects image noise caused by driving the electric knife 42 based on the digital image signal. That is, the digital image signal supplied to the image noise detection circuit 50 is first input to the peripheral pixel averaging circuit 51 provided in the preceding stage of the image noise detection circuit 50. Based on the input digital image signal, the peripheral pixel averaging circuit 51, as shown in FIG. 3, average pixel values (hereinafter referred to as pixel values) in peripheral pixels 61 of the same color arranged in a checkered pattern around each pixel of interest 60. Simply referred to as the average value Av).
- the difference circuit 52 provided at the subsequent stage of the image noise detection circuit 50 calculates a difference (Pv ⁇ Av) between the average value Av of the peripheral pixels 61 and the pixel value Pv of the target pixel 60. As shown in FIG. 4, the difference circuit 52 determines that the calculated difference (Pv ⁇ Av) is less than a predetermined difference threshold Th1 [(Pv ⁇ Av) ⁇ Th1]. It is determined that no noise is generated. On the other hand, when it is determined that the difference (Pv ⁇ Av) is greater than or equal to the difference threshold Th1 [(Pv ⁇ Av) ⁇ Th1], the difference circuit 52 determines that the image noise has occurred. The difference circuit 52 notifies the communication control circuit 53 of the occurrence of the image noise determined in this way.
- the communication control circuit 53 does not generate the communication prohibition signal Pro when notified from the difference circuit 52 that the image noise due to the electric knife drive has not occurred. On the other hand, the communication control circuit 53 generates the communication prohibition signal Pro when notified from the difference circuit 52 that the image noise is generated.
- the communication control circuit 53 supplies the communication prohibition signal Pro to the first communication circuit 26 and the second communication circuit 27.
- the first communication circuit 26 stops the communication operation with the AFE 22.
- the second communication circuit 27 stops the communication operation with the processor 30.
- the first and second can be selectively performed in a period in which it is determined that the electric knife driving unit 40 operates and image noise due to the operation of the electric knife driving unit 40 is generated. Communication of the communication circuits 26 and 27 is stopped. As a result, the AFE 22 can be controlled with high accuracy and necessary and sufficient. Note that the second communication circuit 27 indicates that the image noise due to the operation of the electric knife driving unit 40 has occurred before the communication operation with the processor 30 is stopped based on the communication prohibition signal Pro. To communicate.
- the CPU 24 generates a control signal C1 for controlling the AFE 22 and the image sensor 11 based on a communication signal supplied from the processor 30 via the second communication circuit 27. Further, the CPU 24 controls the AFE 22 by supplying the generated control signal C ⁇ b> 1 to the AFE 22 via the first communication circuit 26, and further controls the image sensor 11 via the AFE 22. While performing the above control, the CPU 24 detects the operation states of the image sensor 11, the AFE 22, and the DSP 23, and transmits the detected operation states to the processor 30 via the second communication circuit 27.
- FIG. 5 is a conceptual diagram of image signal output during operation of the electric knife driving unit 40.
- a black subject is taken. It is assumed that the electric knife driving unit 40 operates at a high voltage and a high frequency, and image noise is generated due to the operation. Then, image noise due to electric knife driving is superimposed on the image signal, and white image noise 71 is superimposed on the black monitor image 70.
- the image noise detection circuit 50 detects the image noise 71 caused by the electric knife drive, and controls the AFE 22 with high accuracy based on the detection result.
- the digital image signal is periodically updated based on the frame period of the image signal.
- the image noise detection circuit 50 calculates the difference (Pv ⁇ Av) every time the digital image signal is updated, and presets the number of times each of the calculated differences (Pv ⁇ Av) is equal to or greater than the difference threshold Th1. It is counted over a predetermined period (for example, 1 second), and when the count value becomes equal to or greater than a preset count threshold Th2 (Cou ⁇ Th2), it is determined that image noise is superimposed on the target pixel. May be.
- the count threshold Th2 may be any value greater than “1”.
- the communication control circuit 53 generates a communication prohibition signal Pro based on such image noise detection. Such an image noise detection operation is performed by the difference circuit 52, but may be performed by the communication control circuit 53.
