KR19980067642A - High Sensitivity CD Camera - Google Patents

Abstract

The present invention relates to a high sensitivity CD camera, comprising: an imaging device for converting light into an electrical signal and outputting the light; A synchronizer for controlling an electric signal output from the image pickup device by the control of the controller; An amplifying unit which receives an electric signal output from the image pickup device and amplifies and outputs the electric signal; An analog / digital converter for receiving a signal output from the amplifier and converting the signal into a 10-bit digital signal; An image memory configured to receive an upper 8-bit digital signal among the 10-bit digital signals output from the analog / digital converter and store the same according to the control of the controller; The 10-bit digital signal output from the analog / digital converter is input, and the 8-bit data output from the image memory and the 10-bit data in which the 2-bit random number is output from the random number generator are input. A multiplexer for selecting and outputting input data according to the input; Including a signal processing unit that receives data output from the multiplexer and outputs an image signal under the control of the control unit, the number of image memories is reduced, thereby reducing the overall cost, thereby improving product quality.

Description

High Sensitivity CD Camera

The present invention relates to a high sensitivity charge coupled device (CCD) camera. More specifically, when light intensity is bright, 10-bit data is not stored in the image memory. Therefore, it relates to a high sensitivity CD camera which stores only the upper 8 bits of the 10 bits of data in the image memory.

Hereinafter, a conventional CD camera will be described with reference to the accompanying drawings.

1 is a block diagram of a conventional CD camera.

As shown in FIG. 1, the configuration of a conventional CD camera includes: an imaging device 1 for converting light into an electrical signal and outputting the light; A synchronizer 3 for controlling the output of the electrical signal from the imaging device 1; An amplifier 5 which receives an electric signal from the imaging device 1 and amplifies and outputs the electric signal; An analog / digital converter 7 which receives a signal output from the amplifier 5, converts it into a digital signal, and outputs the digital signal; An image memory section 9 for storing a digital signal output from the analog / digital converter 7; A signal processor 11 for receiving data stored in the image memory 9 and outputting an image signal; A control unit 13 connected to the synchronization unit 2 and the signal processing unit 11 for control; It is connected to the control unit 13 and includes a storage unit 15 for storing temporary data or source code of a program that the control unit 13 performs.

In this case, the image memory unit 9 is a high-order image which is connected to an upper 8-bit signal to store the upper 8-bit signal to store this signal because the digital signal output from the analog / digital converter 7 is a 10-bit signal. A memory 17 and a lower picture memory 19 connected to and stored in the remaining lower 2 bits of the 10 bits.

In addition, a CD is generally used as the imaging device 1.

The operation of the conventional CD camera is as follows.

First, the image pickup device 1 converts light input from the outside into an electrical signal and outputs the light. When the illuminance is brighter than about 2 lux, the time of less than 1/60 second is similar to that of a normal CD camera. Accumulate at intervals, and if it is not brighter than 2 lux, that is, in low light, accumulate at intervals of 1/60 seconds or more, and output an electric signal under the control of the synchronizer 3.

The electrical signal output from the image pickup device 1 is amplified by the amplifier 5, converted into a digital signal by the analog / digital converter 7, and output.

The digital signal output from the analog / digital converter 7 is 10 bits of data, of which the upper 8 bits of data are stored in the upper image memory 17, and the remaining lower 2 bits are stored in the lower image memory 19.

On the other hand, a monitor is usually used as an image display device, and an amount corresponding to one screen of the monitor is called a frame, and one frame is composed of two fields.

The frame or field memory is used as the memory of the upper image memory 17 and the lower image memory 19 of the image memory unit 9. When the frame memory is used, the vertical resolution is good, but the memory does not respond well to the movement of the object. It takes a lot.

Field memory, on the other hand, has a lower vertical resolution but is less sensitive to movement and costs half the memory than frames.

