JPS6058772A - Picture information recorder - Google Patents

Abstract

PURPOSE:To make an efficient recoring error processing possible by reproducing picture information immediately after recording to discriminate whether an error occurs or not and discriminating whether recording errors occur across plural scanning lines or not and outputting only errors, which occur across plural scanning lines, as recording errors. CONSTITUTION:When an EOL mark detecting circuit 10 takes out picture information from a buffer circuit 3 to detect an EOL mark, the circuit 10 outputs an EOL mark detection signal 1' to an error discriminating circuit 8 through a delay circuit 13. An error detecting circuit 7 checks whether an error occurs in reproduced picture information or not; and if it occurs, the circuit 7 outputs an error detection signal 2' to the error discriminating circuit 8. It is discriminated whether the error occurs across the EOL mark or occurs in one compression picture information unit 2 by the error discriminating circuit 8 on a basis of inputted EOL mark detection signal 1' and error detection signal 2'; and only when the error occurs across the EOL mark, this error is outputted as a recording error to an error display circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field of the invention The present invention provides a method for recording an input image by adding a mark indicating the end of the line to each scanned line and checking whether there are any recording errors after recording nine image information. Regarding an image information recording device that has a function that allows immediate playback.

In particular, the present invention relates to error processing that occurs when recording the image information.

(b) Technical Background In the recent information society, it is an important technical issue to record vast amounts of information such as images at low cost and to easily input and output them.

Normally, the storage capacity to record the code information on one A4 sheet is a few bytes, but the storage capacity to record the image information on 441 sheets requires a storage capacity of hundreds of bytes or more. Even when compressing and recording image information, a storage capacity of several tens of bytes is required. As a medium for recording such a huge amount of information at a low cost, an optical disk is most suitable because it uses a laser beam to record several gigabytes per disk on a disk-shaped medium.

However, optical disk media also have various defects.

One of the drawbacks is that the error rate is high.

There is a need for the development of various practical techniques for image information recording devices that overcome these drawbacks and fully utilize the advantages.

(C) Prior Art and Problems A conventional image information recording apparatus will be explained by taking as an example an image information recording apparatus using an optical disk medium.

Figure 1 shows an example of the information structure when recording image information.

(A) is an example of compression of raw image information of one scanning line, (B)
shows examples of error occurrence when recording image information.

In the figure, 1 indicates a raw image information unit, and 2 indicates a compressed image information unit.

Note that a indicates an example of an error occurring only within one compressed image information unit 2, and b indicates an example of an error occurring across two compressed image information units 2. The raw image information unit 1 is a unit of image information obtained by scanning input image information. The compressed image information unit 2 is information obtained by compressing the raw image information unit 1 to about 1/10, and a mark (end of line (EO[, > mark)) indicating one scanning line unit is attached at the end of the information.

Conventionally, image information is recorded by recording raw image information obtained in one scanning line into 2 compressed image information units, which are compressed to about 1/10 of the raw image information (UNISO) 1, or by recording compressed image information units 2 to a specified length. A method of recording multiple items is adopted. The error rate that occurs during the recording/reproduction of image information is such that it can be used as information without requiring the same high quality as when recording/reproducing code information; When demanding high quality on time.

There is a risk that frequent retries upon error detection may result in a decrease in the actual recording capacity or a decrease in processing speed.

However, if the error is contained within one compressed image information unit 2, such as a in FIG.
), there is a problem in that if an error occurs that spans a plurality of compressed image information units 2 in succession, the image information cannot be reproduced.

(d) Purpose of the Invention The object of the present invention is to provide a new image information recording device that eliminates the above-mentioned drawbacks. If this occurs consecutively, it will be treated as a recording error and 1
The object of the present invention is to realize an image information recording apparatus capable of efficiently handling errors during recording without treating errors within a scanning line as errors during recording.

(e) Structure of the Invention The present invention provides a method in which a mark indicating the end of one scanning line is attached to each scanning line of an input image so that the recorded image information can be reproduced immediately after recording in order to check whether there is a recording error. - An image information recording device having a door after write function, wherein when recording the input image, the image information is immediately reproduced after recording to determine the presence or absence of an error; The present invention is characterized by providing means for determining whether or not the image information straddles the scanning lines, and means for outputting only errors that span multiple scanning lines as errors during recording of the image information, thereby enabling efficient recording error processing. This can be achieved by an image information recording device.

(f) Examples of the invention The present invention will be explained below with reference to the drawings.

FIG. 2 shows an embodiment of the image information recording apparatus according to the present invention, which uses an optical disk, in which (A) shows a circuit diagram and (B) shows an operation diagram.

In the figure, 3 is a buffer circuit, and 4 is a modulation circuit.

5 is an optical disk recording medium, 6 is a reproduction circuit, 7 is an error detection circuit, 8 is an error judgment circuit, 9 is an error display circuit, 1
0 represents an end-of-line mark detection circuit (hereinafter abbreviated as EOL mark detection circuit), 11 represents a flip-flop circuit, 12 represents a counting circuit, and 13 represents a delay circuit.