- the number of times each difference (Pv ⁇ Av) is equal to or greater than the difference threshold Th1 is counted over a preset period (for example, 1 second), but in one frame of the digital image signal, .
- the number of pixels of interest whose difference (Pv ⁇ Av) is equal to or greater than the difference threshold Th1 is counted, and when the count is equal to or greater than a preset count threshold Th3 (Cou ⁇ Th3), image noise is present in the frame. You may determine with having superimposed.
- the communication control circuit 53 When the difference (Pv ⁇ Av) is less than the difference threshold Th1 [(Pv ⁇ Av) ⁇ Th1], or when the count value Cou is less than the count value threshold Th2 (Cou ⁇ Th2), the communication control circuit 53 performs communication. The output of the prohibit signal Pro is stopped. As a result, the operation of the electric knife 42 is stopped, and at the same time, the communication operation between the first communication circuit 26 and the second communication circuit 27 is resumed, and control of the camera module (imaging device / AFE / DSP) is performed again. To be executed. Note that the DSP 23 may transmit the stop of the communication prohibition signal Pro to the processor 30 via the second communication circuit 27.
- FIG. 6 is a block diagram showing a detailed configuration of the DSP 23 according to the second embodiment of the present invention.
- the DSP 23 according to the present embodiment is characterized by including a noise removal circuit 54.
- the noise removal circuit 54 uses the pixel value of the pixel of interest determined by the image noise detection circuit 50 as “image noise is superimposed” as the average value Av (peripheral pixel average circuit 51) of the surrounding pixels around the pixel of interest. Calculated by Thereby, image noise is removed. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
- image noise on the digital image signal generated by the operation of the electric knife 42 can be removed by the noise removal circuit 54. If the removal of the image noise is performed satisfactorily, it is not necessary to stop communication, and workability can be improved.
- the present invention is implemented in an endoscope with an electric scalpel.
- the present invention can be implemented in a camera with a built-in mobile phone. This makes it possible to avoid malfunction of the camera module due to high-frequency radio with the outside.
