JP3303979B2 - Image playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an image reproducing apparatus for reading out an image signal stored in a storage medium such as a semiconductor memory and displaying it on a monitor or the like. The present invention relates to an image reproducing apparatus that can simultaneously display images on a computer.

[0002]

2. Description of the Related Art Conventionally, there has been known a screen reproducing apparatus for reading data from a storage medium on which a digital image signal is recorded, converting the data into an analog video signal, and displaying it on a monitor or the like. For example, as a storage medium, I
An image reproducing device in a digital still camera system using a C memory card.

[0003] These image reproducing apparatuses store data read from a storage medium in a buffer memory such as a field memory or a random access memory (RAM), and perform D / A conversion and conversion to an analog video signal. And outputs it to an image display device such as a television monitor. By the way, an image storage medium such as an IC memory card can usually store a plurality of images. For example, as an index screen, all the images stored in the storage medium can be stored in one image.
There is a way to display on one screen.

FIG. 10 is a block diagram showing a conventional image reproducing apparatus. As shown in FIG.
The compressed data read out of the RAM 10 is decoded by the decoder 101, and the RAM 10 corresponding to each of RGB
Image data is sequentially written to 2, 103 and 104.
Next, each color data is read out simultaneously from the RAMs 102, 103, and 104, and the D / A converter 10 corresponding to each color is read out.
The signals are converted into analog signals by 5, 106 and 107.
This analog signal is a Y signal by a matrix circuit 108,
(R−Y) signal and (B−Y) signal.
The color difference signal between the (Y) signal and the (BY) signal is
The chromaticity signal C is provided to the C encoder 109 and is formed. Further, the Y signal, the C signal, and the synchronization signal from the timing signal generator 110 are added by the adder 111 to become an NTSC signal.

[0005]

By the way, in the conventional image reproducing apparatus, when an image stored in a storage medium is displayed as a reduced image on a multi-screen, for example, only eight screens are stored. Are displayed only in eight screens in the upper half of the screen. As shown in FIG. 11, in this case, the lower half of the screen becomes blank, and it is inconvenient to know how many images can be stored. Further, when a plurality of image data having different data compression ratios are stored in a storage medium, the conventional image reproducing apparatus does not know at all how many remaining images can be stored in the storage medium. An object of the present invention is to solve such a problem.

[0006]

[0007]

According to the present invention, there is provided an image reproducing apparatus, comprising: a first storage means capable of storing compressed image data in units of one screen; and a second storage means capable of storing image data of one screen. Detecting means for detecting the maximum number of screens of image data when only the image data compressed at the minimum compression rate is stored in the first storage means; A dividing unit that divides a storage area of the storage unit; a reducing unit that reduces each image data read and decoded from the first storage unit in units of one screen so as to fit in one section divided by the dividing unit; the image data reduced by the reduction means at a predetermined partition means and writing no
Both the minimum integer S satisfying S ≧ q / p and S _min
When the image data is written
Easily distinguished from image data in (S _min -1) sections
Composing means for writing specific image data that can be provided. Note that the synthesizing means further has a function of writing image data indicating an unrecorded state, which can be easily distinguished from normal image data, into the remaining sections of the second storage means where no image data has been written. You may.

[0008]

According to the image reproducing apparatus of the first invention, the maximum number of screens of image data that can be stored in the first storage means is detected by the detection means. Then, the storage area of the second storage means is divided by the dividing means so as to be divided into sections equal to or larger than the maximum number of screens, and each image data read from the first storage means in units of one screen is contained in this one section. It is reduced by reduction means. Then, by using the synthesizing means, the reduced images of all the image data stored in the first storage means are stored in the second storage means.
The image data is written in a predetermined section of the storage means, and specific image data which can be easily distinguished from normal image data is written in the remaining sections.

According to the image reproducing apparatus of the second invention, the maximum number of screens of the image data when only the image data with the minimum compression rate is stored in the first storage means is detected by the detection means. The storage area of the second storage device is divided by the dividing unit so as to have the number of partitions equal to or larger than the maximum number of screens, and the reducing unit is configured so that each image data read from the first storage unit in units of one screen is contained in this one partition. Is reduced by Then, using the synthesizing means, the reduced images of all the image data stored in the first storage means are written in predetermined sections of the second storage means, and further, the images are stored in the same section as this image data or in another section. Specific image data is written so that the data compression ratio becomes clear.

