Canon Kabushiki Kaisha

Shoji Ichimasa

Yukio Odaka

Masahiro Kawarada

Masayuki Abe

Takanori Kodaira

Yoshiaki Honda

Hiroyuki Hase

The liquid crystal drive apparatus drives a liquid crystal element. The apparatus includes an image data producer producing, using each of multiple input frame image data continuously input thereto, first frame image data and second frame image data, and a driver sequentially controlling, depending on the first frame image data and the second frame image data, application of a first voltage or a second voltage lower than the first voltage to each of multiple pixels of the liquid crystal element in respective multiple sub-frame periods included in one frame period to cause that pixel to form a tone. Pixel data at pixel positions corresponding to each other in the first and second frame image data have mutually different tones. A tone difference between the mutually different tones is 20% or less of a higher one of the mutually different tones.

Liquid crystal drive apparatus, image display apparatus capable of reducing degradation in image quality due to disclination, and storage medium storing liquid crystal drive program capable thereof

The electrooptical display apparatus includes pixels, and scan lines and data lines arranged in a matrix. The apparatus further includes pixel switching elements each enabling, in response to application of a selection voltage to one scan line, application of a pixel voltage to one pixel in a pixel row corresponding to the one scan line through one data line, a voltage producing part producing a sampling voltage that is to be supplied to the data lines and that monotonously changes while the selection voltage is applied to the scan line, a voltage sampling part sampling the pixel voltage from the sampling voltage, a sampling number detecting part detecting number of pixels for which a same voltage is sampled, and a controller lowering a frequency of sampling of the pixel voltage when the detected number is a predetermined number.

Electrooptical display apparatus that performs voltage sampling outside of a noise settling period, and electronic device

When images are projected in a superposing manner on a screen by a plurality of projectors, a controller of a projector obtains drive timing information of liquid crystal panels of the plurality of projectors and controls a drive timing of a drive unit on the basis of the obtained drive timing information so as to reduce a flicker of a display image.

Projector, projector control method, and projection system

Object recognition is executed by using, of feature data classified into a plurality of groups, only feature data belonging to a selected group. Hence, it is unnecessary to compare and refer to all feature data so that object recognition processing can be speeded up.

Image processing apparatus and image processing method, and computer program for causing computer to execute control method of image processing apparatus

A display control apparatus to drive a display panel to display an image and a control method of the display device. It is determined whether or not a number of different bits in a plurality of bits of display image signals that are to be continuously converted into analog signals are different from each other is equal to or more than a predetermined value. If it is determined that the number of different bits is equal to or more than the predetermined value, then the display image signal is modified so that the display panel is driven based on an analog signal converted from the modified display signal to display an image.

Display control apparatus and method of controlling the display control device

This invention makes it possible to execute photography with a sufficient red-eye relaxation effect. To do this, in this invention, the amount of a red eye is detected on the basis of a signal obtained by reading an object image under light projection by a light projection unit. The light projection by the light projection unit is controlled on the basis of the detection result.

Image sensing apparatus and control method for relaxing red-eye effect in sensed image data

The present invention provides a flash discharging circuit for simplifying the charging of electric power in a capacitor. When energy discharged from a transformer for storing and discharging energy is charged in a main capacitor of the circuit, a detection voltage inputted to a first input terminal of a comparator so as to detect a primary current flowing through a primary winding of the transformer is compared with a reference voltage inputted to a second input terminal of the comparator. According to a result of the comparison, it is detected that a predetermined primary current flows through the primary winding of the transformer. When the primary current flowing through the primary winding of the transformer is turned off, the reference voltage is set to be lower than the detection voltage.

Capacitor charging circuit, flash unit, and camera

Image sensing apparatus, image processing apparatus, and control method therefor for relaxing a red-eye effect

A strobe device including a light-emitting tube, a main capacitor which accumulates energy and which supplies the energy to the light-emitting tube, a transformer circuit which includes primary and secondary coils in order to accumulate the energy of a power supply in the main capacitor, wherein the primary coil is connected to the power supply and the secondary coil is connected to the main capacitor, a control circuit which controls a current flowing from the power supply to the primary coil, wherein a current starts to flow through the secondary coil after the control circuit stops a current flowing through the primary coil, and a determination circuit which determines that a malfunction has occurred in accordance with a current flowing through the secondary coil.

Capacitor strobe charging device utilizing current detection to determine malfunction, and strobe and camera using same

Strobe charge apparatus

A strobe charging device includes a light-emitting tube; a main capacitor for accumulating energy and for supplying the energy to the light-emitting tube; a transformer circuit which includes primary and secondary coils in order to accumulate the energy of a power supply in the main capacitor; a control circuit for controlling a current flowing from the power supply to the primary coil; a current detection circuit for detecting a current flowing through the secondary coil; a time measuring circuit for measuring the time from when the control circuit stops a current flowing through the primary coil until the current detection circuit detects that the current flowing through the secondary coil reaches a predetermined level or until the current flowing through the secondary coil stops; a voltage detecting circuit for detecting the voltage of the main capacitor; and a determination circuit for determining the operation state of the device based on the measurement result generated by the time measuring circuit and on a voltage detected by the voltage detecting circuit.

Capacitor charging device utilizing current detection to determine malfunction, and strobe and camera using same

The present invention provides an electronic flash device, and in particular, an electronic flash device including forward and flyback type booster circuits. The two booster circuits are appropriately switched depending on the charged state of a capacitor of the electronic flash device or the operative state of the camera, thereby achieving proper charging time and charging efficiency.

Electronic flash device

In a flash apparatus, when it is determined that the oscillation of a voltage boosting circuit is stopped before it is controlled so as to stop, it is possible to continuously charge a voltage to a main capacitor by causing the voltage boosting circuit to continue oscillation by providing a control circuit for oscillating the voltage boosting circuit again. Further, the flash apparatus includes a charged current detecting circuit for detecting the current charged in a main capacitor using an auxiliary power source as a power source. The charged current detecting circuit is simply arranged with a passive element for bypassing a part of the current charged in the main capacitor from a loop through the above-mentioned auxiliary power source.

Growing community of inventors

Kanagawa, Japan

Shoji Ichimasa