JPH04129487A - Picture reproducing device - Google Patents

Abstract

PURPOSE:To easily and quickly observe a screen by selecting plural video RAMs storing the data of a frame closest to a desired frame and reproducing the frame when a frame of a slightly preceding time with respect to the designated frame is reproduced. CONSTITUTION:The output of a picture data storage means 33 and an output of a stored picture data storage means 36 are selected in response to the output of a stored picture data read write control means 27 and a display output signal is outputted externally. Then every time a designated number comes after the reproduction of a refresh data frame while a data frame is being reproduced, a picture data of a frame completed at that time is stored in other plural video RAMs, and when the frame of a slightly preceding time is reproduced, the data of a frame closest to the frame is reproduced from the stored video RAM. Thus, even when the reproduction from a medium in which interval of refresh data frames is long, a preceding frame at the current reproduction point of time is easily reproduced with a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image reproducing apparatus that reads, decompresses and displays image data from a medium on which image data is compressed and recorded.

Conventional technology FIG. 3 is a block diagram showing the configuration of this conventional image reproducing device, in which 1 is a storage medium section that records data, 2 is a compressed data reading section that reads compressed image data, and 3 is a section that analyzes control information. 20 is refresh data, 21 is differential data, 4 is a refresh data processing section that decompresses refresh data 20, and 5 is differential data 21 and the previous frame. A differential data processing unit performs decompression processing using data from the block reading unit 7. 6 is a current frame block writing unit that controls writing of data of all blocks in the current frame to the video RAM 8. 7 is a block from the previous frame from the video RAM 8. 8 is a video RAM unit that stores image data; 9 is a video RAM
This is a display unit that displays the output from 8.

FIG. 4 is a data array diagram showing the configuration of one frame of the screen. Here, the number of pixels in the horizontal direction of one frame is m (integer) pixels, and the number of pixels in the vertical direction is n (
(integer) pixels. Therefore, one screen is m x n
expressed in pixels.

If this is divided into blocks of p (integer) pixels in the horizontal direction and q (integer) pixels in the vertical direction, the screen will have (m/p) blocks in the horizontal direction and (n/p) in the vertical direction. It is also expressed as the number of blocks. Normally, this block is often processed with p=q=8.

FIG. 5 shows a data array diagram in which one piece of screen data is serially arranged in the order in which it is recorded on a medium. horizontal direction (m/
p)×(n/Q) pieces of block data in the vertical direction are arranged in order from the upper left to the lower right of the screen. The first data in this figure is at the top left, and the last data is at the bottom right.

Generally, the closer the image data is to a moving image, the more likely the current frame data will be the same screen data as the previous frame screen data. This can be said to indicate a high correlation between frames, and when recording data on a medium with as little data as possible, it is efficient to record differential data between the data of the previous frame and the previous frame. However, when the scene is different, this difference data is not small, so the data of the current frame is recorded as is. This data is usually called refresh data in contrast to differential data.

FIG. 6 is a data array diagram in which these frame data are serially arranged in the order in which they are recorded on the medium. A difference data frame is sandwiched and recorded between refresh data frames. Also, at the beginning of each frame data, the fifth
Control information shown at the top of the figure is added. This control information records a flag that identifies whether this frame data is a refresh data frame or a differential data frame.

FIG. 7 shows an example of data of an arbitrary block of an arbitrary frame, and is a case where p=q=8. FIG. 7(a) shows the image data value of one block of certain refresh data. FIG. 7(b) shows the image data value of the block at the same position as FIG. 7(a) in the next frame. FIG. 7(C) shows the difference between FIGS. 7(a) and 7(b). A value of 1 indicates an increase of 1 from the previous refresh data frame value, and a value of -1 indicates a decrease of 1 from the previous refresh data frame value. If there are many numbers that are the same as -1, 0, and 1, as in this data example, the run-length method, Hadamard transformation, or two-dimensional D
It is easy to compress the amount of data using mathematical compression techniques such as CT.

When reproducing from a medium in which frame data is recorded with differential data sandwiched between refresh data as shown in FIG. 6, the reverse operation is performed. First, prepare a video RAM for display and a video RAM for work.

