JPS6345976A - Picture decoder - Google Patents

Abstract

PURPOSE:To reduce decoding processing time by providing plural line memories having a capacity for one line of picture signal and plural decoding processing sections, dividing the code in the unit of line before the decoding processing thereby applying parallel decoding processing in the unit of lines. CONSTITUTION:A code corresponding to a 1st line and a code corresponding to 2nd line outputted from a BOL detection section 1 to code buffers 2, 3 are inputted respectively to decoding processing sections 4, 5. After they are decoded, the result is inputted to line memories 6, 7. When the decoding of both lines is finished, the content of the line memories 6, 7 is outputted to an picture memory 9 by the control of the control section 10. The similar operation is applied as 3rd, 4th, 5th and 6th lines. Thus, the coding time is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 11 The present invention relates to an image decoder, and more specifically, the present invention relates to an image decoder.
In facsimile machines and image storage devices that handle electric signals quantized into binary levels of ``0'' and ``1'', decoding converts information converted into codes during transmission or storage into white and black image signals. It is related to vessels.

Conventional technology Conventionally, in a decoder that decodes an image signal that has been binarized into "0" and "1'" and then encoded, a single decoder reads consecutive codes and performs the decoding process. The image signals for one line were sequentially output.

Problems to be Solved by the Invention However, in the conventional image decoder described above, consecutive codes are read in and decoding is performed by one decoder, so the decoding process for one line is difficult. Since the decoding process of the code corresponding to the next line cannot be performed until the decoding process is completed, there is a drawback that the decoding process time is long5.
- Therefore, the purpose of the present invention is to
To provide a new image decoder that makes it possible to significantly shorten the decoding processing time by processing multiple lines simultaneously.Means for solving the problems.To achieve the above object. , the image decoder according to the invention is
a BOL detection unit that detects the end of one line of code;
It is configured with a plurality of code buffers that store codes for one line, a plurality of line memories with a capacity for one line of image signals, and a plurality of decoding processing units. The code is divided into 1 line layers, and the first line is decoded by the first decoding processor, while the second line is decoded by the second decoder, so decoding is performed line by line in parallel. It is characterized by

EXAMPLE Next, a preferred embodiment of the present invention will be specifically described with reference to page 4.

FIG. 1 is a block diagram showing an embodiment of an image decoder according to the present invention, which includes two code buffers, two decoding processing units, and three line memories.

Referring to the first) ffi, the EOI detection unit 1 detects the EOL from the input code string.
, in the Cf'lTT Recommendation, is in the form of 1) 1 par added to consecutive "0's".

A pattern in which 1) or more °“0”°s occur in a code is E.
(Using the fact that it does not exist outside of the IL, it detects Rot, and separates the code string line by line. The EOL detection unit 1
In accordance with the activation of the control unit I1), the code string is alternately outputted to the code buffer 2 and the code buffer 3 in units of one line.

First, the operation during -dimensional decoding will be described.

E (The code corresponding to the first line and the code corresponding to the second line output from the IL detection unit 1 to the code buffer 2 and code buffer 3 are respectively output to the decoding processing unit 4 and the decoding processing unit 5J\
When the decoding of the six lines, which are input and decoded by them and then input to the line memory 6 and line memory 7, is completed, the line memory 6,
The contents of line memory 7 are output to image memory 9. Thereafter, the same operations as in boxes 3, 4, in, and 5th and 6th lines are performed.

Next, two-dimensional decoding will be explained. Now, the code corresponding to the rl-th line is stored in the code buffer 2,
It is assumed that a code corresponding to the (n+1>th line) is input to the code buffer 3. Also, the line memory 6 stores the image signal of the (n-1)th line decoded by the preceding and following code operations. In this state, the control unit 10 activates the decoding processing units 4 and 5.The decoding processing unit 4 receives the code information corresponding to the nth line from the code buffer 2, and the code information corresponding to the (rl-1)th line from the line memory 6. ) line, the nth line is decoded and sent to the line memory 7. The decoding processing unit 5 receives the (n+)th line from the code buffer 3.
1 > The code corresponding to the line and the image signal of the n-th line decoded by the decoding processing unit 4 and stored in the line memory 7 are manually inputted sequentially from the line memory 7 to the (n+
1) Decode the line and send the result to line memory 8. The decoding processing unit recognizes the end of the line by detecting EOL. When the reprinting of the image processing section is completed, the control section 1
0 is the r-th stored in line memory 7 and line memory 8.
1st line The image signal of the (n1)th line is sent to the image memory 9. At the same time, the EOL detection unit 1 is activated, and the code corresponding to the (n+2)th light>' and the code corresponding to the (n+2)th light
) The codes corresponding to the lines are stored in code buffer 2 and code buffer 3, respectively. After all these transfers are completed, the control unit 1O activates the decoding processing unit 4 and the decoding processing unit 5. The decoding processing unit 4 receives the (n+1)th data from the line memory 8.
> Line pIi image signal and code buffer 2 to (n
+2) Input the code corresponding to the line, decode the (n12)th line, and store the result in the line memory 6. Also? '1: The code processing unit 5 processes the code (from the code bar sofa 3).
rll-3) By sequentially inputting the code corresponding to the line and the image signals of the (r+ + 2)th and in which are being decoded by the decoding processing unit 4, the (n73)th line is decoded and the result is Store as line memory 7/\. After the decoding processing section 1', the control section 10 transfers the image signals of the (n+2)th line and (+1+3)th line stored in the line memory 6 and line' memory 7 to the image memory 9, and at the same time,
The OL detector 1 transfers codes corresponding to the (n+4)th line and the (n+5)th line to the code buffer 2 and the code buffer 3, respectively.

After the transfer is completed, the decoding processing unit 4 uses the code corresponding to the (n+4)th line stored in the code buffer 2 and the image signal of the (n+3)th line stored in the line memory 7 to decode the code corresponding to the (n+3)th line. (n+4> line is decoded and the result is output to the line memory 8. The decoding processing unit 5 also receives the code corresponding to the (n+5)th line from the code buffer 3 and the code decoded by the decoding processing unit 4 from the line memory 8. The image signal of the (n + 4)th line is input sequentially, and the (n - 1-5)th line is decoded.The result is stored in the line memory 6. By repeating this process, parallel decoding processing is performed in units of two lines.

As described in detail, the image decoder according to the present invention includes a code buffer, a line memory with a capacity of h- for one line of an image signal, and a plurality of decoding processing units, and performs parallel decoding processing on a line-by-line basis. This is extremely effective in reducing decoding processing time.

[Brief explanation of the drawing]

FIG. 1 shows a small embodiment of the image decoder according to the present invention, and has two code buffers that store sign marks corresponding to one line of the image signal.
1 is a block diagram of a program in which three line memories each having a capacity for one line of image signals and two decoding processing units are provided.

Claims (2)

[Claims] (1) In a facsimile machine or image storage device that handles image information as an electrical signal quantized into binary levels of 0 and 1, there is an EOL detection unit that detects the end of a code for each line, and A plurality of code buffers that store one line of code to be output, a plurality of decoding processing units that decode the code output from the code buffers, and a plurality of code buffers that can be accessed from each of the decoding processing units. An image decoder comprising: an image signal memory. (2) The image decoder according to claim (1), further characterized in that the decoding processing section decodes codes output from the code buffer and the image signal memory.