- the present invention in communication between the AFE-DSP in the camera module or communication between the camera module and the control processor, it becomes possible to avoid an uncontrollable state due to communication image noise due to external factors. This is particularly effective in an endoscope with an electric knife. Further, even in a camera with a built-in mobile phone, it is possible to avoid malfunction of the camera module due to high-frequency radio with the outside.
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Abstract
Description
画像信号からデジタル画像信号を生成するAFEと、
前記デジタル画像信号の画像処理を行うDSPと、
を備え、
前記DSPは、
前記AFEとの間で通信を行う第1の通信回路と、
前記デジタル画像信号に画像ノイズが重畳されているか否かを検出する画像ノイズ検出回路と、
前記デジタル画像信号に画像ノイズが重畳されていることを前記画像ノイズ検出回路が検出すると、通信禁止信号を出力する通信制御回路と、
を備え、
前記第1の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する。
前記DSPは、
当該DSPを制御するプロセッサとの間で通信を行う第2の通信回路を、
さらに備え、
前記第2の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する、
という態様がある。この態様によれば、AFEの制御をさらに確実なものとすることが可能となる。
前記画像ノイズ検出回路は、前記デジタル画像信号に、一つもしくは複数の注目画素と、当該注目画素それぞれの周辺に位置する周辺画素とを設定したうえで、前記注目画素の画素値と前記周辺画素の画素値との間の差分が、予め設定された差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する、
という態様がある。
のが好ましく、
さらには、
前記画像ノイズ検出回路は、
前記周辺画素の画素値平均値を算出する周辺画素平均回路と、
前記注目画素の画素値と前記画素値平均値との間の差分を算出する差分回路と、
を備え、
前記画像ノイズ検出回路は、前記注目画素の画素値と前記画素値平均値との間の差分が、前記差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する、
のが好ましい。
前記デジタル画像信号は周期的に更新されるものであり、
前記画像ノイズ検出回路は、前記デジタル画像信号の更新毎に前記差分を算出したうえで、算出した前記差分それぞれが前記差分閾値以上となる回数を予め設定しておいた期間に渡ってカウントし、そのカウント値が予め設定されたカウント閾値以上になると、前記注目画素に画像ノイズが重畳されていると判定する、
という態様がある。この態様によれば、通信禁止信号の信頼性をさらに高いものにすることが可能となる。
前記DSPは、ノイズ除去回路をさらに備えており、
前記画像ノイズ検出回路は、前記デジタル画像信号に設定する複数の注目画素それぞれにおいて画像ノイズが重畳されているか否かを検出し、
前記ノイズ除去回路は、前記画像ノイズ検出回路によって画像ノイズが重畳されていることが検出された前記注目画素の画素値を、当該注目画素の周辺に位置する周辺画素の画素値に置き換えることで、その画像ノイズを除去する、
という態様がある。
前記画像ノイズ検出回路が前記画像ノイズの重畳を検出したのち当該画像ノイズの重畳を検出しなくなると、前記通信制御回路は、前記通信禁止信号の生成を停止して前記第1の通信回路による前記AFEとの間の通信や、前記第2の通信回路による前記プロセッサとの間の通信を再開させる、という態様がある。
図1は本発明の実施の形態1におけるカメラモジュールを医療用の内視鏡として構成した電気メス付き内視鏡(以下、単に内視鏡と称する)の概略構成を示すブロック図である。この内視鏡は、撮像素子11を内蔵した撮像部10と、内視鏡の各部を操作するための操作部20と、撮像素子11で得られた画像信号に各種の画像処理を施すプロセッサ30と、電気メス駆動部40とを備える。
・DSP23を制御して画像信号を表示モニタ(図示せず)に出力する、
・記録媒体(図示せず)に画像データを記録する、
ための制御を行うように構成されている。
図6は本発明の実施の形態2におけるDSP23の詳細な構成を示すブロック図である。図6において、実施の形態1の図2におけるのと同じ符号は同一構成要素を指している。本実施の形態のDSP23は、ノイズ除去回路54を備えることに特徴がある。ノイズ除去回路54は、画像ノイズ検出回路50が"画像ノイズが重畳している"と判断した注目画素の画素値を、その注目画素の周囲にある周辺画素の平均値Av(周辺画素平均回路51によって算出される)で置き換えている。これにより、画像ノイズを除去している。その他の構成については、実施の形態1と同様であるので、説明を省略する。
