JP2687367B2 - Image data transfer control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data transfer control device, and particularly to first image data extracted by thinning out image data, and first image data.
The present invention relates to an image data transfer control device capable of performing high-speed image retrieval even when an image has a high density by separately storing the extracted image data into the remaining second image data. [Prior Art] In an image processing apparatus, it is general to read a storage original by using a CCD sensor or the like, and convert the read image signal into a digital signal and store it. For example, as shown in FIG. 3A, a CCD sensor (not shown) sequentially scans the storage original X from the 1st to the 32nd lines, and inputs the obtained image data to the image memory. . FIG. 3B shows a state in which the image data of the original document X for storage is input to the image memory 2, and the image data has addresses A ₁ , A ₂ , A ₃ ... A _{1024 of the} image memory according to the scanning order. Be paid in. In the conventional image data transfer control device, the image data in the image memory is stored in the optical disk, shown in FIG.
In the external storage means 7 such as a magnetic disk, A ₁ → D ₁ , A ₂ → D ₂ , A ₃
→ D ₃ … A ₁₀₂₄ → D ₁₀₂₄ Store at the corresponding address. Further, when outputting already stored image data, all the image data on the external storage means 7 is transferred to the image memory 2 and displayed on a CRT or the like, or printed out by a printer. The image data may be subjected to signal compression by MMR or the like and stored in the external storage device 7. [Problems to be Solved by the Invention] However, according to the conventional image data transfer control device,
For example, when searching for image data in an external storage device, the stored image data is read in the order of addresses and displayed on the display. Therefore, since the amount of information of image data is generally large, the read time becomes long, and for example,
There is a limit to the speedup in turning pages of optical files. Further, there is a disadvantage that the access becomes extremely slow as the image data becomes higher in density. [Means for Solving the Problems] The present invention has been made in view of the above, and in order to enable high-speed image retrieval even when the image data has a high density, a first plurality of consecutive addresses is used. Image generating means for generating a first image formed by a plurality of pixels corresponding to, and at least thinning a predetermined plurality of addresses from the first plurality of addresses in accordance with the reduction ratio of the first image. Generate an intermittent second plurality of addresses in one copy,
Further, address generating means for generating a third plurality of addresses from the predetermined plurality of addresses, and a plurality of pixels corresponding to the second plurality of addresses are extracted from the first image to make the memory continuous. Writing to a first area corresponding to a fourth plurality of addresses,
A plurality of pixels corresponding to the third plurality of addresses are extracted from the image of No. 3, and written in a second area corresponding to a continuous fifth address of the memory, and are written in the first area of the memory. When the plurality of written pixels are read out and displayed on a display, a control means is provided for reading out by the fourth plurality of addresses and displaying a second image by the second plurality of addresses. A transfer control device for image data is provided. Hereinafter, the image data transfer control device of the present invention will be described in detail. [Embodiment] FIG. 1 shows an embodiment of the present invention. A reading device 1 having a CCD sensor for outputting image data, an image memory 2 for storing the image data from the reading device 1, and an image data transfer. Address signal generating means 3 for generating an address of an image memory as a transfer source and an address of an image memory as a transfer destination, an optical disk 4 for inputting and storing image data through an input / output interface 9, and an address signal. Based on the address signal of the generation means 3, the control means 5 for controlling the transfer of the image data between the image memory 2 and the optical disc 4, and the image data on the image memory 2 are inputted and displayed via the input / output interface 9. Display 6, a DMA controller 8 for DMA transfer of data without going through the control means 5, a keyboard for inputting various commands, etc. It has a force means 10. In the above configuration, the transfer of image data will be described separately for transfer from the image memory 2 to the optical disk 4 and transfer from the optical disk 4 to the image memory 2. Transfer from the image memory 2 to the optical disk 4 (FIGS. 2A and 2B). Addresses A ₁ and A of the image memory 2 input from the reading device 1
₂ , A ₃ ... Transfers the image data stored in A ₁₀₂₄ to the optical disc 4 by the following addressing. When a thinning command, a thinning rate, etc. are input to the control means 5 via the input means 10 such as a keyboard, the address signal generating means 3 outputs a first address signal. For example, thinning rate 1/3
(2 lines thinning) and the addresses of the leading lines of the image memory 2 and the optical disc 4 are set to 1, the relationship between the extraction line of the image memory 2 and the addressed line of the optical disc 4 is as follows. This is the first address signal. First of all, the first address of the image memory 2 is changed by the first address signal.
The line is accessed and the content of the address A ₁ (transfer source address) of the image memory 2 is transferred to the address D ₁ (transfer destination address) of the optical disk 4. Then, output from the address signal generating means 3 to the address A _2, A _3, A ₄ ... and A _32, are transferred similarly to the optical disc 4 address _{D 2, D 3, D 4} ... D 32. When the transfer of the first line of the addresses A _{1 to} A ₃₂ of the image memory is completed, the address signal generating means 3 starts the addresses A ₃₃ and A ₆₅ based on the set thinning rate 1/3 and outputs the second and third addresses. Two lines are skipped, and the addresses A _{97 to} A ₁₂₈ of the 4th line are output. Based on this output
The control means 5 transfers the contents of the addresses A _{97 to} A ₁₂₈ of the image memory 2 to the addresses D _{33 to} D ₆₄ of the second line of the optical disc 4. Similarly, the image data is transferred from the image memory 2 to the optical disc 4 in accordance with the first address signal (address obtained by thinning out two lines of the image memory 2) of the address signal generating means 3. The first to eleventh lines of the optical disc 4 are set as the first area M1 for storing the extracted image data.
