JP2002142229A - Image signal-processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a memory for adjusting delay needs to be newly added even when a primary color signal that is subjected to regular reflection is inverted and at the same time all signals including the primary color signal that is not subjected to regular reflection are subjected to image processing as an input signal before outputting. SOLUTION: A reference pulse corresponding to a line where a primary color signal that is subjected to regular reflection at the start line of an effective signal from an image pickup element and a non-inverted primary color signal do not match is created, and a corrected signal after passing a second memory 2 for delay for correcting the defect of a normal pixel is passed through an inversion memory only for the reference pulse period for switching to a signal before pixel defect correction, thus creating the effective line of the primary color signal that is subjected to regular reflection corresponding to all effective lines of the primary color signal without requiring any inversion memories, and hence outputting and displaying all effective lines from the image pickup element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal processing apparatus for splitting incident light into a plurality of primary color signals including primary color signals in a mirror-inverted state, and processing each digitized signal.

[0002]

2. Description of the Related Art In recent years, the size and performance of imaging devices such as consumer video cameras have been rapidly increased, and some small 3CCD cameras using a gapless prism have been commercialized.

An image signal processing apparatus using a conventional small 3CCD camera will be described below.

In the case of a conventional 3CCD camera using a prism, a method using an air gap or the like is employed so that all the primary color signals separated from the prism coincide with each other in the spatial position of the screen. In order to realize
A system using a gapless prism in which only a certain primary color signal is in a mirror-inverted state is being adopted. In this case, the mirror-reversed primary color signal is digitized and then horizontally inverted using a memory so as to be adjusted to the same image space position as the non-mirror-reversed primary color signal. Then, a correlation between peripheral pixels including the vertical line direction is detected by using the output signal inverted left and right and an output signal further delayed through a line memory for delay, and a pixel defect is detected and corrected based on the correlation difference. Is being processed. FIG. 3 illustrates such a conventional image processing apparatus with reference to FIGS. 3 and 4. FIG. 3 is a block diagram of the conventional image processing apparatus. FIG. 4 shows input / output signals shown in FIG. FIG. 5 is a waveform diagram converted and displayed on an analog signal. In FIG. 3, reference numeral 1 denotes a first memory for inversion. Reference numeral 2 denotes a delay second memory for delaying the output signal from the first memory 1 by one line. Reference numeral 3 denotes a detection circuit for comparing and detecting the correlation between the signal from the first memory 1 and the signal from the second memory 2. 4 is the second
A correction circuit for correcting a pixel from a signal from the memory 2 using a detection signal from the detection circuit 3.

[0005] The operation of the conventional image signal processing device configured as described above will be described below.

First, a mirror-inverted input primary color signal A is written in the first memory 1, and in the reading from the first memory 1, a memory output signal B which is inverted left and right is output by reading from the direction opposite to the writing direction. Let it. In this case, as the control method of the first memory, the next line signal is sequentially written into the vacant address after the reading at the same time as the reading, so that the capacity can be realized with a memory capacity of at least one line. The output signal B whose left and right are inverted
Through the second memory 2 for delaying one line, and outputs a delayed output signal C to the detection circuit 3. The output signal C from the second memory 2 is input to the detection circuit 3 at the same time.

The output signal B from the first memory 1, which has been inverted left and right, is also input to the detection circuit 3, and the two line data are used to detect the correlation between a specific pixel of interest and its surrounding pixels. The detection signal D is output to the correction circuit 4 for a signal pixel having a low correlation and particularly protruding. In accordance with the detection signal D from the detection circuit 3, the correction circuit 4 replaces the target pixel determined as a pixel defect with the average data of the peripheral pixels or a specific pixel of the peripheral pixels, for example, the preceding and succeeding pixels or the intermediate level pixel. The corrected signal E is output.

[0008]

However, in the above-mentioned conventional configuration, the primary color signal that has not been mirror-inverted is
Since a delay of one line is generated in the screen spatial position by the amount required for the first memory 1, the bonding is performed by shifting the spatial position by the delay difference in the bonding of the prisms. Therefore, as for the number of effective lines actually output as the final video, at least one effective line of the image sensor cannot be used due to the signal processing. In addition, in order to use all the effective lines of the image sensor, it is possible to delay a signal that has not been mirror-transformed by one line. In this case, the number of delay memories is equal to the number of primary-color signals that have not been mirror-transformed. There was a problem of necessity.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which a mirror-reversed primary color signal is subjected to inversion processing, and all signals including a non-mirror-reversed primary color signal are image-processed as input signals and output. It is another object of the present invention to provide an image signal processing apparatus that does not reduce the number of effective output lines of the final video without newly adding a delay adjustment memory.