The data stored in the image memory section 9 is output by the control of the control section 13 and input to the signal processing section 11, and the signal processing section 11 generates and outputs the input data as an image signal.

If it is not low light, the data output from the analog-to-digital converter 7 may be input directly to the signal processing section 6 without being stored in the image memory section 9.

However, in low light, the time for storing light by the imaging device 1 by the control of the control unit 13 is extended to 1/60 second or more.

In this way, the period of the signal output from the image pickup device 1 is slower than 1/60 second, but if it is seen as it is, the screen blemishes cannot be seen. Therefore, once stored in the image memory unit 9, one frame or field is stored. When the signal is output to the signal processing unit 11.

However, in the above-described conventional technique, the image memory unit 9 of a field or frame can store the data in the unit of 8 bits like the normal memory, but the data output from the analog-to-digital converter 7 is 10 bits of data. This requires one more field memory or frame memory to store two bits of data.

This not only doubles the cost of using the memory, but also causes a problem in space of the substrate occupied by the memory and an increase in power consumption. In particular, an increase in power consumption is accompanied by a heat generation problem, the image pickup device 1 may cause a fatal defect in the product because the noise increases when the ambient temperature rises.

Accordingly, an object of the present invention is to solve the above-described problems. In the case of light intensity, 10-bit data is not stored in the image memory. The present invention provides a high sensitivity CD camera that stores only the upper 8 bits of data in the image memory.

1 is a block diagram of a conventional CD camera,

2 is a block diagram of a high sensitivity CD camera according to an embodiment of the present invention.

As a means for achieving the above object, the present invention,

Control means;

An imaging device for converting light into an electrical signal and outputting the light;

Synchronizing means for controlling an electric signal output from said image pickup device by control of said control means;

Amplifying means for receiving and amplifying and outputting an electric signal output from the imaging device;

An analog / digital converting means for receiving a signal output from the amplifying means, converting the signal into a digital signal, and outputting the digital signal;

Image storage means for receiving a part of the digital signal output from the analog / digital conversion means and storing the signal under the control of the control means;

Multiplexing means for receiving a digital signal output from the analog / digital converting means, receiving data output from the image storage means, and selecting and outputting the input signal according to a determination of the illuminance state of the control means;

And signal processing means for receiving data output from the multiplexing means and outputting an image signal under the control of the control means.

Here, the present invention is a means for generating and replacing a random number for the lower two-bit data in order to minimize the deterioration of the image quality, that is, stored in the image storage means of the digital signal output from the analog / digital conversion means It further comprises a random number generating means for generating by said control means a random number for substituting a signal which is not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a high sensitivity CD camera according to an embodiment of the present invention.

As shown in FIG. 2, the high-sensitivity CD camera according to the embodiment of the present invention includes a control unit 20 for controlling the overall operation of the camera; An imaging device 30 for converting light into an electrical signal and outputting the light; A synchronization unit 40 for controlling an electric signal output from the image pickup device 30 by the control of the control unit 20; An amplifier 50 which receives an electric signal output from the imaging device 30 and amplifies and outputs the electric signal; An analog / digital converter 60 which receives a signal output from the amplifier 50 and converts the signal into a 10-bit digital signal; An image memory (70) for receiving an upper 8-bit digital signal among the 10-bit digital signals output from the analog / digital converter (60) and storing the received 8-bit digital signal under the control of the controller 20; Random number generator for generating, by the control of the control unit 20, a random number for replacing the remaining lower 2-bit digital signal not stored in the image memory 70 among the 10-bit digital signals output from the analog / digital converter 60. 80; The 10-bit digital signal output from the analog / digital converter 60 is input, and the 10-bit data obtained by adding the 8-bit data output from the image memory 70 and the 2-bit random number output from the random number generator 80 is input. A multiplexer 90 which selects and outputs input data according to the determination of the illuminance state of the controller 20; A signal processor 100 which receives data output from the multiplexer 90 and outputs an image signal under the control of the controller 20; And a storage unit 110 connected to the control unit 20 to store temporary data or source code of a program executed by the control unit 20.