Note that ■ to ■ are signals at each point in time in FIG. 2, and ■ is an EOL mark detection signal after passing through the delay circuit 13.

■ indicates an error detection signal, and ■ indicates an error display signal, respectively. Further, this embodiment will be described in the case where the image information is provided with a door-after-write function for immediately reproducing the image information in order to verify the presence or absence of errors during recording after recording.

This embodiment is a buffer circuit 3 which stores image information obtained by scanning an input image (not shown).
a modulation circuit 4 that modulates recorded data so that the image information extracted from the optical disc recording medium 5 can be easily recorded/reproduced;
．． an optical disc recording medium 5 for optically recording the image information from the modulation circuit 4; and a reproducing circuit 6 for reproducing the image information read from the optical disc recording medium 5 into digital signals so that they can be easily processed in subsequent circuits. An error detection circuit 7 that detects an information error from the output of the reproduction circuit 6 and outputs an error detection signal ■ to the error determination circuit 9. By inputting the IEOL mark detection signal detection signal - detection signal ■.

Error determination circuit 8, which determines whether the detected error occurs across the EOL mark. An error display circuit 9 that displays the output from the error determination circuit 9 as a signal as error information. EOI and mark detection circuit IQ that detect the EOL mark from the image information taken out from the buffer circuit 3
, EOI, a flip-flop circuit 11 that receives input signals from the mark detection circuit 10 and outputs the temporal length of the EOI and mark according to the input signal from the counting circuit 12.
A counting circuit 12 that counts the length of the EOL mark based on the input signal from the OL mark detection circuit 10 and outputs the counting result to the flip-flop circuit 11. The difference between the recording timing and the reproduction timing (a value determined by the EOL mark detection time, the delay until the reproduction signal is detected after recording, and the modulation/demodulation circuit delay; if the former is longer, it is a negative delay, i.e. The error detecting circuit 13 includes a delay circuit 13 which adjusts the output of the error detecting circuit 7 (a delay is added to the output of the error detecting circuit 7) and outputs it as an EOL mark detection signal (2).

The operation of this embodiment will be explained based on FIG.

A compressed image information unit 2 obtained by scanning an input image and compressing it for each scanning line is output to a buffer circuit 3, and the buffer circuit 3 stores this image information.

When the EOL mark detection circuit 10 extracts image information from the buffer circuit 3 and detects the EOL mark, it outputs the image information from the buffer circuit 3 to the counting circuit 12.
The timing of the EOL mark length is determined based on the signal from the EOL mark detection signal 1, and the EOL mark detection signal (2) is outputted to the error determination circuit 8 through the delay circuit 13.

On the other hand, the modulation circuit 5 also has buffer times V! The image information is taken out from r3 and modulated by the optical disc recording medium 5, and the image information is recorded on the optical disc recording medium 5. In order to check whether there are any errors or mistakes in the recorded image information, the reflected light is detected using a light beam during playback (the light beam during recording may also be used), and the reflected light is reproduced by a playback circuit 6 to detect an error. Output to 7. The error detection circuit 7 checks the presence or absence of an error from the reproduced image information, and if there is an error, sends an error detection signal■
is output to the error determination circuit 8.

The error determination circuit 8 determines whether an error occurs across EOL marks or within one compressed image information unit 2 based on the input EOL mark detection signal and the error detection signal ■. If an error occurs in one compressed image information unit 2, it is not displayed as an error, but only if the error occurs across the EOL mark, it is output to the error display circuit 9 as a recording error. The error display circuit 9 transfers this error information to a higher-level control section (not shown).

(g) Effects of the Invention According to the present invention, if an error that occurs when recording one image information continues across multiple EOL marks, it is treated as an error during recording, and an error within one EOL mark is treated as an error during recording. No error occurred during recording.

This has the effect of providing an image information recording device that performs efficient error processing.

[Brief explanation of the drawing]

FIG. 1 shows an example of an information structure when recording image information, and FIG. 2 shows an embodiment of the image information recording apparatus according to the present invention, which uses an optical disk. In the figure, 1 is a raw information unit, 2 is a compressed information unit, 3 is a buffer circuit, and 4 is a modulation circuit. 5 is an optical disk recording medium, 6 is a reproduction circuit, 7 is an error detection circuit, 8 is an error judgment circuit, 9 is an error display circuit, 1
0 represents an EOL mark detection circuit, 11 represents a flip-flop circuit, 12 represents a counting circuit, and 13 represents a delay circuit. 0

Claims (1)

[Claims] A mark indicating the end of one scanning line is attached to each scanned line of the input image, and the recorded image information can be played back immediately after recording in order to check whether there is a recording error. Image information recording with a door after write function. The apparatus includes means for determining the presence or absence of an error by reproducing the image information immediately after recording when recording the input image, and determining whether or not the occurrence of an error during recording spans a plurality of the scanning lines. 1. An image information recording apparatus characterized by comprising means for outputting only errors spanning a plurality of scanning lines as errors during recording of the image information.