The data read from the medium is used as a video RA for work.
Written to M. That is, a refresh data frame is written to the video RAM for each block read from the medium at that position block for work. If a run-length method or a mathematical compression technique such as Hadamard transform or two-dimensional DCT is used, the differential data frame is first demodulated and then extracted from the previous frame in the display RAM at the same position. The block data is acquired, the difference data is added to the value, and the result is written into the video RAM for the work of that positron. When all the work data has been processed, the current work video RAM is switched to the display video RAM, and the current display video RAM is switched to the work video RAM.

A conventional reproduction example will be explained with reference to FIG. A compressed data reading section 2 reads data from the storage medium section 1. As shown in FIG. 6, these data consist of a refresh data frame followed by a differential data frame. As shown in FIG. 5, control information for the frame data is recorded at the beginning of each frame data. This control information is determined by the control information analysis section 3, and the data is separated and output to each data processing section. In the refresh data processing section 4, pixel data of all blocks of the refresh data 20 are written into the video RAM 8 by the current frame block writing section 6 as shown in FIG. On the other hand, the difference data 21 is generated by reading the pixel data of each block of the previous frame from the video RAM 8 by the previous frame block reading unit 7, and adding the read value and the difference data to the difference data processing unit 5. Write to the current frame block in video RAM 8. The outputs of these video RAMs 8 are displayed on a display section 9. in this way,
The same operation was repeatedly performed on the sequential difference data to display and reproduce each frame data.

Problems to be Solved by the Invention However, in the conventional configuration as described above, when playing back a differential frame between refresh data frames, in order to play back a slightly previous frame, the refresh data frame must be updated each time. The problem is that the frames must be completed in order from reproduction.

In view of the above, the present invention is designed to reproduce the image data of the frame completed at that time by reproducing the image data of the frame completed at that time, while reproducing each differential data frame, every time a specified number of frames are reached after the refresh data frame is reproduced. To provide an image reproducing device which stores data in a RAM and, when reproducing a slightly previous frame, reproduces data of a frame closest to the frame from a plurality of video RAMs stored in the stored video RAM.

Means for Solving the Problems In order to achieve the above object, the image reproducing apparatus of the present invention includes compressed data reading means for reading compressed data from a medium on which image signals are compressed and recorded, and control information is analyzed from the output of the data reading means. control information/image data separation means for separating and outputting the control information and image data; and image data processing means for processing image expansion of the image data output of the control information/image data separation means in accordance with the control information. , an image data storage means for storing the output of the image data processing means, a storage signal generation means for generating an image data storage signal from the control information of the control information/image data separation means, and a storage signal generation means for generating an image data storage signal from the storage signal generation means. storage image data storage means for capturing and storing image data from the image data storage means based on the output; and storage for receiving read signals from the outside and controlling reading and writing of the storage signal generation means and the storage image data storage means. an image data reading control means; and a display means for outputting a display output signal to the outside by switching between the output of the image data storage means and the output of the stored image data storage means according to the output of the stored image data reading control means; It is equipped with the following.

According to the above-described configuration, the present invention reproduces each differential data frame, and every time a specified number of frames are reached after the refresh data frame is reproduced, the image data of the frame completed at that time is transferred to another frame. Multiple videos of R
The data is stored in the AM, and when a slightly previous frame is to be played back, the data of the frame closest to that frame is played back from the stored video RAMs.

Therefore, even when playing back from a medium with a long interval between refresh data frames, the frame before the current playback time can be easily played back in a short time.

Embodiment FIG. 1 is a block diagram showing the configuration of an image reproducing apparatus in an embodiment of the present invention.

In FIG. 1, 30 is a data reading means, 31 is a control information/image data separation means, 32 is an image data processing means,
33 is an image data storage means, 34 is a display means, 35 is an image data storage signal generation means, 36 is a storage image data storage means, 37 is a storage image data read/write control means, and 38 is a read instruction signal. The general operation of the image reproducing apparatus of this embodiment configured as described above will be explained below.

Data is read by the data reading means 30 from a medium on which image data is recorded in the format shown in FIG. Since control information is recorded at the beginning of each frame as shown in FIG. 5, the control information/image data separation means 31 separates the data and control information from the image data processing means 32 and the storage signal generation means 35. Each is separated and output. The data is processed by the image data processing means 32 based on the control information.
is demodulated and stored in the image data storage means 33. On the other hand, when the storage signal generation means 35 receives information that is refresh data from the control information, it activates an internal counter and stores it in the image data storage means 33. Information that is difference data is counted, and previous screen data is obtained from the image data storage means 33 for each specified value and stored in the save image data storage means 36.