[0010]

An embodiment of the present invention will be described below.
FIG. 1 is a block diagram of an image reproducing apparatus according to one embodiment of the first invention and the second invention. As shown in the figure, the image data read from the IC memory card 1 as the first storage means is decoded by the decoder 2 and supplied to the reduced screen forming circuit 3 as the reduction means. The reduced screen forming circuit 3 reduces the input image to 1 / n and outputs it by a signal indicating the reduction ratio n sent from the system control circuit 4 which is a detecting means and a dividing means. The specific image forming circuit 5 outputs a specific image that can be stored in an unstored area of the IC memory card 1. A switch 6, which is a synthesizing unit, is controlled by the system control circuit 4, and performs switching between a reduced image and the above-described specific image during multi-screen reproduction and switching between multi-screen reproduction and normal screen (single-screen) reproduction. The image data output from the switch 6 is sequentially written to RAMs 7, 8, and 9 as second storage means corresponding to R, G, and B, respectively. Next, RAM
Each color data is simultaneously read from 7, 8, and 9, and is converted into an analog signal by D / A converters 10, 11, and 12 corresponding to each color. This analog signal is converted into a Y signal, an (RY) signal, and a (BY) signal by a matrix circuit 13, and a color difference signal between the (RY) signal and the (BY) signal is further converted into an NTSC encoder 14. And a chromaticity signal C is formed. Further, the Y signal, the C signal, and the synchronization signal from the timing signal generator 15 are added by the adder 16 to become an NTSC signal.

When the image reproducing apparatus of this embodiment is used, FIG.
As shown in (1), for example, the vertical and horizontal directions of the screen can be divided into 16 by 4 × 4, and a maximum of 16 images can be displayed on one screen. FIG.
FIG. 4 is an explanatory diagram for creating a reduced image by data thinning. Normally, all decoded image data is stored in the corresponding RAM. However, when a 1/16 reduced image is generated, only pixel data separated by 4 pixels in both the vertical and horizontal directions is stored (for example, FIG. 3). Pixel data with hatching). At this time, in the RAM address where each reduced image is stored, the reduced images are set in the order in which the display positions of the images are, for example, as shown in FIG. 2, and a maximum of 16 images are simultaneously displayed on one screen.

The IC memory card 1 is controlled by a memory card control circuit 17, and the RAMs 7, 8, and 9 are controlled by a RAM control circuit 18. Also,
The timing signal generator 15 controls all timings of each processing block, and these are further controlled by the system control circuit 4. Further, in the present embodiment, since the stored image data does not necessarily have to be compressed data, the decoder 2 may not be necessary. Further, a specific image can be realized by the system control circuit 4 writing specific data to a desired address of each RAM in accordance with a program in the system control circuit 4. At this time, the specific image forming circuit 5 May not be required.

Next, the operation of the embodiment of the first invention will be described with reference to the flowchart of FIG. In the figure, when the IC memory card 1 is inserted into the image reproducing apparatus (step 30), the system control circuit 4
A signal for determining the storage capacity is read from the C memory card 1 (step 31). This read I
The maximum number m of images that can be stored in the IC memory card 1 is obtained from the C memory card capacity and the predetermined memory capacity required to store one screen (step 3).
2). Next, the minimum value among the integers N satisfying N ² ≧ m is set to n (step 33), and the reduction ratio is determined to be 1 / n. Next, the system control circuit 4 controls the memory control circuit 17 to read the first compressed image data from the IC memory card 1. This image data is decoded by the decoder 2 and input to the reduced screen forming circuit 3 and the switch 6. The switch 6 is controlled so as to output decoded data to the RAMs 7, 8, and 9 during multi-screen reproduction (contact b). At this time, the system control circuit 4 instructs the reduced image forming circuit 3 on the image reduction rate n (step 34), and the reduced screen forming circuit 3 converts the input image to n.
The output is reduced to one-half. The reduced image data is stored in the RAMs 7, 8, and 9 under the control of the RAM control circuit 18 so as to be synthesized at a predetermined position on the multi-screen (step 35). In this manner, all the image data in the IC memory card 1 is converted into reduced image data in the RAM 7,
Stored in 8 and 9 (step 36). Next, the system control circuit 4 switches the switch 6 to the contact c, and
The RAM control circuit 18 is controlled to combine specific images of the remaining number of screens that can be stored in the memory card 1 at predetermined positions of the multi-screen, and store them in the RAM 7, 8, 9 (step 37). Thereafter, multi-screen reproduction is performed by the same operation as in the conventional example (step 38). FIG. 5 shows a display example of the multi-screen configured as described above. In the display example of FIG. 5, one screen is a reduced screen area (16 frames) of 16 frames.
The image data reduced by the reduced image forming circuit 3 is allocated to the reduced screen area of 1 to 8 frames in the upper half. Further, a specific image for displaying non-recording is allocated to the reduced screen area of 9 to 16 frames in the lower half.

