KR101255212B1 - Image capture/reproducing apparatus and method for supporting security function - Google Patents

Abstract

The present invention relates to an image capturing / playback apparatus and method, and more particularly, to an image capturing / playback apparatus and method for supporting a security function to enable playback only on a device capturing an image. An image capturing / reproducing apparatus supporting a security function includes a compression unit compressing photographed image data, a storage unit storing arbitrary first information among the compressed data, and a removable storage medium storing compressed data except the first information. And a decoding unit for decoding the selected compressed data and recording the security function setting indication data in an arbitrary area of the compressed data at the time of storing the image, and storing the compressed data except the first information and the first information and a removable storage medium. And a control unit for controlling the storage of the synthesized data, and synthesizing the first information and the compressed data extracted from the storage unit and the movable storage medium by the security function setting display data and outputting the synthesized first data to the decoding unit.

Description

Image capture / reproducing apparatus and method for supporting security function

1 is a block diagram showing a configuration of an image capturing / reproducing apparatus supporting a security function according to the present invention.

FIG. 2A is a diagram illustrating separate storage of compressed image data in the apparatus of FIG. 1, and FIG. 2B is a diagram illustrating compressed data synthesis for reproducing image data in the apparatus of FIG. 1.

3 is a flowchart illustrating an operation of an image capturing method supporting a security function according to the present invention.

4 is a flowchart illustrating an operation of a video reproducing method supporting a security function according to the present invention.

The present invention relates to an image capturing / playback apparatus and method, and more particularly, to an image capturing / playback apparatus and method for supporting a security function to enable playback only on a device capturing an image.

A method of capturing a desired image using a digital image capturing / reproducing apparatus is to identify a desired image and to store the image in a file form by pressing a shutter. There are several modes for setting the number of images and the number of files to be saved by pressing the shutter.The images at the time the shutter is pressed, the multiple images at predetermined intervals after the shutter is pressed, and the predetermined interval while the shutter is pressed A method of photographing a plurality of images is provided.

It is a common concept that multiple people view the pictures taken for the purpose of digital video recording / playback devices, but nowadays, when the individualism of society prevails, only you can see the videos you have taken or only certain people can see them. There is an increasing demand for such things.

To meet this demand, conventionally, one picture is divided into two independent files, each of which has image data, and when both files are in the same memory folder, they are played. I can't see it.

However, images captured by the above-described technology can be reproduced and viewed on the same type of camera that supports the memory card in which the images are stored, or if there is a program that can play the combined files together, the image can be captured. There is a problem that can not be solved security problems can play normally.

The technical problem to be achieved by the present invention is to record specific data from the compressed data in the storage unit and the removable storage medium in the device at the time of recording the captured image, and to specify from the storage unit and the removable storage medium at the time of image playback The present invention provides a video photographing / reproducing apparatus that supports a security function by allowing data and compressed data to be played back by combining data and compressed data.

An image capturing / reproducing apparatus supporting a security function according to the present invention includes a compressing unit for compressing photographed image data; A storage unit for storing any first information of the compressed data; A removable storage medium storing compressed data excluding the first information; A decoding unit for decoding the selected compressed data; And recording security function setting indication data in an arbitrary area of the compressed data when storing an image, and controlling storage of the compressed data except the first information and the first information to the storage unit and the movable storage medium. And a control unit for synthesizing the first information and the compressed data extracted from the storage unit and the movable storage medium by the security function setting display data and outputting the synthesized information to the decoding unit.

An image capturing / reproducing method supporting a security function according to the present invention includes a method of operating an image capturing / reproducing apparatus, the method comprising: (a) storing any first information of compressed image data in an internal storage unit; (b) recording security function setting indication data in any area of the compressed data; (c) storing compressed data in which the security function setting indication data is recorded, on the removable storage medium except for the first information; And (d) synthesizing, decoding, and reproducing the first information and the compressed data extracted from the storage unit and the removable storage medium by the security function setting indication data.

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

1 is a block diagram showing a configuration of an image capturing / reproducing apparatus for supporting a security function according to the present invention, which includes a lens unit 110, a charge-coupled device (CCD) 120, and an analog digital converter (ADC) 130. ), An image processor 140, a compressor 150, a storage 160, a memory card 170 as a removable storage medium, a decoder 180, a display 190, and a controller 200. .

