JP3037364B2 - Image playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to an image reproducing device for displaying a received still image.

2. Description of the Related Art An HDTV has a large number of scanning lines, has a fine image, and has very little flicker, so that it can be enjoyed not only as a moving image but also as a still image. For this reason, it is expected to be used in fields such as art, culture, and animation.
In the case of a still image, a viewer is steadily looking at the screen over a period of several seconds to ten and several seconds for one image, and studio quality is required as image quality. Therefore, apart from the HDTV moving image device, an HDTV still image reproducing device that can enjoy studio quality has been considered. FIG. 2 shows a conventional still image reproducing apparatus. The broadcast wave is received from the antenna of the receiving unit 201 and is converted into still image information. The output of the still image information is restored to the original still image data by the still image decoder 202, and is developed as a still image in the frame memory 203 by the frame memory control unit 204. The still image is read at a raster scan rate by the frame memory control unit 204, converted into an analog signal by the D / A converter 205, and displayed on the monitor 206 as a still image.

[Problems to be solved by the invention]

However, in the above-described conventional apparatus, a problem occurs when an arbitrary still image is frozen. In other words, if the data of the next image to be displayed when the freeze function is changed from ON to OFF is not written in the frame memory 203, the frame memory 203 is displayed on the monitor 206.
This is because the image that is being written to the file is displayed. The present invention has been made in view of the above-described problem, and in a case where the still image display on the display screen is canceled, the switching is not performed until another image to be displayed next has been written to the memory. Accordingly, it is an object of the present invention to provide an image reproducing apparatus which can always display a completed image.

[Means for Solving the Problems]

In order to solve this problem, the image reproducing apparatus of the present invention has the following configuration. That is, a memory having a capacity for a plurality of screens, a writing unit for writing a received image to the memory, a display control unit for reading the image written to the memory and displaying the image on a display, Setting means for performing a setting to stop, and switching means for switching the display on the display so as to display an image other than the image displayed on the display, the image being stored in the memory. The switching means, when the setting by the setting means is canceled, if the other image is an image being written by the writing means, until the writing by the writing means ends. An image reproducing apparatus, comprising: control means for controlling not to switch to another image.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of a still image reproducing apparatus according to an embodiment. In the figure, reference numeral 101 denotes a receiving unit that receives a broadcast wave input from an antenna and converts the received broadcast wave into still image information. Reference numeral 102 denotes a control signal separation circuit that displays display data (special effect instruction data in the received broadcast wave). For example, instruction data for displaying only a part, display time, and the like are included), absolute time data (reference time), and actual image data. Each of the separated data is connected to signal line 11
Output on 5,111,114. 103 is a control signal separation circuit 102
The still image decoder restores still image information separated from the original still image data. Reference numeral 104 denotes a frame memory capable of developing a plurality of restored still images. Reference numeral 105 denotes a frame memory control unit that controls writing and reading (display) of the frame memory 104, and a CPU that operates according to a program corresponding to a flowchart shown in FIG.
And so on. Reference numeral 106 denotes a D / A converter that converts image data read at a raster scan rate by the frame memory control unit 105 into an analog signal.
A monitor 07 displays a gradation image based on the converted analog signal. Reference numeral 108 denotes a time control unit that receives the absolute time data 111 separated by the control signal separation circuit 102 and notifies the frame memory control unit 105 of the absolute time. 109 denotes an ON / OFF state signal of the freeze switch 116 to the frame memory control unit 105. This is a freeze control unit for outputting. When the freeze switch 116 is turned on, the frame memory control unit 105
Does not write the new received image into the frame memory 1-4, but continues to display the image received and expanded earlier. In the above-described configuration, the still image reproducing apparatus according to the embodiment operates as follows when the freeze switch 116 is turned off from on. When the receiving unit 101 receives the next image, the receiving unit 101 writes the received image in a memory area other than the currently displayed frame memory as the next screen image data. When this writing is over,
A signal to that effect is output from the static decoder 103 to the frame memory control unit 105 via the signal line 110. The frame memory control unit 105 receives this signal and, when it is determined that the display time of the image has come, causes the frame memory 104 to display the next image developed according to the display data from 115. In brief, even when the phrase switch 116 is turned off, the next image is completely expanded in the frame memory 104 and the previous image is kept displayed until the display time is reached. Thus, when the freeze switch is turned off as in the related art, it is possible to prevent display of the contents of the frame memory 104 in which nothing has been written or that has been written halfway. Will be possible. Next, the control operation of the frame memory control unit 105 will be described with reference to the flowchart of FIG. When the power of the apparatus is turned on, first, in step S1, it is determined whether or not the freeze switch 116 is on. If it is in the OFF state, the process proceeds to step S2, and writing of the received image to the frame memory 104 is permitted. And
Proceeding to step S3, it is determined whether or not a signal has been received from the still image decoder 103 indicating that image writing for one screen has been completed. If not, the process returns to step S1. When the writing of the image on one screen portion is completed, the process proceeds to step S4, and waits until the display time of the image for which writing has been completed. When the display time comes, the process will
Proceeding to S5, display of the image on the monitor 107 is started. In this way, a still image is displayed on the monitor 107.If the freeze switch 116 is turned on during the display, the process proceeds to step S6, in which the writing of the received image to the frame memory 104 is prohibited, and the current display is performed. The displayed image continues to be displayed. Now, in this state, when the freeze switch 16 is turned off, the processing from step S2 described above is performed.
The point to be noted here is that the display of the currently displayed image is continued until the reception of the next image is completed and the display time of the received image is reached (the display of the received image is performed only in step S5). Done). As described above, according to the present embodiment, even if the freeze switch is turned off and the display instruction of the next image is issued, the capture of the next image is completed, and the previously captured image is not displayed until the display time comes. Continue to be displayed. Therefore, it is possible to prevent an image that has not yet been written in the frame or that is being written from being displayed. Note that, in the embodiment, a device that mainly displays a still image from a satellite broadcast has been described as an example. However, in the case of an image having no display time instruction, it may be displayed as soon as writing is completed. .

【The invention's effect】

As described above, according to the present invention, when the still image display on the display screen is released, the switching is not performed until the writing of the other image to be displayed next to the memory is completed. It is possible to always display a completed image.

[Brief description of the drawings]

FIG. 1 is a block diagram of a still image reproducing apparatus in an embodiment, FIG. 2 is a diagram showing a conventional apparatus configuration, and FIG. 3 is a flowchart showing control contents of a frame memory control unit in the embodiment. In the figure, 101 and 201 ... receiving unit, 102 ... control signal separation circuit, 103 and 202 ... still picture decoder, 104 and 203 ... frame memory, 105 and 204 ... frame memory control unit,
106 and 205: D / A converter, 107 and 206: Monitor, 108: Time control unit, 109: Freeze control unit, 116
…… It ’s a freeze switch.

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-76379 (JP, A) JP-A-2-63396 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/907

Claims (3)

(57) [Claims] A memory having a capacity for a plurality of screens; a writing unit for writing a received image to the memory; a display control unit for reading the image written to the memory and displaying the image on a display; Setting means for performing a setting to freeze the display, and switching to switch the display of the display so as to display an image stored in the memory other than the image displayed on the display. The switching means terminates the writing by the writing means when the setting by the setting means is canceled and the other image is an image being written by the writing means. Up to this point, an image reproducing apparatus including a control means for controlling not to switch to the other image. 2. The image reproducing apparatus according to claim 1, wherein the image displayed on the display is kept displayed until switching to the other image is performed. 3. The image according to claim 1, wherein the switching to the other image is performed after waiting for a time at which the other image is to be displayed. Playback device.