11 撮像素子
12 挿入ケーブル
20 操作部
21 操作部材
22 AFE(アナログフロントエンド)
23 DSP(デジタルシグナルプロセッサ)
24 CPU
25 画像処理回路
26 第1の通信回路
27 第2の通信回路
30 プロセッサ
31 延長ケーブル
40 電気メス駆動部
41 電気メスケーブル
42 電気メス
50 画像ノイズ検出回路
51 周辺画素平均回路
52 差分回路
53 通信制御回路
54 ノイズ除去回路
60 注目画素
61 周辺画素
70 モニタ画像
71 電気メス駆動に起因する画像ノイズ
Claims (24)
- 画像信号からデジタル画像信号を生成するAFEと、
前記デジタル画像信号の画像処理を行うDSPと、
を備え、
前記DSPは、
前記AFEとの間で通信を行う第1の通信回路と、
前記デジタル画像信号に画像ノイズが重畳されているか否かを検出する画像ノイズ検出回路と、
前記デジタル画像信号に画像ノイズが重畳されていることを前記画像ノイズ検出回路が検出すると、通信禁止信号を出力する通信制御回路と、
を備え、
前記第1の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する、
画像処理装置。 - 前記画像ノイズ検出回路は、前記デジタル画像信号に、一つもしくは複数の注目画素と、当該注目画素それぞれの周辺に位置する周辺画素とを設定したうえで、前記注目画素の画素値と前記周辺画素の画素値との間の差分が、予め設定された差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する、
請求項1の画像処理装置。 - 前記画像ノイズ検出回路は、一つの前記注目画素に対して複数の前記周辺画素を設定したうえで、これら複数の周辺画素の画素値平均値を、前記周辺画素の画素値とする、
請求項2の画像処理装置。 - 前記デジタル画像信号は周期的に更新されるものであり、
前記画像ノイズ検出回路は、前記デジタル画像信号の更新毎に前記差分を算出したうえで、算出した前記差分それぞれが前記差分閾値以上となる回数を予め設定しておいた期間に渡ってカウントし、そのカウント値が予め設定されたカウント閾値以上になると、前記注目画素に画像ノイズが重畳されていると判定する、
請求項2の画像処理装置。 - 前記デジタル画像信号は周期的に更新されるものであり、
前記画像ノイズ検出回路は、前記デジタル画像信号の更新毎に前記差分を算出したうえで、算出した前記差分が前記差分閾値以上となる個数を1フレームにおいてカウントし、そのカウント値が予め設定されたカウント閾値以上になると、前記注目画素に画像ノイズが重畳されていると判定する、
請求項2の画像処理装置。 - 前記DSPは、
当該DSPを制御するプロセッサとの間で通信を行う第2の通信回路を、
さらに備え、
前記第2の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する、
請求項1の画像処理装置。 - 前記通信制御回路は、前記通信禁止信号の出力を前記第2の通信回路を介して前記プロセッサに伝達する、
請求項6の画像処理装置。 - 前記画像ノイズ検出回路は、
前記周辺画素の画素値平均値を算出する周辺画素平均回路と、
前記注目画素の画素値と前記画素値平均値との間の差分を算出する差分回路と、
を備え、
前記画像ノイズ検出回路は、前記注目画素の画素値と前記画素値平均値との間の差分が、前記差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する
請求項3の画像処理装置。 - 前記DSPは、ノイズ除去回路をさらに備えており、
前記画像ノイズ検出回路は、前記デジタル画像信号に設定する複数の注目画素それぞれにおいて画像ノイズが重畳されているか否かを検出し、
前記ノイズ除去回路は、前記画像ノイズ検出回路によって画像ノイズが重畳されていることが検出された前記注目画素の画素値を、当該注目画素の周辺に位置する周辺画素の画素値に置き換えることで、その画像ノイズを除去する、
請求項1の画像処理装置。 - 前記ノイズ除去回路は、一つの前記注目画素に対して複数の前記周辺画素を設定したうえで、これら複数の周辺画素の画素値平均値を、前記周辺画素の画素値とする、
請求項9の画像処理装置。 - 前記画像ノイズ検出回路が前記画像ノイズの重畳を検出したのち当該画像ノイズの重畳を検出しなくなると、前記通信制御回路は、前記通信禁止信号の生成を停止して前記第1の通信回路による前記AFEとの間の通信を再開させる、
請求項1の画像処理装置。 - 前記画像ノイズ検出回路が前記画像ノイズの重畳を検出したのち当該画像ノイズの重畳を検出しなくなると、前記通信制御回路は、前記通信禁止信号の生成を停止して、前記第2の通信回路による前記プロセッサとの間の通信を再開させる、
請求項6の画像処理装置。 - AFEが画像信号から生成したデジタル画像信号の画像処理を行うDSPを備え、
前記DSPは、
前記AFEとの間で通信を行う第1の通信回路と、
前記デジタル画像信号に画像ノイズが重畳されているか否かを検出する画像ノイズ検出回路と、
前記デジタル画像信号に画像ノイズが重畳されていることを前記画像ノイズ検出回路が検出すると、通信禁止信号を出力する通信制御回路と、
を備え、