In the present invention, the compression unit 150 is a DCT (discrete cosine transform) unit 150-1, a quantization processing unit 150-2, a variable length coding processing unit 150-3, a byte number calculating unit 150 -4), a quantization coefficient scale calculation unit 150-5, a quantization coefficient table 150-6, and a fixed length quantization coefficient table preparation unit 150-7.

The lens unit 110 receives light from an external light source and processes an image.

The CCD 120 accumulates the amount of light input through the lens unit 110 and outputs the image captured by the lens unit 110 according to the accumulated light amount in accordance with the vertical synchronization signal. Image acquisition of the digital image processing apparatus is performed by the CCD 120 for converting light reflected from a subject into an electrical signal. In order to obtain a color image using the CCD 120, a color filter is required, and a filter (not shown) called a color filter array (CFA) is mostly adopted. CFA has a structure arranged regularly by passing only one color light per pixel, and has various shapes according to the arrangement structure.

The ADC 130 converts an analog image signal output from the CCD 120 into a digital signal.

The image processor 140 processes the digitally converted image signal into a signal that can be stored and reproduced. The detailed operation of the image processor 140 will be described below.

Devices used in the CCD 120 and the CFA filter are sensitive to a change in temperature and generate a dark current according to the changed temperature, which includes an unwanted black level in the image signal. Thus, the image processor 140 removes the black level generated by the dark current as described above.

The image processor 140 also performs gamma correction. Since human vision reacts nonlinearly to brightness in accordance with Weber's law, when a given bit depth is given, linearly recording the brightness of the poster is known as posterization. This happens.

Therefore, in order to show the maximum image quality under a given bit depth, it is necessary to encode using a nonlinear function. As described above, encoding information in accordance with nonlinearity of human vision is referred to as gamma correction. The gamma correction of the image processor 140 gamma corrects and outputs an image signal input by the gamma curve. For example, the input luminance level of the 12-bit image signal is corrected to 8-bit luminance level.

The image processor 140 performs CFA interpolation to interpolate the Bayer pattern implemented by the RGRG line and the GBGB line of the gamma corrected predetermined data into the RGB line. The CFA interpolation of the image processor 140 first reconstructs the G channel from pixels having only the R or B channel value, and then fills the empty values in the order of the B channel, the R channel, or the R channel, the B channel in order. Restore the three channels G, B.

The image processing unit 140 converts the interpolated RGB signal into a YUV signal, filters the Y signal by a high-band filter, and sharply processes the image, and uses the standard color coordinate system to adjust the color values of the U and V signals. Perform color correction to correct and remove their noise.

All of the operations of the image processor 140 operate under the control of the controller 155.

The compressor 150 compresses the image data output from the image processor 140 to generate an Exifable Imgae File Format (Exif) file.

The DCT unit 150-1 performs discrete cosine transform on the image data output from the image processor 140, converts the image data from the time axis component to the frequency axis component, and supplies the converted image data to the quantization processor 150-2.

The quantization processing unit 150-2 adjusts the video data compression ratio based on the quantization coefficient table supplied from the fixed-length quantization coefficient table creating unit 150-7, and converts the image data into the variable length encoding processing unit 150-3. Supply.

The variable length encoding processing unit 150-3 variable length encodes the image data using a variable length code such as Huffman coding and outputs the compressed image data.

The variable length encoding processor 150-3 is also connected to the byte number calculating unit 150-4, and the compressed image data output from the variable length encoding processing unit 150-3 is the byte number calculating unit 150-4. Also supplied.

The byte number calculating unit 150-4 calculates the number of bytes for one screen of the compressed image data and supplies the result to the quantization coefficient scale calculating unit 150-5.

The quantization coefficient scale calculation unit 150-5 calculates how much the input byte number deviates from the expected value of the number of bytes after compression of the captured image data, and adjusts the amount of compression output (quantization coefficient based on the calculation result). Scale), and the calculated quantization coefficient scale is supplied to the fixed-length quantization coefficient table preparation unit 150-7.

The fixed-length quantization coefficient table generator 150-7 is based on the quantization coefficient scale supplied from the quantization coefficient scale calculator 150-5 and the predetermined quantization coefficient table supplied from the quantization coefficient table 150-6. A new quantization coefficient table is created and supplied to the quantization processor 150-2.