[0010]

In order to achieve this object, an image signal processing apparatus according to the present invention disperses incident light into a plurality of primary color signals, and converts the primary color signals dispersed in a mirror-inverted state into the original signals. A reversing memory for reversing in the same direction as the incident light,
A pixel defect correction means for correcting a pixel defect by detecting a correlation between peripheral pixels including a vertical line direction using an output signal from the inversion memory and an output signal delayed through a delay line memory. An image signal processing apparatus, comprising: a control signal generating unit that outputs a predetermined control signal from a vertical reference signal and a horizontal reference signal; and a control unit that controls a signal output from the pixel defect correction unit and an output signal from the inversion memory. Selecting means for switching and selecting according to a control signal from the signal generating means.

With this configuration, a memory for delay adjustment is newly added even when the mirror-reversed primary color signal is inverted and all the signals including the non-mirror-reversed primary color signal are image-processed and output. It is possible to provide an image signal processing apparatus which does not reduce the number of effective output lines of the final video without adding the image signal processing device to the image signal processing device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, an incident light is divided into a plurality of primary color signals, and the primary color signals dispersed in a mirror-inverted state are stored therein to store the original incident light with the original incident light. First storage means for inverting in the same direction, second storage means for storing and delaying the signal from the first storage means, signals from the first storage means and the second storage means Detecting means for detecting a correlation with peripheral pixels including the vertical line direction using the signal from the detector, correcting means for correcting a pixel defect based on the correlation detected by the detecting means, and a predetermined signal based on the vertical reference signal and the horizontal reference signal. Control signal generating means for outputting the control signal of the above, and selecting means for switching and selecting the signal from the correcting means and the signal from the second storage means by the control signal from the control signal generating means. Yes,
There is no primary color signal mirror-inverted in the screen space position at the first effective line of the primary color signal that has not been mirror-inverted due to the delay difference caused by passing the primary color signal mirror-inverted from the vertical reference signal and horizontal reference signal through the inversion memory. Detect line
By switching only the detected line to the signal from the inversion memory one line before in the vertical line direction without passing through the pixel defect correcting means, it is possible to produce an output signal in which all highly correlated primary color signals are aligned. Having.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of an image signal processing apparatus according to the present invention. FIG.
FIG. 6 is a waveform diagram showing each input / output signal shown in FIG.

In FIG. 1, reference numeral 1 denotes a first memory serving as a first storage means for inversion for storing an input mirror-reversed primary color signal and inverting the same horizontally, and 2 denotes a first memory from the first memory 1. A second memory, which is a second storage means for storing the output signal and delaying the output signal by one line. 3
Reference numeral denotes a detection circuit which is a detection means for comparing an output signal from the first memory 1 and an output signal from the second memory 2 to detect a correlation in a specific target pixel and detect a prominent pixel defect. Reference numeral 4 denotes a correction circuit that is a correction unit that corrects a pixel defect based on a detection signal from the detection circuit 3 based on an output signal from the second memory 2. Reference numeral 5 denotes a counter which is a control signal generating means for generating a specific reference pulse (control signal) from the input horizontal reference signal and vertical reference signal. Reference numeral 6 denotes an output signal from the correction circuit 4 and a signal from the first memory 1. This is a selector as selection means for switching and outputting an output signal with an output pulse from the counter 5.

The operation of the image signal processing apparatus of the present embodiment configured as described above will be described with reference to FIGS.

First, the primary color signals A, which are separated in a mirror-reversed state and digitized, are written into the first memory 1 line by line. The signal written in the first memory 1 is read out as a left-right inverted signal B by reading from the address opposite to the writing. In this case, the first memory 1 can be realized with a memory capacity of at least one line by simultaneously writing and sequentially writing the next line signal to a vacant address after the reading. .

Inversion signal B read from the first memory 1
Is input to the delay second memory 2 for delaying one line, and is also input to the detection circuit 3 and the selector 4. The detection circuit 3 supplies the delay signal C from the second memory 2
In the detection of the correlation between a particular pixel of interest and its surrounding pixels using the two line data, the detection signal D is detected for a signal pixel having low correlation and particularly prominent.
Is output to the correction circuit 4.

