JPS60214181A - Coding system - Google Patents

Abstract

PURPOSE:To improve the information compressing rate by reading and transmitting the information only within a range designated by an address of a picture element subject to change. CONSTITUTION:Each picture element information is scanned and compared with the information of a preframe of a frame memory 7, the interframe difference information is quantized, coded and stored once as one-frame information to a buffer 9. On the other hand, a change area detecting section 10 gives an address to a picture element corresponding to the inter-frame difference information subject to change and operated together with a processing control section 11 so as to find out the extreme value of the address. The processing control section 11 transmits an address of the extreme value to a transmission line 3, reads the data in the range to the buffer 9 and transmits it to the transmission line 3. The reception side holds once the address value transmitted at first and store the coded information transmitted next within the range.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a method for compressing and transmitting an image signal with a higher degree of compression.

(2) Conventional technology and problems When transmitting screen information to a remote location, research is being carried out on technology that compresses the amount of data to be transmitted without decomposing it into a large number of pixels and then transmitting the pixel information as is. .

A conventional device is shown in FIG. 1. The input signal to the terminal (1) is obtained by continuously scanning pixel information with a scanning line and converting it into an analog-to-digital signal. The signal is encoded in the encoding device shown as (2) and sent out through the transmission line (3). In the encoding device (2), (4) is a subtracter, (5) is a quantizer, (6) is an adder, (7) is a frame memory, (
8) shows an encoding circuit. The digital signal input to the terminal (1) is subtracted from the output of the frame memo (January 6) (signal of one frame before) in the subtracter (4). Initially, there was no signal stored in the frame memo (January 6), so the subtraction J was not processed, and the input signal ~ reached the next stage as it was.
In the childization device (6), the quantum (1-7, adder (0)
Add this to the output of frame memo January 7). Initially, there was no signal stored in the frame memo (January 2), so the value as it was was displayed as F1.・-King Mume・January 7) 171.・-A large amount is stored.

and the next frame - frame memory and frame memory (
7) to the subtracter (4) for each corresponding pixel -C6λ
The arithmetic processing is performed on the row/)6 difference information by quantizing it in a quantizer (5) and then encoding it in an encoding circuit (8).

The encoded output is transmitted to the L1 terminal via the transmission line (3). Additionally, the signal stored in the frame memo (January 6) is added to the output of the quantization device (5), and the signal to be newly stored in the frame memory (7) is added. Store it in and go. In this way, the difference between the previous signal and the previous signal
1) The amount of transmission is compressed compared to case 1) in which the valley information of the relevant frame is not encoded. However, if you take pictures of objects that don't move much due to the continuous information, it becomes H"3.)
Ruko, if there is a change in only a part and the majority is unchanged, the A effect of compression is 51! ! Not Nagisa.

Transmission path (3) B, transmitted from JL 1'11, l: The information that "the change is qj%" is encoded into 1, C, 12.7, and 2, ""There is a change." Is the information transmitted in small amounts? 5. Since it is information that is not too much and [there is no change - 1] 1 h + 1 is not transmitted, there is no change [fl that says - 1]. 7'+
'15, the total amount of information to be transmitted is
.

This is because it has not decreased. Part 6-) Person-me l'r7
! There was a limit to the J:E ki ratio of tf.

(3) The object of the present invention is to solve the above-mentioned drawbacks by a relatively small number of points 1-.
By adding a simple configuration, we will provide 1ml of the power of 1ml <possible encoding transmission method, 17E, in the evening, 4゜(
4) Configuration of the Invention In order to achieve the above-mentioned L1 objective, the (2) configuration of the present invention is to introduce information into a subtracter and pass the output through an adder.

) Frame (or field) memory 6,2 storage;
The field is Fino [what?], and the output is read out from the frame 1, (or -2 field) in the subtracter and compared with the previous information (.15 and 1-1). The difference is that only 'if' is encoded by the encoding circuit and then transmitted. A) In the encoding redundant transmission i Encoded; It, )
A buffer is provided to store the output of the 1-frame (or twirl) 5'i, and a buffer is provided on the input side of the j-1' bowing circuit. j+): Application of: J1. Open the lid 1.
A1'1 of the pixel where there was a change in the 1'I signal.・Snow 4
) Minimum and maximum 〒1〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒 〒1 blili'! 6 of 6 [) 11th Mehiri, and then transmit it to -4-.]
52.

(5) Embodiment No. 21 of the invention =:l shows the configuration of an embodiment of the present invention in small sections.
Friend 1 and I 1. ．． In the second Chin 1, (9) is ↑, 1
Connected to the output side of the deactivation circuit (8), (tl, encoding circuit (Σ)) 31, S ↑, 1 scrap I -) L
(10) is a change area detection unit, which is connected to the input side of the encoding circuit (8) and detects the difference between frames. This is to detect the minimum and maximum addresses among the addresses of pixels to which information has been applied and the inter-frame difference information has changed. (1
1) indicates a processing control section.

In order to explain the operation of FIG. 2, FIG. 3 shows pixel information of one frame. Each pixel information is scanned from the upper left to the right and compared with the information of the previous frame stored in the frame memory (7) to sequentially obtain interframe difference information at the output of the subtracter (4). This signal is quantized by the quantizer (5) and encoded by the encoding circuit (8), which is similar to the operation of the encoding device (2) in FIG. The output of the encoding circuit (8) is temporarily stored in a buffer (9) as one frame information shown in FIG.