Next, the operation of the embodiment of the second invention will be described with reference to the flowchart of FIG. In the figure, the IC memory card 1 is inserted (step 5).
0), the system control circuit 4 reads a signal for determining the storage capacity from the IC memory card 1 (step 51). Based on the read capacity of the IC memory card and the memory capacity required to store one screen at a predetermined minimum compression ratio (p: for example, p = 1/10), the IC memory card 1 can be stored. The maximum number of images m 'is obtained (step 52). Next, N ²
The minimum value among the integers N satisfying ≧ m ′ is set to n ′ (step 53), and the reduction ratio is determined to be 1 / n ′. Next, the system control circuit 4 controls the memory control circuit 17 to read the first compressed image data from the IC memory card 1. This image data is decoded by the decoder 2 and input to the reduced screen forming circuit 3 and the switch 6. The switch 6 is controlled so as to output decoded data to the RAMs 7, 8, and 9 during multi-screen reproduction (contact b). At this time, the system control circuit 4 instructs the reduced image forming circuit 3 on the image reduction ratio n '(step 5).
4) The reduced screen forming circuit 3 reduces the input image to 1 / n 'and outputs it. The reduced image data is stored in the RAMs 7, 8, and 9 under the control of the RAM control circuit 18 so as to be synthesized at a predetermined position on the multi-screen (step 5).
5). Now, the compression ratio of image data (q: for example, q = 1 /
The minimum value (s) of the integer (S) satisfying (S ≧ q / p) with respect to 2) is set to the number of reduced image occupied frames (s = 5 in this example) of this image data (step 56), and the system control circuit 4 switches the switch 6 to the contact point c and controls the RAM control circuit 18 to store the specific image data in (s-1) reduced screen areas on the multi-screen at predetermined addresses in the RAMs 7, 8, and 9. Memorize (Step 5
7). In this way, all the image data in the IC memory card 1 is stored as reduced image data in the RAMs 7, 8, and 9 (step 58). Thereafter, multi-screen reproduction is performed by the same operation as in the conventional example (step 59). FIG. 7 shows a display example of the multi-screen configured as described above. In the display example of FIG. 7, one screen is divided into 16 reduced screen areas (16 sections), and the first image data occupying the reduced screen area of the upper left one or two frames has a maximum compression ratio of 1/10. On the other hand, the compression ratio is 1/5, and the second image data occupying the reduced screen area of the third frame has a compression ratio of 1/10. Further, the third image data occupying the reduced screen area of 4 to 6 frames has a compression ratio of 3/10.

Next, the operation of the application example of the second invention will be described with reference to the flowchart of FIG. In the figure, the operations from step 70 to step 78 are the same as the operations from step 50 to step 58 in the second embodiment of FIG. Further, in this application example, the RAM control circuit 18 is controlled so as to combine another specific image corresponding to the number of remaining screens that can be stored in the IC memory card 1 at a predetermined position on the multi-screen, and is stored in the RAMs 7, 8, and 9. (Step 79). Thereafter, multi-screen reproduction is performed by the same operation as in the conventional example (step 80). FIG. 9 shows a display example of a multi-screen configured as described above. This drawing is different from the display example of FIG. 7 in that a specific image for displaying non-recording is assigned to a reduced screen area of 15 or 16 frames.

