KR20050032196A - Method for compressing camera image - Google Patents

Abstract

A method for compressing a camera image is provided to considerably reduce the storing capacity of image data by successively compressing the image data using a plurality of encoders, simultaneously generating an encoder-classified intrinsic characteristic value, and storing only the last compression value and the intrinsic characteristic value in a memory. Image information data are acquired(S301). The image information data are compressed as the most significant unit compression value and the most significant specific value through a successive unit encoding process(S302). A number is counted whenever the least significant unit of the image information data is applied to the encoding process to generate a TPV(Total Pixel Value)(S303). The last compression value including the unit compression value, the most significant specific value and the TPV is generated(S304). The generated last compression value is stored(S305).

Description

How to compress camera image {METHOD FOR COMPRESSING CAMERA IMAGE}

The present invention relates to a camera image compression method, and more particularly, to a camera image compression method that can reduce the storage capacity of the image data through stepwise compression in storing the image data.

1 is a block diagram illustrating a conventional camera system, which will be described below.

Such a camera system includes a camera unit 110 for capturing a picture to obtain image data; A format transformer 120 for transforming / compressing image data of the camera unit 110 to generate image information data; An LCD module 130 for displaying image information data of the format transformer 120; A main control unit 140 which receives image information data of the format transformer 120 and designates address data and stores the address data in the memory 150; And a memory 150 for storing the image information data received from the main control unit 140 at the designated address according to the address data designated by the main control unit 140.

However, the data storage method adopted by the conventional camera system described above has a problem that the size occupying the memory is large because it allocates and decompresses and compresses information corresponding to each pixel to store image data of the camera. have.

In order to solve the above problems, the present invention, in the storage of camera image data, by sequentially compressing the image data using a plurality of encoders at the same time to generate a unique characteristic value for each encoder, the final compression value and the unique characteristic It is an object of the present invention to provide a camera image compression method that can significantly reduce a storage capacity of image data by storing only a value in a memory, compared to allocating and storing a plurality of bits per pixel.

In order to achieve the above object, the camera image compression method of the present invention includes a camera image compression method comprising a decoding step and an encoding step, wherein the encoding step comprises: obtaining image information data; Compressing the image information data into a highest unit compression value and a highest specific value through a sequential unit encoding process; Generating a TPV by counting each least significant unit of the image information data during an encoding process; Generating final compressed data including the unit compression value, the highest specified value and the TPV; And storing the final compressed data.

In addition, the camera image compression method of the present invention to achieve the above object, the camera image compression method comprising a decoding step and the encoding step, the decoding step, the final compressed data is input; Determining a bit number based on the final compressed data and performing sequential unit decoding to decode the final compressed data according to the bit number; And recovering the image information data as a result of the sequential unit decoding.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. .

First, Figure 2 is a block diagram showing a camera image compression apparatus according to an embodiment of the present invention, the camera image compression apparatus of the present invention, the camera unit 210, the format transformer 220, the LCD module 230 , An image compressor 240, a main controller 250, and a memory 260.

The camera unit 210 captures a picture, acquires image data, and outputs the image data to a format transformer 220 to be described later.

In addition, the format transformer 220 transforms and compresses the image data input from the camera unit 210 to generate image information data, and the LCD module 230 which describes the image information data later and an image compression which will be described later. It serves to output to the unit 240.

The LCD module 230 displays image information data input from the format transformer 220.

In addition, the image compressor 240 compresses the image information data input from the format transformer 220 through a sequential encoding process for each unit to generate final compressed data, and generates a specific value for each process, Outputting the final compressed data and the plurality of specific values, receiving the stored final compressed data and the plurality of storage specific values stored in the memory 260 to be described later, and performing a sequential decoding process which is a reverse process of the sequential encoding process, The image information data is generated as a result value of the sequential decoding process.

The main controller 250 controls the image compressor 240 and the LCD module 230, receives the final compressed data and the plurality of specific values from the image compressor 240, and will be described later. The memory 260 reads the stored final compressed data and the plurality of storage specific values from the memory 260, which will be described later, and delivers them to the image compressor 240. Here, the main controller 250 may generate a clock signal having a reference frequency for generating the specific value, and output the clock signal to the image compressor 240.

In addition, the memory 260 stores the final compressed data and the plurality of specific values input from the main controller 250 as the storage final compressed data and the plurality of storage specific values.

3 is an operation flowchart illustrating an encoding process of a camera image compression method according to an embodiment of the present invention.

First, a format transformer 220 of a Large Scale Intergration (LSI) in which image data (YUV format, etc.), which is a digital signal input from the camera unit 210, is mounted in the LCD module 230 (in FIG. 2, the LCD module 230 for convenience). Separately from)). Thereafter, the image data is converted into image information data in a format suitable for display (display form such as RGB) in the format transformer 220 (S301).