The quantization processor 150-2 adjusts the compression ratio of the image data again based on the new quantization coefficient table supplied from the fixed-length quantization coefficient table generator 150-7.

By repeating the above compression process, the compression unit can compress the input video data up to a predetermined data size.

Exif files compressed in the compression unit are shown in FIGS. 2A and 2B.

In FIG. 2A and FIG. 2B, an Exif file includes a start of imgae (SOI), an application data (APP), a fine quantization table (DQT), a fine Huffman table (DHT), a start of frame (SOF), a start of scan (SOS), And markers including an end of frame (EOI) and a structure of compressed data. The markers other than the compressed data are also called headers, and the APP region of the markers includes additional information such as the date and time of capturing the compressed image data, a camera name, or a thumbnail.

In the present invention, when the user selects the security function shooting and photographs the image, the index of the security function setting indication data and the quantization coefficient table is recorded in the APP area.

When a user selects a menu for security function shooting and captures an image, a series of image processed image data is compressed by the compression unit 150 to generate an Exif file. At this time, the control unit 200 extracts the quantization coefficient table information (arbitrary first information) stored in the DQT region from the Exif file and stores it in the storage unit 160 of the device, and the predetermined data, Record 0 or F as meaningless data.

The controller 200 stores the Exif file in which meaningless data is recorded in the DQT area in the memory card 170 as a removable storage medium.

Therefore, when the security function shooting is performed, as shown in FIG. 2A, the storage unit 160 stores quantization coefficient table information of the DQT region extracted from the Exif file, and the data of the DQT region is meaningless in the memory card 170. The recorded Exif file is saved.

Here, the quantization coefficient table information stored in the storage unit 160 can be reproduced only in the device where the image is captured, since the normal image is reproduced only when it is applied at the time of image decoding. And playback.

Subsequently, when an image having a security function set, i.e., an arbitrary Exif file is selected from the memory card 170, when the image is reproduced, the control unit 200 checks the security function setting display data recorded in the APP area of the Exif file. Check that the selected file has security features enabled.

When the security function setting indication data is recorded in the APP area, the control unit 200 reads the index of the quantization coefficient table recorded in the APP area, and as shown in FIG. 2B, the quantization coefficient table from the storage unit 160. Extract the data and record the quantization coefficient table information in the DQT area of the Exif file in which meaningless data is recorded, thereby regenerating a normal Exif file.

The decoding unit 180 performs Huffman coding on the compressed data of the regenerated normal Exif file under the control of the control unit 200, performs inverse quantization based on the quantization coefficient table, and performs inverse quantized data. Inverse discrete conversion is performed to restore the original data and output the original data to the display 190.

When the image data is reproduced on the display 190, the control unit 200 displays a predetermined object, for example, an icon indicating the image on the display 190 with the security function, and is currently playing the image. The image may indicate that the security function is set.

3 is a flowchart illustrating an operation of an image capturing method supporting a security function according to the present invention, and all steps operate under the control of the controller 200.

When the security function setting menu is selected by the user and the image is captured, the image data photographed under the control of the controller 200 is converted into digital data (step 310).

The converted digital image data is subjected to a series of processing operations for storing and reproducing the image in the image processing unit 140. Since the detailed description thereof is disclosed above, it is omitted (step 320).

Thereafter, under the control of the control unit 200, the compression unit 150 compresses the image data to generate an Exif file, and a detailed description thereof will be omitted since it is disclosed above (step 330).

The control unit 200 extracts the quantization coefficient table information stored in the DQT region from the Exif file and stores it in the storage unit 160 in the device (step 340). Since the quantization coefficient table information stored in the storage unit 160 must be applied at the time of image decoding, the normal image is reproduced. Therefore, the quantization coefficient table information stored in the storage unit 160 can be reproduced only in the device where the image is captured. Will be.

Then, the control unit 200 records the index of the security function setting indication data and the quantization coefficient table in the APP area of the Exif file (step 350).

Thereafter, the controller 200 records predetermined data, that is, meaningless data 0 or F, in the DQT area of the Exif file, and stores the Exif file on the memory card 170 as a removable storage medium.

4 is a flowchart illustrating an operation of a video reproducing method supporting a security function according to the present invention, and all the steps operate under the control of the controller 200.

If a random image is selected for the user selection, the controller 200 calls an arbitrary Exif file selected from the memory card (step 410).