Each of the embodiments and the applied examples has a RAM for storing a normal screen (single screen) and a multi-screen.
Have been described as the same RAM, but separate RAMs may be used for a single screen and for a multi-screen. Further, the specific images for the remaining number of storable screens in each embodiment and application example were finally stored in the RAM (FIG. 4: Step 3).
7, FIG. 8: step 79), a method in which this specific image is stored in advance in all the RAMs and the reduced image data or the compressed image data occupied frame area specific image data is stored in the RAM again. Further, the position of each specific image data on the multi-screen in each embodiment and application is not limited to those shown in FIGS. 5, 7, and 9 and may be displayed at any position on the divided screen. The storage means is an IC
It is not limited to a memory card, but may be a magnetic disk, a magneto-optical disk, an optical disk, a magnetic card, a magneto-optical card, an optical card, or a magnetic tape. Furthermore, although data thinning has been described as a method for obtaining a reduced image, other known methods (for example, when the reduction ratio is n, the average value of n × ² pixels in the vertical and horizontal directions is calculated as one pixel of the reduced image. Etc.). In each of the present embodiment and the application example, the RAMs 7, 8, and 9 are used as the memories for displaying images, but they may be field memories.

[0017]

[0018]

As described in detail above, according to the image reproducing apparatus of the present invention, even when the storage medium storing the image data of various different compression ratios is used as the first storage means, the first storage means can be used. All images stored in one storage means can be simultaneously displayed on one screen, and furthermore, a compression ratio in which each image data occupies a number of frames as compared with one frame of the image data having the minimum compression ratio. You can know if it is memorized. Further, the number of remaining screens that can be stored in the storage means can be known at a glance.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an example of division of a multi-screen according to the embodiment.

FIG. 3 is an explanatory diagram for creating a reduced image by pixel thinning.

FIG. 4 is a flowchart showing the operation of the embodiment of the first invention.

FIG. 5 is a display example of a multi-screen according to the embodiment of the first invention.

FIG. 6 is a flowchart showing the operation of the embodiment of the second invention.

FIG. 7 is a display example of a multi-screen according to the embodiment of the second invention.

FIG. 8 is a flowchart showing an operation of an application example of the second invention.

FIG. 9 is a display example of a multi-screen according to an application example of the second invention.

FIG. 10 is a block diagram of an image reproducing apparatus according to a conventional example.

FIG. 11 is a display example of a multi-screen according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... IC memory card 2 ... Decoder 3 ... Reduced screen forming circuit 4 ... System control circuit 5 ... Specific image forming circuit 6 ... Switch 7, 8, 9 ... RAM 10, 11, 12 ... D / A converter 13 ... Matrix Circuit 14 ... NTSC encoder 15 ... Timing signal generator 16 ... Adder

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ikuyoshi Ito 1-1-21-17 Takashima, Suwa-shi, Nagano Chino Corporation (72) Inventor Hisashi Niwa 1-1-21-17 Takashima, Suwa-shi, Nagano Chino (56) References JP-A-2-248174 (JP, A) JP-A-1-179191 (JP, A) JP-A-64-51778 (JP, A) JP-A-62-266673 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 5/14 G09G 5/36 H04N 1/387 G06T 1/00

Claims (2)

(57) [Claims] A first storage means as claimed in claim 1] can store image data compressed by the compression rate q in each screen, and a second storage unit that can store image data for one screen, it is compressed at the minimum compression rate p Detecting means for detecting the maximum number of screens of the image data when only the detected image data is stored in the first storage means; and storing the storage area of the second storage means in a section equal to or larger than the maximum number of screens detected by the detecting means. Dividing means for dividing each image data read out from the first storage means in units of one screen so as to fit in one section divided by the dividing means, and reduced by the reducing means. write Mutotomoni each partition of each of the second storage means each image data, satisfy the S ≧ q / p
When the minimum value of the integer S to be added is S _min , the image data
(S _min -1) sections continuous to the section where the data was written
An image reproducing apparatus, further comprising: synthesizing means for writing specific image data which can be easily distinguished from image data . 2. A first storage unit capable of storing image data compressed by the compression rate q in each screen, and a second storage unit that can store image data for one screen, is compressed at the minimum compression rate p Detecting means for detecting the maximum number of screens of the image data when only the detected image data is stored in the first storage means; and storing the storage area of the second storage means in a section equal to or larger than the maximum number of screens detected by the detecting means. Dividing means for dividing the image data read and decoded from the first storage means in units of one screen so as to fit into one section divided by the dividing means; and writing the image data reduced by said reduction means a predetermined compartment Mutotomoni, integer satisfying S ≧ q / p
When the minimum value of the number S is S _min , the image data is written.
(S _min -1) continuous sections
Combining means for writing specific image data which can be easily distinguished from image data, and writing image data indicating unrecorded which can be easily distinguished from normal image data in the remaining sections. Playback device.