Thereafter, the image information data is compressed to the highest unit compression value and the highest specific value through a sequential unit encoding process (S302). Here, the sequential unit encoding process will be described in detail with reference to FIG. 4 as follows.

First, the image information data is input in units of pixels (S412).

Thereafter, the data input in units of pixels is compressed with reference to a specific value generated by a count value by a clock signal, and as a result, a compression value for each pixel unit and a specific value for each pixel unit are generated (S422). Here, the format of the compression value for each pixel unit and the specific value for each pixel unit are shown in Table 1 below.

DCV (Data Compress Value) bit Compression specific value bits

Thereafter, the compressed value for each pixel unit is compressed with reference to the specific value for each pixel unit, and as a result, the highest unit compression value and the highest specific value are generated (S432). Here, the format of the most significant unit compression value and the most significant unit specific value is shown in Table 2 below.

Pixel Compress Value (PCV) bit Compression specific value bits

At this time, the lowest unit of the image information data is counted each time the encoding process is applied to generate TPV (S303).

Thereafter, final compressed data including the unit compression value, the highest specific value and the TPV is generated (S304). The format of the most significant unit compression value and the most significant unit specific value is shown in Table 3 below.

TPV bit PCV bit

Thereafter, the final compressed data is stored in the memory 260 (S305).

5 is an operation flowchart illustrating a decoding process of a camera image compression method according to an embodiment of the present invention.

First, final compressed data including the TPV used to determine the bit number is input (S501).

Thereafter, the final compressed data is received and sequential unit decoding is performed (S502). Here, the sequential unit decoding will be described in detail with reference to FIG. 6 as follows.

First, the most significant unit compression value is decoded according to the bit number with reference to the most significant specific value, and the result value is output as a specific value for each pixel unit and a compressed value for each pixel unit (S612). Here, the bit number is a value obtained by dividing the specific value for each pixel unit and the compression value for each pixel unit by the TPV.

Thereafter, the compressed value for each pixel unit is decoded according to the bit number with reference to the specific value for each pixel unit, and then the result value is output (S622).

Thereafter, the video information data is recovered as a result of sequential unit decoding (S503).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings shown.

According to the present invention, in the camera image data storage, by sequentially compressing the image data using a plurality of encoders and generating unique characteristic values for each encoder, only the final compression value and the unique characteristic values are stored in the memory. There is an advantage that the storage capacity of the image data can be significantly reduced as compared to the transmission / storage by allocating a plurality of bits per pixel.

1 is a block diagram showing a conventional camera system,

2 is a block diagram illustrating a system to which a camera image compression method according to an embodiment of the present invention is applied;

3 is a flowchart illustrating an encoding process of a camera image compression method according to an embodiment of the present invention;

4 is an operation flowchart showing a unit encoding process according to FIG. 3;

5 is an operation flowchart illustrating a decoding process of a camera image compression method according to an embodiment of the present invention;

6 is a flowchart illustrating a unit decoding process according to FIG. 5.

Explanation of symbols on the main parts of the drawings

210: camera unit 220: format transformer

230: LCD module 240: video compression unit

250: main controller 260: memory

Claims (5)

In the camera image compression method comprising a decoding step and the encoding step, The encoding step, Obtaining image information data; Compressing the image information data into a highest unit compression value and a highest specific value through a sequential unit encoding process; Generating a TPV by counting each least significant unit of the image information data during an encoding process; Generating final compressed data including the unit compression value, the highest specified value and the TPV; And Storing the final compressed data Camera image compression method comprising a. The method of claim 1, The sequential unit encoding process, Inputting the image information data in pixel units; Compressing data input in units of pixels with reference to a specific value generated by a count value of a clock signal, and as a result, generating a compression value for each pixel unit and a specific value for each pixel unit; And Compressing the compression value for each pixel by referring to the specific value for each pixel unit, and as a result, generating the highest unit compression value and the highest specific value Camera image compression method comprising a. In the camera image compression method comprising a decoding step and the encoding step, The decoding step, Inputting final compressed data; Determining a bit number based on the final compressed data and performing sequential unit decoding to decode the final compressed data according to the bit number; And Restoring image information data as a result of sequential unit decoding Camera image compression method comprising a. The method of claim 3, The final compressed data includes a TPV used to determine a bit number, wherein the bit number is a value obtained by dividing the specific value for each pixel unit and the compression value for each pixel unit by the TPV. Camera image compression method, characterized in that. The method of claim 3, The unit decoding process, Referring to the most significant specific value, decoding the most significant unit compression value according to the bit number, and outputting the result as a specific value for each pixel unit and a compression value for each pixel unit; And Decoding the pixel-specific compressed value according to the bit number by referring to the pixel-specific value, and outputting a result value Camera image compression method comprising a.