Subsequently, the control unit 200 checks the security function setting display data recorded in the APP area of the Exif file, checks whether the security function is set in the selected file, and records the security function setting display data in the APP area. In step 420, the index of the quantization coefficient table recorded in the APP area is read.

Then, the control unit 200 extracts the quantization coefficient table stored in the index of the storage unit 160 and records the quantization coefficient table information in the DQT region of the Exif file in which meaningless data is recorded, thereby regenerating the normal Exif file. Create (step 430)

When the normal Exif file is regenerated, the controller 200 performs Huffman coding on the compressed data of the Exif file, performs inverse quantization based on the quantization coefficient table, and performs inverse discrete transform on the inverse quantized data. Restore the original data and output the original data to the display 190 (step 440).

In this case, the controller 200 displays a predetermined object representing the security function on the image, for example, an icon together with the image on the display 190 to indicate that the image currently being played is the security function set image. Can be.

As described above, according to the present invention, when storing the captured image, the specific data is recorded from the compressed data into the storage unit and the movable storage medium inside the apparatus, and when the image is reproduced, the specific data is specified from the storage unit and the movable storage medium. By synthesizing and playing back data and compressed data, it can be played back only on the device where the video was taken, creating an effect that can enhance security functions.

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (14)

As a video recording / playback device, A compression unit compressing the captured image data; A storage unit which stores first information extracted from the compressed data; A removable storage medium storing secure data in which the first information of the compressed data is replaced with second information; A decoding unit for decoding the compressed data; And Recording security function setting indication data in an application area of the compressed data when storing an image, controlling storage of the first information and the security data to the storage unit and a removable storage medium; And a controller configured to replace the second information with the first information stored in the storage unit and output the data to the decoding unit in response to the security function setting display data when the image is reproduced. Video recording / playback device with security function The method of claim 1, wherein the compression unit A discrete conversion unit performing discrete cosine transform on the photographed image data and converting the result into frequency components; Quantization coefficient table information in which quantization coefficients for replacing data of the frequency component with one representative value are stored; A quantization processor that adjusts a compression ratio of the frequency component data based on the quantization coefficients; And And a variable length encoding processing unit for variable length encoding the frequency component data using the Huffman code and outputting the compressed component data as the compressed data. The method of claim 2, wherein the decoding unit Huffman coding is performed on the compressed data, inverse quantization is performed based on the quantization coefficient table information, and inverse discrete transformation is performed on the inverse quantized data to restore the photographed image data. Video recording / playback device that supports the security function. The method of claim 3, wherein the first information is And / or the quantization coefficient table information. The method of claim 3, wherein the second information is Video recording / playback device that supports a security function, characterized in that the meaningless data. The method of claim 3, wherein the security function setting indication data And an index of the quantization coefficient table information. The method of claim 6, wherein the control unit At the time of playing the image, the image capturing / reproducing apparatus for supporting a security function, wherein the quantization coefficient table information of the security data stored in the movable storage medium is replaced with the quantization coefficient table information of the storage unit recorded in the index. . The method of claim 3, wherein the control unit At the time of playing the image, the image capturing / reproducing apparatus for supporting a security function, characterized in that for displaying the image with the security function is set to display an object representing this with the image. As an operation method of an image capture / playback apparatus, (a) storing first information extracted from the compressed image data in an internal storage unit; (b) recording security function setting indication data in an application area of the compressed image data; (c) replacing the first information of the compressed image data with second information and storing the security data on which the security function setting indication data is recorded on a movable storage medium; And (d) outputting the compressed image data by replacing the second information with the first information stored in the storage unit in the security data stored in the storage medium according to the security function setting indication data; Video recording / reproducing method for supporting a security function comprising the step of decoding the decoded video data. The method of claim 9, wherein the first information is And a quantization coefficient table information for storing quantization coefficients for replacing the image data with one representative value when the image data is compressed. The method of claim 10, wherein the second information is Video recording / playback method that supports a security function, characterized in that the meaningless data. The method of claim 10, wherein the security function setting indication data And an index of the quantization coefficient table information. The method of claim 12, wherein in step (d) And quantization coefficient table information of the security data stored in the movable storage medium with quantization coefficient table information of the storage unit recorded in the index. The method of claim 9, wherein in step (d)  And an object indicating the same with respect to the image in which the security function is set, together with the image.

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