JPS5862766A - Projecting operation device - Google Patents

Abstract

PURPOSE:To perform high speed processing with a simple hardware, by binarizing a video signal, storing accumulated data in the longitudinal direction of screen, and transferring the content to a main storage means via a DMA transfer control means. CONSTITUTION:An input video signal is converted into a white or black binary coded video signal at an AD converter 1. This signal is given to a 8-bit counter 2 to count the number of white signals from the beginning of one horizontal scanning to the end. The number of white signals being the content of the counter 2 during the horizontal blanking period is transferred to a main storage means 4 via a DMA transfer control means 3. Through the sequential horizontal scanning for this operation, a projection data to the vertical axis of a screen is obtained at a main storage means 4. Further, a binarized video signal is inputted to a 8-bit adder 5, where the signal is summed with the projection data and the result is written in a shift register of a temporary storage means 6. The content of the means is transferred to the main storage means 4 via the DMA transfer control means 3 and the projecting operation for one screen's share is finished within the scanning time of one screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to data processing after a video signal from a TV camera is binarized. FIG. 1 shows how white or black on a binarized screen is projected onto the X and Y axes.

In the conventional projection calculation, as shown in Fig. 2, an input video signal is converted into a white or black binary digital video signal by an AD converter 1, and this signal is input to a buffer memory 8, and 1-bit serial data is converted into a digital video signal. After holding several bits and converting it into parallel data, it is sent to the main storage means 4 of the computer via the DMA transfer control means 3.

Projection calculations were performed on the screen data stored in the main storage means 4 using a software program.

Therefore, it takes time to scan one screen to transfer the screen data to the main storage means 4, and in addition to this, the software program requires 9 calculation hours, resulting in a slow processing speed. The present invention solves the above-mentioned conventional drawbacks and performs high-speed processing using simple hardware. Examples thereof will be described below with reference to FIGS. 3 to 6.

In FIG. 3, 1 is an AD converter, 2 is an 8-bit counter, 3 is a DMA transfer control means, 4 is a main storage means of the computer, 6 is an 8-bit adder, and 6 is a temporary storage means 256X.
An 8-bit shift register 7 controls the overall operation. In the above configuration, Fig. 4 is a simulated representation of the projection operation shown in Fig. 3, and the length x width of the screen is 266 x 256.
The operation will be explained using each column and row.

In FIG. 3, an input video signal is converted into a white or black binary video signal by AD conversion 1. This signal is used by an 8-bit counter 2 to count the number of whites from the beginning to the end of one horizontal scan. In the example of FIG. 4, the number of whites in row j and column i is four. The number of whites is counted during the final horizontal scan at 1=2664, and the number of whites in one line, which is the content of the counter 2, is counted through the DMA transfer control means 3 during the subsequent horizontal retrace time. and transfers it to the main storage means 4. The contents of this counter 2 are one line of projection data, and when the transfer is completed, the counter 2 counts in the same way at line j+1. By sequentially repeating this operation until j ==256), projection data on the vertical axis of the screen is obtained.

On the other hand, in FIGS. 3 and 4, the binarized video signal is input to an 8-bit adder 6. In the case of FIG. 4, the other input of the adder 6 receives the previous projection data 2 of the portion corresponding to column i from the shift register of the temporary storage means 6. That is, this line is vertical projection data up to i-1 in one column.

1 is added by the adder 5, and the resultant 3 is again written into the shift register of the temporary storage means 6, and the projection data of column i is updated. All of the above projection operations in the vertical direction are performed within the minimum unit time of screen scanning, that is, the time indicated by "*" in FIG.

Next, when the video signal becomes P, the temporary storage means i+
1.1 The shift register 6 shifts one position and reads the next 8 pit data, and repeats the same operation.The shift registers of the temporary storage means 6 correspond to the vertical and horizontal divisions of the screen, and are connected in a ring shape in a 256 x 8 bit configuration. The shift is performed in synchronization with the video signal binarized sample pulse. When the scanning is completed in this way up to the last 1==256°5=26e, the projection data on the horizontal axis of the screen is stored in the temporary memory 6. Utilizing the vertical retrace time immediately after this, the contents of the temporary storage means 6 are transferred to the main storage means 4 via the DMA transfer control means 3.
Transfer to. With the above steps, the projection calculation for one screen is completed within the scanning time for one screen.

In the above embodiment, the temporary storage means 6 is a shift register, but any other random access memory may be used as long as it is fast in speed and has a simple hardware configuration. Although the screen is divided into 256x2'66 sections and the counter 2 and adder 6 are 8 bits, they may be changed depending on the screen division. The operation of the 75 was explained assuming that the data is white, but it can also be handled in black.

According to the present invention, the results of the projection calculation are stored in the main storage means of the computer within the scanning time of one screen of the TV screen,
The effect is that processing can be performed at a higher speed than before with simple hardware.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of projection calculation, FIG. 2 is an explanatory diagram showing an example of conventional processing, FIG. 3 is an overall configuration diagram of a projection calculation device according to an embodiment of the present invention, and FIG. 4 is a mock diagram for explaining the operation, and FIG. 6 is a timing diagram of the projection operation on the horizontal axis. 1... ADffi converter, 2... Counter, 3... DMA transfer control means, 4...
... Computer main = self-memory means, 6 ... Adder, 6.
... Temporary storage means 7 ... Overall operation control,
8... Serial/parallel conversion buffer memory. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3j

Claims (1)

[Claims] An AD converter that binarizes the video signal, a counter that counts the data of one horizontal scan of the binarized video signal, a temporary storage unit that stores cumulative data in the vertical direction of the screen, and reading from the temporary storage unit. A projection calculation device comprising an adder that adds data and a current video signal, and a DMA transfer control that transfers the contents of the counter and temporary storage means to main storage means.