JPH026106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of inputting image information from an image input device into an image memory, and sending image information consisting of documents or figures stored therein to a CRT image display device for display, or for image printing. The present invention relates to an image processing device that sends image information to a device for printing, and in particular, this invention relates to an image rotation device that converts image information that digitally represents each picture element into an image that is rotated by 90 degrees to the right or left. The present invention relates to an image processing device having:

Generally, this type of image processing device is equipped with an image rotation device to return the image to its original, easy-to-see state, since images rotated by 90 degrees are difficult to see, but conventional image processing devices have a built-in image rotation device. Since the image is rotated by a processor, ie, software, the rotation process takes a long time.

The present invention has been made with attention to this point, and an object of the present invention is to provide an image processing apparatus that can reduce the time required for image rotation processing.

In the present invention, there is provided an image memory that stores image information in a word structure in which one word is represented by n bits, a selector that exchanges upper and lower bits of a word read from the image memory depending on the direction of rotation, and a first A buffer with an n×n bit configuration that can move image information in units of words in one direction and a second direction perpendicular to this, and a buffer that can continuously read out image information of n words or less from an image memory. buffer writing means for writing image information into the buffer while sequentially moving the image information in the first direction word by word; and buffer writing means writing the image information written by the buffer writing means in the second direction while sequentially moving the image information word by word. The above object is achieved by providing the image processing apparatus with image memory writing means for reading out n words and writing them into the image memory.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is an image input device, 2 is an image memory, 3 is an image display device, 4 is an image printing device, and 5 is an image rotation device. Images such as documents or drawings outputted from the input device 1 are written in the image memory 2, and are outputted from the image memory 2 to the image display device 3 for display, or are outputted to the image printing device 4. Configured to be output and printed.

The image rotation device 5 connected to the image memory 2 rotates the image rightward or leftward.
This is a 90° rotation device that rotates images by reading and writing from image memory 2. Figure 2 shows image 6 and image 7, which is the image rotated 90° to the right. It can be seen that image 7, which is rotated 90 degrees, is easier to see.

FIG. 3 shows a divided image 6A obtained by dividing the image 6 in FIG.
This shows a divided image 8 rotated by 90 degrees, assuming that the size of the buffer included in the image rotation device 5 shown in FIG. 1 is 16×16, and the image 6 shown in FIG. 2 is 16×16.
When divided in the direction of , a divided image 6A shown in FIG. 3 is obtained.
are rectangular blocks 61 to 64 and rectangular block 6.
It is divided into 5 and 66. The divided image 8 shown in FIG.
It is divided into 86 parts. This means that the image memory 2 has 16 bits in the horizontal direction as one word, and the word in the vertical direction.
In order to configure one block with 16 bits, that is, 16 words, the rectangular blocks 85 and 86 are made by rotating the rectangular blocks 65 and 66 and filling the hatched areas with zeros to form rectangular blocks. Figure 4 shows a divided image 9 obtained by rotating the divided image 6A of Figure 3 by 180 degrees to the right, and a divided image 9 rotated to the left.
A divided image 8A rotated by 90 degrees is shown in FIG. This is what I did. In addition, in FIG. 3, the square blocks 61 and 81,
Square blocks 62 and 82, square blocks 63 and 8
3, and the square blocks 64 and 84 correspond to each other.

Next, FIG. 5 is a block diagram showing details of the image rotation device 5 according to the image processing apparatus of the present invention.
1 is a selector for selecting the input 53 from the image memory 2 according to the rotation direction, and 52 is a buffer for storing the output 54 of this selector 51 to obtain an output 55 rotated by 90 degrees.

Next, FIG. 6 is a block diagram of the selector 51. This selector 51 is designed to obtain one output from two inputs.The 16-bit input 53 is used as the A input, and the upper and lower bits are B is the inverted version of
The A input or the B input is selected according to a rotation direction command 56, and an output 54 is output. In addition, the rotation direction command 5
6 operates to select the above-mentioned B input during clockwise rotation.

Next, FIG. 7 is an enlarged view of the image memory of the long block 65, with words "650" to
It is composed of "657".