When the transfer of the first address signal is completed, the address signal generating means 3 continues to output the second address signal. The second address signal is expressed in the same correspondence relationship as the first address signal as follows. The second address signal designates the remaining address on the image memory 2 which is skipped when the first address signal is output. The contents of the second and third lines starting from the addresses A ₃₃ and A _65. Is the address D of optical disk 4
2nd starting from the 12th line with ₃₅₃ as the start address
Sequentially transfer to area M2, and then the extracted address A
Skip the fourth line of ₉₇ (already transferred with the first address signal) and transfer the two fifth and sixth lines starting at addresses A ₁₂₉ and A ₁₆₁ . Similarly, all the remaining lines are designated and the transfer is completed. By the above operation,
As shown in FIG. 2B, the first area of the optical disc 4
1/3 of the image data on the image memory 2 thinned / extracted by the first address signal is stored in M1, and the remaining 2/3 of the image is stored in the second area M2 by the second address signal. The data is transferred, and all the image data on the image memory 2 is stored in the optical disc 4. Transfer from the optical disc 4 to the image memory 2 (FIGS. 2B and 2C). When an image data search command is input to the control means 5 via the input means 10 such as a keyboard, the address signal generation means 3 outputs a first address signal. Control means 5
Transfers the image data of the optical disk 4 to the image memory 2 in order from the address D ₁ based on the first address signal.
As described above, the address signal generating means 3 outputs to the first line starting from the address A ₁ of the image memory 2 on the basis of the first address signal, and then outputs the addresses A ₉₇ , A ₁₉₃ , A _289.
In order to output to the 4th, 7th, and 11th lines of ..., The image data of the first area M1 of the optical disc 4 is transferred as shown in FIG. 2 (c), and is displayed via the input / output interface 9. 6 is displayed. At this point, 1/3 of the image data stored in the optical disk 4 has been transferred and displayed on the image memory 2 and the display 6. Thereafter, the image data of the second area M2 of the optical disc 4 is transferred based on the second address signal of the address signal generating means 3, and the untransferred (and undisplayed) portions of the image memory 2 and the display 6 are interpolated. Then, the entire image data shown in FIG. 2A is reproduced. As described above, in reading, first, the thinned image data (first
By reading the area M1) of No. 2) and displaying it on the display 6, the image quality is inferior, but the image data can be viewed at high speed (in the embodiment, since two lines are thinned out, the image data is displayed in 1/3 the time). . By subsequently interpolating the stored thinned data (second region M2), the image quality improves with time, and finally the original image quality stored is returned to complete the reading. In general, in a system using the optical disk 6, there are many cases where sentences and the like are registered and searched, and when searching for a specific page from a report of hundreds of pages, it is possible to find a specific page by looking at all the reports one by one. Many. In such a case, if the function of the image data transfer control device of the present embodiment is used, for example, it is sufficient if the image data can be identified.
Only by reading the first area M1, it is possible to proceed to check the next page and speed up the search. In other words, you can conduct a search like flipping through books,
The operability can be improved. Although the thinning rate is set to 1/3 in the embodiment, it may be set to 1/4 or 1/5, and an optimum value is selected in consideration of both image quality and speedup. Although an optical disk is used as the external storage device in the above embodiments, the external storage device may be configured by a magnetic disk or the like. Further, although the image data is transferred between the image memory for reading or displaying and the external storage device, the present invention is not limited to this. Furthermore, the first and second address signals are stored in a continuous series of address signals with a thinning interval, and the image data is stored in a compressed pattern in the sub-scanning direction as shown in FIG. 2B. If there is enough capacity, the data may be stored in a pattern having a thinning interval without being compressed. Of course, in any case, a signal compression method based on run length may be adopted. Further, the thinning-out may be performed in the main scanning direction as in the sub-scanning direction. Furthermore, if the data transfer is performed by DMA, the load on the control unit can be reduced. [Effects of the Invention] As described above, according to the image data transfer control device of the present invention, the first image data extracted by thinning out the image data and the remaining second image data extracted by the first image data are extracted. Since the image data is stored separately, it is possible to distinguish the image data without reading all the image data, and
High-speed image retrieval can be performed even when the image density is high.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIGS. 2A to 2C are explanatory views showing an embodiment of the present invention. 3A to 3C are explanatory views of a conventional image data transfer control device. DESCRIPTION OF SYMBOLS 1 ... Reading device 2 ... Image memory 3 ... Address signal generating means 4 ... Optical disk 5 ... Control means 6 ... Display 7 ... External storage device 8 ... DMA controller 9 ... Input / output interface 10 …… Input method

Claims (1)

(57) [Claims] An image generating unit that generates a first image formed by a plurality of pixels corresponding to a continuous first plurality of addresses, and a predetermined number from the first plurality of addresses according to a reduction ratio of the first image. Thinning out multiple addresses of at least 1
An address generating unit that generates an intermittent second plurality of addresses in the section and a third plurality of addresses from the predetermined plurality of addresses; and a second plurality of addresses from the first image. A plurality of pixels corresponding to the addresses are extracted and written in a first area corresponding to a fourth plurality of consecutive addresses of the memory, and a plurality of pixels corresponding to the third plurality of addresses from the first image. And writing in a second area corresponding to a continuous fifth address of the memory, and reading out the plurality of pixels written in the first area of the memory for display on a display, An image data transfer control device comprising: a control unit that reads out by the fourth plurality of addresses and displays a second image by the second plurality of addresses.