These stored images are selected under the control of the stored image data reading control means 37 according to the contents of the reading instruction signal 38, and the outputs of the image data storage means 33 and the stored image data storage means 36 are displayed on the display means 34. Output and display the image.

FIG. 2 is a block diagram showing the detailed configuration of FIG. 1. 1 is a storage medium section, 2 is a compressed data reading section, 3 is a control information analysis section, 4 is a refresh data processing section, 5 is a differential data processing section, 6 is a current frame block writing section, 7 is a previous frame block reading section , 8 is a video RAM, 9 is a display section, 10 is a display selection section, 11 is a frame number initial setting section, 12 is a frame number counting section, 13 is a frame number checking section, 14 is a page data control section, 15 is a previous frame All block reading section, 16 is page data writing section, 17
is a video RAM, 18 is a page data reading section, 20 is refresh data, 21 is differential data, 22 is a refresh data flag, 23 is a differential data flag, 24 is an initial setting flag, 25 is a previous frame capture flag, 26 is a write page 27 is a read page number, and 28 is a page read instruction signal.

The data reading means 30 in FIG. 1 is the compressed data reading section 2 in FIG. 2, the control information/image data separation means 31 in FIG. 1 is the control information analysis section 3 in FIG. The image data processing means 32 corresponds to the refresh data processing section 4, the differential data processing section 5, the current frame block writing section 6, and the previous frame block reading section 7 in FIG. 2, the display means 34 of FIG. 1 corresponds to the display section 9 and display select section 10 of FIG. 2, and the storage signal generation means 35 of FIG. 1 corresponds to the frame number initial setting section 11 of FIG. , the frame number counting section 12 and the frame number checking section 13.
The storage image data storage means 36 shown in the figure is the video RA shown in FIG.
M17, stored image data reading control means 3 in FIG.
Reference numeral 7 corresponds to the page data control unit 14, previous frame all block reading unit 15, page data writing unit 16, and page data reading unit 18 in FIG. 2, and the read instruction signal 38 in FIG.
is the page read instruction signal 28 in FIG.

First, data is read by the compressed data reading section 2 from the storage medium section 1 shown in FIG. The data is a series of differential data frames sandwiched between refresh data frames as shown in FIG.

As shown in FIG. 5, frame control information indicating whether the frame is a refresh data frame or a differential data frame is recorded at the beginning of each frame data. This control information is determined by the control information analysis unit 3, and a refresh data flag 22 and a difference data flag 23 are output. On the other hand, the data contents are separated and output as refresh data 20 and difference data 21 based on the control information.

The refresh data 20 is generated by the refresh data processing section 4, in which the pixel data shown in FIG. will be written to. The video RAM 8 is divided into a previous frame section for display and a current frame section for work. When the data processing of the work part is completed, the display and display are alternately switched to display and work.

Moreover, since the difference data 21 is the difference data of the pixel shown in FIG. 7(C), in order to demodulate the pixel data shown in FIG. 7(b), The data in C) may be added to each pixel. Here, the seventh
The data in Figure (C) is the difference data 21, and the data in Figure 7 (
The data a) is obtained from the display section of the video RAM 8 via the previous frame all block reading section 15, and is added to the differential data processing section 5 to calculate the pixel data shown in FIG. 7(b). The data is written to the work section of the video RAM 8. Image data for display in the video RAM 8 is displayed and output by the display section 9 via the display select section 10.

When the refresh data flag 22 is set in the frame number initial setting section 11 from the control information analysis section 3 in response to the reproduction of those image data, the internal frame number counter of the frame number counting section 12 is set to the specified value. “f
Initialize to I+. The specified value of "f" can be set arbitrarily. This operation also works in the same way with the initial setting flag 24. When the difference data flag 23 from the control information analysis section 3 is set in the frame number counting section 12, the frame number checking section 13 first determines whether the current internal counter value is 0''. If it is not "0", the counter of the frame number counter section 12 is decremented by "1".

If the first count value is ++f′, “′f−1”
'. On the other hand, if it is "0", the complaint number check section 13 outputs the previous frame capture flag 25 to the page data control section 14 and the initial setting flag 24 to the frame number initial setting section 11, respectively.