Next, FIG. 8 is a configuration diagram of the buffer 52,
The state in which the long block 65 is inputted is shown with parallel diagonal lines, and the selector 51 selects the seventh block in response to the B input selection instruction of the rotation direction command 56.
The image shown in the figure is inverted by 180 degrees and the image shown in FIG. 8 is output.

The above-mentioned operation will be explained in more detail as follows.

First, the image rotation device 5 rotates the image from the image memory 2.
The word "650" shown in FIG. 7 is read out and input to the selector 51. Then, from this selector 51, B
The input is output to buffer 52 and stored in horizontal word "0" of buffer 52. Next, the image rotation device 5 reads the word "651" from the image memory 2 and inputs it to the buffer 52 via the selector 51.

Here, the word structure in the horizontal direction of this buffer 52 is defined as a first word structure, and the word structure in the vertical direction is defined as a second word structure. Then, the first word "0" of the buffer 52 is moved to word "1", and at the same time, the operation of storing a new word in word "0" is repeated, and the words "650" to "650" are stored.
"657" is the first word "0" of Batsuhua 52 ~
Save to "7". After this, the image rotation device 5
The second word "15" is read from the buffer 52 and written to the beginning of the rectangular block 85 in the image memory 2.

Next, the image of the buffer 52 is moved one bit to the right, the overflow from the second word "15" is discarded, and a zero is inserted into the second word "0" to erase it. . And then again Batsuhua 52
The second word "15" is read from and written into the next word of the rectangular block 85 of the image memory 2.
When this operation is repeated 16 times, the image in the buffer 52 is sent to the image memory 2, and the image in the buffer 52 is sent to the image memory 2.
2 will be filled with zero. In other words, the image is in a state of being erased. The image is rotated by executing the operations described above for all blocks.

Next, FIG. 9 is a 1-bit block diagram of the buffer 52, which includes a selector 520 and a data latch 5.
21, and the selector 52
The A input 522 of 0 is the output of the upper data latch in the vertical direction [the top row is the input 54], and the B input 523 of this selector 520 is the output of the left data latch in the horizontal direction (the leftmost one is the 0 input). . The movement direction command 57 is a movement in the vertical direction, or
or horizontal direction movement, and acts to select the A input 522 during vertical movement, and the clock input 58 inputs the output of the selector 520 to the data latch 521. It's the timing.

As described above, according to the present invention, an image is rotated using hardware incorporating an n×n buffer of a word structure expressed by one word of n bits that can be moved in two orthogonal directions.
Not only can the image rotation processing time be shortened, but
Because the distance between the elements that make up the buffer is short and the load is light, the processing speed of image processing equipment can be increased and
This has the excellent effect of facilitating LSI implementation.

In the above-mentioned embodiment, a rectangular buffer having a 16×16 configuration was described, but the present invention is not limited to this, and the same effect can be obtained with any rectangular buffer. Needless to say, it will happen.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the rotation operation of an image, FIGS. 3 and 4 are diagrams of a divided image and the rotation operation of this image, and FIG. 6 is a block diagram showing an image rotation device according to the image processing apparatus of the present invention, FIG. 6 is a configuration diagram of a selector, FIG. 7 is an enlarged view of an image memory, FIG. 8 is a configuration diagram of a buffer, and FIG. 9 is 1 of batshua
FIG. 2 is a block diagram of a bit. In the drawing, 1 is an image input device, 2 is an image memory,
3 is an image display device, 4 is an image printing device, 5 is an image rotation device, 6 and 7 are images, 6A, 8, 8A, and 9 are divided images, 51 and 520 are selectors, 52 is a buffer, and 521 is a data latch. be. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. An image processing device having an image rotation means for rotating image information digitally representing each picture element, comprising an image memory that stores the image information in a word structure in which each word is represented by n bits. The image rotation means includes a selector for exchanging the upper bits and lower bits of the word read from the image memory depending on the rotation direction, and a selector for rotating the image information into the word in a first direction and a second direction perpendicular thereto. a buffer having an n×n bit configuration that can be moved in units; and image information of n words or less is continuously read from the image memory, and the read image information is sequentially moved in the first direction in units of words. buffer writing means for writing into the buffer while moving the image information, and an image memory for reading n words continuously while sequentially moving the image information written by the buffer writing means in the second direction word by word, and writing it into the image memory. An image processing device comprising: writing means.