In accordance with the detection signal D from the detection circuit 3, the correction circuit 4 determines the average data of the peripheral pixels or specific pixels of the peripheral pixels, for example, the preceding and succeeding pixels and the intermediate level. The pixel is replaced with a pixel, and a corrected signal E is output.

The horizontal reference signal H and the vertical reference signal J are input to the counter 5. The mirror 5 is a delay difference caused by passing the mirror-reversed primary color signals from the respective reference signals through the first memory 1 for reversal. A control pulse F corresponding to a line having no primary color signal which is mirror-reversed in terms of the screen spatial position in the leading effective line of the non-inverted primary color signal is created and output. The control pulse F output from the counter 5 is input to the selector 6. In the selector 6, an output signal E from the correction circuit 4 and an output signal B from the first memory 1 for inversion are input, and a control pulse is output from the two signals by a control pulse F from the counter 5. The output signal B is output during the period, and the output signal E from the correction circuit 4 is output during other periods.
By outputting the output signal G in which is selected, all the primary color signals can be aligned and output in the effective line range of the image sensor.

As described above, according to the present embodiment, a reference pulse corresponding to a line in which a primary color signal whose mirror surface has been inverted and a primary color signal which has not been inverted is not prepared at the head line of the effective signal from the image sensor is created. Normally, a signal corrected by passing through the second memory 2 for delay to correct a pixel defect is
By passing the signal through the inversion memory only during the reference pulse period and switching to the signal before the pixel defect correction, the effective lines of the mirror-reversed primary color signal corresponding to all the effective lines of the primary color signal not requiring the inversion memory are changed. This makes it possible to output and display all effective lines from the image sensor.

Incidentally, it is also possible to input a signal obtained by delaying the output of the second memory 2 by one line to the detection circuit 3 for detecting a pixel defect, and to detect a pixel defect from the signals of three lines.

On the other hand, since the primary color signal which has not been mirror-inverted does not require the first memory 1 for inversion, the final line in the screen space position is insufficient for the mirror-inverted primary color signal. 2 Counter 5 for writing control of memory 2
The same effect can be realized by a configuration in which the same line can be read out by stopping with the detection signal from.

[0024]

As described above, according to the present invention, mirror-reversed primary color signals are inverted by this configuration, and all signals including primary color signals that have not been mirror-reversed are image-processed as input signals and output. Even in this case, an excellent effect of being able to provide an image signal processing device that does not reduce the number of effective output lines of the final video without newly adding a delay adjustment memory is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image signal processing device according to a first embodiment of the present invention.

FIG. 2 is a waveform chart for explaining the operation of the image signal processing device according to the first embodiment;

FIG. 3 is a block diagram of a conventional image signal processing device.

FIG. 4 is a waveform chart for explaining the operation of the conventional image signal processing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st memory 2 2nd memory 3 Detection circuit 4 Correction circuit 5 Counter 6 Selector

Claims (2)

[Claims] A first storage unit that splits incident light into a plurality of primary color signals, stores the primary color signals dispersed therein in a mirror-inverted state, and inverts the same in the same direction as the original incident light; A second storage unit that stores and delays a signal from the first storage unit, and a peripheral pixel including a vertical line direction using the signal from the first storage unit and the signal from the second storage unit. Detecting means for detecting a correlation with the correction signal; correcting means for correcting a pixel defect based on the correlation detected by the detecting means; control signal generating means for outputting a predetermined control signal from a vertical reference signal and a horizontal reference signal; An image signal processing apparatus comprising: a selection unit that switches and selects a signal from the unit and a signal from the second storage unit according to a control signal from the control signal generation unit. 2. The method according to claim 1, wherein the incident light is divided into a plurality of primary color signals, the primary color signals separated in a mirror-inverted state are stored therein, and the signals are inverted in the same direction as the original incident light. Using the signal obtained by delaying the signal, the correlation detection with peripheral pixels including the vertical line direction is performed, the pixel defect is corrected, a predetermined control signal is output from the vertical reference signal and the horizontal reference signal, and the pixel defect is detected. An image signal processing apparatus, wherein a corrected signal and a signal delayed by a second storage unit are switched and selected by a control signal.