On the other hand, the change area detection section (5) provides an address to the corresponding pixel that has changed as inter-frame difference information, and operates together with the processing control section (11) to find the extreme value of the address. Its operation will be described later. Among the pixel addresses that have changed as indicated by hatching in Figure 3, the pixel addresses closest to the outermost point are P1 (x1, y1) P2 (x2, y2) P3 (x3, y3) Therefore, the extreme value address of the range containing each pixel is P1(x1,
y1) and P4(x2, y3). Processing control unit (11
) obtains this extreme value address, sends the address value to the transmission line (3), then reads data within the range indicated by the address value to the buffer (9), and sends it to the transmission line (
3). Therefore, the receiving side (not shown) is equipped with a memory capable of storing the contents of one frame, temporarily holds the initially transmitted address value, and stores the next transmitted encoded information within that range.

Next, the changed area detection section (10) shown in FIG. 3 will be explained. The detection unit (10) includes a pixel number counter, a counter value comparator, and the like. The numbers in the 50s indicate circuit configurations for determining the X coordinate of point P1 in FIG. (51) is a clock pulse counter, (52) is a comparator, (53)
(54) is a counter value holder, (56) is an application terminal for black and black pulses generated in correspondence with pixel scanning, (57)
) indicates the output signal application terminal of the subtracter (14) in FIG. 2, and (58) indicates the overall operation control device. Furthermore, the numbers in the 60s, 70s, and 80s correspond to the numbers in the 50s.

Before applying the input signal to the terminal (57), the control device (58) sets the pixel value forming one scanning line, for example, 95, in the counter value holder (53), and resets the counters (51) and (54). I'll keep it. Signal converter (21) in Figure 2
Connect the clock pulse to the terminal (56) to synchronize with the operation of the
In the case of FIG. 3, the signal at the terminal ('57) is, for example, "L" with no change compared to the value of the previous frame. At this time, the counter (51)
counts clock pulses (56) and counts 95 when it has scanned l scan lines. At that time, the comparator (52) compares the values of the counter (51) and the counter value holder (53), and in this case, determines that they are the same value, and (51)
).

The smaller value of (53) is set to (53) and (54). In this case, there is no change in the value of (53). The control device (58) also resets the counter (51).

The same operation is performed for the next scanning line, and the counter (51) restarts counting. When a change signal is applied to the terminal (57) in some scanning lines, the counter (51) stops operating. When the scanning of the scanning line is completed, the comparator (52) detects that the value of the counter (51) is (5).
3) It is determined that the value is smaller than the value of the counter (51), and the values of (53) and (54) are reset to the value of the counter (51).

Since the same operation is performed for the next scanning line, when a change in the pixels in the scanning line is detected earlier than before, the value of the counter (54) is reset to a smaller value again.

Therefore, when one frame of scanning is completed, the set value of the counter (54) is the leftmost value of the pixel that has emitted a change signal to the pixel, that is, the X coordinate (x+
) is set.

Next, each device numbered in the 60s determines the Y coordinate of Pl in FIG. The total number of scanning lines in one frame, for example 124, is initially set in the counter value holder (63). The counter (61) stops operating in response to a signal indicating a change in frame human pixels, and the comparator (61) stops operating.
62), and if the value is smaller than 124, resetting is the same as determining the X coordinate. At this time, the value (y]) closest to the top is obtained as the Y coordinate of Pl.

Furthermore, each device with a code in the 70s is marked with X on P4 in Figure 3.
The coordinates are determined, and the counter value holder (73) is set to, for example, 95, and when the comparator (75) makes a determination regarding a pixel change signal, the larger value is reset. At this time, the value closest to the right as the X coordinate of P4 (x
2) has been obtained.

In addition, each device with a code in the 80s is Y on P4 in Figure 3.
The coordinates are determined, and the counter value holder (83) is set to, for example, 124, and when the comparator (85) makes a determination regarding a pixel change signal, the larger value is set and corrected. At this time, the lowest value (ya) is obtained as the Y coordinate of P4.

With the above steps, the coordinates of PL and P4 are obtained.

Although the present invention has been described using an inter-frame differential encoding method as an example, it is also possible to apply the present invention to an inter-field differential encoding method.

(6) Effects of the Invention According to the present invention, the area outside the frame of pixel change negative information is constant value information, so that range is transmitted, and then the change (j negative information) is transmitted. Since the information corresponding to all pixels is not transmitted through the transmission line,
The information compression rate can be if++<.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional compression encoding device, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a diagram for explaining the operation of Fig. 2, and Fig. 4 is a block diagram of an embodiment of the present invention. 2 is a diagram showing the configuration of a change Nl region detection section in FIG. 2. FIG. (1) - Human signal terminal (2) - Encoding device (3) - Transmission line (41 - Subtractor (5) - Quantization device (6) - Adder (7) - Frame I/- Frame memory (8) - Encoding circuit (91--Buffer memory (lω-change area detection unit) Patent applicant: Tomitotsu Co., Ltd. Agent Patent attorney: Eisuke Suzuki Figures 1, 2 P (x3, y3) Figure 4

Claims (1)

[Claims] The information is introduced into a subtracter, its output is stored in a frame (or field) memory via an adder, and the frame (
In the encoding transmission method, the output read from the memory (or field) is compared in the subtracter with information one frame (or field) before, and only the difference information is encoded and transmitted by the encoding circuit. The output side is equipped with a buffer for storing one frame (or field) of output encoded by the encoding circuit, and the input terminal of the encoding circuit is equipped with a change area detection section to which the difference information is applied. , the change area detection unit detects the minimum and maximum addresses among the addresses of pixels whose inter-frame (or field) difference 1n information has changed, and reads only information within the range specified by the addresses from the memory. A coded transmission method characterized by transmitting data using 9.