前記第1の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する、
画像入力装置。 - 前記画像ノイズ検出回路は、前記デジタル画像信号に、一つもしくは複数の注目画素と、当該注目画素それぞれの周辺に位置する周辺画素とを設定したうえで、前記注目画素の画素値と前記周辺画素の画素値との間の差分が、予め設定された差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する、
請求項13の画像入力装置。 - 前記画像ノイズ検出回路は、一つの前記注目画素に対して複数の前記周辺画素を設定したうえで、これら複数の周辺画素の画素値平均値を、前記周辺画素の画素値とする、
請求項14の画像入力装置。 - 前記デジタル画像信号は周期的に更新されるものであり、
前記画像ノイズ検出回路は、前記デジタル画像信号の更新毎に前記差分を算出したうえで、算出した前記差分それぞれが前記差分閾値以上となる回数を予め設定しておいた期間に渡ってカウントし、そのカウント値が予め設定されたカウント閾値以上になると、前記注目画素に画像ノイズが重畳されていると判定する、
請求項14の画像入力装置。 - 前記デジタル画像信号は周期的に更新されるものであり、
前記画像ノイズ検出回路は、前記デジタル画像信号の更新毎に前記差分を算出したうえで、算出した前記差分が前記差分閾値以上となる個数を1フレームにおいてカウントし、そのカウント値が予め設定されたカウント閾値以上になると、前記注目画素に画像ノイズが重畳されていると判定する、
請求項14の画像入力装置。 - 前記DSPは、
当該DSPを制御するプロセッサとの間で通信を行う第2の通信回路を、
さらに備え、
前記第2の通信回路は、前記通信禁止信号を検知するとその通信動作を停止する、
請求項13の画像入力装置。 - 前記通信制御回路は、前記通信禁止信号の出力を前記第2の通信回路を介して前記プロセッサに伝達する、
請求項18の画像入力装置。 - 前記画像ノイズ検出回路は、
前記周辺画素の画素値平均値を算出する周辺画素平均回路と、
前記注目画素の画素値と前記画素値平均値との間の差分を算出する差分回路と、
を備え、
前記画像ノイズ検出回路は、前記注目画素の画素値と前記画素値平均値との間の差分が、前記差分閾値以上になると、前記注目画素において画像ノイズが重畳されていると判定する、
請求項15の画像入力装置。 - 前記DSPは、ノイズ除去回路をさらに備えており、
前記画像ノイズ検出回路は、前記デジタル画像信号に設定する複数の注目画素それぞれにおいて画像ノイズが重畳されているか否かを検出し、
前記ノイズ除去回路は、前記画像ノイズ検出回路によって画像ノイズが重畳されていることが検出された前記注目画素の画素値を、当該注目画素の周辺に位置する周辺画素の画素値に置き換えることで、その画像ノイズを除去する、
請求項13の画像入力装置。 - 前記ノイズ除去回路は、一つの前記注目画素に対して複数の前記周辺画素を設定したうえで、これら複数の周辺画素の画素値平均値を、前記周辺画素の画素値とする、
請求項21の画像入力装置。 - 前記画像ノイズ検出回路が前記画像ノイズの重畳を検出したのち当該画像ノイズの重畳を検出しなくなると、前記通信制御回路は、前記通信禁止信号の生成を停止して前記第1の通信回路による前記AFEとの間の通信を再開させる、
請求項13の画像入力装置。 - 前記画像ノイズ検出回路が前記画像ノイズの重畳を検出したのち当該画像ノイズの重畳を検出しなくなると、前記通信制御回路は、前記通信禁止信号の生成を停止して、前記第2の通信回路による前記プロセッサとの間の通信を再開させる、
請求項18の画像入力装置。
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JP2015036055A (ja) * | 2013-08-13 | 2015-02-23 | Hoya株式会社 | 内視鏡システム |
WO2021176939A1 (ja) * | 2020-03-05 | 2021-09-10 | Hoya株式会社 | 電子内視鏡システム |
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JP3182125U (ja) * | 2012-12-26 | 2013-03-07 | オリンパスイメージング株式会社 | 撮影装置 |
JPWO2015029856A1 (ja) * | 2013-08-27 | 2017-03-02 | オリンパス株式会社 | 処理装置および内視鏡システム |
JP6594727B2 (ja) * | 2015-10-07 | 2019-10-23 | オリンパス株式会社 | 内視鏡 |
DE102017213052B4 (de) * | 2017-07-28 | 2019-10-31 | Dialog Semiconductor (Uk) Limited | Leistungsumsetzer |
US11918422B2 (en) * | 2017-12-19 | 2024-03-05 | Intuitive Surgical Operation, Inc. | Systems and methods for communicating over a reduced number of conductors in a teleoperational system |
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