JPS63267063A - Picture encoding and decoding device - Google Patents

Abstract

PURPOSE:To efficiently use a picture encoding and decoding means by managing the residual quantity of memories and switching a coding processing and a decoding processing on occassion based on the managing result. CONSTITUTION:A control part 9 manages data quantity accumulated in a picture signal input memory 3 and a code output memory 6 in a coding action. If there is data in a code input memory 8 when a picture signal input speed is small and the data residual quantity of the picture signal input memory 3 becomes less than a prescribed value, and when code output speed is small and the data residual quantity of the code output memory becomes more than the prescribed value the control part 9 makes a deciding request to a picture encoding and decoding device 5. Consequently, the decoder starts a decoding action and a picture signal is outputted to a picture signal output part 2. If the residual quantity of the picture signal input memory 3 becomes more than the prescribed value and that of the code output memory 6 becomes less than the prescribed value when coding is executed in such a state, the control part 9 instructs the picture encoding and decoding device 5 to resume the coding action. Thus, the decoding processing can simultaneously be executed in the coding processing of one page. Thus, the picture encoding and decoding device 5 can efficiently by operated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention handles an image signal as an electrical signal quantized into binary levels of "0" and "1", and mutually converts the image signal and code information. The present invention relates to an image code decoding device.

〔overview〕

The present invention provides an image code/decoding device that encodes or decodes image signals or code information temporarily stored in a memory, alternately converts them into corresponding code information and image signals, and temporarily stores the same in the memory. By managing the remaining amount of data and switching between encoding processing and decoding processing at any time based on the management results, the image encoding/decoding means can be used efficiently.

[Conventional technology]

Conventionally, this type of image encoding/decoding apparatus encodes an image signal and decodes encoded information into an image signal in one direction, either encoding or decoding, on a page-by-page basis.

[Problem that the invention seeks to solve]

In such conventional image encoding/decoding devices, encoding of image signals and decoding of encoded information are performed unidirectionally in units of one page. Even if a code that can be a target exists, the decoding process is forced to wait. On the other hand, when decoding one page, the encoding process of the image signal is forced to wait.

Therefore, in a device where the speed of image signal input/output or code input/output is smaller than the encoding/decoding processing capacity, either encoding or decoding is performed even though the encoding/decoding processing section is in an inactive state. The disadvantage is that when one process is running, the other process must wait.

The present invention aims to eliminate such drawbacks and to provide an image code decoding device that can efficiently utilize an image code decoder.

[Means for solving problems]

The present invention includes a first memory for temporarily storing incoming image information, a second memory for temporarily storing incoming code information, encoding conversion of the image signal temporarily stored in the first memory into code information, and An image code decoding means for alternately decoding and converting the code information temporarily stored in the second memory into an image signal, and a third memory for temporarily storing the code information encoded and converted by the image code decoding means. and a fourth memory for temporarily accumulating the image signal decoded and converted by the image code decoding means, while the image code decoding means executes the encoding conversion. Compare the size of the unstored memory area in each of the memory and the third memory, and switch the encoding conversion being executed to the decoding conversion based on the comparison result, while the image code decoding means performs the decoding conversion. During execution, compare the size of the unstored memory area in each of the second memory and the fourth memory,
The present invention is characterized by comprising a control means for switching the decoding conversion being executed to the encoding conversion based on the comparison result.

[For production]

When the information processing capacity of the image code decoding means is determined by the amount of input information, the value of the ratio between the remaining memory capacity of the first memory and the remaining memory capacity of the third memory becomes small. When the value of this ratio reaches a predetermined value, the operation is switched from encoding conversion to decoding conversion.

During this time, the remaining memory capacity of the first memory decreases. on the other hand,
A similar phenomenon occurs between the second memory and the fourth memory during decoding and conversion. In this way, the encoding process and the decoding process are repeated alternately, and the idle period of the image encoding/decoding means is shortened, thereby achieving efficient operation.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The figure is a block configuration diagram showing the configuration of the present invention. The 0 image symbol input unit 1 is, for example, an image reading device, and "0" and "
The 0 image quality code decoder 5 sends the binarized image signal into ``1'' to the image signal input memory 3. Send to 6. The code stored in the code output memory 6 is received by the code input/output section 7. On the other hand, the code input/output unit 7 sends the code to the code input unit 8, and the image code decoder 5 receives the code from the code input unit 8, decodes it, stores the image signal in the image signal output memory 4, and stores the image signal in the image signal output memory 4. The image signal is output to an image signal output section 2. The image code decoder 5 can switch between encoding and decoding at any time.

Next, the operation of this embodiment will be explained with reference to the drawings. First, during the encoding operation, the control section 9 manages the amount of data stored in the image signal input memory 3 and the code output memory 6, and when the image signal input speed is low, the remaining amount of data in the image signal input memory 3 is low. When the code output speed is low and the remaining amount of the code output memory 6 exceeds a certain value, if there is data in the code input memory 8, the image code decoder 5
Issue a decryption request to. As a result, the device enters a decoding operation, and an image signal is output to the image signal output section 2.

During decoding in this state, if the remaining capacity of the image signal input memory 3 exceeds a certain value and the remaining capacity of the code output memory 6 becomes below a certain value, the control unit 9 causes the image code decoder 5 to re-encode the code. Instructs to restart the conversion operation. In this way, the decoding process is simultaneously executed during the encoding process of one page.

Next, during the decoding operation, the control unit 9 manages the remaining capacity of the code input memory 8 and the image signal output memory 4, and if the code input speed is low and the remaining capacity of the code input memory 8 is below a certain value, Further, when the image signal output speed is low and the remaining capacity of the image signal output memory 4 exceeds a certain value, the control section 9 requests the image code decoder 5 to perform encoding. During encoding in this state, if the remaining capacity of the code input memory 8 exceeds a certain value and the remaining capacity of the image signal output memory becomes below a certain value, the control unit 9 causes the image code decoder 5 to perform decoding processing. order to restart.

In this manner, the present apparatus can perform decoding in parallel when encoding one page of images, and can receive image signal input and encode when decoding one page.

〔Effect of the invention〕

As explained above, the present invention is capable of inputting an image signal during decoding processing of encoded information for one page and simultaneously performing encoding operation, and for inputting and encoding image signal input for one page. Since a code can be input and decoded to output an image signal, there is an effect that the image code decoder can be operated efficiently.

[Brief explanation of the drawing]

The figure is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. 1... Image signal input section, 2... Image signal output section, 3...
・Picture signal input memory, 4...Picture signal output memory, 5.
...Image code decoder, 6... Code output memory, 7...
- Code input/output unit, 8... Code input memory, 9... Control unit.

Claims (1)

[Claims] (1) First memory for temporarily storing incoming image information (3)
and a second memory (8) for temporarily storing incoming code information; encoding conversion of the image signal temporarily stored in the first memory into code information and code information temporarily stored in the second memory; an image code decoding means (5) that alternately performs decoding conversion into an image signal; a third memory (6) that temporarily stores code information encoded and converted by the image code decoding means; and the image code decoding means. In an image signal encoding/decoding device comprising a fourth memory (4) for temporarily storing image signals decoded and converted by means, the size of the unstored memory area is determined in each of the first memory and the third memory. The encoding conversion being executed is switched to the decoding conversion based on the comparison result, and while the decoding conversion is being executed by the image code decoding means, unused information is stored in each of the second memory and the fourth memory. An image encoding/decoding device comprising: a control means (9) for comparing the sizes of storage memory areas and switching the decoding conversion being executed to the encoding conversion based on the comparison result.