Previous frame capture flag 25 in page data control unit 14
When is set, here, it is controlled where in the frame screen storage section consisting of a plurality of frames in the video RAM 17 is stored. These multiple frame screen storage units are expressed in units called pages. That is, this video RAM 17 is composed of a plurality of pages. If no pages are initially used, 1. 2. 3. ...is used. Write page number 2 in page data writing section 16
6 is set, the display data in the video RAM 8 is read by the previous frame all block reading section 15 and written into the video RAM 17 of a designated page, thereby performing a so-called copy operation. These operations are again continued in the same manner. If the value of °'f''' is "3", the demodulated screen at that time will be saved in the order of 3°6.9... of the difference data in Figure 6. .

Next, while reproducing the 11 points of the difference data in FIG. Therefore, the reading page number 27 is set to read the 9”° page.

The vane data reading section 18 selects the designated page "9" of the video RAM 17 based on the read page number 27, and outputs the screen data to the display selection section 1o. In the display selection unit 10, the page reading instruction signal 2
8, the output screen of the video RAM 17 is switched instead of the output screen of the video RAM 8, and is displayed via the display unit 9.

As described above, according to this embodiment, when a certain difference data point between refresh data is being played back, and in order to play back the screen of the previous difference data point, an image from the video RAM stored in a certain unit is used. I'm trying to switch and play. As a result, the reproduced screen can be viewed in a much shorter time than when the screen at the target point is reproduced by sequentially demodulating the difference data frame from the previous Fresne data frame.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when a differential frame between refresh data frames is being played back, in order to play back a slightly earlier frame, each time a frame slightly before that frame is to be played back, it is necessary to start from the playback of the refresh data frame each time. As opposed to having to complete frames in sequence, each differential data frame is played, and each frame that is completed at the specified number of frames after the refresh data frame is played. image data is stored in a plurality of other video RAMs.

Then, when reproducing a frame a little before that frame, the data of the frame closest to that frame is selected from the multiple stored video RAMs and reproduced.
It allows you to see the screen much faster, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an image reproducing device in an embodiment of the present invention, FIG. 2 is a block diagram showing the detailed configuration of FIG. 1, and FIG. 3 is a block diagram showing the configuration of a conventional image display device. Figure 4 is a data array diagram showing the configuration of one frame of the screen, Figure 5 is a data array diagram showing the configuration in which one screen data is serially arranged in the order in which it is recorded on the medium, and Figure 6 is a data array diagram showing the configuration of one frame of the screen. 7 is a data array diagram showing a serial arrangement of frame data in the order in which they are recorded on a medium, and FIG. 7 is a data array diagram showing an example of data of an arbitrary block of an arbitrary frame. 1... Storage medium section, 2... Compressed data reading section,
3... Control information analysis section, 4... Refrain data processing section, 5... Differential data processing section, 6.
...Current frame block writing unit, 7...Previous frame proy') reading unit, 8.17...Video RAM
1 9...display section, 10...display selection section,
11... Frame number initial setting section, 12...
Frame number counting section, 13... Frame number checking section, 14... Page data control section, 15...
・Previous frame all block reading unit, 18... page data writing unit, 18 page data reading unit, 3
o...Data reading means, 31...Control information/image data separation means, 32...Image data processing means,
33... Image data storage means, 34... Display means, 35... Save signal generation means, 36... Saved image data storage means, 37... Saved image data reading control means, 38... Reading instruction signal. Agent's name Patent attorney Akira Okaji 2 persons 3B-Ichisei Cup 1st Priest No. W Lifshi Noshchi 9 Display mortar 1st map (C) Ramie #I! i way

Claims (1)

[Scope of Claims] Compressed data reading means for reading compressed data from a medium on which an image signal is compressed and recorded, control information obtained by analyzing control information from the output of the data reading means, and control information/image for separately outputting image data. data separation means; image data processing means for decompressing the image data output of the control information/image data separation means in accordance with the control information; and image data storage means for storing the output of the image data processing means. and storage signal generation means for generating a storage signal for image data from the control information of the control information/image data separation means; and storage of image data from the image data storage means based on the output from the storage signal generation means. A storage image data storage means for capturing and storing; a storage image data reading control means for receiving a reading support signal from the outside and controlling reading and writing of the storage signal generating means and the storage image data storage means; and a storage image data reading control means for the storage image data storage means. an image reproducing apparatus, comprising: display means for switching between the output of the image data storage means and the output of the saved image data storage means in accordance with the output of the image data storage means and outputting a display output signal to the outside.