The operation of the high sensitivity CD camera according to the embodiment of the present invention by the above configuration is as follows.

First, the image pickup device 30 converts light input from the outside into an electrical signal and outputs it.

At this time, the controller 20 determines the state of the illuminance, and when the illuminance is dark, data accumulation is necessary in the image memory 70, so that the light accumulated in the image pickup device 30 by controlling the synchronizer 40 is 1. Allow 60 seconds or more to accumulate.

The electric signal output from the image pickup device 30 is amplified by the amplifier 50, converted into a 10-bit digital signal by the analog-to-digital converter 60, and output.

The 10-bit digital signal output from the analog / digital converter 60 is input to the multiplexer 90 and the image memory 70.

If it is determined by the controller 20 that the illuminance is bright, a 10-bit digital signal input directly from the analog / digital converter 60 to the multiplexer 90 is selected by the control of the controller 20 and the signal processor 100 is controlled. Is input to generate an image signal.

However, if the illuminance is dark, the upper 8-bit data of the 10-bit digital signal output from the analog / digital converter 60 is stored in the image memory 70.

The lower 2 bits of the digital signal are then discarded.

This is because low-light is relatively dark and noisy, so even if the lower two bits are discarded, the effect is not significant.

However, when the illuminance is bright, since 10-bit data cannot be reproduced with only 8 bits, all 10-bit data is required.

As described above, an image signal can be generated using only low-light upper 8-bit data. However, the random number generator 80 generates a random number corresponding to 2 bits and adds the upper 8 bits to the multiplexer 90 to input the image signal. Minimize signal degradation.

As described above, the upper 8-bit data output from the image memory 70 and the lower two-bit data generated from the random number generator 80 are added together, so that a total of 10 bits of data are input to the multiplexer 90. 20 is selected by the control of the control unit 20 and input to the signal processing unit 100 to generate an image signal.

As described above, the low-order low two bits are discarded without storing, thereby eliminating the need for using an image memory for storage.

As described above, in the embodiment of the present invention, when the light intensity is bright, 10-bit data is not stored in the image memory, and when the light intensity is dark, the deterioration of image quality is not noticeable. High-sensitivity CD cameras that reduce the overall cost by reducing the number of image memories by storing and storing them in the image memory, and generating random numbers for the lower two-bit data in order to minimize image quality deterioration. Can be provided.

Claims (4)

Control means; An imaging device for converting light into an electrical signal and outputting the light; Synchronizing means for controlling an electric signal output from said image pickup device by control of said control means; Amplifying means for receiving and amplifying and outputting an electric signal output from the imaging device; An analog / digital converting means for receiving a signal output from the amplifying means, converting the signal into a digital signal, and outputting the digital signal; Image storage means for receiving a part of the digital signal output from the analog / digital conversion means and storing the signal under the control of the control means; Multiplexing means for receiving a digital signal output from the analog / digital converting means, receiving data output from the image storage means, and selecting and outputting the input signal according to a determination of the illuminance state of the control means; And a signal processing means for receiving data output from the multiplexing means and outputting an image signal under the control of the control means. The high-sensitivity CD camera according to claim 1, wherein the digital signal output from the analog / digital converting means is 10 bits, and the upper 8 bits, which are some signals of the 10-bit digital signal, are stored in the image storing means. The method of claim 2, further comprising a random number generating means for generating a random number of two bits to replace the remaining lower two bits of the signal not stored in the image storage means of the 10-bit digital signal output from the analog / digital conversion means High sensitivity CD camera, characterized in that it comprises. The method of claim 3, wherein the multiplexing means selects and outputs a 10-bit digital signal input from the analog / digital converting means by the control of the control means when the illuminance is bright, and controls the control means when the illuminance is dark. And selecting and outputting input data in which the output of the image storing means and the output of the random number generating means are combined.